move on to version 0.13.0

Currently translated at 89.8% (318 of 354 strings)

README.md

@@ -59,18 +59,17 @@ NewPipe does not use any Google framework libraries, or the YouTube API. It only
 * Search/Watch Playlists
 * Watch as queues Playlists
 * Queuing videos
+* Local playlists
+* Subtitles
+* Multi-service support (eg. SoundCloud in NewPipe Beta)
 
 ### Coming Features
 
-* Multiservice support (eg. SoundCloud)
-* Bookmarks
-* Subtitles support
-* livestream support
+* Livestream support
+* Cast to UPnP and Cast
+* Show comments
 * ... and many more
 
-### Multiservice support
-Although NewPipe only supports YouTube at the moment, it's designed to support many more streaming services. The plan is, that NewPipe will get such support by the version 2.0.
-
 ## Contribution
 Whether you have ideas, translations, design changes, code cleaning, or real heavy code changes, help is always welcome.
 The more is done the better it gets!
@@ -78,19 +77,24 @@ The more is done the better it gets!
 If you'd like to get involved, check our [contribution notes](.github/CONTRIBUTING.md).
 
 ## Donate
-If you like NewPipe we'd be happy about a donation. You can either donate via Bitcoin or BountySource. For further information about donating to NewPipe, please visit our [website](https://newpipe.schabi.org/donate/).
+If you like NewPipe we'd be happy about a donation. You can either donate via Bitcoin, Bountysource or Liberapay. For further information about donating to NewPipe, please visit our [website](https://newpipe.schabi.org/donate).
 
 <table>
-<tr>
-<td><img src="https://bitcoin.org/img/icons/logotop.svg" alt="Bitcoin" /></td>
-<td><img src="assets/bitcoin_qr_code.png" alt="Bitcoin QR Code" width="100px"/></td>
-<td><samp>16A9J59ahMRqkLSZjhYj33n9j3fMztFxnh</samp></td>
-</tr>
-<tr>
-<td><a href="https://www.bountysource.com/teams/newpipe"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Bountysource.png/320px-Bountysource.png" alz="Bountysource" width="190px" /></a></td>
-<td><a href="https://www.bountysource.com/teams/newpipe"><img src="assets/bountysource_qr_code.png" alt="Visit NewPipe at bountysource.com" width="100px"/></a></td>
-<td><a href="https://www.bountysource.com/teams/newpipe/issues"><img src="https://img.shields.io/bountysource/team/newpipe/activity.svg?colorB=cd201f" height="30px" alt="Check out how many bounties you can earn." /></a></td>
-</tr>
+  <tr>
+    <td><img src="https://bitcoin.org/img/icons/logotop.svg" alt="Bitcoin" /></td>
+    <td><img src="assets/bitcoin_qr_code.png" alt="Bitcoin QR Code" width="100px"/></td>
+    <td><samp>16A9J59ahMRqkLSZjhYj33n9j3fMztFxnh</samp></td>
+  </tr>
+  <tr>
+    <td><a href="https://liberapay.com/TeamNewPipe/"><img src="https://upload.wikimedia.org/wikipedia/commons/2/27/Liberapay_logo_v2_white-on-yellow.svg" alt="Liberapay" width="80px" /></a></td>
+    <td><a href="https://liberapay.com/TeamNewPipe/"><img src="assets/liberapay_qr_code.png" alt="Visit NewPipe at liberapay.com" width="100px"/></a></td>
+    <td><a href="https://liberapay.com/TeamNewPipe/donate/"><img src="assets/liberapay_donate_button.svg" alt="Donate via Liberapay" height="35px" /></a></td>
+  </tr>
+  <tr>
+    <td><a href="https://www.bountysource.com/teams/newpipe"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Bountysource.png/320px-Bountysource.png" alt="Bountysource" width="190px" /></a></td>
+    <td><a href="https://www.bountysource.com/teams/newpipe"><img src="assets/bountysource_qr_code.png" alt="Visit NewPipe at bountysource.com" width="100px"/></a></td>
+    <td><a href="https://www.bountysource.com/teams/newpipe/issues"><img src="https://img.shields.io/bountysource/team/newpipe/activity.svg?colorB=cd201f" height="30px" alt="Check out how many bounties you can earn." /></a></td>
+  </tr>
 </table>
 
 ## License

app/build.gradle

@@ -8,8 +8,8 @@ android {
         applicationId "org.schabi.newpipe"
         minSdkVersion 15
         targetSdkVersion 27
-        versionCode 48
-        versionName "0.12.0"
+        versionCode 49
+        versionName "0.13.0"
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
@@ -48,14 +48,20 @@ android {
 }
 
 ext {
-    supportLibVersion = '27.0.2'
+    supportLibVersion = '27.1.0'
+    exoPlayerLibVersion = '2.7.1'
+    roomDbLibVersion = '1.0.0'
+    leakCanaryLibVersion = '1.5.4'
+    okHttpLibVersion = '1.5.0'
+    icepickLibVersion = '3.2.0'
+    stethoLibVersion = '1.5.0'
 }
 dependencies {
     androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2') {
         exclude module: 'support-annotations'
     }
 
-    implementation 'com.github.TeamNewPipe:NewPipeExtractor:7716b1437815'
+    implementation 'com.github.TeamNewPipe:NewPipeExtractor:f787b375e5fb6d'
 
     testImplementation 'junit:junit:4.12'
     testImplementation 'org.mockito:mockito-core:1.10.19'
@@ -72,28 +78,29 @@ dependencies {
     implementation 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
     implementation 'de.hdodenhof:circleimageview:2.2.0'
     implementation 'com.github.nirhart:ParallaxScroll:dd53d1f9d1'
-    implementation 'com.nononsenseapps:filepicker:3.0.1'
-    implementation 'com.google.android.exoplayer:exoplayer:2.6.0'
+    implementation 'com.nononsenseapps:filepicker:4.2.1'
+    implementation "com.google.android.exoplayer:exoplayer:$exoPlayerLibVersion"
+    implementation "com.google.android.exoplayer:extension-mediasession:$exoPlayerLibVersion"
 
-    debugImplementation 'com.facebook.stetho:stetho:1.5.0'
-    debugImplementation 'com.facebook.stetho:stetho-urlconnection:1.5.0'
-    debugImplementation 'com.android.support:multidex:1.0.2'
+    debugImplementation "com.facebook.stetho:stetho:$stethoLibVersion"
+    debugImplementation "com.facebook.stetho:stetho-urlconnection:$stethoLibVersion"
+    debugImplementation 'com.android.support:multidex:1.0.3'
 
-    implementation 'io.reactivex.rxjava2:rxjava:2.1.7'
-    implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
-    implementation 'com.jakewharton.rxbinding2:rxbinding:2.0.0'
+    implementation 'io.reactivex.rxjava2:rxjava:2.1.10'
+    implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
+    implementation 'com.jakewharton.rxbinding2:rxbinding:2.1.1'
 
-    implementation 'android.arch.persistence.room:runtime:1.0.0'
-    implementation 'android.arch.persistence.room:rxjava2:1.0.0'
-    annotationProcessor 'android.arch.persistence.room:compiler:1.0.0'
+    implementation "android.arch.persistence.room:runtime:$roomDbLibVersion"
+    implementation "android.arch.persistence.room:rxjava2:$roomDbLibVersion"
+    annotationProcessor "android.arch.persistence.room:compiler:$roomDbLibVersion"
 
-    implementation 'frankiesardo:icepick:3.2.0'
-    annotationProcessor 'frankiesardo:icepick-processor:3.2.0'
+    implementation "frankiesardo:icepick:$icepickLibVersion"
+    annotationProcessor "frankiesardo:icepick-processor:$icepickLibVersion"
 
-    debugImplementation 'com.squareup.leakcanary:leakcanary-android:1.5.4'
-    betaImplementation 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.4'
-    releaseImplementation 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.4'
+    debugImplementation "com.squareup.leakcanary:leakcanary-android:$leakCanaryLibVersion"
+    betaImplementation "com.squareup.leakcanary:leakcanary-android-no-op:$leakCanaryLibVersion"
+    releaseImplementation "com.squareup.leakcanary:leakcanary-android-no-op:$leakCanaryLibVersion"
 
     implementation 'com.squareup.okhttp3:okhttp:3.9.1'
-    debugImplementation 'com.facebook.stetho:stetho-okhttp3:1.5.0'
+    debugImplementation "com.facebook.stetho:stetho-okhttp3:$okHttpLibVersion"
 }

app/src/main/AndroidManifest.xml

@@ -28,6 +28,12 @@
             </intent-filter>
         </activity>
 
+        <receiver android:name="android.support.v4.media.session.MediaButtonReceiver" >
+            <intent-filter>
+                <action android:name="android.intent.action.MEDIA_BUTTON" />
+            </intent-filter>
+        </receiver>
+
         <activity
             android:name=".player.old.PlayVideoActivity"
             android:configChanges="orientation|keyboardHidden|screenSize"
@@ -70,6 +76,9 @@
             android:name=".history.HistoryActivity"
             android:label="@string/title_activity_history"/>
 
+        <service android:name=".subscription.services.SubscriptionsImportService"/>
+        <service android:name=".subscription.services.SubscriptionsExportService"/>
+
         <activity
             android:name=".PanicResponderActivity"
             android:launchMode="singleInstance"
@@ -117,7 +126,7 @@
             android:grantUriPermissions="true">
             <meta-data
                 android:name="android.support.FILE_PROVIDER_PATHS"
-                android:resource="@xml/provider_paths"/>
+                android:resource="@xml/nnf_provider_paths"/>
         </provider>
 
         <activity

app/src/main/java/org/schabi/newpipe/App.java

@@ -89,7 +89,6 @@ public class App extends Application {
         SettingsActivity.initSettings(this);
 
         NewPipe.init(getDownloader());
-        NewPipeDatabase.init(this);
         StateSaver.init(this);
         initNotificationChannel();
 
@@ -168,6 +167,7 @@ public class App extends Application {
         return new ImageLoaderConfiguration.Builder(this)
                 .memoryCache(new LRULimitedMemoryCache(memoryCacheSizeMb * 1024 * 1024))
                 .diskCacheSize(diskCacheSizeMb * 1024 * 1024)
+                .imageDownloader(new ImageDownloader(getApplicationContext()))
                 .build();
     }
 

app/src/main/java/org/schabi/newpipe/BaseFragment.java

@@ -1,18 +1,14 @@
 package org.schabi.newpipe;
 
 import android.content.Context;
-import android.content.res.TypedArray;
 import android.os.Bundle;
-import android.support.annotation.AttrRes;
 import android.support.annotation.NonNull;
 import android.support.v4.app.Fragment;
 import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
 import android.view.View;
 
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
 import com.nostra13.universalimageloader.core.ImageLoader;
-import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
 import com.squareup.leakcanary.RefWatcher;
 
 import icepick.Icepick;
@@ -87,33 +83,13 @@ public abstract class BaseFragment extends Fragment {
     }
 
     /*//////////////////////////////////////////////////////////////////////////
-    // DisplayImageOptions default configurations
+    // Utils
     //////////////////////////////////////////////////////////////////////////*/
 
-    public static final DisplayImageOptions BASE_OPTIONS =
-            new DisplayImageOptions.Builder().cacheInMemory(true).build();
-
-    public static final DisplayImageOptions DISPLAY_AVATAR_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cloneFrom(BASE_OPTIONS)
-                    .showImageOnLoading(R.drawable.buddy)
-                    .showImageForEmptyUri(R.drawable.buddy)
-                    .showImageOnFail(R.drawable.buddy)
-                    .build();
-
-    public static final DisplayImageOptions DISPLAY_THUMBNAIL_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cloneFrom(BASE_OPTIONS)
-                    .displayer(new FadeInBitmapDisplayer(250))
-                    .showImageForEmptyUri(R.drawable.dummy_thumbnail)
-                    .showImageOnFail(R.drawable.dummy_thumbnail)
-                    .build();
-
-    public static final DisplayImageOptions DISPLAY_BANNER_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cloneFrom(BASE_OPTIONS)
-                    .showImageOnLoading(R.drawable.channel_banner)
-                    .showImageForEmptyUri(R.drawable.channel_banner)
-                    .showImageOnFail(R.drawable.channel_banner)
-                    .build();
+    public void setTitle(String title) {
+        if (DEBUG) Log.d(TAG, "setTitle() called with: title = [" + title + "]");
+        if (activity != null && activity.getSupportActionBar() != null) {
+            activity.getSupportActionBar().setTitle(title);
+        }
+    }
 }

app/src/main/java/org/schabi/newpipe/Downloader.java

@@ -6,6 +6,7 @@ import android.text.TextUtils;
 import org.schabi.newpipe.extractor.exceptions.ReCaptchaException;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
@@ -98,6 +99,18 @@ public class Downloader implements org.schabi.newpipe.extractor.Downloader {
      */
     @Override
     public String download(String siteUrl, Map<String, String> customProperties) throws IOException, ReCaptchaException {
+        return getBody(siteUrl, customProperties).string();
+    }
+
+    public InputStream stream(String siteUrl) throws IOException {
+        try {
+            return getBody(siteUrl, Collections.emptyMap()).byteStream();
+        } catch (ReCaptchaException e) {
+            throw new IOException(e.getMessage(), e.getCause());
+        }
+    }
+
+    private ResponseBody getBody(String siteUrl, Map<String, String> customProperties) throws IOException, ReCaptchaException {
         final Request.Builder requestBuilder = new Request.Builder()
                 .method("GET", null).url(siteUrl)
                 .addHeader("User-Agent", USER_AGENT);
@@ -123,7 +136,7 @@ public class Downloader implements org.schabi.newpipe.extractor.Downloader {
             return null;
         }
 
-        return body.string();
+        return body;
     }
 
     /**

app/src/main/java/org/schabi/newpipe/ImageDownloader.java

@@ -0,0 +1,46 @@
+package org.schabi.newpipe;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Resources;
+import android.preference.PreferenceManager;
+
+import com.nostra13.universalimageloader.core.download.BaseImageDownloader;
+
+import org.schabi.newpipe.extractor.NewPipe;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class ImageDownloader extends BaseImageDownloader {
+    private final Resources resources;
+    private final SharedPreferences preferences;
+    private final String downloadThumbnailKey;
+
+    public ImageDownloader(Context context) {
+        super(context);
+        this.resources = context.getResources();
+        this.preferences = PreferenceManager.getDefaultSharedPreferences(context);
+        this.downloadThumbnailKey = context.getString(R.string.download_thumbnail_key);
+    }
+
+    private boolean isDownloadingThumbnail() {
+        return preferences.getBoolean(downloadThumbnailKey, true);
+    }
+
+    @SuppressLint("ResourceType")
+    @Override
+    public InputStream getStream(String imageUri, Object extra) throws IOException {
+        if (isDownloadingThumbnail()) {
+            return super.getStream(imageUri, extra);
+        } else {
+            return resources.openRawResource(R.drawable.dummy_thumbnail_dark);
+        }
+    }
+
+    protected InputStream getStreamFromNetwork(String imageUri, Object extra) throws IOException {
+        final Downloader downloader = (Downloader) NewPipe.getDownloader();
+        return downloader.stream(imageUri);
+    }
+}

app/src/main/java/org/schabi/newpipe/MainActivity.java

@@ -176,9 +176,11 @@ public class MainActivity extends AppCompatActivity {
         // when the user returns to MainActivity
         drawer.closeDrawer(Gravity.START, false);
         try {
-            String selectedServiceName = NewPipe.getService(
-                    ServiceHelper.getSelectedServiceId(this)).getServiceInfo().getName();
-            headerServiceView.setText(selectedServiceName);
+            if(BuildConfig.BUILD_TYPE != "release" ) {
+                String selectedServiceName = NewPipe.getService(
+                        ServiceHelper.getSelectedServiceId(this)).getServiceInfo().getName();
+                headerServiceView.setText(selectedServiceName);
+            }
         } catch (Exception e) {
             ErrorActivity.reportUiError(this, e);
         }

app/src/main/java/org/schabi/newpipe/NewPipeDatabase.java

@@ -11,31 +11,32 @@ import static org.schabi.newpipe.database.Migrations.MIGRATION_11_12;
 
 public final class NewPipeDatabase {
 
-    private static AppDatabase databaseInstance;
+    private static volatile AppDatabase databaseInstance;
 
     private NewPipeDatabase() {
         //no instance
     }
 
-    public static void init(Context context) {
-        databaseInstance = Room
-                .databaseBuilder(context, AppDatabase.class, DATABASE_NAME)
+    private static AppDatabase getDatabase(Context context) {
+        return Room
+                .databaseBuilder(context.getApplicationContext(), AppDatabase.class, DATABASE_NAME)
                 .addMigrations(MIGRATION_11_12)
                 .fallbackToDestructiveMigration()
                 .build();
     }
 
     @NonNull
-    @Deprecated
-    public static AppDatabase getInstance() {
-        if (databaseInstance == null) throw new RuntimeException("Database not initialized");
+    public static AppDatabase getInstance(@NonNull Context context) {
+        AppDatabase result = databaseInstance;
+        if (result == null) {
+            synchronized (NewPipeDatabase.class) {
+                result = databaseInstance;
+                if (result == null) {
+                    databaseInstance = (result = getDatabase(context));
+                }
+            }
+        }
 
-        return databaseInstance;
-    }
-
-    @NonNull
-    public static AppDatabase getInstance(Context context) {
-        if (databaseInstance == null) init(context);
-        return databaseInstance;
+        return result;
     }
 }

app/src/main/java/org/schabi/newpipe/database/stream/model/StreamEntity.java

@@ -71,14 +71,14 @@ public class StreamEntity implements Serializable {
 
     @Ignore
     public StreamEntity(final StreamInfoItem item) {
-        this(item.service_id, item.name, item.url, item.stream_type, item.thumbnail_url,
-                item.uploader_name, item.duration);
+        this(item.getServiceId(), item.getName(), item.getUrl(), item.getStreamType(), item.getThumbnailUrl(),
+                item.getUploaderName(), item.getDuration());
     }
 
     @Ignore
     public StreamEntity(final StreamInfo info) {
-        this(info.service_id, info.name, info.url, info.stream_type, info.thumbnail_url,
-                info.uploader_name, info.duration);
+        this(info.getServiceId(), info.getName(), info.getUrl(), info.getStreamType(), info.getThumbnailUrl(),
+                info.getUploaderName(), info.getDuration());
     }
 
     @Ignore

app/src/main/java/org/schabi/newpipe/database/subscription/SubscriptionDAO.java

@@ -1,7 +1,10 @@
 package org.schabi.newpipe.database.subscription;
 
 import android.arch.persistence.room.Dao;
+import android.arch.persistence.room.Insert;
+import android.arch.persistence.room.OnConflictStrategy;
 import android.arch.persistence.room.Query;
+import android.arch.persistence.room.Transaction;
 
 import org.schabi.newpipe.database.BasicDAO;
 
@@ -11,24 +14,56 @@ import io.reactivex.Flowable;
 
 import static org.schabi.newpipe.database.subscription.SubscriptionEntity.SUBSCRIPTION_SERVICE_ID;
 import static org.schabi.newpipe.database.subscription.SubscriptionEntity.SUBSCRIPTION_TABLE;
+import static org.schabi.newpipe.database.subscription.SubscriptionEntity.SUBSCRIPTION_UID;
 import static org.schabi.newpipe.database.subscription.SubscriptionEntity.SUBSCRIPTION_URL;
 
 @Dao
-public interface SubscriptionDAO extends BasicDAO<SubscriptionEntity> {
+public abstract class SubscriptionDAO implements BasicDAO<SubscriptionEntity> {
     @Override
     @Query("SELECT * FROM " + SUBSCRIPTION_TABLE)
-    Flowable<List<SubscriptionEntity>> getAll();
+    public abstract Flowable<List<SubscriptionEntity>> getAll();
 
     @Override
     @Query("DELETE FROM " + SUBSCRIPTION_TABLE)
-    int deleteAll();
+    public abstract int deleteAll();
 
     @Override
     @Query("SELECT * FROM " + SUBSCRIPTION_TABLE + " WHERE " + SUBSCRIPTION_SERVICE_ID + " = :serviceId")
-    Flowable<List<SubscriptionEntity>> listByService(int serviceId);
+    public abstract Flowable<List<SubscriptionEntity>> listByService(int serviceId);
 
     @Query("SELECT * FROM " + SUBSCRIPTION_TABLE + " WHERE " +
             SUBSCRIPTION_URL + " LIKE :url AND " +
             SUBSCRIPTION_SERVICE_ID + " = :serviceId")
-    Flowable<List<SubscriptionEntity>> getSubscription(int serviceId, String url);
+    public abstract Flowable<List<SubscriptionEntity>> getSubscription(int serviceId, String url);
+
+    @Query("SELECT " + SUBSCRIPTION_UID + " FROM " + SUBSCRIPTION_TABLE + " WHERE " +
+            SUBSCRIPTION_URL + " LIKE :url AND " +
+            SUBSCRIPTION_SERVICE_ID + " = :serviceId")
+    abstract Long getSubscriptionIdInternal(int serviceId, String url);
+
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    abstract Long insertInternal(final SubscriptionEntity entities);
+
+    @Transaction
+    public List<SubscriptionEntity> upsertAll(List<SubscriptionEntity> entities) {
+        for (SubscriptionEntity entity : entities) {
+            Long uid = insertInternal(entity);
+
+            if (uid != -1) {
+                entity.setUid(uid);
+                continue;
+            }
+
+            uid = getSubscriptionIdInternal(entity.getServiceId(), entity.getUrl());
+            entity.setUid(uid);
+
+            if (uid == -1) {
+                throw new IllegalStateException("Invalid subscription id (-1)");
+            }
+
+            update(entity);
+        }
+
+        return entities;
+    }
 }

app/src/main/java/org/schabi/newpipe/database/subscription/SubscriptionEntity.java

@@ -5,7 +5,9 @@ import android.arch.persistence.room.Entity;
 import android.arch.persistence.room.Ignore;
 import android.arch.persistence.room.Index;
 import android.arch.persistence.room.PrimaryKey;
+import android.support.annotation.NonNull;
 
+import org.schabi.newpipe.extractor.channel.ChannelInfo;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.util.Constants;
 
@@ -17,6 +19,7 @@ import static org.schabi.newpipe.database.subscription.SubscriptionEntity.SUBSCR
         indices = {@Index(value = {SUBSCRIPTION_SERVICE_ID, SUBSCRIPTION_URL}, unique = true)})
 public class SubscriptionEntity {
 
+    final static String SUBSCRIPTION_UID                = "uid";
     final static String SUBSCRIPTION_TABLE              = "subscriptions";
     final static String SUBSCRIPTION_SERVICE_ID         = "service_id";
     final static String SUBSCRIPTION_URL                = "url";
@@ -116,9 +119,18 @@ public class SubscriptionEntity {
     @Ignore
     public ChannelInfoItem toChannelInfoItem() {
         ChannelInfoItem item = new ChannelInfoItem(getServiceId(), getUrl(), getName());
-        item.thumbnail_url = getAvatarUrl();
-        item.subscriber_count = getSubscriberCount();
-        item.description = getDescription();
+        item.setThumbnailUrl(getAvatarUrl());
+        item.setSubscriberCount(getSubscriberCount());
+        item.setDescription(getDescription());
         return item;
     }
+
+    @Ignore
+    public static SubscriptionEntity from(@NonNull ChannelInfo info) {
+        SubscriptionEntity result = new SubscriptionEntity();
+        result.setServiceId(info.getServiceId());
+        result.setUrl(info.getUrl());
+        result.setData(info.getName(), info.getAvatarUrl(), info.getDescription(), info.getSubscriberCount());
+        return result;
+    }
 }

app/src/main/java/org/schabi/newpipe/download/DownloadDialog.java

@@ -205,7 +205,7 @@ public class DownloadDialog extends DialogFragment implements RadioGroup.OnCheck
         if (DEBUG) Log.d(TAG, "onCheckedChanged() called with: group = [" + group + "], checkedId = [" + checkedId + "]");
         switch (checkedId) {
             case R.id.audio_button:
-                setupAudioSpinner(currentInfo.audio_streams, streamsSpinner);
+                setupAudioSpinner(currentInfo.getAudioStreams(), streamsSpinner);
                 break;
             case R.id.video_button:
                 setupVideoSpinner(sortedStreamVideosList, streamsSpinner);

app/src/main/java/org/schabi/newpipe/fragments/BaseStateFragment.java

@@ -246,13 +246,6 @@ public abstract class BaseStateFragment<I> extends BaseFragment implements ViewC
     // Utils
     //////////////////////////////////////////////////////////////////////////*/
 
-    public void setTitle(String title) {
-        if (DEBUG) Log.d(TAG, "setTitle() called with: title = [" + title + "]");
-        if (activity != null && activity.getSupportActionBar() != null) {
-            activity.getSupportActionBar().setTitle(title);
-        }
-    }
-
     protected void openUrlInBrowser(String url) {
         Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
         startActivity(Intent.createChooser(intent, activity.getString(R.string.share_dialog_title)));

app/src/main/java/org/schabi/newpipe/fragments/MainFragment.java

@@ -106,7 +106,7 @@ public class MainFragment extends BaseFragment implements TabLayout.OnTabSelecte
         super.onCreateOptionsMenu(menu, inflater);
         if (DEBUG) Log.d(TAG, "onCreateOptionsMenu() called with: menu = [" + menu + "], inflater = [" + inflater + "]");
         inflater.inflate(R.menu.main_fragment_menu, menu);
-        SubMenu kioskMenu = menu.addSubMenu(getString(R.string.kiosk));
+        SubMenu kioskMenu = menu.addSubMenu(Menu.NONE, Menu.NONE, 200, getString(R.string.kiosk));
         try {
             createKioskMenu(kioskMenu, inflater);
         } catch (Exception e) {

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java

@@ -43,6 +43,7 @@ import android.widget.Toast;
 
 import com.nirhart.parallaxscroll.views.ParallaxScrollView;
 import com.nostra13.universalimageloader.core.assist.FailReason;
+import com.nostra13.universalimageloader.core.listener.ImageLoadingListener;
 import com.nostra13.universalimageloader.core.listener.SimpleImageLoadingListener;
 
 import org.schabi.newpipe.R;
@@ -56,6 +57,7 @@ import org.schabi.newpipe.extractor.services.youtube.YoutubeStreamExtractor;
 import org.schabi.newpipe.extractor.stream.AudioStream;
 import org.schabi.newpipe.extractor.stream.StreamInfo;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
+import org.schabi.newpipe.extractor.stream.StreamType;
 import org.schabi.newpipe.extractor.stream.VideoStream;
 import org.schabi.newpipe.fragments.BackPressable;
 import org.schabi.newpipe.fragments.BaseStateFragment;
@@ -72,6 +74,7 @@ import org.schabi.newpipe.report.ErrorActivity;
 import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.util.Constants;
 import org.schabi.newpipe.util.ExtractorHelper;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.InfoCache;
 import org.schabi.newpipe.util.ListHelper;
 import org.schabi.newpipe.util.Localization;
@@ -90,8 +93,6 @@ import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.CompositeDisposable;
 import io.reactivex.disposables.Disposable;
-import io.reactivex.functions.Consumer;
-import io.reactivex.functions.Function;
 import io.reactivex.schedulers.Schedulers;
 
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
@@ -136,6 +137,7 @@ public class VideoDetailFragment
     /*//////////////////////////////////////////////////////////////////////////
     // Views
     //////////////////////////////////////////////////////////////////////////*/
+
     private Menu menu;
 
     private Spinner spinnerToolbar;
@@ -157,6 +159,7 @@ public class VideoDetailFragment
     private TextView detailControlsAddToPlaylist;
     private TextView detailControlsDownload;
     private TextView appendControlsDetail;
+    private TextView detailDurationView;
 
     private LinearLayout videoDescriptionRootLayout;
     private TextView videoUploadDateView;
@@ -321,7 +324,7 @@ public class VideoDetailFragment
         if (serializable instanceof StreamInfo) {
             //noinspection unchecked
             currentInfo = (StreamInfo) serializable;
-            InfoCache.getInstance().putInfo(currentInfo);
+            InfoCache.getInstance().putInfo(serviceId, url, currentInfo);
         }
 
         serializable = savedState.getSerializable(STACK_KEY);
@@ -382,7 +385,8 @@ public class VideoDetailFragment
                 }
                 break;
             case R.id.detail_thumbnail_root_layout:
-                if (currentInfo.video_streams.isEmpty() && currentInfo.video_only_streams.isEmpty()) {
+                if (currentInfo.getVideoStreams().isEmpty()
+                        && currentInfo.getVideoOnlyStreams().isEmpty()) {
                     openBackgroundPlayer(false);
                 } else {
                     openVideoPlayer();
@@ -458,7 +462,6 @@ public class VideoDetailFragment
     @Override
     protected void initViews(View rootView, Bundle savedInstanceState) {
         super.initViews(rootView, savedInstanceState);
-
         spinnerToolbar = activity.findViewById(R.id.toolbar).findViewById(R.id.toolbar_spinner);
 
         parallaxScrollRootView = rootView.findViewById(R.id.detail_main_content);
@@ -479,6 +482,7 @@ public class VideoDetailFragment
         detailControlsAddToPlaylist = rootView.findViewById(R.id.detail_controls_playlist_append);
         detailControlsDownload = rootView.findViewById(R.id.detail_controls_download);
         appendControlsDetail = rootView.findViewById(R.id.touch_append_detail);
+        detailDurationView = rootView.findViewById(R.id.detail_duration_view);
 
         videoDescriptionRootLayout = rootView.findViewById(R.id.detail_description_root_layout);
         videoUploadDateView = rootView.findViewById(R.id.detail_upload_date_view);
@@ -579,30 +583,25 @@ public class VideoDetailFragment
         };
     }
 
-    private void initThumbnailViews(StreamInfo info) {
+    private void initThumbnailViews(@NonNull StreamInfo info) {
         thumbnailImageView.setImageResource(R.drawable.dummy_thumbnail_dark);
         if (!TextUtils.isEmpty(info.getThumbnailUrl())) {
-            imageLoader.displayImage(
-                    info.getThumbnailUrl(),
-                    thumbnailImageView,
-                    DISPLAY_THUMBNAIL_OPTIONS, new SimpleImageLoadingListener() {
+            final String infoServiceName = NewPipe.getNameOfService(info.getServiceId());
+            final ImageLoadingListener onFailListener = new SimpleImageLoadingListener() {
                 @Override
                 public void onLoadingFailed(String imageUri, View view, FailReason failReason) {
-                    ErrorActivity.reportError(
-                            activity,
-                            failReason.getCause(),
-                            null,
-                            activity.findViewById(android.R.id.content),
-                            ErrorActivity.ErrorInfo.make(UserAction.LOAD_IMAGE,
-                                    NewPipe.getNameOfService(currentInfo.getServiceId()),
-                                    imageUri,
-                                    R.string.could_not_load_thumbnails));
+                    showSnackBarError(failReason.getCause(), UserAction.LOAD_IMAGE,
+                            infoServiceName, imageUri, R.string.could_not_load_thumbnails);
                 }
-            });
+            };
+
+            imageLoader.displayImage(info.getThumbnailUrl(), thumbnailImageView,
+                    ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS, onFailListener);
         }
 
         if (!TextUtils.isEmpty(info.getUploaderAvatarUrl())) {
-            imageLoader.displayImage(info.getUploaderAvatarUrl(), uploaderThumb, DISPLAY_AVATAR_OPTIONS);
+            imageLoader.displayImage(info.getUploaderAvatarUrl(), uploaderThumb,
+                    ImageDisplayConstants.DISPLAY_AVATAR_OPTIONS);
         }
     }
 
@@ -617,7 +616,8 @@ public class VideoDetailFragment
             relatedStreamRootLayout.setVisibility(View.VISIBLE);
         } else nextStreamTitle.setVisibility(View.GONE);
 
-        if (info.related_streams != null && !info.related_streams.isEmpty() && showRelatedStreams) {
+        if (info.getRelatedStreams() != null
+                && !info.getRelatedStreams().isEmpty() && showRelatedStreams) {
             //long first = System.nanoTime(), each;
             int to = info.getRelatedStreams().size() >= INITIAL_RELATED_VIDEOS
                     ? INITIAL_RELATED_VIDEOS
@@ -682,7 +682,7 @@ public class VideoDetailFragment
         switch (id) {
             case R.id.menu_item_share: {
                 if(currentInfo != null) {
-                    shareUrl(currentInfo.name, url);
+                    shareUrl(currentInfo.getName(), url);
                 } else {
                     shareUrl(url, url);
                 }
@@ -1006,9 +1006,6 @@ public class VideoDetailFragment
         int height = isPortrait
                 ? (int) (metrics.widthPixels / (16.0f / 9.0f))
                 : (int) (metrics.heightPixels / 2f);
-        thumbnailImageView.setScaleType(isPortrait
-                ? ImageView.ScaleType.CENTER_CROP
-                : ImageView.ScaleType.FIT_CENTER);
         thumbnailImageView.setLayoutParams(
                 new FrameLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, height));
         thumbnailImageView.setMinimumHeight(height);
@@ -1094,6 +1091,7 @@ public class VideoDetailFragment
         animateView(contentRootLayoutHiding, false, 200);
         animateView(spinnerToolbar, false, 200);
         animateView(thumbnailPlayButton, false, 50);
+        animateView(detailDurationView, false, 100);
 
         videoTitleTextView.setText(name != null ? name : "");
         videoTitleTextView.setMaxLines(1);
@@ -1164,6 +1162,18 @@ public class VideoDetailFragment
             thumbsDisabledTextView.setVisibility(View.GONE);
         }
 
+        if (info.getDuration() > 0) {
+            detailDurationView.setText(Localization.getDurationString(info.getDuration()));
+            detailDurationView.setBackgroundColor(ContextCompat.getColor(activity, R.color.duration_background_color));
+            animateView(detailDurationView, true, 100);
+        } else if (info.getStreamType() == StreamType.LIVE_STREAM) {
+            detailDurationView.setText(R.string.duration_live);
+            detailDurationView.setBackgroundColor(ContextCompat.getColor(activity, R.color.live_duration_background_color));
+            animateView(detailDurationView, true, 100);
+        } else {
+            detailDurationView.setVisibility(View.GONE);
+        }
+
         videoTitleRoot.setClickable(true);
         videoTitleToggleArrow.setVisibility(View.VISIBLE);
         videoTitleToggleArrow.setImageResource(R.drawable.arrow_down);
@@ -1192,11 +1202,21 @@ public class VideoDetailFragment
                     0);
         }
 
-        if (info.video_streams.isEmpty() && info.video_only_streams.isEmpty()) {
-            detailControlsBackground.setVisibility(View.GONE);
-            detailControlsPopup.setVisibility(View.GONE);
-            spinnerToolbar.setVisibility(View.GONE);
-            thumbnailPlayButton.setImageResource(R.drawable.ic_headset_white_24dp);
+        switch (info.getStreamType()) {
+            case LIVE_STREAM:
+            case AUDIO_LIVE_STREAM:
+                detailControlsDownload.setVisibility(View.GONE);
+                spinnerToolbar.setVisibility(View.GONE);
+                break;
+            default:
+                if (!info.getVideoStreams().isEmpty()
+                        || !info.getVideoOnlyStreams().isEmpty()) break;
+
+                detailControlsBackground.setVisibility(View.GONE);
+                detailControlsPopup.setVisibility(View.GONE);
+                spinnerToolbar.setVisibility(View.GONE);
+                thumbnailPlayButton.setImageResource(R.drawable.ic_headset_white_24dp);
+                break;
         }
 
         if (autoPlayEnabled) {
@@ -1216,8 +1236,6 @@ public class VideoDetailFragment
 
         if (exception instanceof YoutubeStreamExtractor.GemaException) {
             onBlockedByGemaError();
-        } else if (exception instanceof YoutubeStreamExtractor.LiveStreamException) {
-            showError(getString(R.string.live_streams_not_supported), false);
         } else if (exception instanceof ContentNotAvailableException) {
             showError(getString(R.string.content_not_available), false);
         } else {

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListFragment.java

@@ -141,8 +141,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
             @Override
             public void selected(StreamInfoItem selectedItem) {
                 onItemSelected(selectedItem);
-                NavigationHelper.openVideoDetailFragment(
-                        useAsFrontPage?getParentFragment().getFragmentManager():getFragmentManager(),
+                NavigationHelper.openVideoDetailFragment(useAsFrontPage ? getParentFragment().getFragmentManager() : getFragmentManager(),
                         selectedItem.getServiceId(), selectedItem.getUrl(), selectedItem.getName());
             }
 
@@ -156,8 +155,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
             @Override
             public void selected(ChannelInfoItem selectedItem) {
                 onItemSelected(selectedItem);
-                NavigationHelper.openChannelFragment(
-                        useAsFrontPage?getParentFragment().getFragmentManager():getFragmentManager(),
+                NavigationHelper.openChannelFragment(useAsFrontPage ? getParentFragment().getFragmentManager() : getFragmentManager(),
                         selectedItem.getServiceId(), selectedItem.getUrl(), selectedItem.getName());
             }
         });
@@ -166,8 +164,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
             @Override
             public void selected(PlaylistInfoItem selectedItem) {
                 onItemSelected(selectedItem);
-                NavigationHelper.openPlaylistFragment(
-                        useAsFrontPage?getParentFragment().getFragmentManager():getFragmentManager(),
+                NavigationHelper.openPlaylistFragment(useAsFrontPage ? getParentFragment().getFragmentManager() : getFragmentManager(),
                         selectedItem.getServiceId(), selectedItem.getUrl(), selectedItem.getName());
             }
         });
@@ -230,7 +227,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
         ActionBar supportActionBar = activity.getSupportActionBar();
         if (supportActionBar != null) {
             supportActionBar.setDisplayShowTitleEnabled(true);
-            if(useAsFrontPage) {
+            if (useAsFrontPage) {
                 supportActionBar.setDisplayHomeAsUpEnabled(false);
             } else {
                 supportActionBar.setDisplayHomeAsUpEnabled(true);
@@ -277,9 +274,8 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
 
     @Override
     public void showListFooter(final boolean show) {
-        itemsList.post(new Runnable() {
-            @Override
-            public void run() {
+        itemsList.post(() -> {
+            if (infoListAdapter != null && itemsList != null) {
                 infoListAdapter.showFooter(show);
             }
         });

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListInfoFragment.java

@@ -19,7 +19,8 @@ import io.reactivex.disposables.Disposable;
 import io.reactivex.functions.Consumer;
 import io.reactivex.schedulers.Schedulers;
 
-public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListFragment<I, ListExtractor.NextItemsResult> {
+public abstract class BaseListInfoFragment<I extends ListInfo>
+        extends BaseListFragment<I, ListExtractor.InfoItemsPage> {
 
     @State
     protected int serviceId = Constants.NO_SERVICE_ID;
@@ -29,7 +30,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListF
     protected String url;
 
     protected I currentInfo;
-    protected String currentNextItemsUrl;
+    protected String currentNextPageUrl;
     protected Disposable currentWorker;
 
     @Override
@@ -73,7 +74,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListF
     public void writeTo(Queue<Object> objectsToSave) {
         super.writeTo(objectsToSave);
         objectsToSave.add(currentInfo);
-        objectsToSave.add(currentNextItemsUrl);
+        objectsToSave.add(currentNextPageUrl);
     }
 
     @Override
@@ -81,7 +82,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListF
     public void readFrom(@NonNull Queue<Object> savedObjects) throws Exception {
         super.readFrom(savedObjects);
         currentInfo = (I) savedObjects.poll();
-        currentNextItemsUrl = (String) savedObjects.poll();
+        currentNextPageUrl = (String) savedObjects.poll();
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -116,7 +117,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListF
                 .subscribe((@NonNull I result) -> {
                     isLoading.set(false);
                     currentInfo = result;
-                    currentNextItemsUrl = result.next_streams_url;
+                    currentNextPageUrl = result.getNextPageUrl();
                     handleResult(result);
                 }, (@NonNull Throwable throwable) -> onError(throwable));
     }
@@ -125,7 +126,7 @@ public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListF
      * Implement the logic to load more items<br/>
      * You can use the default implementations from {@link org.schabi.newpipe.util.ExtractorHelper}
      */
-    protected abstract Single<ListExtractor.NextItemsResult> loadMoreItemsLogic();
+    protected abstract Single<ListExtractor.InfoItemsPage> loadMoreItemsLogic();
 
     protected void loadMoreItems() {
         isLoading.set(true);
@@ -134,9 +135,9 @@ public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListF
         currentWorker = loadMoreItemsLogic()
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
-                .subscribe((@io.reactivex.annotations.NonNull ListExtractor.NextItemsResult nextItemsResult) -> {
+                .subscribe((@io.reactivex.annotations.NonNull ListExtractor.InfoItemsPage InfoItemsPage) -> {
                     isLoading.set(false);
-                    handleNextItems(nextItemsResult);
+                    handleNextItems(InfoItemsPage);
                 }, (@io.reactivex.annotations.NonNull Throwable throwable) -> {
                     isLoading.set(false);
                     onError(throwable);
@@ -144,17 +145,17 @@ public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListF
     }
 
     @Override
-    public void handleNextItems(ListExtractor.NextItemsResult result) {
+    public void handleNextItems(ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
-        currentNextItemsUrl = result.nextItemsUrl;
-        infoListAdapter.addInfoItemList(result.nextItemsList);
+        currentNextPageUrl = result.getNextPageUrl();
+        infoListAdapter.addInfoItemList(result.getItems());
 
         showListFooter(hasMoreItems());
     }
 
     @Override
     protected boolean hasMoreItems() {
-        return !TextUtils.isEmpty(currentNextItemsUrl);
+        return !TextUtils.isEmpty(currentNextPageUrl);
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -170,8 +171,8 @@ public abstract class BaseListInfoFragment<I extends ListInfo> extends BaseListF
         setTitle(name);
 
         if (infoListAdapter.getItemsList().size() == 0) {
-            if (result.related_streams.size() > 0) {
-                infoListAdapter.addInfoItemList(result.related_streams);
+            if (result.getRelatedItems().size() > 0) {
+                infoListAdapter.addInfoItemList(result.getRelatedItems());
                 showListFooter(hasMoreItems());
             } else {
                 infoListAdapter.clearStreamItemList();

app/src/main/java/org/schabi/newpipe/fragments/list/channel/ChannelFragment.java

@@ -27,23 +27,28 @@ import com.jakewharton.rxbinding2.view.RxView;
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.subscription.SubscriptionEntity;
+import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.channel.ChannelInfo;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
+import org.schabi.newpipe.extractor.stream.Stream;
+import org.schabi.newpipe.extractor.stream.StreamInfo;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.fragments.list.BaseListInfoFragment;
-import org.schabi.newpipe.fragments.subscription.SubscriptionService;
 import org.schabi.newpipe.info_list.InfoItemDialog;
 import org.schabi.newpipe.playlist.ChannelPlayQueue;
 import org.schabi.newpipe.playlist.PlayQueue;
 import org.schabi.newpipe.playlist.SinglePlayQueue;
 import org.schabi.newpipe.report.UserAction;
+import org.schabi.newpipe.subscription.SubscriptionService;
 import org.schabi.newpipe.util.AnimationUtils;
 import org.schabi.newpipe.util.ExtractorHelper;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
 import org.schabi.newpipe.util.NavigationHelper;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 
@@ -108,11 +113,11 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     @Override
     public void onAttach(Context context) {
         super.onAttach(context);
-        subscriptionService = SubscriptionService.getInstance();
+        subscriptionService = SubscriptionService.getInstance(activity);
     }
 
     @Override
-    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_channel, container, false);
     }
 
@@ -388,8 +393,8 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected Single<ListExtractor.NextItemsResult> loadMoreItemsLogic() {
-        return ExtractorHelper.getMoreChannelItems(serviceId, url, currentNextItemsUrl);
+    protected Single<ListExtractor.InfoItemsPage> loadMoreItemsLogic() {
+        return ExtractorHelper.getMoreChannelItems(serviceId, url, currentNextPageUrl);
     }
 
     @Override
@@ -415,8 +420,10 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
         super.handleResult(result);
 
         headerRootLayout.setVisibility(View.VISIBLE);
-        imageLoader.displayImage(result.banner_url, headerChannelBanner, DISPLAY_BANNER_OPTIONS);
-        imageLoader.displayImage(result.avatar_url, headerAvatarView, DISPLAY_AVATAR_OPTIONS);
+        imageLoader.displayImage(result.getBannerUrl(), headerChannelBanner,
+        		ImageDisplayConstants.DISPLAY_BANNER_OPTIONS);
+        imageLoader.displayImage(result.getAvatarUrl(), headerAvatarView,
+        		ImageDisplayConstants.DISPLAY_AVATAR_OPTIONS);
 
         if (result.getSubscriberCount() != -1) {
             headerSubscribersTextView.setText(Localization.localizeSubscribersCount(activity, result.getSubscriberCount()));
@@ -427,8 +434,8 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
 
         playlistCtrl.setVisibility(View.VISIBLE);
 
-        if (!result.errors.isEmpty()) {
-            showSnackBarError(result.errors, UserAction.REQUESTED_CHANNEL, NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
+        if (!result.getErrors().isEmpty()) {
+            showSnackBarError(result.getErrors(), UserAction.REQUESTED_CHANNEL, NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
         }
 
         if (disposables != null) disposables.clear();
@@ -436,24 +443,12 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
         updateSubscription(result);
         monitorSubscription(result);
 
-        headerPlayAllButton.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View view) {
-                NavigationHelper.playOnMainPlayer(activity, getPlayQueue());
-            }
-        });
-        headerPopupButton.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View view) {
-                NavigationHelper.playOnPopupPlayer(activity, getPlayQueue());
-            }
-        });
-        headerBackgroundButton.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View view) {
-                NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue());
-            }
-        });
+        headerPlayAllButton.setOnClickListener(
+                view -> NavigationHelper.playOnMainPlayer(activity, getPlayQueue()));
+        headerPopupButton.setOnClickListener(
+                view -> NavigationHelper.playOnPopupPlayer(activity, getPlayQueue()));
+        headerBackgroundButton.setOnClickListener(
+                view -> NavigationHelper.playOnBackgroundPlayer(activity, getPlayQueue()));
     }
 
     private PlayQueue getPlayQueue() {
@@ -461,17 +456,23 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     }
 
     private PlayQueue getPlayQueue(final int index) {
+        final List<StreamInfoItem> streamItems = new ArrayList<>();
+        for(InfoItem i : infoListAdapter.getItemsList()) {
+            if(i instanceof StreamInfoItem) {
+                streamItems.add((StreamInfoItem) i);
+            }
+        }
         return new ChannelPlayQueue(
                 currentInfo.getServiceId(),
                 currentInfo.getUrl(),
-                currentInfo.getNextStreamsUrl(),
-                infoListAdapter.getItemsList(),
+                currentInfo.getNextPageUrl(),
+                streamItems,
                 index
         );
     }
 
     @Override
-    public void handleNextItems(ListExtractor.NextItemsResult result) {
+    public void handleNextItems(ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
 
         if (!result.getErrors().isEmpty()) {

app/src/main/java/org/schabi/newpipe/fragments/list/feed/FeedFragment.java

@@ -21,8 +21,8 @@ import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.channel.ChannelInfo;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.fragments.list.BaseListFragment;
-import org.schabi.newpipe.fragments.subscription.SubscriptionService;
 import org.schabi.newpipe.report.UserAction;
+import org.schabi.newpipe.subscription.SubscriptionService;
 
 import java.util.Collections;
 import java.util.HashSet;
@@ -64,7 +64,7 @@ public class FeedFragment extends BaseListFragment<List<SubscriptionEntity>, Voi
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        subscriptionService = SubscriptionService.getInstance();
+        subscriptionService = SubscriptionService.getInstance(activity);
 
         FEED_LOAD_COUNT = howManyItemsToLoad();
     }
@@ -297,12 +297,12 @@ public class FeedFragment extends BaseListFragment<List<SubscriptionEntity>, Voi
             // Called only when response is non-empty
             @Override
             public void onSuccess(final ChannelInfo channelInfo) {
-                if (infoListAdapter == null || channelInfo.getRelatedStreams().isEmpty()) {
+                if (infoListAdapter == null || channelInfo.getRelatedItems().isEmpty()) {
                     onDone();
                     return;
                 }
 
-                final InfoItem item = channelInfo.getRelatedStreams().get(0);
+                final InfoItem item = channelInfo.getRelatedItems().get(0);
                 // Keep requesting new items if the current one already exists
                 boolean itemExists = doesItemExist(infoListAdapter.getItemsList(), item);
                 if (!itemExists) {
@@ -411,7 +411,7 @@ public class FeedFragment extends BaseListFragment<List<SubscriptionEntity>, Voi
 
     private boolean doesItemExist(final List<InfoItem> items, final InfoItem item) {
         for (final InfoItem existingItem : items) {
-            if (existingItem.info_type == item.info_type &&
+            if (existingItem.getInfoType() == item.getInfoType() &&
                     existingItem.getServiceId() == item.getServiceId() &&
                     existingItem.getName().equals(item.getName()) &&
                     existingItem.getUrl().equals(item.getUrl())) return true;

app/src/main/java/org/schabi/newpipe/fragments/list/kiosk/KioskFragment.java

@@ -141,12 +141,12 @@ public class KioskFragment extends BaseListInfoFragment<KioskInfo> {
     }
 
     @Override
-    public Single<ListExtractor.NextItemsResult> loadMoreItemsLogic() {
+    public Single<ListExtractor.InfoItemsPage> loadMoreItemsLogic() {
         String contentCountry = PreferenceManager
                 .getDefaultSharedPreferences(activity)
                 .getString(getString(R.string.content_country_key),
                         getString(R.string.default_country_value));
-        return ExtractorHelper.getMoreKioskItems(serviceId, url, currentNextItemsUrl, contentCountry);
+        return ExtractorHelper.getMoreKioskItems(serviceId, url, currentNextPageUrl, contentCountry);
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -174,7 +174,7 @@ public class KioskFragment extends BaseListInfoFragment<KioskInfo> {
     }
 
     @Override
-    public void handleNextItems(ListExtractor.NextItemsResult result) {
+    public void handleNextItems(ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
 
         if (!result.getErrors().isEmpty()) {

app/src/main/java/org/schabi/newpipe/fragments/list/playlist/PlaylistFragment.java

@@ -22,10 +22,12 @@ import org.reactivestreams.Subscription;
 import org.schabi.newpipe.NewPipeDatabase;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity;
+import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.playlist.PlaylistInfo;
+import org.schabi.newpipe.extractor.stream.StreamInfo;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.fragments.list.BaseListInfoFragment;
 import org.schabi.newpipe.fragments.local.RemotePlaylistManager;
@@ -35,9 +37,11 @@ import org.schabi.newpipe.playlist.PlaylistPlayQueue;
 import org.schabi.newpipe.playlist.SinglePlayQueue;
 import org.schabi.newpipe.report.UserAction;
 import org.schabi.newpipe.util.ExtractorHelper;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.NavigationHelper;
 import org.schabi.newpipe.util.ThemeHelper;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -206,8 +210,8 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     //////////////////////////////////////////////////////////////////////////*/
 
     @Override
-    protected Single<ListExtractor.NextItemsResult> loadMoreItemsLogic() {
-        return ExtractorHelper.getMorePlaylistItems(serviceId, url, currentNextItemsUrl);
+    protected Single<ListExtractor.InfoItemsPage> loadMoreItemsLogic() {
+        return ExtractorHelper.getMorePlaylistItems(serviceId, url, currentNextPageUrl);
     }
 
     @Override
@@ -268,8 +272,10 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
 
         playlistCtrl.setVisibility(View.VISIBLE);
 
-        imageLoader.displayImage(result.getUploaderAvatarUrl(), headerUploaderAvatar, DISPLAY_AVATAR_OPTIONS);
-        headerStreamCount.setText(getResources().getQuantityString(R.plurals.videos, (int) result.stream_count, (int) result.stream_count));
+        imageLoader.displayImage(result.getUploaderAvatarUrl(), headerUploaderAvatar,
+                ImageDisplayConstants.DISPLAY_AVATAR_OPTIONS);
+        headerStreamCount.setText(getResources().getQuantityString(R.plurals.videos,
+                (int) result.getStreamCount(), (int) result.getStreamCount()));
 
         if (!result.getErrors().isEmpty()) {
             showSnackBarError(result.getErrors(), UserAction.REQUESTED_PLAYLIST, NewPipe.getNameOfService(result.getServiceId()), result.getUrl(), 0);
@@ -297,17 +303,23 @@ public class PlaylistFragment extends BaseListInfoFragment<PlaylistInfo> {
     }
 
     private PlayQueue getPlayQueue(final int index) {
+        final List<StreamInfoItem> infoItems = new ArrayList<>();
+        for(InfoItem i : infoListAdapter.getItemsList()) {
+            if(i instanceof StreamInfoItem) {
+                infoItems.add((StreamInfoItem) i);
+            }
+        }
         return new PlaylistPlayQueue(
                 currentInfo.getServiceId(),
                 currentInfo.getUrl(),
-                currentInfo.getNextStreamsUrl(),
-                infoListAdapter.getItemsList(),
+                currentInfo.getNextPageUrl(),
+                infoItems,
                 index
         );
     }
 
     @Override
-    public void handleNextItems(ListExtractor.NextItemsResult result) {
+    public void handleNextItems(ListExtractor.InfoItemsPage result) {
         super.handleNextItems(result);
 
         if (!result.getErrors().isEmpty()) {

app/src/main/java/org/schabi/newpipe/fragments/list/search/SearchFragment.java

@@ -71,7 +71,9 @@ import io.reactivex.subjects.PublishSubject;
 
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
-public class SearchFragment extends BaseListFragment<SearchResult, ListExtractor.NextItemsResult> implements BackPressable {
+public class SearchFragment
+        extends BaseListFragment<SearchResult, ListExtractor.InfoItemsPage>
+        implements BackPressable {
 
     /*//////////////////////////////////////////////////////////////////////////
     // Search
@@ -527,23 +529,26 @@ public class SearchFragment extends BaseListFragment<SearchResult, ListExtractor
     }
 
     private void showDeleteSuggestionDialog(final SuggestionItem item) {
-        final Disposable onDelete = historyRecordManager.deleteSearchHistory(item.query)
-                .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(
-                        howManyDeleted -> suggestionPublisher
-                                .onNext(searchEditText.getText().toString()),
-
-                        throwable -> showSnackBarError(throwable,
-                                UserAction.SOMETHING_ELSE, "none",
-                                "Deleting item failed", R.string.general_error)
-                );
-
+        if (activity == null || historyRecordManager == null || suggestionPublisher == null ||
+                searchEditText == null || disposables == null) return;
+        final String query = item.query;
         new AlertDialog.Builder(activity)
-                .setTitle(item.query)
+                .setTitle(query)
                 .setMessage(R.string.delete_item_search_history)
                 .setCancelable(true)
                 .setNegativeButton(R.string.cancel, null)
-                .setPositiveButton(R.string.delete, (dialog, which) -> disposables.add(onDelete))
+                .setPositiveButton(R.string.delete, (dialog, which) -> {
+                    final Disposable onDelete = historyRecordManager.deleteSearchHistory(query)
+                            .observeOn(AndroidSchedulers.mainThread())
+                            .subscribe(
+                                    howManyDeleted -> suggestionPublisher
+                                            .onNext(searchEditText.getText().toString()),
+                                    throwable -> showSnackBarError(throwable,
+                                            UserAction.SOMETHING_ELSE, "none",
+                                            "Deleting item failed", R.string.general_error)
+                            );
+                    disposables.add(onDelete);
+                })
                 .show();
     }
 
@@ -701,19 +706,8 @@ public class SearchFragment extends BaseListFragment<SearchResult, ListExtractor
         searchDisposable = ExtractorHelper.searchFor(serviceId, searchQuery, currentPage, contentCountry, filter)
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(new Consumer<SearchResult>() {
-                    @Override
-                    public void accept(@NonNull SearchResult result) throws Exception {
-                        isLoading.set(false);
-                        handleResult(result);
-                    }
-                }, new Consumer<Throwable>() {
-                    @Override
-                    public void accept(@NonNull Throwable throwable) throws Exception {
-                        isLoading.set(false);
-                        onError(throwable);
-                    }
-                });
+                .doOnEvent((searchResult, throwable) -> isLoading.set(false))
+                .subscribe(this::handleResult, this::onError);
     }
 
     @Override
@@ -725,19 +719,8 @@ public class SearchFragment extends BaseListFragment<SearchResult, ListExtractor
         searchDisposable = ExtractorHelper.getMoreSearchItems(serviceId, searchQuery, currentNextPage, contentCountry, filter)
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(new Consumer<ListExtractor.NextItemsResult>() {
-                    @Override
-                    public void accept(@NonNull ListExtractor.NextItemsResult result) throws Exception {
-                        isLoading.set(false);
-                        handleNextItems(result);
-                    }
-                }, new Consumer<Throwable>() {
-                    @Override
-                    public void accept(@NonNull Throwable throwable) throws Exception {
-                        isLoading.set(false);
-                        onError(throwable);
-                    }
-                });
+                .doOnEvent((nextItemsResult, throwable) -> isLoading.set(false))
+                .subscribe(this::handleNextItems, this::onError);
     }
 
     @Override
@@ -778,12 +761,7 @@ public class SearchFragment extends BaseListFragment<SearchResult, ListExtractor
     public void handleSuggestions(@NonNull final List<SuggestionItem> suggestions) {
         if (DEBUG) Log.d(TAG, "handleSuggestions() called with: suggestions = [" + suggestions + "]");
         suggestionsRecyclerView.smoothScrollToPosition(0);
-        suggestionsRecyclerView.post(new Runnable() {
-            @Override
-            public void run() {
-                suggestionListAdapter.setItems(suggestions);
-            }
-        });
+        suggestionsRecyclerView.post(() -> suggestionListAdapter.setItems(suggestions));
 
         if (errorPanelRoot.getVisibility() == View.VISIBLE) {
             hideLoading();
@@ -841,10 +819,10 @@ public class SearchFragment extends BaseListFragment<SearchResult, ListExtractor
     }
 
     @Override
-    public void handleNextItems(ListExtractor.NextItemsResult result) {
+    public void handleNextItems(ListExtractor.InfoItemsPage result) {
         showListFooter(false);
-        currentPage = Integer.parseInt(result.getNextItemsUrl());
-        infoListAdapter.addInfoItemList(result.getNextItemsList());
+        currentPage = Integer.parseInt(result.getNextPageUrl());
+        infoListAdapter.addInfoItemList(result.getItems());
 
         if (!result.getErrors().isEmpty()) {
             showSnackBarError(result.getErrors(), UserAction.SEARCHED, NewPipe.getNameOfService(serviceId)

app/src/main/java/org/schabi/newpipe/fragments/local/LocalItemBuilder.java

@@ -1,12 +1,10 @@
 package org.schabi.newpipe.fragments.local;
 
 import android.content.Context;
-import android.graphics.Bitmap;
 import android.widget.ImageView;
 
 import com.nostra13.universalimageloader.core.DisplayImageOptions;
 import com.nostra13.universalimageloader.core.ImageLoader;
-import com.nostra13.universalimageloader.core.process.BitmapProcessor;
 
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.util.OnClickGesture;

app/src/main/java/org/schabi/newpipe/fragments/local/bookmark/BaseLocalListFragment.java

@@ -151,7 +151,10 @@ public abstract class BaseLocalListFragment<I, N> extends BaseStateFragment<I>
 
     @Override
     public void showListFooter(final boolean show) {
-        itemsList.post(() -> itemListAdapter.showFooter(show));
+        if (itemsList == null) return;
+        itemsList.post(() -> {
+            if (itemListAdapter != null) itemListAdapter.showFooter(show);
+        });
     }
 
     @Override

app/src/main/java/org/schabi/newpipe/fragments/local/dialog/PlaylistAppendDialog.java

@@ -27,8 +27,6 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
-import javax.annotation.Nonnull;
-
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.Disposable;
 
@@ -147,7 +145,7 @@ public final class PlaylistAppendDialog extends PlaylistDialog {
 
     private void onPlaylistSelected(@NonNull LocalPlaylistManager manager,
                                     @NonNull PlaylistMetadataEntry playlist,
-                                    @Nonnull List<StreamEntity> streams) {
+                                    @NonNull List<StreamEntity> streams) {
         if (getStreams() == null) return;
 
         @SuppressLint("ShowToast")

app/src/main/java/org/schabi/newpipe/fragments/local/holder/LocalItemHolder.java

@@ -1,14 +1,8 @@
 package org.schabi.newpipe.fragments.local.holder;
 
-import android.graphics.Bitmap;
-import android.support.annotation.DimenRes;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.ViewGroup;
-import android.widget.ImageView;
-
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
-import com.nostra13.universalimageloader.core.process.BitmapProcessor;
 
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.fragments.local.LocalItemBuilder;
@@ -45,19 +39,4 @@ public abstract class LocalItemHolder extends RecyclerView.ViewHolder {
     }
 
     public abstract void updateFromItem(final LocalItem item, final DateFormat dateFormat);
-
-    /*//////////////////////////////////////////////////////////////////////////
-    // ImageLoaderOptions
-    //////////////////////////////////////////////////////////////////////////*/
-
-    /**
-     * Base display options
-     */
-    public static final DisplayImageOptions BASE_DISPLAY_IMAGE_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cacheInMemory(true)
-                    .cacheOnDisk(true)
-                    .bitmapConfig(Bitmap.Config.RGB_565)
-                    .resetViewBeforeLoading(false)
-                    .build();
 }

app/src/main/java/org/schabi/newpipe/fragments/local/holder/LocalPlaylistItemHolder.java

@@ -2,15 +2,11 @@ package org.schabi.newpipe.fragments.local.holder;
 
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.ImageView;
-import android.widget.TextView;
 
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
-
-import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.database.playlist.PlaylistMetadataEntry;
 import org.schabi.newpipe.fragments.local.LocalItemBuilder;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 
 import java.text.DateFormat;
 
@@ -29,7 +25,8 @@ public class LocalPlaylistItemHolder extends PlaylistItemHolder {
         itemStreamCountView.setText(String.valueOf(item.streamCount));
         itemUploaderView.setVisibility(View.INVISIBLE);
 
-        itemBuilder.displayImage(item.thumbnailUrl, itemThumbnailView, DISPLAY_THUMBNAIL_OPTIONS);
+        itemBuilder.displayImage(item.thumbnailUrl, itemThumbnailView,
+                ImageDisplayConstants.DISPLAY_PLAYLIST_OPTIONS);
 
         super.updateFromItem(localItem, dateFormat);
     }

app/src/main/java/org/schabi/newpipe/fragments/local/holder/LocalPlaylistStreamItemHolder.java

@@ -1,6 +1,5 @@
 package org.schabi.newpipe.fragments.local.holder;
 
-import android.graphics.Bitmap;
 import android.support.v4.content.ContextCompat;
 import android.view.MotionEvent;
 import android.view.View;
@@ -8,14 +7,12 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
-import com.nostra13.universalimageloader.core.assist.ImageScaleType;
-
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.database.playlist.PlaylistStreamEntry;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.fragments.local.LocalItemBuilder;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
 
 import java.text.DateFormat;
@@ -61,7 +58,8 @@ public class LocalPlaylistStreamItemHolder extends LocalItemHolder {
         }
 
         // Default thumbnail is shown on error, while loading and if the url is empty
-        itemBuilder.displayImage(item.thumbnailUrl, itemThumbnailView, DISPLAY_THUMBNAIL_OPTIONS);
+        itemBuilder.displayImage(item.thumbnailUrl, itemThumbnailView,
+                ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS);
 
         itemView.setOnClickListener(view -> {
             if (itemBuilder.getOnItemSelectedListener() != null) {
@@ -92,15 +90,4 @@ public class LocalPlaylistStreamItemHolder extends LocalItemHolder {
             return false;
         };
     }
-
-    /**
-     * Display options for stream thumbnails
-     */
-    private static final DisplayImageOptions DISPLAY_THUMBNAIL_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
-                    .showImageOnFail(R.drawable.dummy_thumbnail)
-                    .showImageForEmptyUri(R.drawable.dummy_thumbnail)
-                    .showImageOnLoading(R.drawable.dummy_thumbnail)
-                    .build();
 }

app/src/main/java/org/schabi/newpipe/fragments/local/holder/LocalStatisticStreamItemHolder.java

@@ -6,13 +6,12 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
-
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.database.stream.StreamStatisticsEntry;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.fragments.local.LocalItemBuilder;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
 
 import java.text.DateFormat;
@@ -84,7 +83,8 @@ public class LocalStatisticStreamItemHolder extends LocalItemHolder {
         itemAdditionalDetails.setText(getStreamInfoDetailLine(item, dateFormat));
 
         // Default thumbnail is shown on error, while loading and if the url is empty
-        itemBuilder.displayImage(item.thumbnailUrl, itemThumbnailView, DISPLAY_THUMBNAIL_OPTIONS);
+        itemBuilder.displayImage(item.thumbnailUrl, itemThumbnailView,
+                ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS);
 
         itemView.setOnClickListener(view -> {
             if (itemBuilder.getOnItemSelectedListener() != null) {
@@ -100,15 +100,4 @@ public class LocalStatisticStreamItemHolder extends LocalItemHolder {
             return true;
         });
     }
-
-    /**
-     * Display options for stream thumbnails
-     */
-    public static final DisplayImageOptions DISPLAY_THUMBNAIL_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
-                    .showImageOnFail(R.drawable.dummy_thumbnail)
-                    .showImageForEmptyUri(R.drawable.dummy_thumbnail)
-                    .showImageOnLoading(R.drawable.dummy_thumbnail)
-                    .build();
 }

app/src/main/java/org/schabi/newpipe/fragments/local/holder/PlaylistItemHolder.java

@@ -4,8 +4,6 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
-
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.fragments.local.LocalItemBuilder;
@@ -48,15 +46,4 @@ public abstract class PlaylistItemHolder extends LocalItemHolder {
             return true;
         });
     }
-
-    /**
-     * Display options for playlist thumbnails
-     */
-    public static final DisplayImageOptions DISPLAY_THUMBNAIL_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
-                    .showImageOnLoading(R.drawable.dummy_thumbnail_playlist)
-                    .showImageForEmptyUri(R.drawable.dummy_thumbnail_playlist)
-                    .showImageOnFail(R.drawable.dummy_thumbnail_playlist)
-                    .build();
 }

app/src/main/java/org/schabi/newpipe/fragments/local/holder/RemotePlaylistItemHolder.java

@@ -6,6 +6,7 @@ import org.schabi.newpipe.database.LocalItem;
 import org.schabi.newpipe.database.playlist.model.PlaylistRemoteEntity;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.fragments.local.LocalItemBuilder;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
 
 import java.text.DateFormat;
@@ -26,7 +27,7 @@ public class RemotePlaylistItemHolder extends PlaylistItemHolder {
                 NewPipe.getNameOfService(item.getServiceId())));
 
         itemBuilder.displayImage(item.getThumbnailUrl(), itemThumbnailView,
-                DISPLAY_THUMBNAIL_OPTIONS);
+                ImageDisplayConstants.DISPLAY_PLAYLIST_OPTIONS);
 
         super.updateFromItem(localItem, dateFormat);
     }

app/src/main/java/org/schabi/newpipe/fragments/subscription/ImportConfirmationDialog.java

@@ -0,0 +1,64 @@
+package org.schabi.newpipe.fragments.subscription;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.DialogFragment;
+import android.support.v4.app.Fragment;
+
+import org.schabi.newpipe.R;
+import org.schabi.newpipe.util.ThemeHelper;
+
+import icepick.Icepick;
+import icepick.State;
+
+public class ImportConfirmationDialog extends DialogFragment {
+    @State
+    protected Intent resultServiceIntent;
+
+    public void setResultServiceIntent(Intent resultServiceIntent) {
+        this.resultServiceIntent = resultServiceIntent;
+    }
+
+    public static void show(@NonNull Fragment fragment, @NonNull Intent resultServiceIntent) {
+        if (fragment.getFragmentManager() == null) return;
+
+        final ImportConfirmationDialog confirmationDialog = new ImportConfirmationDialog();
+        confirmationDialog.setResultServiceIntent(resultServiceIntent);
+        confirmationDialog.show(fragment.getFragmentManager(), null);
+    }
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
+        return new AlertDialog.Builder(getContext(), ThemeHelper.getDialogTheme(getContext()))
+                .setMessage(R.string.import_network_expensive_warning)
+                .setCancelable(true)
+                .setNegativeButton(R.string.cancel, null)
+                .setPositiveButton(android.R.string.ok, (dialogInterface, i) -> {
+                    if (resultServiceIntent != null && getContext() != null) {
+                        getContext().startService(resultServiceIntent);
+                    }
+                    dismiss();
+                })
+                .create();
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        if (resultServiceIntent == null) throw new IllegalStateException("Result intent is null");
+
+        Icepick.restoreInstanceState(this, savedInstanceState);
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        Icepick.saveInstanceState(this, outState);
+    }
+}

app/src/main/java/org/schabi/newpipe/fragments/subscription/SubscriptionFragment.java

@@ -1,30 +1,62 @@
 package org.schabi.newpipe.fragments.subscription;
 
+import android.app.Activity;
+import android.content.BroadcastReceiver;
 import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.graphics.Color;
+import android.graphics.PorterDuff;
 import android.os.Bundle;
+import android.os.Environment;
 import android.os.Parcelable;
+import android.support.annotation.DrawableRes;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.v4.content.LocalBroadcastManager;
+import android.support.v7.app.ActionBar;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.nononsenseapps.filepicker.Utils;
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.subscription.SubscriptionEntity;
 import org.schabi.newpipe.extractor.InfoItem;
+import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
+import org.schabi.newpipe.extractor.exceptions.ExtractionException;
+import org.schabi.newpipe.extractor.subscription.SubscriptionExtractor;
 import org.schabi.newpipe.fragments.BaseStateFragment;
 import org.schabi.newpipe.info_list.InfoListAdapter;
 import org.schabi.newpipe.report.UserAction;
+import org.schabi.newpipe.subscription.SubscriptionService;
+import org.schabi.newpipe.subscription.services.SubscriptionsExportService;
+import org.schabi.newpipe.subscription.services.SubscriptionsImportService;
+import org.schabi.newpipe.util.FilePickerActivityHelper;
 import org.schabi.newpipe.util.NavigationHelper;
 import org.schabi.newpipe.util.OnClickGesture;
+import org.schabi.newpipe.util.ServiceHelper;
+import org.schabi.newpipe.util.ThemeHelper;
+import org.schabi.newpipe.views.CollapsibleView;
 
+import java.io.File;
+import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
+import java.util.Date;
 import java.util.List;
+import java.util.Locale;
 
 import icepick.State;
 import io.reactivex.Observer;
@@ -33,18 +65,29 @@ import io.reactivex.disposables.CompositeDisposable;
 import io.reactivex.disposables.Disposable;
 import io.reactivex.schedulers.Schedulers;
 
+import static org.schabi.newpipe.subscription.services.SubscriptionsImportService.KEY_MODE;
+import static org.schabi.newpipe.subscription.services.SubscriptionsImportService.KEY_VALUE;
+import static org.schabi.newpipe.subscription.services.SubscriptionsImportService.PREVIOUS_EXPORT_MODE;
+import static org.schabi.newpipe.util.AnimationUtils.animateRotation;
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
 public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEntity>> {
-    private View headerRootLayout;
+    private static final int REQUEST_EXPORT_CODE = 666;
+    private static final int REQUEST_IMPORT_CODE = 667;
 
-    private InfoListAdapter infoListAdapter;
     private RecyclerView itemsList;
-
     @State
     protected Parcelable itemsListState;
+    private InfoListAdapter infoListAdapter;
+
+    private View headerRootLayout;
+    private View whatsNewItemListHeader;
+    private View importExportListHeader;
+
+    @State
+    protected Parcelable importExportOptionsState;
+    private CollapsibleView importExportOptions;
 
-    /* Used for independent events */
     private CompositeDisposable disposables = new CompositeDisposable();
     private SubscriptionService subscriptionService;
 
@@ -52,39 +95,48 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
     // Fragment LifeCycle
     ///////////////////////////////////////////////////////////////////////////
 
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+    }
 
     @Override
     public void setUserVisibleHint(boolean isVisibleToUser) {
         super.setUserVisibleHint(isVisibleToUser);
-        if(isVisibleToUser && activity != null) {
-            activity.getSupportActionBar()
-                    .setTitle(R.string.tab_subscriptions);
+        if (isVisibleToUser) {
+            setTitle(getString(R.string.tab_subscriptions));
         }
     }
 
-
     @Override
     public void onAttach(Context context) {
         super.onAttach(context);
         infoListAdapter = new InfoListAdapter(activity);
-        subscriptionService = SubscriptionService.getInstance();
+        subscriptionService = SubscriptionService.getInstance(activity);
     }
 
     @Nullable
     @Override
-    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
-        activity.getSupportActionBar().setDisplayShowTitleEnabled(true);
-        activity.setTitle(R.string.tab_subscriptions);
-        if(useAsFrontPage) {
-            activity.getSupportActionBar().setDisplayHomeAsUpEnabled(false);
-        }
+    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
         return inflater.inflate(R.layout.fragment_subscription, container, false);
     }
 
+    @Override
+    public void onResume() {
+        super.onResume();
+        setupBroadcastReceiver();
+    }
+
     @Override
     public void onPause() {
         super.onPause();
         itemsListState = itemsList.getLayoutManager().onSaveInstanceState();
+        importExportOptionsState = importExportOptions.onSaveInstanceState();
+
+        if (subscriptionBroadcastReceiver != null && activity != null) {
+            LocalBroadcastManager.getInstance(activity).unregisterReceiver(subscriptionBroadcastReceiver);
+        }
     }
 
     @Override
@@ -103,9 +155,131 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
         super.onDestroy();
     }
 
-    ///////////////////////////////////////////////////////////////////////////
+    /*/////////////////////////////////////////////////////////////////////////
+    // Menu
+    /////////////////////////////////////////////////////////////////////////*/
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        super.onCreateOptionsMenu(menu, inflater);
+
+        ActionBar supportActionBar = activity.getSupportActionBar();
+        if (supportActionBar != null) {
+            supportActionBar.setDisplayShowTitleEnabled(true);
+            setTitle(getString(R.string.tab_subscriptions));
+        }
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Subscriptions import/export
+    //////////////////////////////////////////////////////////////////////////*/
+
+    private BroadcastReceiver subscriptionBroadcastReceiver;
+
+    private void setupBroadcastReceiver() {
+        if (activity == null) return;
+
+        if (subscriptionBroadcastReceiver != null) {
+            LocalBroadcastManager.getInstance(activity).unregisterReceiver(subscriptionBroadcastReceiver);
+        }
+
+        final IntentFilter filters = new IntentFilter();
+        filters.addAction(SubscriptionsExportService.EXPORT_COMPLETE_ACTION);
+        filters.addAction(SubscriptionsImportService.IMPORT_COMPLETE_ACTION);
+        subscriptionBroadcastReceiver = new BroadcastReceiver() {
+            @Override
+            public void onReceive(Context context, Intent intent) {
+                if (importExportOptions != null) importExportOptions.collapse();
+            }
+        };
+
+        LocalBroadcastManager.getInstance(activity).registerReceiver(subscriptionBroadcastReceiver, filters);
+    }
+
+    private View addItemView(final String title, @DrawableRes final int icon, ViewGroup container) {
+        final View itemRoot = View.inflate(getContext(), R.layout.subscription_import_export_item, null);
+        final TextView titleView = itemRoot.findViewById(android.R.id.text1);
+        final ImageView iconView = itemRoot.findViewById(android.R.id.icon1);
+
+        titleView.setText(title);
+        iconView.setImageResource(icon);
+
+        container.addView(itemRoot);
+        return itemRoot;
+    }
+
+    private void setupImportFromItems(final ViewGroup listHolder) {
+        final View previousBackupItem = addItemView(getString(R.string.previous_export), ThemeHelper.resolveResourceIdFromAttr(getContext(), R.attr.ic_backup), listHolder);
+        previousBackupItem.setOnClickListener(item -> onImportPreviousSelected());
+
+        final int iconColor = ThemeHelper.isLightThemeSelected(getContext()) ? Color.BLACK : Color.WHITE;
+        final String[] services = getResources().getStringArray(R.array.service_list);
+        for (String serviceName : services) {
+            try {
+                final StreamingService service = NewPipe.getService(serviceName);
+
+                final SubscriptionExtractor subscriptionExtractor = service.getSubscriptionExtractor();
+                if (subscriptionExtractor == null) continue;
+
+                final List<SubscriptionExtractor.ContentSource> supportedSources = subscriptionExtractor.getSupportedSources();
+                if (supportedSources.isEmpty()) continue;
+
+                final View itemView = addItemView(serviceName, ServiceHelper.getIcon(service.getServiceId()), listHolder);
+                final ImageView iconView = itemView.findViewById(android.R.id.icon1);
+                iconView.setColorFilter(iconColor, PorterDuff.Mode.SRC_IN);
+
+                itemView.setOnClickListener(selectedItem -> onImportFromServiceSelected(service.getServiceId()));
+            } catch (ExtractionException e) {
+                throw new RuntimeException("Services array contains an entry that it's not a valid service name (" + serviceName + ")", e);
+            }
+        }
+    }
+
+    private void setupExportToItems(final ViewGroup listHolder) {
+        final View previousBackupItem = addItemView(getString(R.string.file), ThemeHelper.resolveResourceIdFromAttr(getContext(), R.attr.ic_save), listHolder);
+        previousBackupItem.setOnClickListener(item -> onExportSelected());
+    }
+
+    private void onImportFromServiceSelected(int serviceId) {
+        if (getParentFragment() == null) return;
+        NavigationHelper.openSubscriptionsImportFragment(getParentFragment().getFragmentManager(), serviceId);
+    }
+
+    private void onImportPreviousSelected() {
+        startActivityForResult(FilePickerActivityHelper.chooseSingleFile(activity), REQUEST_IMPORT_CODE);
+    }
+
+    private void onExportSelected() {
+        final String date = new SimpleDateFormat("yyyyMMddHHmm", Locale.ENGLISH).format(new Date());
+        final String exportName = "newpipe_subscriptions_" + date + ".json";
+        final File exportFile = new File(Environment.getExternalStorageDirectory(), exportName);
+
+        startActivityForResult(FilePickerActivityHelper.chooseFileToSave(activity, exportFile.getAbsolutePath()), REQUEST_EXPORT_CODE);
+    }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if (data != null && data.getData() != null && resultCode == Activity.RESULT_OK) {
+            if (requestCode == REQUEST_EXPORT_CODE) {
+                final File exportFile = Utils.getFileForUri(data.getData());
+                if (!exportFile.getParentFile().canWrite() || !exportFile.getParentFile().canRead()) {
+                    Toast.makeText(activity, R.string.invalid_directory, Toast.LENGTH_SHORT).show();
+                } else {
+                    activity.startService(new Intent(activity, SubscriptionsExportService.class)
+                            .putExtra(SubscriptionsExportService.KEY_FILE_PATH, exportFile.getAbsolutePath()));
+                }
+            } else if (requestCode == REQUEST_IMPORT_CODE) {
+                final String path = Utils.getFileForUri(data.getData()).getAbsolutePath();
+                ImportConfirmationDialog.show(this, new Intent(activity, SubscriptionsImportService.class)
+                        .putExtra(KEY_MODE, PREVIOUS_EXPORT_MODE)
+                        .putExtra(KEY_VALUE, path));
+            }
+        }
+    }
+    /*/////////////////////////////////////////////////////////////////////////
     // Fragment Views
-    ///////////////////////////////////////////////////////////////////////////
+    /////////////////////////////////////////////////////////////////////////*/
 
     @Override
     protected void initViews(View rootView, Bundle savedInstanceState) {
@@ -116,9 +290,27 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
         itemsList.setLayoutManager(new LinearLayoutManager(activity));
 
         infoListAdapter.setHeader(headerRootLayout = activity.getLayoutInflater().inflate(R.layout.subscription_header, itemsList, false));
-        infoListAdapter.useMiniItemVariants(true);
+        whatsNewItemListHeader = headerRootLayout.findViewById(R.id.whats_new);
+        importExportListHeader = headerRootLayout.findViewById(R.id.import_export);
+        importExportOptions = headerRootLayout.findViewById(R.id.import_export_options);
 
+        infoListAdapter.useMiniItemVariants(true);
         itemsList.setAdapter(infoListAdapter);
+
+        setupImportFromItems(headerRootLayout.findViewById(R.id.import_from_options));
+        setupExportToItems(headerRootLayout.findViewById(R.id.export_to_options));
+
+        if (importExportOptionsState != null) {
+            importExportOptions.onRestoreInstanceState(importExportOptionsState);
+            importExportOptionsState = null;
+        }
+
+        importExportOptions.addListener(getExpandIconSyncListener(headerRootLayout.findViewById(R.id.import_export_expand_icon)));
+        importExportOptions.ready();
+    }
+
+    private CollapsibleView.StateListener getExpandIconSyncListener(final ImageView iconView) {
+        return newState -> animateRotation(iconView, 250, newState == CollapsibleView.COLLAPSED ? 0 : 180);
     }
 
     @Override
@@ -130,12 +322,14 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
             public void selected(ChannelInfoItem selectedItem) {
                 // Requires the parent fragment to find holder for fragment replacement
                 NavigationHelper.openChannelFragment(getParentFragment().getFragmentManager(),
-                        selectedItem.getServiceId(), selectedItem.url, selectedItem.getName());
+                        selectedItem.getServiceId(), selectedItem.getUrl(), selectedItem.getName());
             }
         });
 
-        headerRootLayout.setOnClickListener(view ->
+        //noinspection ConstantConditions
+        whatsNewItemListHeader.setOnClickListener(v ->
                 NavigationHelper.openWhatsNewFragment(getParentFragment().getFragmentManager()));
+        importExportListHeader.setOnClickListener(v -> importExportOptions.switchState());
     }
 
     private void resetFragment() {
@@ -189,6 +383,7 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
         infoListAdapter.clearStreamItemList();
 
         if (result.isEmpty()) {
+            whatsNewItemListHeader.setVisibility(View.GONE);
             showEmptyState();
         } else {
             infoListAdapter.addInfoItemList(getSubscriptionItems(result));
@@ -196,7 +391,7 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
                 itemsList.getLayoutManager().onRestoreInstanceState(itemsListState);
                 itemsListState = null;
             }
-
+            whatsNewItemListHeader.setVisibility(View.VISIBLE);
             hideLoading();
         }
     }
@@ -206,12 +401,8 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
         List<InfoItem> items = new ArrayList<>();
         for (final SubscriptionEntity subscription : subscriptions) items.add(subscription.toChannelInfoItem());
 
-        Collections.sort(items, new Comparator<InfoItem>() {
-            @Override
-            public int compare(InfoItem o1, InfoItem o2) {
-                return o1.name.compareToIgnoreCase(o2.name);
-            }
-        });
+        Collections.sort(items,
+                (InfoItem o1, InfoItem o2) -> o1.getName().compareToIgnoreCase(o2.getName()));
         return items;
     }
 
@@ -231,12 +422,6 @@ public class SubscriptionFragment extends BaseStateFragment<List<SubscriptionEnt
         animateView(itemsList, true, 200);
     }
 
-    @Override
-    public void showEmptyState() {
-        super.showEmptyState();
-        animateView(itemsList, false, 200);
-    }
-
     ///////////////////////////////////////////////////////////////////////////
     // Fragment Error Handling
     ///////////////////////////////////////////////////////////////////////////

app/src/main/java/org/schabi/newpipe/fragments/subscription/SubscriptionsImportFragment.java

@@ -0,0 +1,210 @@
+package org.schabi.newpipe.fragments.subscription;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.annotation.StringRes;
+import android.support.v4.text.util.LinkifyCompat;
+import android.support.v7.app.ActionBar;
+import android.text.TextUtils;
+import android.text.util.Linkify;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.TextView;
+
+import com.nononsenseapps.filepicker.Utils;
+
+import org.schabi.newpipe.BaseFragment;
+import org.schabi.newpipe.R;
+import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.exceptions.ExtractionException;
+import org.schabi.newpipe.extractor.subscription.SubscriptionExtractor;
+import org.schabi.newpipe.report.ErrorActivity;
+import org.schabi.newpipe.report.UserAction;
+import org.schabi.newpipe.subscription.services.SubscriptionsImportService;
+import org.schabi.newpipe.util.Constants;
+import org.schabi.newpipe.util.FilePickerActivityHelper;
+import org.schabi.newpipe.util.ServiceHelper;
+
+import java.util.Collections;
+import java.util.List;
+
+import icepick.State;
+
+import static org.schabi.newpipe.extractor.subscription.SubscriptionExtractor.ContentSource.CHANNEL_URL;
+import static org.schabi.newpipe.subscription.services.SubscriptionsImportService.CHANNEL_URL_MODE;
+import static org.schabi.newpipe.subscription.services.SubscriptionsImportService.INPUT_STREAM_MODE;
+import static org.schabi.newpipe.subscription.services.SubscriptionsImportService.KEY_MODE;
+import static org.schabi.newpipe.subscription.services.SubscriptionsImportService.KEY_VALUE;
+
+public class SubscriptionsImportFragment extends BaseFragment {
+    private static final int REQUEST_IMPORT_FILE_CODE = 666;
+
+    @State
+    protected int currentServiceId = Constants.NO_SERVICE_ID;
+
+    private List<SubscriptionExtractor.ContentSource> supportedSources;
+    private String relatedUrl;
+    @StringRes
+    private int instructionsString;
+
+    public static SubscriptionsImportFragment getInstance(int serviceId) {
+        SubscriptionsImportFragment instance = new SubscriptionsImportFragment();
+        instance.setInitialData(serviceId);
+        return instance;
+    }
+
+    public void setInitialData(int serviceId) {
+        this.currentServiceId = serviceId;
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Views
+    //////////////////////////////////////////////////////////////////////////*/
+
+    private TextView infoTextView;
+
+    private EditText inputText;
+    private Button inputButton;
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Fragment LifeCycle
+    ///////////////////////////////////////////////////////////////////////////
+
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        setupServiceVariables();
+        if (supportedSources.isEmpty() && currentServiceId != Constants.NO_SERVICE_ID) {
+            ErrorActivity.reportError(activity, Collections.emptyList(), null, null, ErrorActivity.ErrorInfo.make(UserAction.SOMETHING_ELSE,
+                    NewPipe.getNameOfService(currentServiceId), "Service don't support importing", R.string.general_error));
+            activity.finish();
+        }
+    }
+
+    @Override
+    public void setUserVisibleHint(boolean isVisibleToUser) {
+        super.setUserVisibleHint(isVisibleToUser);
+        if (isVisibleToUser) {
+            setTitle(getString(R.string.import_title));
+        }
+    }
+
+    @Nullable
+    @Override
+    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.fragment_import, container, false);
+    }
+
+    /*/////////////////////////////////////////////////////////////////////////
+    // Fragment Views
+    /////////////////////////////////////////////////////////////////////////*/
+
+    @Override
+    protected void initViews(View rootView, Bundle savedInstanceState) {
+        super.initViews(rootView, savedInstanceState);
+
+        inputButton = rootView.findViewById(R.id.input_button);
+        inputText = rootView.findViewById(R.id.input_text);
+
+        infoTextView = rootView.findViewById(R.id.info_text_view);
+
+        // TODO: Support services that can import from more than one source (show the option to the user)
+        if (supportedSources.contains(CHANNEL_URL)) {
+            inputButton.setText(R.string.import_title);
+            inputText.setVisibility(View.VISIBLE);
+            inputText.setHint(ServiceHelper.getImportInstructionsHint(currentServiceId));
+        } else {
+            inputButton.setText(R.string.import_file_title);
+        }
+
+        if (instructionsString != 0) {
+            if (TextUtils.isEmpty(relatedUrl)) {
+                setInfoText(getString(instructionsString));
+            } else {
+                setInfoText(getString(instructionsString, relatedUrl));
+            }
+        } else {
+            setInfoText("");
+        }
+
+        ActionBar supportActionBar = activity.getSupportActionBar();
+        if (supportActionBar != null) {
+            supportActionBar.setDisplayShowTitleEnabled(true);
+            setTitle(getString(R.string.import_title));
+        }
+    }
+
+    @Override
+    protected void initListeners() {
+        super.initListeners();
+        inputButton.setOnClickListener(v -> onImportClicked());
+    }
+
+    private void onImportClicked() {
+        if (inputText.getVisibility() == View.VISIBLE) {
+            final String value = inputText.getText().toString();
+            if (!value.isEmpty()) onImportUrl(value);
+        } else {
+            onImportFile();
+        }
+    }
+
+    public void onImportUrl(String value) {
+        ImportConfirmationDialog.show(this, new Intent(activity, SubscriptionsImportService.class)
+                .putExtra(KEY_MODE, CHANNEL_URL_MODE)
+                .putExtra(KEY_VALUE, value)
+                .putExtra(Constants.KEY_SERVICE_ID, currentServiceId));
+    }
+
+    public void onImportFile() {
+        startActivityForResult(FilePickerActivityHelper.chooseSingleFile(activity), REQUEST_IMPORT_FILE_CODE);
+    }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+        if (data == null) return;
+
+        if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_IMPORT_FILE_CODE && data.getData() != null) {
+            final String path = Utils.getFileForUri(data.getData()).getAbsolutePath();
+            ImportConfirmationDialog.show(this, new Intent(activity, SubscriptionsImportService.class)
+                    .putExtra(KEY_MODE, INPUT_STREAM_MODE)
+                    .putExtra(KEY_VALUE, path)
+                    .putExtra(Constants.KEY_SERVICE_ID, currentServiceId));
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Subscriptions
+    ///////////////////////////////////////////////////////////////////////////
+
+    private void setupServiceVariables() {
+        if (currentServiceId != Constants.NO_SERVICE_ID) {
+            try {
+                final SubscriptionExtractor extractor = NewPipe.getService(currentServiceId).getSubscriptionExtractor();
+                supportedSources = extractor.getSupportedSources();
+                relatedUrl = extractor.getRelatedUrl();
+                instructionsString = ServiceHelper.getImportInstructions(currentServiceId);
+                return;
+            } catch (ExtractionException ignored) {
+            }
+        }
+
+        supportedSources = Collections.emptyList();
+        relatedUrl = null;
+        instructionsString = 0;
+    }
+
+    private void setInfoText(String infoString) {
+        infoTextView.setText(infoString);
+        LinkifyCompat.addLinks(infoTextView, Linkify.WEB_URLS);
+    }
+}

app/src/main/java/org/schabi/newpipe/history/WatchHistoryFragment.java

@@ -20,6 +20,7 @@ import com.nostra13.universalimageloader.core.ImageLoader;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.history.model.StreamHistoryEntry;
 import org.schabi.newpipe.info_list.holder.StreamInfoItemHolder;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
 import org.schabi.newpipe.util.NavigationHelper;
 
@@ -147,7 +148,7 @@ public class WatchHistoryFragment extends HistoryFragment<StreamHistoryEntry> {
             holder.uploader.setText(entry.uploader);
             holder.duration.setText(Localization.getDurationString(entry.duration));
             ImageLoader.getInstance().displayImage(entry.thumbnailUrl, holder.thumbnailView,
-                    StreamInfoItemHolder.DISPLAY_THUMBNAIL_OPTIONS);
+                    ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS);
         }
     }
 

app/src/main/java/org/schabi/newpipe/info_list/InfoItemBuilder.java

@@ -60,7 +60,7 @@ public class InfoItemBuilder {
     }
 
     public View buildView(@NonNull ViewGroup parent, @NonNull final InfoItem infoItem, boolean useMiniVariant) {
-        InfoItemHolder holder = holderFromInfoType(parent, infoItem.info_type, useMiniVariant);
+        InfoItemHolder holder = holderFromInfoType(parent, infoItem.getInfoType(), useMiniVariant);
         holder.updateFromItem(infoItem);
         return holder.itemView;
     }

app/src/main/java/org/schabi/newpipe/info_list/InfoListAdapter.java

@@ -203,7 +203,7 @@ public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolde
             return FOOTER_TYPE;
         }
         final InfoItem item = infoItemList.get(position);
-        switch (item.info_type) {
+        switch (item.getInfoType()) {
             case STREAM:
                 return useMiniVariant ? MINI_STREAM_HOLDER_TYPE : STREAM_HOLDER_TYPE;
             case CHANNEL:

app/src/main/java/org/schabi/newpipe/info_list/holder/ChannelInfoItemHolder.java

@@ -44,15 +44,16 @@ public class ChannelInfoItemHolder extends ChannelMiniInfoItemHolder {
         if (!(infoItem instanceof ChannelInfoItem)) return;
         final ChannelInfoItem item = (ChannelInfoItem) infoItem;
 
-        itemChannelDescriptionView.setText(item.description);
+        itemChannelDescriptionView.setText(item.getDescription());
     }
 
     @Override
     protected String getDetailLine(final ChannelInfoItem item) {
         String details = super.getDetailLine(item);
 
-        if (item.stream_count >= 0) {
-            String formattedVideoAmount = Localization.localizeStreamCount(itemBuilder.getContext(), item.stream_count);
+        if (item.getStreamCount() >= 0) {
+            String formattedVideoAmount = Localization.localizeStreamCount(itemBuilder.getContext(),
+                    item.getStreamCount());
 
             if (!details.isEmpty()) {
                 details += " • " + formattedVideoAmount;

app/src/main/java/org/schabi/newpipe/info_list/holder/ChannelMiniInfoItemHolder.java

@@ -1,15 +1,13 @@
 package org.schabi.newpipe.info_list.holder;
 
-import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
-
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
 
 import de.hdodenhof.circleimageview.CircleImageView;
@@ -40,34 +38,23 @@ public class ChannelMiniInfoItemHolder extends InfoItemHolder {
         itemAdditionalDetailView.setText(getDetailLine(item));
 
         itemBuilder.getImageLoader()
-                .displayImage(item.thumbnail_url, itemThumbnailView, ChannelInfoItemHolder.DISPLAY_THUMBNAIL_OPTIONS);
+                .displayImage(item.getThumbnailUrl(),
+                        itemThumbnailView,
+                        ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS);
 
-        itemView.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View view) {
-                if (itemBuilder.getOnChannelSelectedListener() != null) {
-                    itemBuilder.getOnChannelSelectedListener().selected(item);
-                }
+        itemView.setOnClickListener(view -> {
+            if (itemBuilder.getOnChannelSelectedListener() != null) {
+                itemBuilder.getOnChannelSelectedListener().selected(item);
             }
         });
     }
 
     protected String getDetailLine(final ChannelInfoItem item) {
         String details = "";
-        if (item.subscriber_count >= 0) {
-            details += Localization.shortSubscriberCount(itemBuilder.getContext(), item.subscriber_count);
+        if (item.getSubscriberCount() >= 0) {
+            details += Localization.shortSubscriberCount(itemBuilder.getContext(),
+                    item.getSubscriberCount());
         }
         return details;
     }
-
-    /**
-     * Display options for channel thumbnails
-     */
-    public static final DisplayImageOptions DISPLAY_THUMBNAIL_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
-                    .showImageOnLoading(R.drawable.buddy_channel_item)
-                    .showImageForEmptyUri(R.drawable.buddy_channel_item)
-                    .showImageOnFail(R.drawable.buddy_channel_item)
-                    .build();
 }

app/src/main/java/org/schabi/newpipe/info_list/holder/InfoItemHolder.java

@@ -4,8 +4,6 @@ import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.ViewGroup;
 
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
-
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
 
@@ -38,16 +36,4 @@ public abstract class InfoItemHolder extends RecyclerView.ViewHolder {
     }
 
     public abstract void updateFromItem(final InfoItem infoItem);
-
-    /*//////////////////////////////////////////////////////////////////////////
-    // ImageLoaderOptions
-    //////////////////////////////////////////////////////////////////////////*/
-
-    /**
-     * Base display options
-     */
-    public static final DisplayImageOptions BASE_DISPLAY_IMAGE_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cacheInMemory(true)
-                    .build();
 }

app/src/main/java/org/schabi/newpipe/info_list/holder/PlaylistMiniInfoItemHolder.java

@@ -4,12 +4,11 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
-
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.playlist.PlaylistInfoItem;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 
 public class PlaylistMiniInfoItemHolder extends InfoItemHolder {
     public final ImageView itemThumbnailView;
@@ -40,7 +39,8 @@ public class PlaylistMiniInfoItemHolder extends InfoItemHolder {
         itemUploaderView.setText(item.getUploaderName());
 
         itemBuilder.getImageLoader()
-                .displayImage(item.thumbnail_url, itemThumbnailView, DISPLAY_THUMBNAIL_OPTIONS);
+                .displayImage(item.getThumbnailUrl(), itemThumbnailView,
+                		ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS);
 
         itemView.setOnClickListener(view -> {
             if (itemBuilder.getOnPlaylistSelectedListener() != null) {
@@ -56,15 +56,4 @@ public class PlaylistMiniInfoItemHolder extends InfoItemHolder {
             return true;
         });
     }
-
-    /**
-     * Display options for playlist thumbnails
-     */
-    public static final DisplayImageOptions DISPLAY_THUMBNAIL_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
-                    .showImageOnLoading(R.drawable.dummy_thumbnail_playlist)
-                    .showImageForEmptyUri(R.drawable.dummy_thumbnail_playlist)
-                    .showImageOnFail(R.drawable.dummy_thumbnail_playlist)
-                    .build();
 }

app/src/main/java/org/schabi/newpipe/info_list/holder/StreamInfoItemHolder.java

@@ -51,14 +51,14 @@ public class StreamInfoItemHolder extends StreamMiniInfoItemHolder {
 
     private String getStreamInfoDetailLine(final StreamInfoItem infoItem) {
         String viewsAndDate = "";
-        if (infoItem.view_count >= 0) {
-            viewsAndDate = Localization.shortViewCount(itemBuilder.getContext(), infoItem.view_count);
+        if (infoItem.getViewCount() >= 0) {
+            viewsAndDate = Localization.shortViewCount(itemBuilder.getContext(), infoItem.getViewCount());
         }
-        if (!TextUtils.isEmpty(infoItem.upload_date)) {
+        if (!TextUtils.isEmpty(infoItem.getUploadDate())) {
             if (viewsAndDate.isEmpty()) {
-                viewsAndDate = infoItem.upload_date;
+                viewsAndDate = infoItem.getUploadDate();
             } else {
-                viewsAndDate += " • " + infoItem.upload_date;
+                viewsAndDate += " • " + infoItem.getUploadDate();
             }
         }
         return viewsAndDate;

app/src/main/java/org/schabi/newpipe/info_list/holder/StreamMiniInfoItemHolder.java

@@ -6,13 +6,12 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import com.nostra13.universalimageloader.core.DisplayImageOptions;
-
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamType;
 import org.schabi.newpipe.info_list.InfoItemBuilder;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
 
 public class StreamMiniInfoItemHolder extends InfoItemHolder {
@@ -41,15 +40,17 @@ public class StreamMiniInfoItemHolder extends InfoItemHolder {
         final StreamInfoItem item = (StreamInfoItem) infoItem;
 
         itemVideoTitleView.setText(item.getName());
-        itemUploaderView.setText(item.uploader_name);
+        itemUploaderView.setText(item.getUploaderName());
 
-        if (item.duration > 0) {
-            itemDurationView.setText(Localization.getDurationString(item.duration));
-            itemDurationView.setBackgroundColor(ContextCompat.getColor(itemBuilder.getContext(), R.color.duration_background_color));
+        if (item.getDuration() > 0) {
+            itemDurationView.setText(Localization.getDurationString(item.getDuration()));
+            itemDurationView.setBackgroundColor(ContextCompat.getColor(itemBuilder.getContext(),
+                    R.color.duration_background_color));
             itemDurationView.setVisibility(View.VISIBLE);
-        } else if (item.stream_type == StreamType.LIVE_STREAM) {
+        } else if (item.getStreamType() == StreamType.LIVE_STREAM) {
             itemDurationView.setText(R.string.duration_live);
-            itemDurationView.setBackgroundColor(ContextCompat.getColor(itemBuilder.getContext(), R.color.live_duration_background_color));
+            itemDurationView.setBackgroundColor(ContextCompat.getColor(itemBuilder.getContext(),
+                    R.color.live_duration_background_color));
             itemDurationView.setVisibility(View.VISIBLE);
         } else {
             itemDurationView.setVisibility(View.GONE);
@@ -57,25 +58,24 @@ public class StreamMiniInfoItemHolder extends InfoItemHolder {
 
         // Default thumbnail is shown on error, while loading and if the url is empty
         itemBuilder.getImageLoader()
-                .displayImage(item.thumbnail_url, itemThumbnailView, StreamInfoItemHolder.DISPLAY_THUMBNAIL_OPTIONS);
+                .displayImage(item.getThumbnailUrl(),
+                        itemThumbnailView,
+                        ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS);
 
-        itemView.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View view) {
-                if (itemBuilder.getOnStreamSelectedListener() != null) {
-                    itemBuilder.getOnStreamSelectedListener().selected(item);
-                }
+        itemView.setOnClickListener(view -> {
+            if (itemBuilder.getOnStreamSelectedListener() != null) {
+                itemBuilder.getOnStreamSelectedListener().selected(item);
             }
         });
 
-        switch (item.stream_type) {
+        switch (item.getStreamType()) {
             case AUDIO_STREAM:
             case VIDEO_STREAM:
-            case FILE:
-                enableLongClick(item);
-                break;
             case LIVE_STREAM:
             case AUDIO_LIVE_STREAM:
+                enableLongClick(item);
+                break;
+            case FILE:
             case NONE:
             default:
                 disableLongClick();
@@ -85,14 +85,11 @@ public class StreamMiniInfoItemHolder extends InfoItemHolder {
 
     private void enableLongClick(final StreamInfoItem item) {
         itemView.setLongClickable(true);
-        itemView.setOnLongClickListener(new View.OnLongClickListener() {
-            @Override
-            public boolean onLongClick(View view) {
-                if (itemBuilder.getOnStreamSelectedListener() != null) {
-                    itemBuilder.getOnStreamSelectedListener().held(item);
-                }
-                return true;
+        itemView.setOnLongClickListener(view -> {
+            if (itemBuilder.getOnStreamSelectedListener() != null) {
+                itemBuilder.getOnStreamSelectedListener().held(item);
             }
+            return true;
         });
     }
 
@@ -100,15 +97,4 @@ public class StreamMiniInfoItemHolder extends InfoItemHolder {
         itemView.setLongClickable(false);
         itemView.setOnLongClickListener(null);
     }
-
-    /**
-     * Display options for stream thumbnails
-     */
-    public static final DisplayImageOptions DISPLAY_THUMBNAIL_OPTIONS =
-            new DisplayImageOptions.Builder()
-                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
-                    .showImageOnFail(R.drawable.dummy_thumbnail)
-                    .showImageForEmptyUri(R.drawable.dummy_thumbnail)
-                    .showImageOnLoading(R.drawable.dummy_thumbnail)
-                    .build();
 }

app/src/main/java/org/schabi/newpipe/player/BackgroundPlayer.java

@@ -33,6 +33,7 @@ import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.app.NotificationCompat;
 import android.util.Log;
+import android.view.View;
 import android.widget.RemoteViews;
 
 import com.google.android.exoplayer2.PlaybackParameters;
@@ -46,6 +47,7 @@ import org.schabi.newpipe.extractor.stream.AudioStream;
 import org.schabi.newpipe.extractor.stream.StreamInfo;
 import org.schabi.newpipe.player.event.PlayerEventListener;
 import org.schabi.newpipe.player.helper.LockManager;
+import org.schabi.newpipe.player.helper.PlayerHelper;
 import org.schabi.newpipe.playlist.PlayQueueItem;
 import org.schabi.newpipe.util.ListHelper;
 import org.schabi.newpipe.util.NavigationHelper;
@@ -75,6 +77,7 @@ public final class BackgroundPlayer extends Service {
 
     private BasePlayerImpl basePlayerImpl;
     private LockManager lockManager;
+
     /*//////////////////////////////////////////////////////////////////////////
     // Service-Activity Binder
     //////////////////////////////////////////////////////////////////////////*/
@@ -291,15 +294,15 @@ public final class BackgroundPlayer extends Service {
         }
 
         @Override
-        public void onThumbnailReceived(Bitmap thumbnail) {
-            super.onThumbnailReceived(thumbnail);
+        public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
+            super.onLoadingComplete(imageUri, view, loadedImage);
 
-            if (thumbnail != null) {
+            if (loadedImage != null) {
                 // rebuild notification here since remote view does not release bitmaps, causing memory leaks
                 resetNotification();
 
-                if (notRemoteView != null) notRemoteView.setImageViewBitmap(R.id.notificationCover, thumbnail);
-                if (bigNotRemoteView != null) bigNotRemoteView.setImageViewBitmap(R.id.notificationCover, thumbnail);
+                if (notRemoteView != null) notRemoteView.setImageViewBitmap(R.id.notificationCover, loadedImage);
+                if (bigNotRemoteView != null) bigNotRemoteView.setImageViewBitmap(R.id.notificationCover, loadedImage);
 
                 updateNotification(-1);
             }
@@ -378,29 +381,34 @@ public final class BackgroundPlayer extends Service {
         // Playback Listener
         //////////////////////////////////////////////////////////////////////////*/
 
-        @Override
-        public void sync(@NonNull final PlayQueueItem item, @Nullable final StreamInfo info) {
-            if (currentItem == item && currentInfo == info) return;
-            super.sync(item, info);
-
-            resetNotification();
-            updateNotification(-1);
-            updateMetadata();
+        protected void onMetadataChanged(@NonNull final PlayQueueItem item,
+                                         @Nullable final StreamInfo info,
+                                         final int newPlayQueueIndex,
+                                         final boolean hasPlayQueueItemChanged) {
+            if (shouldUpdateOnProgress || hasPlayQueueItemChanged) {
+                resetNotification();
+                updateNotification(-1);
+                updateMetadata();
+            }
         }
 
         @Override
         @Nullable
         public MediaSource sourceOf(final PlayQueueItem item, final StreamInfo info) {
-            final int index = ListHelper.getDefaultAudioFormat(context, info.audio_streams);
-            if (index < 0 || index >= info.audio_streams.size()) return null;
+            final MediaSource liveSource = super.sourceOf(item, info);
+            if (liveSource != null) return liveSource;
 
-            final AudioStream audio = info.audio_streams.get(index);
-            return buildMediaSource(audio.getUrl(), MediaFormat.getSuffixById(audio.getFormatId()));
+            final int index = ListHelper.getDefaultAudioFormat(context, info.getAudioStreams());
+            if (index < 0 || index >= info.getAudioStreams().size()) return null;
+
+            final AudioStream audio = info.getAudioStreams().get(index);
+            return buildMediaSource(audio.getUrl(), PlayerHelper.cacheKeyOf(info, audio),
+                    MediaFormat.getSuffixById(audio.getFormatId()));
         }
 
         @Override
-        public void shutdown() {
-            super.shutdown();
+        public void onPlaybackShutdown() {
+            super.onPlaybackShutdown();
             onClose();
         }
 
@@ -429,7 +437,8 @@ public final class BackgroundPlayer extends Service {
 
         private void updatePlayback() {
             if (activityListener != null && simpleExoPlayer != null && playQueue != null) {
-                activityListener.onPlaybackUpdate(currentState, getRepeatMode(), playQueue.isShuffled(), getPlaybackParameters());
+                activityListener.onPlaybackUpdate(currentState, getRepeatMode(),
+                        playQueue.isShuffled(), getPlaybackParameters());
             }
         }
 
@@ -477,7 +486,7 @@ public final class BackgroundPlayer extends Service {
                     onClose();
                     break;
                 case ACTION_PLAY_PAUSE:
-                    onVideoPlayPause();
+                    onPlayPause();
                     break;
                 case ACTION_REPEAT:
                     onRepeatClicked();

app/src/main/java/org/schabi/newpipe/player/MainVideoPlayer.java

@@ -19,7 +19,6 @@
 
 package org.schabi.newpipe.player;
 
-import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -33,6 +32,7 @@ import android.preference.PreferenceManager;
 import android.provider.Settings;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.helper.ItemTouchHelper;
 import android.util.DisplayMetrics;
@@ -57,29 +57,41 @@ import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.stream.StreamInfo;
 import org.schabi.newpipe.extractor.stream.VideoStream;
 import org.schabi.newpipe.fragments.OnScrollBelowItemsListener;
+import org.schabi.newpipe.player.helper.PlaybackParameterDialog;
 import org.schabi.newpipe.player.helper.PlayerHelper;
+import org.schabi.newpipe.playlist.PlayQueue;
 import org.schabi.newpipe.playlist.PlayQueueItem;
 import org.schabi.newpipe.playlist.PlayQueueItemBuilder;
 import org.schabi.newpipe.playlist.PlayQueueItemHolder;
+import org.schabi.newpipe.playlist.PlayQueueItemTouchCallback;
 import org.schabi.newpipe.util.AnimationUtils;
 import org.schabi.newpipe.util.ListHelper;
 import org.schabi.newpipe.util.NavigationHelper;
 import org.schabi.newpipe.util.PermissionHelper;
+import org.schabi.newpipe.util.StateSaver;
 import org.schabi.newpipe.util.ThemeHelper;
 
 import java.util.List;
+import java.util.Queue;
+import java.util.UUID;
 
+import static org.schabi.newpipe.player.BasePlayer.STATE_PLAYING;
+import static org.schabi.newpipe.player.VideoPlayer.DEFAULT_CONTROLS_DURATION;
+import static org.schabi.newpipe.player.VideoPlayer.DEFAULT_CONTROLS_HIDE_TIME;
+import static org.schabi.newpipe.util.AnimationUtils.Type.SLIDE_AND_ALPHA;
+import static org.schabi.newpipe.util.AnimationUtils.animateRotation;
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
+import static org.schabi.newpipe.util.StateSaver.KEY_SAVED_STATE;
 
 /**
  * Activity Player implementing VideoPlayer
  *
  * @author mauriciocolli
  */
-public final class MainVideoPlayer extends Activity {
+public final class MainVideoPlayer extends AppCompatActivity
+        implements StateSaver.WriteRead, PlaybackParameterDialog.Callback {
     private static final String TAG = ".MainVideoPlayer";
     private static final boolean DEBUG = BasePlayer.DEBUG;
-    private static final String PLAYER_STATE_INTENT = "player_state_intent";
 
     private GestureDetector gestureDetector;
 
@@ -88,6 +100,8 @@ public final class MainVideoPlayer extends Activity {
 
     private SharedPreferences defaultPreferences;
 
+    @Nullable private StateSaver.SavedState savedState;
+
     /*//////////////////////////////////////////////////////////////////////////
     // Activity LifeCycle
     //////////////////////////////////////////////////////////////////////////*/
@@ -101,41 +115,28 @@ public final class MainVideoPlayer extends Activity {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) getWindow().setStatusBarColor(Color.BLACK);
         setVolumeControlStream(AudioManager.STREAM_MUSIC);
 
-        final Intent intent;
-        if (savedInstanceState != null && savedInstanceState.getParcelable(PLAYER_STATE_INTENT) != null) {
-            intent = savedInstanceState.getParcelable(PLAYER_STATE_INTENT);
-        } else {
-            intent = getIntent();
-        }
-
-        if (intent == null) {
-            Toast.makeText(this, R.string.general_error, Toast.LENGTH_SHORT).show();
-            finish();
-            return;
-        }
-
-        showSystemUi();
+        hideSystemUi();
         setContentView(R.layout.activity_main_player);
         playerImpl = new VideoPlayerImpl(this);
         playerImpl.setup(findViewById(android.R.id.content));
-        playerImpl.handleIntent(intent);
+
+        if (savedInstanceState != null && savedInstanceState.get(KEY_SAVED_STATE) != null) {
+            return; // We have saved states, stop here to restore it
+        }
+
+        final Intent intent = getIntent();
+        if (intent != null) {
+            playerImpl.handleIntent(intent);
+        } else {
+            Toast.makeText(this, R.string.general_error, Toast.LENGTH_SHORT).show();
+            finish();
+        }
     }
 
     @Override
-    protected void onSaveInstanceState(Bundle outState) {
-        super.onSaveInstanceState(outState);
-        if (this.playerImpl == null) return;
-
-        final Intent intent = NavigationHelper.getPlayerIntent(
-                getApplicationContext(),
-                this.getClass(),
-                this.playerImpl.getPlayQueue(),
-                this.playerImpl.getRepeatMode(),
-                this.playerImpl.getPlaybackSpeed(),
-                this.playerImpl.getPlaybackPitch(),
-                this.playerImpl.getPlaybackQuality()
-        );
-        outState.putParcelable(PLAYER_STATE_INTENT, intent);
+    protected void onRestoreInstanceState(@NonNull Bundle bundle) {
+        super.onRestoreInstanceState(bundle);
+        savedState = StateSaver.tryToRestore(bundle, this);
     }
 
     @Override
@@ -145,6 +146,23 @@ public final class MainVideoPlayer extends Activity {
         playerImpl.handleIntent(intent);
     }
 
+    @Override
+    protected void onResume() {
+        super.onResume();
+        if (DEBUG) Log.d(TAG, "onResume() called");
+        if (playerImpl.getPlayer() != null && activityPaused && playerImpl.wasPlaying()
+                && !playerImpl.isPlaying()) {
+            playerImpl.onPlay();
+        }
+        activityPaused = false;
+
+        if(globalScreenOrientationLocked()) {
+            boolean lastOrientationWasLandscape
+                    = defaultPreferences.getBoolean(getString(R.string.last_orientation_landscape_key), false);
+            setLandscape(lastOrientationWasLandscape);
+        }
+    }
+
     @Override
     public void onBackPressed() {
         if (DEBUG) Log.d(TAG, "onBackPressed() called");
@@ -152,46 +170,6 @@ public final class MainVideoPlayer extends Activity {
         if (playerImpl.isPlaying()) playerImpl.getPlayer().setPlayWhenReady(false);
     }
 
-    @Override
-    protected void onStop() {
-        super.onStop();
-        if (DEBUG) Log.d(TAG, "onStop() called");
-        activityPaused = true;
-
-        if (playerImpl.getPlayer() != null) {
-            playerImpl.wasPlaying = playerImpl.getPlayer().getPlayWhenReady();
-            playerImpl.setRecovery();
-            playerImpl.destroyPlayer();
-        }
-    }
-
-    @Override
-    protected void onResume() {
-        super.onResume();
-        if (DEBUG) Log.d(TAG, "onResume() called");
-        if (activityPaused) {
-            playerImpl.initPlayer();
-            playerImpl.getPlayPauseButton().setImageResource(R.drawable.ic_play_arrow_white);
-
-            playerImpl.getPlayer().setPlayWhenReady(playerImpl.wasPlaying);
-            playerImpl.initPlayback(playerImpl.playQueue);
-
-            activityPaused = false;
-        }
-        if(globalScreenOrientationLocked()) {
-            boolean lastOrientationWasLandscape
-                    = defaultPreferences.getBoolean(getString(R.string.last_orientation_landscape_key), false);
-            setLandScape(lastOrientationWasLandscape);
-        }
-    }
-
-    @Override
-    protected void onDestroy() {
-        super.onDestroy();
-        if (DEBUG) Log.d(TAG, "onDestroy() called");
-        if (playerImpl != null) playerImpl.destroy();
-    }
-
     @Override
     public void onConfigurationChanged(Configuration newConfig) {
         super.onConfigurationChanged(newConfig);
@@ -202,49 +180,134 @@ public final class MainVideoPlayer extends Activity {
         }
     }
 
+    @Override
+    protected void onPause() {
+        super.onPause();
+        if (DEBUG) Log.d(TAG, "onPause() called");
+
+        if (playerImpl != null && playerImpl.getPlayer() != null && !activityPaused) {
+            playerImpl.wasPlaying = playerImpl.isPlaying();
+            playerImpl.onPause();
+        }
+        activityPaused = true;
+    }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        if (playerImpl == null) return;
+
+        playerImpl.setRecovery();
+        savedState = StateSaver.tryToSave(isChangingConfigurations(), savedState,
+                outState, this);
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        if (DEBUG) Log.d(TAG, "onDestroy() called");
+        if (playerImpl != null) playerImpl.destroy();
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
-    // Utils
+    // State Saving
     //////////////////////////////////////////////////////////////////////////*/
 
+    @Override
+    public String generateSuffix() {
+        return "." + UUID.randomUUID().toString() + ".player";
+    }
+
+    @Override
+    public void writeTo(Queue<Object> objectsToSave) {
+        if (objectsToSave == null) return;
+        objectsToSave.add(playerImpl.getPlayQueue());
+        objectsToSave.add(playerImpl.getRepeatMode());
+        objectsToSave.add(playerImpl.getPlaybackSpeed());
+        objectsToSave.add(playerImpl.getPlaybackPitch());
+        objectsToSave.add(playerImpl.getPlaybackQuality());
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public void readFrom(@NonNull Queue<Object> savedObjects) throws Exception {
+        @NonNull final PlayQueue queue = (PlayQueue) savedObjects.poll();
+        final int repeatMode = (int) savedObjects.poll();
+        final float playbackSpeed = (float) savedObjects.poll();
+        final float playbackPitch = (float) savedObjects.poll();
+        @NonNull final String playbackQuality = (String) savedObjects.poll();
+
+        playerImpl.setPlaybackQuality(playbackQuality);
+        playerImpl.initPlayback(queue, repeatMode, playbackSpeed, playbackPitch);
+
+        StateSaver.onDestroy(savedState);
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // View
+    //////////////////////////////////////////////////////////////////////////*/
+
+    /**
+     * Prior to Kitkat, hiding system ui causes the player view to be overlaid and require two
+     * clicks to get rid of that invisible overlay. By showing the system UI on actions/events,
+     * that overlay is removed and the player view is put to the foreground.
+     *
+     * Post Kitkat, navbar and status bar can be pulled out by swiping the edge of
+     * screen, therefore, we can do nothing or hide the UI on actions/events.
+     * */
+    private void changeSystemUi() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT) {
+            showSystemUi();
+        } else {
+            hideSystemUi();
+        }
+    }
+
     private void showSystemUi() {
         if (DEBUG) Log.d(TAG, "showSystemUi() called");
         if (playerImpl != null && playerImpl.queueVisible) return;
+
+        final int visibility;
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
-            getWindow().getDecorView().setSystemUiVisibility(
-                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
-                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
-                            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
-            );
-        } else getWindow().getDecorView().setSystemUiVisibility(0);
+            visibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                    | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
+        } else {
+            visibility = View.STATUS_BAR_VISIBLE;
+        }
+        getWindow().getDecorView().setSystemUiVisibility(visibility);
         getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
     }
 
     private void hideSystemUi() {
         if (DEBUG) Log.d(TAG, "hideSystemUi() called");
-        if (android.os.Build.VERSION.SDK_INT >= 16) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
             int visibility = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
-                    | View.SYSTEM_UI_FLAG_FULLSCREEN
-                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                     | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
-                    | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
-            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) visibility |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
+                    | View.SYSTEM_UI_FLAG_FULLSCREEN
+                    | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
+                visibility |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
+            }
             getWindow().getDecorView().setSystemUiVisibility(visibility);
         }
-        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
+        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
+                WindowManager.LayoutParams.FLAG_FULLSCREEN);
     }
 
     private void toggleOrientation() {
-        setLandScape(!isLandScape());
+        setLandscape(!isLandscape());
         defaultPreferences.edit()
-                .putBoolean(getString(R.string.last_orientation_landscape_key), !isLandScape())
+                .putBoolean(getString(R.string.last_orientation_landscape_key), !isLandscape())
                 .apply();
     }
 
-    private boolean isLandScape() {
+    private boolean isLandscape() {
         return getResources().getDisplayMetrics().heightPixels < getResources().getDisplayMetrics().widthPixels;
     }
 
-    private void setLandScape(boolean v) {
+    private void setLandscape(boolean v) {
         setRequestedOrientation(v
                 ? ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE
                 : ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);
@@ -279,6 +342,15 @@ public final class MainVideoPlayer extends Activity {
         }
     }
 
+    ////////////////////////////////////////////////////////////////////////////
+    // Playback Parameters Listener
+    ////////////////////////////////////////////////////////////////////////////
+
+    @Override
+    public void onPlaybackParameterChanged(float playbackTempo, float playbackPitch) {
+        if (playerImpl != null) playerImpl.setPlaybackParameters(playbackTempo, playbackPitch);
+    }
+
     ///////////////////////////////////////////////////////////////////////////
 
     @SuppressWarnings({"unused", "WeakerAccess"})
@@ -307,6 +379,7 @@ public final class MainVideoPlayer extends Activity {
         private ImageButton switchPopupButton;
         private ImageButton switchBackgroundButton;
 
+        private RelativeLayout windowRootLayout;
         private View secondaryControls;
 
         VideoPlayerImpl(final Context context) {
@@ -334,6 +407,19 @@ public final class MainVideoPlayer extends Activity {
             this.switchBackgroundButton = rootView.findViewById(R.id.switchBackground);
             this.switchPopupButton = rootView.findViewById(R.id.switchPopup);
 
+            this.queueLayout = findViewById(R.id.playQueuePanel);
+            this.itemsListCloseButton = findViewById(R.id.playQueueClose);
+            this.itemsList = findViewById(R.id.playQueue);
+
+            this.windowRootLayout = rootView.findViewById(R.id.playbackWindowRoot);
+            // Prior to Kitkat, there is no way of setting translucent navbar programmatically.
+            // Thus, fit system windows is opted instead.
+            // See https://stackoverflow.com/questions/29069070/completely-transparent-status-bar-and-navigation-bar-on-lollipop
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
+                windowRootLayout.setFitsSystemWindows(false);
+                windowRootLayout.invalidate();
+            }
+
             titleTextView.setSelected(true);
             channelTextView.setSelected(true);
 
@@ -391,31 +477,32 @@ public final class MainVideoPlayer extends Activity {
             updatePlaybackButtons();
         }
 
-        /*//////////////////////////////////////////////////////////////////////////
-        // Playback Listener
-        //////////////////////////////////////////////////////////////////////////*/
-
-        @Override
-        public void shutdown() {
-            super.shutdown();
-            finish();
-        }
-
-        @Override
-        public void sync(@NonNull final PlayQueueItem item, @Nullable final StreamInfo info) {
-            super.sync(item, info);
-            titleTextView.setText(getVideoTitle());
-            channelTextView.setText(getUploaderName());
-
-            //playPauseButton.setImageResource(R.drawable.ic_pause_white);
-        }
-
         @Override
         public void onShuffleClicked() {
             super.onShuffleClicked();
             updatePlaybackButtons();
         }
 
+        /*//////////////////////////////////////////////////////////////////////////
+        // Playback Listener
+        //////////////////////////////////////////////////////////////////////////*/
+
+        protected void onMetadataChanged(@NonNull final PlayQueueItem item,
+                                         @Nullable final StreamInfo info,
+                                         final int newPlayQueueIndex,
+                                         final boolean hasPlayQueueItemChanged) {
+            super.onMetadataChanged(item, info, newPlayQueueIndex, false);
+
+            titleTextView.setText(getVideoTitle());
+            channelTextView.setText(getUploaderName());
+        }
+
+        @Override
+        public void onPlaybackShutdown() {
+            super.onPlaybackShutdown();
+            finish();
+        }
+
         /*//////////////////////////////////////////////////////////////////////////
         // Player Overrides
         //////////////////////////////////////////////////////////////////////////*/
@@ -475,7 +562,7 @@ public final class MainVideoPlayer extends Activity {
         public void onClick(View v) {
             super.onClick(v);
             if (v.getId() == playPauseButton.getId()) {
-                onVideoPlayPause();
+                onPlayPause();
 
             } else if (v.getId() == playPreviousButton.getId()) {
                 onPlayPrevious();
@@ -508,9 +595,9 @@ public final class MainVideoPlayer extends Activity {
 
             if (getCurrentState() != STATE_COMPLETED) {
                 getControlsVisibilityHandler().removeCallbacksAndMessages(null);
-                animateView(getControlsRoot(), true, 300, 0, () -> {
+                animateView(getControlsRoot(), true, DEFAULT_CONTROLS_DURATION, 0, () -> {
                     if (getCurrentState() == STATE_PLAYING && !isSomePopupMenuVisible()) {
-                        hideControls(300, DEFAULT_CONTROLS_HIDE_TIME);
+                        hideControls(DEFAULT_CONTROLS_DURATION, DEFAULT_CONTROLS_HIDE_TIME);
                     }
                 });
             }
@@ -524,29 +611,28 @@ public final class MainVideoPlayer extends Activity {
             updatePlaybackButtons();
 
             getControlsRoot().setVisibility(View.INVISIBLE);
-            queueLayout.setVisibility(View.VISIBLE);
+            animateView(queueLayout, SLIDE_AND_ALPHA, /*visible=*/true,
+                    DEFAULT_CONTROLS_DURATION);
 
             itemsList.scrollToPosition(playQueue.getIndex());
         }
 
         private void onQueueClosed() {
-            queueLayout.setVisibility(View.GONE);
+            animateView(queueLayout, SLIDE_AND_ALPHA, /*visible=*/false,
+                    DEFAULT_CONTROLS_DURATION);
             queueVisible = false;
         }
 
         private void onMoreOptionsClicked() {
             if (DEBUG) Log.d(TAG, "onMoreOptionsClicked() called");
 
-            if (secondaryControls.getVisibility() == View.VISIBLE) {
-                moreOptionsButton.setImageDrawable(getResources().getDrawable(
-                        R.drawable.ic_expand_more_white_24dp));
-                animateView(secondaryControls, false, 200);
-            } else {
-                moreOptionsButton.setImageDrawable(getResources().getDrawable(
-                        R.drawable.ic_expand_less_white_24dp));
-                animateView(secondaryControls, true, 200);
-            }
-            showControls(300);
+            final boolean isMoreControlsVisible = secondaryControls.getVisibility() == View.VISIBLE;
+
+            animateRotation(moreOptionsButton, DEFAULT_CONTROLS_DURATION,
+                    isMoreControlsVisible ? 0 : 180);
+            animateView(secondaryControls, SLIDE_AND_ALPHA, !isMoreControlsVisible,
+                    DEFAULT_CONTROLS_DURATION);
+            showControls(DEFAULT_CONTROLS_DURATION);
         }
 
         private void onScreenRotationClicked() {
@@ -555,18 +641,23 @@ public final class MainVideoPlayer extends Activity {
             showControlsThenHide();
         }
 
+        @Override
+        public void onPlaybackSpeedClicked() {
+            PlaybackParameterDialog.newInstance(getPlaybackSpeed(), getPlaybackPitch())
+                    .show(getSupportFragmentManager(), TAG);
+        }
+
         @Override
         public void onStopTrackingTouch(SeekBar seekBar) {
             super.onStopTrackingTouch(seekBar);
-            if (wasPlaying()) {
-                hideControls(100, 0);
-            }
+            if (wasPlaying()) showControlsThenHide();
         }
 
         @Override
         public void onDismiss(PopupMenu menu) {
             super.onDismiss(menu);
-            if (isPlaying()) hideControls(300, 0);
+            if (isPlaying()) hideControls(DEFAULT_CONTROLS_DURATION, 0);
+            hideSystemUi();
         }
 
         @Override
@@ -624,7 +715,7 @@ public final class MainVideoPlayer extends Activity {
                 playPauseButton.setImageResource(R.drawable.ic_pause_white);
                 animatePlayButtons(true, 200);
             });
-            showSystemUi();
+
             getRootView().setKeepScreenOn(true);
         }
 
@@ -636,7 +727,7 @@ public final class MainVideoPlayer extends Activity {
                 animatePlayButtons(true, 200);
             });
 
-            showSystemUi();
+            changeSystemUi();
             getRootView().setKeepScreenOn(false);
         }
 
@@ -650,10 +741,9 @@ public final class MainVideoPlayer extends Activity {
 
         @Override
         public void onCompleted() {
-            showSystemUi();
             animateView(playPauseButton, AnimationUtils.Type.SCALE_AND_ALPHA, false, 0, 0, () -> {
                 playPauseButton.setImageResource(R.drawable.ic_replay_white);
-                animatePlayButtons(true, 300);
+                animatePlayButtons(true, DEFAULT_CONTROLS_DURATION);
             });
 
             getRootView().setKeepScreenOn(false);
@@ -683,8 +773,9 @@ public final class MainVideoPlayer extends Activity {
             if (DEBUG) Log.d(TAG, "hideControls() called with: delay = [" + delay + "]");
             getControlsVisibilityHandler().removeCallbacksAndMessages(null);
             getControlsVisibilityHandler().postDelayed(() ->
-                    animateView(getControlsRoot(), false, duration, 0, MainVideoPlayer.this::hideSystemUi),
-                    delay
+                    animateView(getControlsRoot(), false, duration, 0,
+                            MainVideoPlayer.this::hideSystemUi),
+                    /*delayMillis=*/delay
             );
         }
 
@@ -697,11 +788,6 @@ public final class MainVideoPlayer extends Activity {
         }
 
         private void buildQueue() {
-            queueLayout = findViewById(R.id.playQueuePanel);
-
-            itemsListCloseButton = findViewById(R.id.playQueueClose);
-
-            itemsList = findViewById(R.id.playQueue);
             itemsList.setAdapter(playQueueAdapter);
             itemsList.setClickable(true);
             itemsList.setLongClickable(true);
@@ -731,31 +817,11 @@ public final class MainVideoPlayer extends Activity {
         }
 
         private ItemTouchHelper.SimpleCallback getItemTouchCallback() {
-            return new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN, 0) {
+            return new PlayQueueItemTouchCallback() {
                 @Override
-                public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) {
-                    if (source.getItemViewType() != target.getItemViewType()) {
-                        return false;
-                    }
-
-                    final int sourceIndex = source.getLayoutPosition();
-                    final int targetIndex = target.getLayoutPosition();
-                    playQueue.move(sourceIndex, targetIndex);
-                    return true;
+                public void onMove(int sourceIndex, int targetIndex) {
+                    if (playQueue != null) playQueue.move(sourceIndex, targetIndex);
                 }
-
-                @Override
-                public boolean isLongPressDragEnabled() {
-                    return false;
-                }
-
-                @Override
-                public boolean isItemViewSwipeEnabled() {
-                    return false;
-                }
-
-                @Override
-                public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {}
             };
         }
 
@@ -830,14 +896,22 @@ public final class MainVideoPlayer extends Activity {
             if (DEBUG) Log.d(TAG, "onSingleTapConfirmed() called with: e = [" + e + "]");
             if (playerImpl.getCurrentState() == BasePlayer.STATE_BLOCKED) return true;
 
-            if (playerImpl.isControlsVisible()) playerImpl.hideControls(150, 0);
-            else {
+            if (playerImpl.isControlsVisible()) {
+                playerImpl.hideControls(150, 0);
+            } else {
                 playerImpl.showControlsThenHide();
-                showSystemUi();
+                changeSystemUi();
             }
             return true;
         }
 
+        @Override
+        public boolean onDown(MotionEvent e) {
+            if (DEBUG) Log.d(TAG, "onDown() called with: e = [" + e + "]");
+
+            return super.onDown(e);
+        }
+
         private final boolean isPlayerGestureEnabled = PlayerHelper.isPlayerGestureEnabled(getApplicationContext());
 
         private final float stepsBrightness = 15, stepBrightness = (1f / stepsBrightness), minBrightness = .01f;
@@ -916,11 +990,15 @@ public final class MainVideoPlayer extends Activity {
             eventsNum = 0;
             /* if (playerImpl.getVolumeTextView().getVisibility() == View.VISIBLE) playerImpl.getVolumeTextView().setVisibility(View.GONE);
             if (playerImpl.getBrightnessTextView().getVisibility() == View.VISIBLE) playerImpl.getBrightnessTextView().setVisibility(View.GONE);*/
-            if (playerImpl.getVolumeTextView().getVisibility() == View.VISIBLE) animateView(playerImpl.getVolumeTextView(), false, 200, 200);
-            if (playerImpl.getBrightnessTextView().getVisibility() == View.VISIBLE) animateView(playerImpl.getBrightnessTextView(), false, 200, 200);
+            if (playerImpl.getVolumeTextView().getVisibility() == View.VISIBLE) {
+                animateView(playerImpl.getVolumeTextView(), false, 200, 200);
+            }
+            if (playerImpl.getBrightnessTextView().getVisibility() == View.VISIBLE) {
+                animateView(playerImpl.getBrightnessTextView(), false, 200, 200);
+            }
 
-            if (playerImpl.isControlsVisible() && playerImpl.getCurrentState() == BasePlayer.STATE_PLAYING) {
-                playerImpl.hideControls(300, VideoPlayer.DEFAULT_CONTROLS_HIDE_TIME);
+            if (playerImpl.isControlsVisible() && playerImpl.getCurrentState() == STATE_PLAYING) {
+                playerImpl.hideControls(DEFAULT_CONTROLS_DURATION, DEFAULT_CONTROLS_HIDE_TIME);
             }
         }
 

app/src/main/java/org/schabi/newpipe/player/PopupVideoPlayer.java

@@ -70,6 +70,9 @@ import org.schabi.newpipe.util.ThemeHelper;
 
 import java.util.List;
 
+import static org.schabi.newpipe.player.BasePlayer.STATE_PLAYING;
+import static org.schabi.newpipe.player.VideoPlayer.DEFAULT_CONTROLS_DURATION;
+import static org.schabi.newpipe.player.VideoPlayer.DEFAULT_CONTROLS_HIDE_TIME;
 import static org.schabi.newpipe.player.helper.PlayerHelper.isUsingOldPlayer;
 import static org.schabi.newpipe.util.AnimationUtils.animateView;
 
@@ -419,13 +422,15 @@ public final class PopupVideoPlayer extends Service {
         }
 
         @Override
-        public void onThumbnailReceived(Bitmap thumbnail) {
-            super.onThumbnailReceived(thumbnail);
-            if (thumbnail != null) {
+        public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
+            super.onLoadingComplete(imageUri, view, loadedImage);
+            if (loadedImage != null) {
                 // rebuild notification here since remote view does not release bitmaps, causing memory leaks
                 notBuilder = createNotification();
 
-                if (notRemoteView != null) notRemoteView.setImageViewBitmap(R.id.notificationCover, thumbnail);
+                if (notRemoteView != null) {
+                    notRemoteView.setImageViewBitmap(R.id.notificationCover, loadedImage);
+                }
 
                 updateNotification(-1);
             }
@@ -533,7 +538,8 @@ public final class PopupVideoPlayer extends Service {
 
         private void updatePlayback() {
             if (activityListener != null && simpleExoPlayer != null && playQueue != null) {
-                activityListener.onPlaybackUpdate(currentState, getRepeatMode(), playQueue.isShuffled(), simpleExoPlayer.getPlaybackParameters());
+                activityListener.onPlaybackUpdate(currentState, getRepeatMode(),
+                        playQueue.isShuffled(), simpleExoPlayer.getPlaybackParameters());
             }
         }
 
@@ -572,16 +578,17 @@ public final class PopupVideoPlayer extends Service {
         // Playback Listener
         //////////////////////////////////////////////////////////////////////////*/
 
-        @Override
-        public void sync(@NonNull PlayQueueItem item, @Nullable StreamInfo info) {
-            if (currentItem == item && currentInfo == info) return;
-            super.sync(item, info);
+        protected void onMetadataChanged(@NonNull final PlayQueueItem item,
+                                         @Nullable final StreamInfo info,
+                                         final int newPlayQueueIndex,
+                                         final boolean hasPlayQueueItemChanged) {
+            super.onMetadataChanged(item, info, newPlayQueueIndex, false);
             updateMetadata();
         }
 
         @Override
-        public void shutdown() {
-            super.shutdown();
+        public void onPlaybackShutdown() {
+            super.onPlaybackShutdown();
             onClose();
         }
 
@@ -611,7 +618,7 @@ public final class PopupVideoPlayer extends Service {
                     onClose();
                     break;
                 case ACTION_PLAY_PAUSE:
-                    onVideoPlayPause();
+                    onPlayPause();
                     break;
                 case ACTION_REPEAT:
                     onRepeatClicked();
@@ -646,6 +653,8 @@ public final class PopupVideoPlayer extends Service {
             super.onPlaying();
             updateNotification(R.drawable.ic_pause_white);
             lockManager.acquireWifiAndCpu();
+
+            hideControls(DEFAULT_CONTROLS_DURATION, DEFAULT_CONTROLS_HIDE_TIME);
         }
 
         @Override
@@ -707,7 +716,7 @@ public final class PopupVideoPlayer extends Service {
         public boolean onDoubleTap(MotionEvent e) {
             if (DEBUG)
                 Log.d(TAG, "onDoubleTap() called with: e = [" + e + "]" + "rawXy = " + e.getRawX() + ", " + e.getRawY() + ", xy = " + e.getX() + ", " + e.getY());
-            if (playerImpl == null || !playerImpl.isPlaying() || !playerImpl.isPlayerReady()) return false;
+            if (playerImpl == null || !playerImpl.isPlaying()) return false;
 
             if (e.getX() > popupWidth / 2) {
                 playerImpl.onFastForward();
@@ -722,7 +731,7 @@ public final class PopupVideoPlayer extends Service {
         public boolean onSingleTapConfirmed(MotionEvent e) {
             if (DEBUG) Log.d(TAG, "onSingleTapConfirmed() called with: e = [" + e + "]");
             if (playerImpl == null || playerImpl.getPlayer() == null) return false;
-            playerImpl.onVideoPlayPause();
+            playerImpl.onPlayPause();
             return true;
         }
 
@@ -778,8 +787,8 @@ public final class PopupVideoPlayer extends Service {
         private void onScrollEnd() {
             if (DEBUG) Log.d(TAG, "onScrollEnd() called");
             if (playerImpl == null) return;
-            if (playerImpl.isControlsVisible() && playerImpl.getCurrentState() == BasePlayer.STATE_PLAYING) {
-                playerImpl.hideControls(300, VideoPlayer.DEFAULT_CONTROLS_HIDE_TIME);
+            if (playerImpl.isControlsVisible() && playerImpl.getCurrentState() == STATE_PLAYING) {
+                playerImpl.hideControls(DEFAULT_CONTROLS_DURATION, DEFAULT_CONTROLS_HIDE_TIME);
             }
         }
 

app/src/main/java/org/schabi/newpipe/player/ServicePlayerActivity.java

@@ -31,9 +31,11 @@ import org.schabi.newpipe.extractor.stream.StreamInfo;
 import org.schabi.newpipe.fragments.OnScrollBelowItemsListener;
 import org.schabi.newpipe.fragments.local.dialog.PlaylistAppendDialog;
 import org.schabi.newpipe.player.event.PlayerEventListener;
+import org.schabi.newpipe.player.helper.PlaybackParameterDialog;
 import org.schabi.newpipe.playlist.PlayQueueItem;
 import org.schabi.newpipe.playlist.PlayQueueItemBuilder;
 import org.schabi.newpipe.playlist.PlayQueueItemHolder;
+import org.schabi.newpipe.playlist.PlayQueueItemTouchCallback;
 import org.schabi.newpipe.util.Localization;
 import org.schabi.newpipe.util.NavigationHelper;
 import org.schabi.newpipe.util.ThemeHelper;
@@ -42,7 +44,8 @@ import static org.schabi.newpipe.player.helper.PlayerHelper.formatPitch;
 import static org.schabi.newpipe.player.helper.PlayerHelper.formatSpeed;
 
 public abstract class ServicePlayerActivity extends AppCompatActivity
-        implements PlayerEventListener, SeekBar.OnSeekBarChangeListener, View.OnClickListener {
+        implements PlayerEventListener, SeekBar.OnSeekBarChangeListener,
+        View.OnClickListener, PlaybackParameterDialog.Callback {
 
     private boolean serviceBound;
     private ServiceConnection serviceConnection;
@@ -56,14 +59,9 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
     ////////////////////////////////////////////////////////////////////////////
 
     private static final int RECYCLER_ITEM_POPUP_MENU_GROUP_ID = 47;
-    private static final int PLAYBACK_SPEED_POPUP_MENU_GROUP_ID = 61;
-    private static final int PLAYBACK_PITCH_POPUP_MENU_GROUP_ID = 97;
 
     private static final int SMOOTH_SCROLL_MAXIMUM_DISTANCE = 80;
 
-    private static final int MINIMUM_INITIAL_DRAG_VELOCITY = 10;
-    private static final int MAXIMUM_INITIAL_DRAG_VELOCITY = 25;
-
     private View rootView;
 
     private RecyclerView itemsList;
@@ -76,6 +74,7 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
     private SeekBar progressSeekBar;
     private TextView progressCurrentTime;
     private TextView progressEndTime;
+    private TextView progressLiveSync;
     private TextView seekDisplay;
 
     private ImageButton repeatButton;
@@ -86,9 +85,7 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
     private ProgressBar progressBar;
 
     private TextView playbackSpeedButton;
-    private PopupMenu playbackSpeedPopupMenu;
     private TextView playbackPitchButton;
-    private PopupMenu playbackPitchPopupMenu;
 
     ////////////////////////////////////////////////////////////////////////////
     // Abstracts
@@ -294,9 +291,11 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
         progressCurrentTime = rootView.findViewById(R.id.current_time);
         progressSeekBar = rootView.findViewById(R.id.seek_bar);
         progressEndTime = rootView.findViewById(R.id.end_time);
+        progressLiveSync = rootView.findViewById(R.id.live_sync);
         seekDisplay = rootView.findViewById(R.id.seek_display);
 
         progressSeekBar.setOnSeekBarChangeListener(this);
+        progressLiveSync.setOnClickListener(this);
     }
 
     private void buildControls() {
@@ -316,45 +315,6 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
         shuffleButton.setOnClickListener(this);
         playbackSpeedButton.setOnClickListener(this);
         playbackPitchButton.setOnClickListener(this);
-
-        playbackSpeedPopupMenu = new PopupMenu(this, playbackSpeedButton);
-        playbackPitchPopupMenu = new PopupMenu(this, playbackPitchButton);
-        buildPlaybackSpeedMenu();
-        buildPlaybackPitchMenu();
-    }
-
-    private void buildPlaybackSpeedMenu() {
-        if (playbackSpeedPopupMenu == null) return;
-
-        playbackSpeedPopupMenu.getMenu().removeGroup(PLAYBACK_SPEED_POPUP_MENU_GROUP_ID);
-        for (int i = 0; i < BasePlayer.PLAYBACK_SPEEDS.length; i++) {
-            final float playbackSpeed = BasePlayer.PLAYBACK_SPEEDS[i];
-            final String formattedSpeed = formatSpeed(playbackSpeed);
-            final MenuItem item = playbackSpeedPopupMenu.getMenu().add(PLAYBACK_SPEED_POPUP_MENU_GROUP_ID, i, Menu.NONE, formattedSpeed);
-            item.setOnMenuItemClickListener(menuItem -> {
-                if (player == null) return false;
-
-                player.setPlaybackSpeed(playbackSpeed);
-                return true;
-            });
-        }
-    }
-
-    private void buildPlaybackPitchMenu() {
-        if (playbackPitchPopupMenu == null) return;
-
-        playbackPitchPopupMenu.getMenu().removeGroup(PLAYBACK_PITCH_POPUP_MENU_GROUP_ID);
-        for (int i = 0; i < BasePlayer.PLAYBACK_PITCHES.length; i++) {
-            final float playbackPitch = BasePlayer.PLAYBACK_PITCHES[i];
-            final String formattedPitch = formatPitch(playbackPitch);
-            final MenuItem item = playbackPitchPopupMenu.getMenu().add(PLAYBACK_PITCH_POPUP_MENU_GROUP_ID, i, Menu.NONE, formattedPitch);
-            item.setOnMenuItemClickListener(menuItem -> {
-                if (player == null) return false;
-
-                player.setPlaybackPitch(playbackPitch);
-                return true;
-            });
-        }
     }
 
     private void buildItemPopupMenu(final PlayQueueItem item, final View view) {
@@ -395,43 +355,11 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
     }
 
     private ItemTouchHelper.SimpleCallback getItemTouchCallback() {
-        return new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN, 0) {
+        return new PlayQueueItemTouchCallback() {
             @Override
-            public int interpolateOutOfBoundsScroll(RecyclerView recyclerView, int viewSize,
-                                                    int viewSizeOutOfBounds, int totalSize,
-                                                    long msSinceStartScroll) {
-                final int standardSpeed = super.interpolateOutOfBoundsScroll(recyclerView, viewSize,
-                        viewSizeOutOfBounds, totalSize, msSinceStartScroll);
-                final int clampedAbsVelocity = Math.max(MINIMUM_INITIAL_DRAG_VELOCITY,
-                        Math.min(Math.abs(standardSpeed), MAXIMUM_INITIAL_DRAG_VELOCITY));
-                return clampedAbsVelocity * (int) Math.signum(viewSizeOutOfBounds);
-            }
-
-            @Override
-            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder source,
-                                  RecyclerView.ViewHolder target) {
-                if (source.getItemViewType() != target.getItemViewType()) {
-                    return false;
-                }
-
-                final int sourceIndex = source.getLayoutPosition();
-                final int targetIndex = target.getLayoutPosition();
+            public void onMove(int sourceIndex, int targetIndex) {
                 if (player != null) player.getPlayQueue().move(sourceIndex, targetIndex);
-                return true;
             }
-
-            @Override
-            public boolean isLongPressDragEnabled() {
-                return false;
-            }
-
-            @Override
-            public boolean isItemViewSwipeEnabled() {
-                return false;
-            }
-
-            @Override
-            public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {}
         };
     }
 
@@ -496,7 +424,7 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
             player.onPlayPrevious();
 
         } else if (view.getId() == playPauseButton.getId()) {
-            player.onVideoPlayPause();
+            player.onPlayPause();
 
         } else if (view.getId() == forwardButton.getId()) {
             player.onPlayNext();
@@ -505,17 +433,35 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
             player.onShuffleClicked();
 
         } else if (view.getId() == playbackSpeedButton.getId()) {
-            playbackSpeedPopupMenu.show();
+            openPlaybackParameterDialog();
 
         } else if (view.getId() == playbackPitchButton.getId()) {
-            playbackPitchPopupMenu.show();
+            openPlaybackParameterDialog();
 
         } else if (view.getId() == metadata.getId()) {
             scrollToSelected();
 
+        } else if (view.getId() == progressLiveSync.getId()) {
+            player.seekToDefault();
+
         }
     }
 
+    ////////////////////////////////////////////////////////////////////////////
+    // Playback Parameters
+    ////////////////////////////////////////////////////////////////////////////
+
+    private void openPlaybackParameterDialog() {
+        if (player == null) return;
+        PlaybackParameterDialog.newInstance(player.getPlaybackSpeed(),
+                player.getPlaybackPitch()).show(getSupportFragmentManager(), getTag());
+    }
+
+    @Override
+    public void onPlaybackParameterChanged(float playbackTempo, float playbackPitch) {
+        if (player != null) player.setPlaybackParameters(playbackTempo, playbackPitch);
+    }
+
     ////////////////////////////////////////////////////////////////////////////
     // Seekbar Listener
     ////////////////////////////////////////////////////////////////////////////
@@ -537,7 +483,7 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
 
     @Override
     public void onStopTrackingTouch(SeekBar seekBar) {
-        if (player != null) player.simpleExoPlayer.seekTo(seekBar.getProgress());
+        if (player != null) player.seekTo(seekBar.getProgress());
         seekDisplay.setVisibility(View.GONE);
         seeking = false;
     }
@@ -567,13 +513,30 @@ public abstract class ServicePlayerActivity extends AppCompatActivity
             progressSeekBar.setProgress(currentProgress);
             progressCurrentTime.setText(Localization.getDurationString(currentProgress / 1000));
         }
+
+        if (player != null) {
+            progressLiveSync.setClickable(!player.isLiveEdge());
+        }
     }
 
     @Override
     public void onMetadataUpdate(StreamInfo info) {
         if (info != null) {
             metadataTitle.setText(info.getName());
-            metadataArtist.setText(info.uploader_name);
+            metadataArtist.setText(info.getUploaderName());
+
+            progressEndTime.setVisibility(View.GONE);
+            progressLiveSync.setVisibility(View.GONE);
+            switch (info.getStreamType()) {
+                case LIVE_STREAM:
+                case AUDIO_LIVE_STREAM:
+                    progressLiveSync.setVisibility(View.VISIBLE);
+                    break;
+                default:
+                    progressEndTime.setVisibility(View.VISIBLE);
+                    break;
+            }
+
             scrollToSelected();
         }
     }

app/src/main/java/org/schabi/newpipe/player/VideoPlayer.java

@@ -49,22 +49,23 @@ import android.widget.TextView;
 
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
-import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.source.MediaSource;
 import com.google.android.exoplayer2.source.MergingMediaSource;
-import com.google.android.exoplayer2.source.SingleSampleMediaSource;
 import com.google.android.exoplayer2.source.TrackGroup;
 import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.ui.AspectRatioFrameLayout;
 import com.google.android.exoplayer2.ui.SubtitleView;
+import com.google.android.exoplayer2.video.VideoListener;
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.MediaFormat;
 import org.schabi.newpipe.extractor.Subtitles;
 import org.schabi.newpipe.extractor.stream.AudioStream;
 import org.schabi.newpipe.extractor.stream.StreamInfo;
+import org.schabi.newpipe.extractor.stream.StreamType;
 import org.schabi.newpipe.extractor.stream.VideoStream;
 import org.schabi.newpipe.player.helper.PlayerHelper;
 import org.schabi.newpipe.playlist.PlayQueueItem;
@@ -87,7 +88,7 @@ import static org.schabi.newpipe.util.AnimationUtils.animateView;
  */
 @SuppressWarnings({"WeakerAccess", "unused"})
 public abstract class VideoPlayer extends BasePlayer
-        implements SimpleExoPlayer.VideoListener,
+        implements VideoListener,
         SeekBar.OnSeekBarChangeListener,
         View.OnClickListener,
         Player.EventListener,
@@ -101,6 +102,7 @@ public abstract class VideoPlayer extends BasePlayer
     //////////////////////////////////////////////////////////////////////////*/
 
     protected static final int RENDERER_UNAVAILABLE = -1;
+    public static final int DEFAULT_CONTROLS_DURATION = 300; // 300 millis
     public static final int DEFAULT_CONTROLS_HIDE_TIME = 2000;  // 2 Seconds
 
     private ArrayList<VideoStream> availableStreams;
@@ -131,6 +133,7 @@ public abstract class VideoPlayer extends BasePlayer
     private SeekBar playbackSeekBar;
     private TextView playbackCurrentTime;
     private TextView playbackEndTime;
+    private TextView playbackLiveSync;
     private TextView playbackSpeedTextView;
 
     private View topControlsRoot;
@@ -159,7 +162,6 @@ public abstract class VideoPlayer extends BasePlayer
     public VideoPlayer(String debugTag, Context context) {
         super(context);
         this.TAG = debugTag;
-        this.context = context;
     }
 
     public void setup(View rootView) {
@@ -180,6 +182,7 @@ public abstract class VideoPlayer extends BasePlayer
         this.playbackSeekBar = rootView.findViewById(R.id.playbackSeekBar);
         this.playbackCurrentTime = rootView.findViewById(R.id.playbackCurrentTime);
         this.playbackEndTime = rootView.findViewById(R.id.playbackEndTime);
+        this.playbackLiveSync = rootView.findViewById(R.id.playbackLiveSync);
         this.playbackSpeedTextView = rootView.findViewById(R.id.playbackSpeed);
         this.bottomControlsRoot = rootView.findViewById(R.id.bottomControls);
         this.topControlsRoot = rootView.findViewById(R.id.topControls);
@@ -221,6 +224,7 @@ public abstract class VideoPlayer extends BasePlayer
         qualityTextView.setOnClickListener(this);
         captionTextView.setOnClickListener(this);
         resizeView.setOnClickListener(this);
+        playbackLiveSync.setOnClickListener(this);
     }
 
     @Override
@@ -261,7 +265,8 @@ public abstract class VideoPlayer extends BasePlayer
         qualityPopupMenu.getMenu().removeGroup(qualityPopupMenuGroupId);
         for (int i = 0; i < availableStreams.size(); i++) {
             VideoStream videoStream = availableStreams.get(i);
-            qualityPopupMenu.getMenu().add(qualityPopupMenuGroupId, i, Menu.NONE, MediaFormat.getNameById(videoStream.format) + " " + videoStream.resolution);
+            qualityPopupMenu.getMenu().add(qualityPopupMenuGroupId, i, Menu.NONE,
+                    MediaFormat.getNameById(videoStream.getFormatId()) + " " + videoStream.resolution);
         }
         if (getSelectedVideoStream() != null) {
             qualityTextView.setText(getSelectedVideoStream().resolution);
@@ -305,8 +310,7 @@ public abstract class VideoPlayer extends BasePlayer
             captionItem.setOnMenuItemClickListener(menuItem -> {
                 final int textRendererIndex = getRendererIndex(C.TRACK_TYPE_TEXT);
                 if (trackSelector != null && textRendererIndex != RENDERER_UNAVAILABLE) {
-                    trackSelector.setParameters(trackSelector.getParameters()
-                            .withPreferredTextLanguage(captionLanguage));
+                    trackSelector.setPreferredTextLanguage(captionLanguage);
                     trackSelector.setRendererDisabled(textRendererIndex, false);
                 }
                 return true;
@@ -322,27 +326,53 @@ public abstract class VideoPlayer extends BasePlayer
 
     protected abstract int getOverrideResolutionIndex(final List<VideoStream> sortedVideos, final String playbackQuality);
 
-    @Override
-    public void sync(@NonNull final PlayQueueItem item, @Nullable final StreamInfo info) {
-        super.sync(item, info);
+    protected void onMetadataChanged(@NonNull final PlayQueueItem item,
+                                     @Nullable final StreamInfo info,
+                                     final int newPlayQueueIndex,
+                                     final boolean hasPlayQueueItemChanged) {
         qualityTextView.setVisibility(View.GONE);
         playbackSpeedTextView.setVisibility(View.GONE);
 
-        if (info != null && info.video_streams.size() + info.video_only_streams.size() > 0) {
-            final List<VideoStream> videos = ListHelper.getSortedStreamVideosList(context,
-                    info.video_streams, info.video_only_streams, false);
-            availableStreams = new ArrayList<>(videos);
-            if (playbackQuality == null) {
-                selectedStreamIndex = getDefaultResolutionIndex(videos);
-            } else {
-                selectedStreamIndex = getOverrideResolutionIndex(videos, getPlaybackQuality());
-            }
+        playbackEndTime.setVisibility(View.GONE);
+        playbackLiveSync.setVisibility(View.GONE);
 
-            buildQualityMenu();
-            qualityTextView.setVisibility(View.VISIBLE);
-            surfaceView.setVisibility(View.VISIBLE);
-        } else {
-            surfaceView.setVisibility(View.GONE);
+        final StreamType streamType = info == null ? StreamType.NONE : info.getStreamType();
+
+        switch (streamType) {
+            case AUDIO_STREAM:
+                surfaceView.setVisibility(View.GONE);
+                playbackEndTime.setVisibility(View.VISIBLE);
+                break;
+
+            case AUDIO_LIVE_STREAM:
+                surfaceView.setVisibility(View.GONE);
+                playbackLiveSync.setVisibility(View.VISIBLE);
+                break;
+
+            case LIVE_STREAM:
+                surfaceView.setVisibility(View.VISIBLE);
+                playbackLiveSync.setVisibility(View.VISIBLE);
+                break;
+
+            case VIDEO_STREAM:
+                if (info.getVideoStreams().size() + info.getVideoOnlyStreams().size() == 0) break;
+
+                final List<VideoStream> videos = ListHelper.getSortedStreamVideosList(context,
+                        info.getVideoStreams(), info.getVideoOnlyStreams(), false);
+                availableStreams = new ArrayList<>(videos);
+                if (playbackQuality == null) {
+                    selectedStreamIndex = getDefaultResolutionIndex(videos);
+                } else {
+                    selectedStreamIndex = getOverrideResolutionIndex(videos, getPlaybackQuality());
+                }
+
+                buildQualityMenu();
+                qualityTextView.setVisibility(View.VISIBLE);
+
+                surfaceView.setVisibility(View.VISIBLE);
+            default:
+                playbackEndTime.setVisibility(View.VISIBLE);
+                break;
         }
 
         buildPlaybackSpeedMenu();
@@ -352,11 +382,14 @@ public abstract class VideoPlayer extends BasePlayer
     @Override
     @Nullable
     public MediaSource sourceOf(final PlayQueueItem item, final StreamInfo info) {
+        final MediaSource liveSource = super.sourceOf(item, info);
+        if (liveSource != null) return liveSource;
+
         List<MediaSource> mediaSources = new ArrayList<>();
 
         // Create video stream source
         final List<VideoStream> videos = ListHelper.getSortedStreamVideosList(context,
-                info.video_streams, info.video_only_streams, false);
+                info.getVideoStreams(), info.getVideoOnlyStreams(), false);
         final int index;
         if (videos.isEmpty()) {
             index = -1;
@@ -368,6 +401,7 @@ public abstract class VideoPlayer extends BasePlayer
         final VideoStream video = index >= 0 && index < videos.size() ? videos.get(index) : null;
         if (video != null) {
             final MediaSource streamSource = buildMediaSource(video.getUrl(),
+                    PlayerHelper.cacheKeyOf(info, video),
                     MediaFormat.getSuffixById(video.getFormatId()));
             mediaSources.add(streamSource);
         }
@@ -380,6 +414,7 @@ public abstract class VideoPlayer extends BasePlayer
         // Merge with audio stream in case if video does not contain audio
         if (audio != null && ((video != null && video.isVideoOnly) || video == null)) {
             final MediaSource audioSource = buildMediaSource(audio.getUrl(),
+                    PlayerHelper.cacheKeyOf(info, audio),
                     MediaFormat.getSuffixById(audio.getFormatId()));
             mediaSources.add(audioSource);
         }
@@ -391,12 +426,12 @@ public abstract class VideoPlayer extends BasePlayer
         // Create subtitle sources
         for (final Subtitles subtitle : info.getSubtitles()) {
             final String mimeType = PlayerHelper.mimeTypesOf(subtitle.getFileType());
-            if (mimeType == null || context == null) continue;
+            if (mimeType == null) continue;
 
             final Format textFormat = Format.createTextSampleFormat(null, mimeType,
                     SELECTION_FLAG_AUTOSELECT, PlayerHelper.captionLanguageOf(context, subtitle));
-            final MediaSource textSource = new SingleSampleMediaSource(
-                    Uri.parse(subtitle.getURL()), cacheDataSourceFactory, textFormat, TIME_UNSET);
+            final MediaSource textSource = dataSource.getSampleMediaSourceFactory()
+                    .createMediaSource(Uri.parse(subtitle.getURL()), textFormat, TIME_UNSET);
             mediaSources.add(textSource);
         }
 
@@ -417,7 +452,7 @@ public abstract class VideoPlayer extends BasePlayer
         super.onBlocked();
 
         controlsVisibilityHandler.removeCallbacksAndMessages(null);
-        animateView(controlsRoot, false, 300);
+        animateView(controlsRoot, false, DEFAULT_CONTROLS_DURATION);
 
         playbackSeekBar.setEnabled(false);
         // Bug on lower api, disabling and enabling the seekBar resets the thumb color -.-, so sets the color again
@@ -442,7 +477,7 @@ public abstract class VideoPlayer extends BasePlayer
             playbackSeekBar.getThumb().setColorFilter(Color.RED, PorterDuff.Mode.SRC_IN);
 
         loadingPanel.setVisibility(View.GONE);
-        showControlsThenHide();
+
         animateView(currentDisplaySeek, AnimationUtils.Type.SCALE_AND_ALPHA, false, 200);
         animateView(endScreen, false, 0);
     }
@@ -489,6 +524,12 @@ public abstract class VideoPlayer extends BasePlayer
         onTextTrackUpdate();
     }
 
+    @Override
+    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
+        super.onPlaybackParametersChanged(playbackParameters);
+        playbackSpeedTextView.setText(formatSpeed(playbackParameters.speed));
+    }
+
     @Override
     public void onVideoSizeChanged(int width, int height, int unappliedRotationDegrees, float pixelWidthHeightRatio) {
         if (DEBUG) {
@@ -529,26 +570,15 @@ public abstract class VideoPlayer extends BasePlayer
         }
 
         // Normalize mismatching language strings
-        final String preferredLanguage = trackSelector.getParameters().preferredTextLanguage;
-        // Because ExoPlayer normalizes the preferred language string but not the text track
-        // language strings, some preferred language string will have the language name in lowercase
-        String formattedPreferredLanguage = null;
-        if (preferredLanguage != null) {
-            for (final String language : availableLanguages) {
-                if (language.compareToIgnoreCase(preferredLanguage) == 0) {
-                    formattedPreferredLanguage = language;
-                    break;
-                }
-            }
-        }
+        final String preferredLanguage = trackSelector.getPreferredTextLanguage();
 
         // Build UI
         buildCaptionMenu(availableLanguages);
-        if (trackSelector.getRendererDisabled(textRenderer) || formattedPreferredLanguage == null ||
-                !availableLanguages.contains(formattedPreferredLanguage)) {
+        if (trackSelector.getRendererDisabled(textRenderer) || preferredLanguage == null ||
+                !availableLanguages.contains(preferredLanguage)) {
             captionTextView.setText(R.string.caption_none);
         } else {
-            captionTextView.setText(formattedPreferredLanguage);
+            captionTextView.setText(preferredLanguage);
         }
         captionTextView.setVisibility(availableLanguages.isEmpty() ? View.GONE : View.VISIBLE);
     }
@@ -576,7 +606,7 @@ public abstract class VideoPlayer extends BasePlayer
 
     @Override
     public void onUpdateProgress(int currentProgress, int duration, int bufferPercent) {
-        if (!isPrepared) return;
+        if (!isPrepared()) return;
 
         if (duration != playbackSeekBar.getMax()) {
             playbackEndTime.setText(getTimeString(duration));
@@ -592,17 +622,16 @@ public abstract class VideoPlayer extends BasePlayer
         if (DEBUG && bufferPercent % 20 == 0) { //Limit log
             Log.d(TAG, "updateProgress() called with: isVisible = " + isControlsVisible() + ", currentProgress = [" + currentProgress + "], duration = [" + duration + "], bufferPercent = [" + bufferPercent + "]");
         }
+        playbackLiveSync.setClickable(!isLiveEdge());
     }
 
     @Override
-    public void onThumbnailReceived(Bitmap thumbnail) {
-        super.onThumbnailReceived(thumbnail);
-        if (thumbnail != null) endScreen.setImageBitmap(thumbnail);
+    public void onLoadingComplete(String imageUri, View view, Bitmap loadedImage) {
+        super.onLoadingComplete(imageUri, view, loadedImage);
+        if (loadedImage != null) endScreen.setImageBitmap(loadedImage);
     }
 
     protected void onFullScreenButtonClicked() {
-        if (!isPlayerReady()) return;
-
         changeState(STATE_BLOCKED);
     }
 
@@ -633,6 +662,8 @@ public abstract class VideoPlayer extends BasePlayer
             onResizeClicked();
         } else if (v.getId() == captionTextView.getId()) {
             onCaptionClicked();
+        } else if (v.getId() == playbackLiveSync.getId()) {
+            seekToDefault();
         }
     }
 
@@ -683,7 +714,7 @@ public abstract class VideoPlayer extends BasePlayer
         if (DEBUG) Log.d(TAG, "onQualitySelectorClicked() called");
         qualityPopupMenu.show();
         isSomePopupMenuVisible = true;
-        showControls(300);
+        showControls(DEFAULT_CONTROLS_DURATION);
 
         final VideoStream videoStream = getSelectedVideoStream();
         if (videoStream != null) {
@@ -695,22 +726,22 @@ public abstract class VideoPlayer extends BasePlayer
         wasPlaying = simpleExoPlayer.getPlayWhenReady();
     }
 
-    private void onPlaybackSpeedClicked() {
+    public void onPlaybackSpeedClicked() {
         if (DEBUG) Log.d(TAG, "onPlaybackSpeedClicked() called");
         playbackSpeedPopupMenu.show();
         isSomePopupMenuVisible = true;
-        showControls(300);
+        showControls(DEFAULT_CONTROLS_DURATION);
     }
 
     private void onCaptionClicked() {
         if (DEBUG) Log.d(TAG, "onCaptionClicked() called");
         captionPopupMenu.show();
         isSomePopupMenuVisible = true;
-        showControls(300);
+        showControls(DEFAULT_CONTROLS_DURATION);
     }
 
     private void onResizeClicked() {
-        if (getAspectRatioFrameLayout() != null && context != null) {
+        if (getAspectRatioFrameLayout() != null) {
             final int currentResizeMode = getAspectRatioFrameLayout().getResizeMode();
             final int newResizeMode = nextResizeMode(currentResizeMode);
             getAspectRatioFrameLayout().setResizeMode(newResizeMode);
@@ -739,14 +770,15 @@ public abstract class VideoPlayer extends BasePlayer
         if (isPlaying()) simpleExoPlayer.setPlayWhenReady(false);
 
         showControls(0);
-        animateView(currentDisplaySeek, AnimationUtils.Type.SCALE_AND_ALPHA, true, 300);
+        animateView(currentDisplaySeek, AnimationUtils.Type.SCALE_AND_ALPHA, true,
+                DEFAULT_CONTROLS_DURATION);
     }
 
     @Override
     public void onStopTrackingTouch(SeekBar seekBar) {
         if (DEBUG) Log.d(TAG, "onStopTrackingTouch() called with: seekBar = [" + seekBar + "]");
 
-        simpleExoPlayer.seekTo(seekBar.getProgress());
+        seekTo(seekBar.getProgress());
         if (wasPlaying || simpleExoPlayer.getDuration() == seekBar.getProgress()) simpleExoPlayer.setPlayWhenReady(true);
 
         playbackCurrentTime.setText(getTimeString(seekBar.getProgress()));
@@ -795,7 +827,7 @@ public abstract class VideoPlayer extends BasePlayer
                         PropertyValuesHolder.ofFloat(View.ALPHA, 1f, 0f),
                         PropertyValuesHolder.ofFloat(View.SCALE_X, 1.4f, 1f),
                         PropertyValuesHolder.ofFloat(View.SCALE_Y, 1.4f, 1f)
-                ).setDuration(300);
+                ).setDuration(DEFAULT_CONTROLS_DURATION);
                 controlViewAnimator.addListener(new AnimatorListenerAdapter() {
                     @Override
                     public void onAnimationEnd(Animator animation) {
@@ -837,12 +869,8 @@ public abstract class VideoPlayer extends BasePlayer
 
     public void showControlsThenHide() {
         if (DEBUG) Log.d(TAG, "showControlsThenHide() called");
-        animateView(controlsRoot, true, 300, 0, new Runnable() {
-            @Override
-            public void run() {
-                hideControls(300, DEFAULT_CONTROLS_HIDE_TIME);
-            }
-        });
+        animateView(controlsRoot, true, DEFAULT_CONTROLS_DURATION, 0,
+                () -> hideControls(DEFAULT_CONTROLS_DURATION, DEFAULT_CONTROLS_HIDE_TIME));
     }
 
     public void showControls(long duration) {
@@ -854,12 +882,8 @@ public abstract class VideoPlayer extends BasePlayer
     public void hideControls(final long duration, long delay) {
         if (DEBUG) Log.d(TAG, "hideControls() called with: delay = [" + delay + "]");
         controlsVisibilityHandler.removeCallbacksAndMessages(null);
-        controlsVisibilityHandler.postDelayed(new Runnable() {
-            @Override
-            public void run() {
-                animateView(controlsRoot, false, duration);
-            }
-        }, delay);
+        controlsVisibilityHandler.postDelayed(
+                () -> animateView(controlsRoot, false, duration), delay);
     }
 
     /*//////////////////////////////////////////////////////////////////////////

app/src/main/java/org/schabi/newpipe/player/helper/AudioReactor.java

@@ -17,10 +17,14 @@ import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.audio.AudioRendererEventListener;
 import com.google.android.exoplayer2.decoder.DecoderCounters;
 
-public class AudioReactor implements AudioManager.OnAudioFocusChangeListener, AudioRendererEventListener {
+public class AudioReactor implements AudioManager.OnAudioFocusChangeListener,
+        AudioRendererEventListener {
 
     private static final String TAG = "AudioFocusReactor";
 
+    private static final boolean SHOULD_BUILD_FOCUS_REQUEST =
+            Build.VERSION.SDK_INT >= Build.VERSION_CODES.O;
+
     private static final int DUCK_DURATION = 1500;
     private static final float DUCK_AUDIO_TO = .2f;
 
@@ -33,13 +37,14 @@ public class AudioReactor implements AudioManager.OnAudioFocusChangeListener, Au
 
     private final AudioFocusRequest request;
 
-    public AudioReactor(@NonNull final Context context, @NonNull final SimpleExoPlayer player) {
+    public AudioReactor(@NonNull final Context context,
+                        @NonNull final SimpleExoPlayer player) {
         this.player = player;
         this.context = context;
         this.audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
-        player.setAudioDebugListener(this);
+        player.addAudioDebugListener(this);
 
-        if (shouldBuildFocusRequest()) {
+        if (SHOULD_BUILD_FOCUS_REQUEST) {
             request = new AudioFocusRequest.Builder(FOCUS_GAIN_TYPE)
                     .setAcceptsDelayedFocusGain(true)
                     .setWillPauseWhenDucked(true)
@@ -50,12 +55,17 @@ public class AudioReactor implements AudioManager.OnAudioFocusChangeListener, Au
         }
     }
 
+    public void dispose() {
+        abandonAudioFocus();
+        player.removeAudioDebugListener(this);
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
     // Audio Manager
     //////////////////////////////////////////////////////////////////////////*/
 
     public void requestAudioFocus() {
-        if (shouldBuildFocusRequest()) {
+        if (SHOULD_BUILD_FOCUS_REQUEST) {
             audioManager.requestAudioFocus(request);
         } else {
             audioManager.requestAudioFocus(this, STREAM_TYPE, FOCUS_GAIN_TYPE);
@@ -63,7 +73,7 @@ public class AudioReactor implements AudioManager.OnAudioFocusChangeListener, Au
     }
 
     public void abandonAudioFocus() {
-        if (shouldBuildFocusRequest()) {
+        if (SHOULD_BUILD_FOCUS_REQUEST) {
             audioManager.abandonAudioFocusRequest(request);
         } else {
             audioManager.abandonAudioFocus(this);
@@ -82,10 +92,6 @@ public class AudioReactor implements AudioManager.OnAudioFocusChangeListener, Au
         audioManager.setStreamVolume(STREAM_TYPE, volume, 0);
     }
 
-    private boolean shouldBuildFocusRequest() {
-        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.O;
-    }
-
     /*//////////////////////////////////////////////////////////////////////////
     // AudioFocus
     //////////////////////////////////////////////////////////////////////////*/
@@ -148,12 +154,8 @@ public class AudioReactor implements AudioManager.OnAudioFocusChangeListener, Au
                 player.setVolume(to);
             }
         });
-        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
-            @Override
-            public void onAnimationUpdate(ValueAnimator animation) {
-                player.setVolume(((float) animation.getAnimatedValue()));
-            }
-        });
+        valueAnimator.addUpdateListener(animation ->
+                player.setVolume(((float) animation.getAnimatedValue())));
         valueAnimator.start();
     }
 

app/src/main/java/org/schabi/newpipe/player/helper/CacheFactory.java

@@ -4,11 +4,14 @@ import android.content.Context;
 import android.support.annotation.NonNull;
 import android.util.Log;
 
+import com.google.android.exoplayer2.upstream.BandwidthMeter;
 import com.google.android.exoplayer2.upstream.DataSource;
 import com.google.android.exoplayer2.upstream.DefaultBandwidthMeter;
 import com.google.android.exoplayer2.upstream.DefaultDataSource;
 import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
+import com.google.android.exoplayer2.upstream.DefaultHttpDataSource;
 import com.google.android.exoplayer2.upstream.FileDataSource;
+import com.google.android.exoplayer2.upstream.TransferListener;
 import com.google.android.exoplayer2.upstream.cache.CacheDataSink;
 import com.google.android.exoplayer2.upstream.cache.CacheDataSource;
 import com.google.android.exoplayer2.upstream.cache.LeastRecentlyUsedCacheEvictor;
@@ -18,7 +21,7 @@ import org.schabi.newpipe.Downloader;
 
 import java.io.File;
 
-public class CacheFactory implements DataSource.Factory {
+/* package-private */ class CacheFactory implements DataSource.Factory {
     private static final String TAG = "CacheFactory";
     private static final String CACHE_FOLDER_NAME = "exoplayer";
     private static final int CACHE_FLAGS = CacheDataSource.FLAG_BLOCK_ON_CACHE | CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR;
@@ -33,18 +36,21 @@ public class CacheFactory implements DataSource.Factory {
     // todo: make this a singleton?
     private static SimpleCache cache;
 
-    public CacheFactory(@NonNull final Context context) {
-        this(context, PlayerHelper.getPreferredCacheSize(context), PlayerHelper.getPreferredFileSize(context));
+    public CacheFactory(@NonNull final Context context,
+                        @NonNull final String userAgent,
+                        @NonNull final TransferListener<? super DataSource> transferListener) {
+        this(context, userAgent, transferListener, PlayerHelper.getPreferredCacheSize(context),
+                PlayerHelper.getPreferredFileSize(context));
     }
 
-    CacheFactory(@NonNull final Context context, final long maxCacheSize, final long maxFileSize) {
-        super();
+    private CacheFactory(@NonNull final Context context,
+                         @NonNull final String userAgent,
+                         @NonNull final TransferListener<? super DataSource> transferListener,
+                         final long maxCacheSize,
+                         final long maxFileSize) {
         this.maxFileSize = maxFileSize;
 
-        final String userAgent = Downloader.USER_AGENT;
-        final DefaultBandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
-        dataSourceFactory = new DefaultDataSourceFactory(context, userAgent, bandwidthMeter);
-
+        dataSourceFactory = new DefaultDataSourceFactory(context, userAgent, transferListener);
         cacheDir = new File(context.getExternalCacheDir(), CACHE_FOLDER_NAME);
         if (!cacheDir.exists()) {
             //noinspection ResultOfMethodCallIgnored

app/src/main/java/org/schabi/newpipe/player/helper/LoadController.java

@@ -11,12 +11,14 @@ import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.upstream.Allocator;
 import com.google.android.exoplayer2.upstream.DefaultAllocator;
 
-import static com.google.android.exoplayer2.DefaultLoadControl.DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS;
+import static com.google.android.exoplayer2.DefaultLoadControl.DEFAULT_PRIORITIZE_TIME_OVER_SIZE_THRESHOLDS;
+import static com.google.android.exoplayer2.DefaultLoadControl.DEFAULT_TARGET_BUFFER_BYTES;
 
 public class LoadController implements LoadControl {
 
     public static final String TAG = "LoadController";
 
+    private final long initialPlaybackBufferUs;
     private final LoadControl internalLoadControl;
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -24,19 +26,25 @@ public class LoadController implements LoadControl {
     //////////////////////////////////////////////////////////////////////////*/
 
     public LoadController(final Context context) {
-        this(PlayerHelper.getMinBufferMs(context),
-                PlayerHelper.getMaxBufferMs(context),
-                PlayerHelper.getBufferForPlaybackMs(context));
+        this(PlayerHelper.getPlaybackStartBufferMs(context),
+                PlayerHelper.getPlaybackMinimumBufferMs(context),
+                PlayerHelper.getPlaybackOptimalBufferMs(context));
     }
 
-    public LoadController(final int minBufferMs,
-                          final int maxBufferMs,
-                          final int bufferForPlaybackMs) {
+    private LoadController(final int initialPlaybackBufferMs,
+                           final int minimumPlaybackbufferMs,
+                           final int optimalPlaybackBufferMs) {
+        this.initialPlaybackBufferUs = initialPlaybackBufferMs * 1000;
+
         final DefaultAllocator allocator = new DefaultAllocator(true,
                 C.DEFAULT_BUFFER_SEGMENT_SIZE);
 
-        internalLoadControl = new DefaultLoadControl(allocator, minBufferMs, maxBufferMs,
-                bufferForPlaybackMs, DEFAULT_BUFFER_FOR_PLAYBACK_AFTER_REBUFFER_MS);
+        internalLoadControl = new DefaultLoadControl(allocator,
+                /*minBufferMs=*/minimumPlaybackbufferMs,
+                /*maxBufferMs=*/optimalPlaybackBufferMs,
+                /*bufferForPlaybackMs=*/initialPlaybackBufferMs,
+                /*bufferForPlaybackAfterRebufferMs=*/initialPlaybackBufferMs,
+                DEFAULT_TARGET_BUFFER_BYTES, DEFAULT_PRIORITIZE_TIME_OVER_SIZE_THRESHOLDS);
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -49,7 +57,8 @@ public class LoadController implements LoadControl {
     }
 
     @Override
-    public void onTracksSelected(Renderer[] renderers, TrackGroupArray trackGroupArray, TrackSelectionArray trackSelectionArray) {
+    public void onTracksSelected(Renderer[] renderers, TrackGroupArray trackGroupArray,
+                                 TrackSelectionArray trackSelectionArray) {
         internalLoadControl.onTracksSelected(renderers, trackGroupArray, trackSelectionArray);
     }
 
@@ -69,12 +78,27 @@ public class LoadController implements LoadControl {
     }
 
     @Override
-    public boolean shouldStartPlayback(long l, boolean b) {
-        return internalLoadControl.shouldStartPlayback(l, b);
+    public long getBackBufferDurationUs() {
+        return internalLoadControl.getBackBufferDurationUs();
     }
 
     @Override
-    public boolean shouldContinueLoading(long l) {
-        return internalLoadControl.shouldContinueLoading(l);
+    public boolean retainBackBufferFromKeyframe() {
+        return internalLoadControl.retainBackBufferFromKeyframe();
+    }
+
+    @Override
+    public boolean shouldContinueLoading(long bufferedDurationUs, float playbackSpeed) {
+        return internalLoadControl.shouldContinueLoading(bufferedDurationUs, playbackSpeed);
+    }
+
+    @Override
+    public boolean shouldStartPlayback(long bufferedDurationUs, float playbackSpeed,
+                                       boolean rebuffering) {
+        final boolean isInitialPlaybackBufferFilled = bufferedDurationUs >=
+                this.initialPlaybackBufferUs * playbackSpeed;
+        final boolean isInternalStartingPlayback = internalLoadControl.shouldStartPlayback(
+                bufferedDurationUs, playbackSpeed, rebuffering);
+        return isInitialPlaybackBufferFilled || isInternalStartingPlayback;
     }
 }

app/src/main/java/org/schabi/newpipe/player/helper/MediaSessionManager.java

@@ -0,0 +1,38 @@
+package org.schabi.newpipe.player.helper;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+import android.support.v4.media.session.MediaSessionCompat;
+
+import com.google.android.exoplayer2.Player;
+import com.google.android.exoplayer2.ext.mediasession.MediaSessionConnector;
+
+import org.schabi.newpipe.player.mediasession.DummyPlaybackPreparer;
+import org.schabi.newpipe.player.mediasession.MediaSessionCallback;
+import org.schabi.newpipe.player.mediasession.PlayQueueNavigator;
+import org.schabi.newpipe.player.mediasession.PlayQueuePlaybackController;
+
+public class MediaSessionManager {
+    private static final String TAG = "MediaSessionManager";
+
+    private final MediaSessionCompat mediaSession;
+    private final MediaSessionConnector sessionConnector;
+
+    public MediaSessionManager(@NonNull final Context context,
+                               @NonNull final Player player,
+                               @NonNull final MediaSessionCallback callback) {
+        this.mediaSession = new MediaSessionCompat(context, TAG);
+        this.sessionConnector = new MediaSessionConnector(mediaSession,
+                new PlayQueuePlaybackController(callback));
+        this.sessionConnector.setQueueNavigator(new PlayQueueNavigator(mediaSession, callback));
+        this.sessionConnector.setPlayer(player, new DummyPlaybackPreparer());
+    }
+
+    public MediaSessionCompat getMediaSession() {
+        return mediaSession;
+    }
+
+    public MediaSessionConnector getSessionConnector() {
+        return sessionConnector;
+    }
+}

app/src/main/java/org/schabi/newpipe/player/helper/PlaybackParameterDialog.java

@@ -0,0 +1,379 @@
+package org.schabi.newpipe.player.helper;
+
+import android.app.Dialog;
+import android.content.Context;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.DialogFragment;
+import android.support.v7.app.AlertDialog;
+import android.util.Log;
+import android.view.View;
+import android.widget.CheckBox;
+import android.widget.SeekBar;
+import android.widget.TextView;
+
+import org.schabi.newpipe.R;
+import org.schabi.newpipe.util.SliderStrategy;
+
+import static org.schabi.newpipe.player.BasePlayer.DEBUG;
+
+public class PlaybackParameterDialog extends DialogFragment {
+    @NonNull private static final String TAG = "PlaybackParameterDialog";
+
+    public static final double MINIMUM_PLAYBACK_VALUE = 0.25f;
+    public static final double MAXIMUM_PLAYBACK_VALUE = 3.00f;
+
+    public static final char STEP_UP_SIGN = '+';
+    public static final char STEP_DOWN_SIGN = '-';
+    public static final double PLAYBACK_STEP_VALUE = 0.05f;
+
+    public static final double NIGHTCORE_TEMPO = 1.20f;
+    public static final double NIGHTCORE_PITCH_LOWER = 1.15f;
+    public static final double NIGHTCORE_PITCH_UPPER = 1.25f;
+
+    public static final double DEFAULT_TEMPO = 1.00f;
+    public static final double DEFAULT_PITCH = 1.00f;
+
+    @NonNull private static final String INITIAL_TEMPO_KEY = "initial_tempo_key";
+    @NonNull private static final String INITIAL_PITCH_KEY = "initial_pitch_key";
+
+    public interface Callback {
+        void onPlaybackParameterChanged(final float playbackTempo, final float playbackPitch);
+    }
+
+    @Nullable private Callback callback;
+
+    @NonNull private final SliderStrategy strategy = new SliderStrategy.Quadratic(
+            MINIMUM_PLAYBACK_VALUE, MAXIMUM_PLAYBACK_VALUE,
+            /*centerAt=*/1.00f, /*sliderGranularity=*/10000);
+
+    private double initialTempo = DEFAULT_TEMPO;
+    private double initialPitch = DEFAULT_PITCH;
+
+    @Nullable private SeekBar tempoSlider;
+    @Nullable private TextView tempoMinimumText;
+    @Nullable private TextView tempoMaximumText;
+    @Nullable private TextView tempoCurrentText;
+    @Nullable private TextView tempoStepDownText;
+    @Nullable private TextView tempoStepUpText;
+
+    @Nullable private SeekBar pitchSlider;
+    @Nullable private TextView pitchMinimumText;
+    @Nullable private TextView pitchMaximumText;
+    @Nullable private TextView pitchCurrentText;
+    @Nullable private TextView pitchStepDownText;
+    @Nullable private TextView pitchStepUpText;
+
+    @Nullable private CheckBox unhookingCheckbox;
+
+    @Nullable private TextView nightCorePresetText;
+    @Nullable private TextView resetPresetText;
+
+    public static PlaybackParameterDialog newInstance(final double playbackTempo,
+                                                      final double playbackPitch) {
+        PlaybackParameterDialog dialog = new PlaybackParameterDialog();
+        dialog.initialTempo = playbackTempo;
+        dialog.initialPitch = playbackPitch;
+        return dialog;
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Lifecycle
+    //////////////////////////////////////////////////////////////////////////*/
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        if (context != null && context instanceof Callback) {
+            callback = (Callback) context;
+        } else {
+            dismiss();
+        }
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        if (savedInstanceState != null) {
+            initialTempo = savedInstanceState.getDouble(INITIAL_TEMPO_KEY, DEFAULT_TEMPO);
+            initialPitch = savedInstanceState.getDouble(INITIAL_PITCH_KEY, DEFAULT_PITCH);
+        }
+    }
+
+    @Override
+    public void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putDouble(INITIAL_TEMPO_KEY, initialTempo);
+        outState.putDouble(INITIAL_PITCH_KEY, initialPitch);
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Dialog
+    //////////////////////////////////////////////////////////////////////////*/
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
+        final View view = View.inflate(getContext(), R.layout.dialog_playback_parameter, null);
+        setupControlViews(view);
+
+        final AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(requireActivity())
+                .setTitle(R.string.playback_speed_control)
+                .setView(view)
+                .setCancelable(true)
+                .setNegativeButton(R.string.cancel, (dialogInterface, i) ->
+                        setPlaybackParameters(initialTempo, initialPitch))
+                .setPositiveButton(R.string.finish, (dialogInterface, i) ->
+                        setCurrentPlaybackParameters());
+
+        return dialogBuilder.create();
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Control Views
+    //////////////////////////////////////////////////////////////////////////*/
+
+    private void setupControlViews(@NonNull View rootView) {
+        setupHookingControl(rootView);
+        setupTempoControl(rootView);
+        setupPitchControl(rootView);
+        setupPresetControl(rootView);
+    }
+
+    private void setupTempoControl(@NonNull View rootView) {
+        tempoSlider = rootView.findViewById(R.id.tempoSeekbar);
+        tempoMinimumText = rootView.findViewById(R.id.tempoMinimumText);
+        tempoMaximumText = rootView.findViewById(R.id.tempoMaximumText);
+        tempoCurrentText = rootView.findViewById(R.id.tempoCurrentText);
+        tempoStepUpText = rootView.findViewById(R.id.tempoStepUp);
+        tempoStepDownText = rootView.findViewById(R.id.tempoStepDown);
+
+        if (tempoCurrentText != null)
+            tempoCurrentText.setText(PlayerHelper.formatSpeed(initialTempo));
+        if (tempoMaximumText != null)
+            tempoMaximumText.setText(PlayerHelper.formatSpeed(MAXIMUM_PLAYBACK_VALUE));
+        if (tempoMinimumText != null)
+            tempoMinimumText.setText(PlayerHelper.formatSpeed(MINIMUM_PLAYBACK_VALUE));
+
+        if (tempoStepUpText != null) {
+            tempoStepUpText.setText(getStepUpPercentString(PLAYBACK_STEP_VALUE));
+            tempoStepUpText.setOnClickListener(view -> {
+                onTempoSliderUpdated(getCurrentTempo() + PLAYBACK_STEP_VALUE);
+                setCurrentPlaybackParameters();
+            });
+        }
+
+        if (tempoStepDownText != null) {
+            tempoStepDownText.setText(getStepDownPercentString(PLAYBACK_STEP_VALUE));
+            tempoStepDownText.setOnClickListener(view -> {
+                onTempoSliderUpdated(getCurrentTempo() - PLAYBACK_STEP_VALUE);
+                setCurrentPlaybackParameters();
+            });
+        }
+
+        if (tempoSlider != null) {
+            tempoSlider.setMax(strategy.progressOf(MAXIMUM_PLAYBACK_VALUE));
+            tempoSlider.setProgress(strategy.progressOf(initialTempo));
+            tempoSlider.setOnSeekBarChangeListener(getOnTempoChangedListener());
+        }
+    }
+
+    private void setupPitchControl(@NonNull View rootView) {
+        pitchSlider = rootView.findViewById(R.id.pitchSeekbar);
+        pitchMinimumText = rootView.findViewById(R.id.pitchMinimumText);
+        pitchMaximumText = rootView.findViewById(R.id.pitchMaximumText);
+        pitchCurrentText = rootView.findViewById(R.id.pitchCurrentText);
+        pitchStepDownText = rootView.findViewById(R.id.pitchStepDown);
+        pitchStepUpText = rootView.findViewById(R.id.pitchStepUp);
+
+        if (pitchCurrentText != null)
+            pitchCurrentText.setText(PlayerHelper.formatPitch(initialPitch));
+        if (pitchMaximumText != null)
+            pitchMaximumText.setText(PlayerHelper.formatPitch(MAXIMUM_PLAYBACK_VALUE));
+        if (pitchMinimumText != null)
+            pitchMinimumText.setText(PlayerHelper.formatPitch(MINIMUM_PLAYBACK_VALUE));
+
+        if (pitchStepUpText != null) {
+            pitchStepUpText.setText(getStepUpPercentString(PLAYBACK_STEP_VALUE));
+            pitchStepUpText.setOnClickListener(view -> {
+                onPitchSliderUpdated(getCurrentPitch() + PLAYBACK_STEP_VALUE);
+                setCurrentPlaybackParameters();
+            });
+        }
+
+        if (pitchStepDownText != null) {
+            pitchStepDownText.setText(getStepDownPercentString(PLAYBACK_STEP_VALUE));
+            pitchStepDownText.setOnClickListener(view -> {
+                onPitchSliderUpdated(getCurrentPitch() - PLAYBACK_STEP_VALUE);
+                setCurrentPlaybackParameters();
+            });
+        }
+
+        if (pitchSlider != null) {
+            pitchSlider.setMax(strategy.progressOf(MAXIMUM_PLAYBACK_VALUE));
+            pitchSlider.setProgress(strategy.progressOf(initialPitch));
+            pitchSlider.setOnSeekBarChangeListener(getOnPitchChangedListener());
+        }
+    }
+
+    private void setupHookingControl(@NonNull View rootView) {
+        unhookingCheckbox = rootView.findViewById(R.id.unhookCheckbox);
+        if (unhookingCheckbox != null) {
+            unhookingCheckbox.setChecked(initialPitch != initialTempo);
+            unhookingCheckbox.setOnCheckedChangeListener((compoundButton, isChecked) -> {
+                if (isChecked) return;
+                // When unchecked, slide back to the minimum of current tempo or pitch
+                final double minimum = Math.min(getCurrentPitch(), getCurrentTempo());
+                setSliders(minimum);
+                setCurrentPlaybackParameters();
+            });
+        }
+    }
+
+    private void setupPresetControl(@NonNull View rootView) {
+        nightCorePresetText = rootView.findViewById(R.id.presetNightcore);
+        if (nightCorePresetText != null) {
+            nightCorePresetText.setOnClickListener(view -> {
+                final double randomPitch = NIGHTCORE_PITCH_LOWER +
+                        Math.random() * (NIGHTCORE_PITCH_UPPER - NIGHTCORE_PITCH_LOWER);
+
+                setTempoSlider(NIGHTCORE_TEMPO);
+                setPitchSlider(randomPitch);
+                setCurrentPlaybackParameters();
+            });
+        }
+
+        resetPresetText = rootView.findViewById(R.id.presetReset);
+        if (resetPresetText != null) {
+            resetPresetText.setOnClickListener(view -> {
+                setTempoSlider(DEFAULT_TEMPO);
+                setPitchSlider(DEFAULT_PITCH);
+                setCurrentPlaybackParameters();
+            });
+        }
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Sliders
+    //////////////////////////////////////////////////////////////////////////*/
+
+    private SeekBar.OnSeekBarChangeListener getOnTempoChangedListener() {
+        return new SeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+                final double currentTempo = strategy.valueOf(progress);
+                if (fromUser) {
+                    onTempoSliderUpdated(currentTempo);
+                    setCurrentPlaybackParameters();
+                }
+            }
+
+            @Override
+            public void onStartTrackingTouch(SeekBar seekBar) {
+                // Do Nothing.
+            }
+
+            @Override
+            public void onStopTrackingTouch(SeekBar seekBar) {
+                // Do Nothing.
+            }
+        };
+    }
+
+    private SeekBar.OnSeekBarChangeListener getOnPitchChangedListener() {
+        return new SeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+                final double currentPitch = strategy.valueOf(progress);
+                if (fromUser) { // this change is first in chain
+                    onPitchSliderUpdated(currentPitch);
+                    setCurrentPlaybackParameters();
+                }
+            }
+
+            @Override
+            public void onStartTrackingTouch(SeekBar seekBar) {
+                // Do Nothing.
+            }
+
+            @Override
+            public void onStopTrackingTouch(SeekBar seekBar) {
+                // Do Nothing.
+            }
+        };
+    }
+
+    private void onTempoSliderUpdated(final double newTempo) {
+        if (unhookingCheckbox == null) return;
+        if (!unhookingCheckbox.isChecked()) {
+            setSliders(newTempo);
+        } else {
+            setTempoSlider(newTempo);
+        }
+    }
+
+    private void onPitchSliderUpdated(final double newPitch) {
+        if (unhookingCheckbox == null) return;
+        if (!unhookingCheckbox.isChecked()) {
+            setSliders(newPitch);
+        } else {
+            setPitchSlider(newPitch);
+        }
+    }
+
+    private void setSliders(final double newValue) {
+        setTempoSlider(newValue);
+        setPitchSlider(newValue);
+    }
+
+    private void setTempoSlider(final double newTempo) {
+        if (tempoSlider == null) return;
+        tempoSlider.setProgress(strategy.progressOf(newTempo));
+    }
+
+    private void setPitchSlider(final double newPitch) {
+        if (pitchSlider == null) return;
+        pitchSlider.setProgress(strategy.progressOf(newPitch));
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Helper
+    //////////////////////////////////////////////////////////////////////////*/
+
+    private void setCurrentPlaybackParameters() {
+        setPlaybackParameters(getCurrentTempo(), getCurrentPitch());
+    }
+
+    private void setPlaybackParameters(final double tempo, final double pitch) {
+        if (callback != null && tempoCurrentText != null && pitchCurrentText != null) {
+            if (DEBUG) Log.d(TAG, "Setting playback parameters to " +
+                    "tempo=[" + tempo + "], " +
+                    "pitch=[" + pitch + "]");
+
+            tempoCurrentText.setText(PlayerHelper.formatSpeed(tempo));
+            pitchCurrentText.setText(PlayerHelper.formatPitch(pitch));
+            callback.onPlaybackParameterChanged((float) tempo, (float) pitch);
+        }
+    }
+
+    private double getCurrentTempo() {
+        return tempoSlider == null ? initialTempo : strategy.valueOf(
+                tempoSlider.getProgress());
+    }
+
+    private double getCurrentPitch() {
+        return pitchSlider == null ? initialPitch : strategy.valueOf(
+                pitchSlider.getProgress());
+    }
+
+    @NonNull
+    private static String getStepUpPercentString(final double percent) {
+        return STEP_UP_SIGN + PlayerHelper.formatPitch(percent);
+    }
+
+    @NonNull
+    private static String getStepDownPercentString(final double percent) {
+        return STEP_DOWN_SIGN + PlayerHelper.formatPitch(percent);
+    }
+}

app/src/main/java/org/schabi/newpipe/player/helper/PlayerDataSource.java

@@ -0,0 +1,78 @@
+package org.schabi.newpipe.player.helper;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+
+import com.google.android.exoplayer2.source.ExtractorMediaSource;
+import com.google.android.exoplayer2.source.SingleSampleMediaSource;
+import com.google.android.exoplayer2.source.dash.DashMediaSource;
+import com.google.android.exoplayer2.source.dash.DefaultDashChunkSource;
+import com.google.android.exoplayer2.source.hls.HlsMediaSource;
+import com.google.android.exoplayer2.source.smoothstreaming.DefaultSsChunkSource;
+import com.google.android.exoplayer2.source.smoothstreaming.SsMediaSource;
+import com.google.android.exoplayer2.upstream.DataSource;
+import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
+import com.google.android.exoplayer2.upstream.TransferListener;
+
+public class PlayerDataSource {
+    private static final int MANIFEST_MINIMUM_RETRY = 5;
+    private static final int EXTRACTOR_MINIMUM_RETRY = Integer.MAX_VALUE;
+    private static final int LIVE_STREAM_EDGE_GAP_MILLIS = 10000;
+
+    private final DataSource.Factory cacheDataSourceFactory;
+    private final DataSource.Factory cachelessDataSourceFactory;
+
+    public PlayerDataSource(@NonNull final Context context,
+                            @NonNull final String userAgent,
+                            @NonNull final TransferListener<? super DataSource> transferListener) {
+        cacheDataSourceFactory = new CacheFactory(context, userAgent, transferListener);
+        cachelessDataSourceFactory = new DefaultDataSourceFactory(context, userAgent, transferListener);
+    }
+
+    public SsMediaSource.Factory getLiveSsMediaSourceFactory() {
+        return new SsMediaSource.Factory(new DefaultSsChunkSource.Factory(
+                cachelessDataSourceFactory), cachelessDataSourceFactory)
+                .setMinLoadableRetryCount(MANIFEST_MINIMUM_RETRY)
+                .setLivePresentationDelayMs(LIVE_STREAM_EDGE_GAP_MILLIS);
+    }
+
+    public HlsMediaSource.Factory getLiveHlsMediaSourceFactory() {
+        return new HlsMediaSource.Factory(cachelessDataSourceFactory)
+                .setAllowChunklessPreparation(true)
+                .setMinLoadableRetryCount(MANIFEST_MINIMUM_RETRY);
+    }
+
+    public DashMediaSource.Factory getLiveDashMediaSourceFactory() {
+        return new DashMediaSource.Factory(new DefaultDashChunkSource.Factory(
+                cachelessDataSourceFactory), cachelessDataSourceFactory)
+                .setMinLoadableRetryCount(MANIFEST_MINIMUM_RETRY)
+                .setLivePresentationDelayMs(LIVE_STREAM_EDGE_GAP_MILLIS);
+    }
+
+    public SsMediaSource.Factory getSsMediaSourceFactory() {
+        return new SsMediaSource.Factory(new DefaultSsChunkSource.Factory(
+                cacheDataSourceFactory), cacheDataSourceFactory);
+    }
+
+    public HlsMediaSource.Factory getHlsMediaSourceFactory() {
+        return new HlsMediaSource.Factory(cacheDataSourceFactory);
+    }
+
+    public DashMediaSource.Factory getDashMediaSourceFactory() {
+        return new DashMediaSource.Factory(new DefaultDashChunkSource.Factory(
+                cacheDataSourceFactory), cacheDataSourceFactory);
+    }
+
+    public ExtractorMediaSource.Factory getExtractorMediaSourceFactory() {
+        return new ExtractorMediaSource.Factory(cacheDataSourceFactory)
+                .setMinLoadableRetryCount(EXTRACTOR_MINIMUM_RETRY);
+    }
+
+    public ExtractorMediaSource.Factory getExtractorMediaSourceFactory(@NonNull final String key) {
+        return getExtractorMediaSourceFactory().setCustomCacheKey(key);
+    }
+
+    public SingleSampleMediaSource.Factory getSampleMediaSourceFactory() {
+        return new SingleSampleMediaSource.Factory(cacheDataSourceFactory);
+    }
+}

app/src/main/java/org/schabi/newpipe/player/helper/PlayerHelper.java

@@ -4,25 +4,36 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 
+import com.google.android.exoplayer2.SeekParameters;
 import com.google.android.exoplayer2.ui.AspectRatioFrameLayout;
 import com.google.android.exoplayer2.util.MimeTypes;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.Subtitles;
+import org.schabi.newpipe.extractor.stream.AudioStream;
+import org.schabi.newpipe.extractor.stream.StreamInfo;
+import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.SubtitlesFormat;
+import org.schabi.newpipe.extractor.stream.VideoStream;
+import org.schabi.newpipe.playlist.PlayQueue;
+import org.schabi.newpipe.playlist.PlayQueueItem;
+import org.schabi.newpipe.playlist.SinglePlayQueue;
 
 import java.text.DecimalFormat;
 import java.text.NumberFormat;
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Formatter;
+import java.util.HashSet;
+import java.util.List;
 import java.util.Locale;
-
-import javax.annotation.Nonnull;
+import java.util.Set;
 
 import static com.google.android.exoplayer2.ui.AspectRatioFrameLayout.RESIZE_MODE_FILL;
 import static com.google.android.exoplayer2.ui.AspectRatioFrameLayout.RESIZE_MODE_FIT;
-import static com.google.android.exoplayer2.ui.AspectRatioFrameLayout.RESIZE_MODE_FIXED_HEIGHT;
-import static com.google.android.exoplayer2.ui.AspectRatioFrameLayout.RESIZE_MODE_FIXED_WIDTH;
 import static com.google.android.exoplayer2.ui.AspectRatioFrameLayout.RESIZE_MODE_ZOOM;
 
 public class PlayerHelper {
@@ -49,11 +60,11 @@ public class PlayerHelper {
                 : stringFormatter.format("%02d:%02d", minutes, seconds).toString();
     }
 
-    public static String formatSpeed(float speed) {
+    public static String formatSpeed(double speed) {
         return speedFormatter.format(speed);
     }
 
-    public static String formatPitch(float pitch) {
+    public static String formatPitch(double pitch) {
         return pitchFormatter.format(pitch);
     }
 
@@ -69,10 +80,10 @@ public class PlayerHelper {
     public static String captionLanguageOf(@NonNull final Context context,
                                            @NonNull final Subtitles subtitles) {
         final String displayName = subtitles.getLocale().getDisplayName(subtitles.getLocale());
-        return displayName + (subtitles.isAutoGenerated() ?
-                " (" + context.getString(R.string.caption_auto_generated)+ ")" : "");
+        return displayName + (subtitles.isAutoGenerated() ? " (" + context.getString(R.string.caption_auto_generated)+ ")" : "");
     }
 
+    @NonNull
     public static String resizeTypeOf(@NonNull final Context context,
                                       @AspectRatioFrameLayout.ResizeMode final int resizeMode) {
         switch (resizeMode) {
@@ -83,6 +94,58 @@ public class PlayerHelper {
         }
     }
 
+    @NonNull
+    public static String cacheKeyOf(@NonNull final StreamInfo info, @NonNull VideoStream video) {
+        return info.getUrl() + video.getResolution() + video.getFormat().getName();
+    }
+
+    @NonNull
+    public static String cacheKeyOf(@NonNull final StreamInfo info, @NonNull AudioStream audio) {
+        return info.getUrl() + audio.getAverageBitrate() + audio.getFormat().getName();
+    }
+
+    /**
+     * Given a {@link StreamInfo} and the existing queue items, provide the
+     * {@link SinglePlayQueue} consisting of the next video for auto queuing.
+     * <br><br>
+     * This method detects and prevents cycle by naively checking if a
+     * candidate next video's url already exists in the existing items.
+     * <br><br>
+     * To select the next video, {@link StreamInfo#getNextVideo()} is first
+     * checked. If it is nonnull and is not part of the existing items, then
+     * it will be used as the next video. Otherwise, an random item with
+     * non-repeating url will be selected from the {@link StreamInfo#getRelatedStreams()}.
+     * */
+    @Nullable
+    public static PlayQueue autoQueueOf(@NonNull final StreamInfo info,
+                                        @NonNull final List<PlayQueueItem> existingItems) {
+        Set<String> urls = new HashSet<>(existingItems.size());
+        for (final PlayQueueItem item : existingItems) {
+            urls.add(item.getUrl());
+        }
+
+        final StreamInfoItem nextVideo = info.getNextVideo();
+        if (nextVideo != null && !urls.contains(nextVideo.getUrl())) {
+            return new SinglePlayQueue(nextVideo);
+        }
+
+        final List<InfoItem> relatedItems = info.getRelatedStreams();
+        if (relatedItems == null) return null;
+
+        List<StreamInfoItem> autoQueueItems = new ArrayList<>();
+        for (final InfoItem item : info.getRelatedStreams()) {
+            if (item instanceof StreamInfoItem && !urls.contains(item.getUrl())) {
+                autoQueueItems.add((StreamInfoItem) item);
+            }
+        }
+        Collections.shuffle(autoQueueItems);
+        return autoQueueItems.isEmpty() ? null : new SinglePlayQueue(autoQueueItems.get(0));
+    }
+
+    ////////////////////////////////////////////////////////////////////////////
+    // Settings Resolution
+    ////////////////////////////////////////////////////////////////////////////
+
     public static boolean isResumeAfterAudioFocusGain(@NonNull final Context context) {
         return isResumeAfterAudioFocusGain(context, false);
     }
@@ -95,10 +158,20 @@ public class PlayerHelper {
         return isUsingOldPlayer(context, false);
     }
 
-    public static boolean isRememberingPopupDimensions(@Nonnull final Context context) {
+    public static boolean isRememberingPopupDimensions(@NonNull final Context context) {
         return isRememberingPopupDimensions(context, true);
     }
 
+    public static boolean isAutoQueueEnabled(@NonNull final Context context) {
+        return isAutoQueueEnabled(context, false);
+    }
+
+    @NonNull
+    public static SeekParameters getSeekParameters(@NonNull final Context context) {
+        return isUsingInexactSeek(context, false) ?
+                SeekParameters.CLOSEST_SYNC : SeekParameters.EXACT;
+    }
+
     public static long getPreferredCacheSize(@NonNull final Context context) {
         return 64 * 1024 * 1024L;
     }
@@ -107,27 +180,38 @@ public class PlayerHelper {
         return 512 * 1024L;
     }
 
-    public static int getMinBufferMs(@NonNull final Context context) {
-        return 15000;
+    /**
+     * Returns the number of milliseconds the player buffers for before starting playback.
+     * */
+    public static int getPlaybackStartBufferMs(@NonNull final Context context) {
+        return 500;
     }
 
-    public static int getMaxBufferMs(@NonNull final Context context) {
-        return 30000;
+    /**
+     * Returns the minimum number of milliseconds the player always buffers to after starting
+     * playback.
+     * */
+    public static int getPlaybackMinimumBufferMs(@NonNull final Context context) {
+        return 25000;
     }
 
-    public static int getBufferForPlaybackMs(@NonNull final Context context) {
-        return 2500;
+    /**
+     * Returns the maximum/optimal number of milliseconds the player will buffer to once the buffer
+     * hits the point of {@link #getPlaybackMinimumBufferMs(Context)}.
+     * */
+    public static int getPlaybackOptimalBufferMs(@NonNull final Context context) {
+        return 60000;
     }
 
     public static boolean isUsingDSP(@NonNull final Context context) {
         return true;
     }
 
-    public static int getShutdownFlingVelocity(@Nonnull final Context context) {
+    public static int getShutdownFlingVelocity(@NonNull final Context context) {
         return 10000;
     }
 
-    public static int getTossFlingVelocity(@Nonnull final Context context) {
+    public static int getTossFlingVelocity(@NonNull final Context context) {
         return 2500;
     }
 
@@ -152,7 +236,15 @@ public class PlayerHelper {
         return getPreferences(context).getBoolean(context.getString(R.string.use_old_player_key), b);
     }
 
-    private static boolean isRememberingPopupDimensions(@Nonnull final Context context, final boolean b) {
+    private static boolean isRememberingPopupDimensions(@NonNull final Context context, final boolean b) {
         return getPreferences(context).getBoolean(context.getString(R.string.popup_remember_size_pos_key), b);
     }
+
+    private static boolean isUsingInexactSeek(@NonNull final Context context, final boolean b) {
+        return getPreferences(context).getBoolean(context.getString(R.string.use_inexact_seek_key), b);
+    }
+
+    private static boolean isAutoQueueEnabled(@NonNull final Context context, final boolean b) {
+        return getPreferences(context).getBoolean(context.getString(R.string.auto_queue_key), b);
+    }
 }

app/src/main/java/org/schabi/newpipe/player/mediasession/DummyPlaybackPreparer.java

@@ -0,0 +1,45 @@
+package org.schabi.newpipe.player.mediasession;
+
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.ResultReceiver;
+
+import com.google.android.exoplayer2.Player;
+import com.google.android.exoplayer2.ext.mediasession.MediaSessionConnector;
+
+public class DummyPlaybackPreparer implements MediaSessionConnector.PlaybackPreparer {
+    @Override
+    public long getSupportedPrepareActions() {
+        return 0;
+    }
+
+    @Override
+    public void onPrepare() {
+
+    }
+
+    @Override
+    public void onPrepareFromMediaId(String mediaId, Bundle extras) {
+
+    }
+
+    @Override
+    public void onPrepareFromSearch(String query, Bundle extras) {
+
+    }
+
+    @Override
+    public void onPrepareFromUri(Uri uri, Bundle extras) {
+
+    }
+
+    @Override
+    public String[] getCommands() {
+        return new String[0];
+    }
+
+    @Override
+    public void onCommand(Player player, String command, Bundle extras, ResultReceiver cb) {
+
+    }
+}

app/src/main/java/org/schabi/newpipe/player/mediasession/MediaSessionCallback.java

@@ -0,0 +1,17 @@
+package org.schabi.newpipe.player.mediasession;
+
+import android.support.v4.media.MediaDescriptionCompat;
+
+public interface MediaSessionCallback {
+    void onSkipToPrevious();
+    void onSkipToNext();
+    void onSkipToIndex(final int index);
+
+    int getCurrentPlayingIndex();
+    int getQueueSize();
+    MediaDescriptionCompat getQueueMetadata(final int index);
+
+    void onPlay();
+    void onPause();
+    void onSetShuffle(final boolean isShuffled);
+}

app/src/main/java/org/schabi/newpipe/player/mediasession/PlayQueueNavigator.java

@@ -0,0 +1,111 @@
+package org.schabi.newpipe.player.mediasession;
+
+import android.os.Bundle;
+import android.os.ResultReceiver;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.media.session.MediaSessionCompat;
+
+import com.google.android.exoplayer2.Player;
+import com.google.android.exoplayer2.ext.mediasession.MediaSessionConnector;
+import com.google.android.exoplayer2.util.Util;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import static android.support.v4.media.session.PlaybackStateCompat.ACTION_SKIP_TO_NEXT;
+import static android.support.v4.media.session.PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS;
+import static android.support.v4.media.session.PlaybackStateCompat.ACTION_SKIP_TO_QUEUE_ITEM;
+
+
+public class PlayQueueNavigator implements MediaSessionConnector.QueueNavigator {
+    public static final int DEFAULT_MAX_QUEUE_SIZE = 10;
+
+    private final MediaSessionCompat mediaSession;
+    private final MediaSessionCallback callback;
+    private final int maxQueueSize;
+
+    private long activeQueueItemId;
+
+    public PlayQueueNavigator(@NonNull final MediaSessionCompat mediaSession,
+                              @NonNull final MediaSessionCallback callback) {
+        this.mediaSession = mediaSession;
+        this.callback = callback;
+        this.maxQueueSize = DEFAULT_MAX_QUEUE_SIZE;
+
+        this.activeQueueItemId = MediaSessionCompat.QueueItem.UNKNOWN_ID;
+    }
+
+    @Override
+    public long getSupportedQueueNavigatorActions(@Nullable Player player) {
+        return ACTION_SKIP_TO_NEXT | ACTION_SKIP_TO_PREVIOUS | ACTION_SKIP_TO_QUEUE_ITEM;
+    }
+
+    @Override
+    public void onTimelineChanged(Player player) {
+        publishFloatingQueueWindow();
+    }
+
+    @Override
+    public void onCurrentWindowIndexChanged(Player player) {
+        if (activeQueueItemId == MediaSessionCompat.QueueItem.UNKNOWN_ID
+                || player.getCurrentTimeline().getWindowCount() > maxQueueSize) {
+            publishFloatingQueueWindow();
+        } else if (!player.getCurrentTimeline().isEmpty()) {
+            activeQueueItemId = player.getCurrentWindowIndex();
+        }
+    }
+
+    @Override
+    public long getActiveQueueItemId(@Nullable Player player) {
+        return callback.getCurrentPlayingIndex();
+    }
+
+    @Override
+    public void onSkipToPrevious(Player player) {
+        callback.onSkipToPrevious();
+    }
+
+    @Override
+    public void onSkipToQueueItem(Player player, long id) {
+        callback.onSkipToIndex((int) id);
+    }
+
+    @Override
+    public void onSkipToNext(Player player) {
+        callback.onSkipToNext();
+    }
+
+    private void publishFloatingQueueWindow() {
+        if (callback.getQueueSize() == 0) {
+            mediaSession.setQueue(Collections.<MediaSessionCompat.QueueItem>emptyList());
+            activeQueueItemId = MediaSessionCompat.QueueItem.UNKNOWN_ID;
+            return;
+        }
+
+        // Yes this is almost a copypasta, got a problem with that? =\
+        int windowCount = callback.getQueueSize();
+        int currentWindowIndex = callback.getCurrentPlayingIndex();
+        int queueSize = Math.min(maxQueueSize, windowCount);
+        int startIndex = Util.constrainValue(currentWindowIndex - ((queueSize - 1) / 2), 0,
+                windowCount - queueSize);
+
+        List<MediaSessionCompat.QueueItem> queue = new ArrayList<>();
+        for (int i = startIndex; i < startIndex + queueSize; i++) {
+            queue.add(new MediaSessionCompat.QueueItem(callback.getQueueMetadata(i), i));
+        }
+        mediaSession.setQueue(queue);
+        activeQueueItemId = currentWindowIndex;
+    }
+
+    @Override
+    public String[] getCommands() {
+        return new String[0];
+    }
+
+    @Override
+    public void onCommand(Player player, String command, Bundle extras, ResultReceiver cb) {
+
+    }
+}

app/src/main/java/org/schabi/newpipe/player/mediasession/PlayQueuePlaybackController.java

@@ -0,0 +1,31 @@
+package org.schabi.newpipe.player.mediasession;
+
+import android.support.v4.media.session.PlaybackStateCompat;
+
+import com.google.android.exoplayer2.Player;
+import com.google.android.exoplayer2.ext.mediasession.DefaultPlaybackController;
+
+public class PlayQueuePlaybackController extends DefaultPlaybackController {
+    private final MediaSessionCallback callback;
+
+    public PlayQueuePlaybackController(final MediaSessionCallback callback) {
+        super();
+        this.callback = callback;
+    }
+
+    @Override
+    public void onPlay(Player player) {
+        callback.onPlay();
+    }
+
+    @Override
+    public void onPause(Player player) {
+        callback.onPause();
+    }
+
+    @Override
+    public void onSetShuffleMode(Player player, int shuffleMode) {
+        callback.onSetShuffle(shuffleMode == PlaybackStateCompat.SHUFFLE_MODE_ALL
+                || shuffleMode == PlaybackStateCompat.SHUFFLE_MODE_GROUP);
+    }
+}

app/src/main/java/org/schabi/newpipe/player/mediasource/FailedMediaSource.java

@@ -0,0 +1,84 @@
+package org.schabi.newpipe.player.mediasource;
+
+import android.support.annotation.NonNull;
+import android.util.Log;
+
+import com.google.android.exoplayer2.ExoPlayer;
+import com.google.android.exoplayer2.source.MediaPeriod;
+import com.google.android.exoplayer2.upstream.Allocator;
+
+import org.schabi.newpipe.playlist.PlayQueueItem;
+
+import java.io.IOException;
+
+public class FailedMediaSource implements ManagedMediaSource {
+    private final String TAG = "FailedMediaSource@" + Integer.toHexString(hashCode());
+
+    private final PlayQueueItem playQueueItem;
+    private final Throwable error;
+
+    private final long retryTimestamp;
+
+    public FailedMediaSource(@NonNull final PlayQueueItem playQueueItem,
+                             @NonNull final Throwable error,
+                             final long retryTimestamp) {
+        this.playQueueItem = playQueueItem;
+        this.error = error;
+        this.retryTimestamp = retryTimestamp;
+    }
+
+    /**
+     * Permanently fail the play queue item associated with this source, with no hope of retrying.
+     * The error will always be propagated to ExoPlayer.
+     * */
+    public FailedMediaSource(@NonNull final PlayQueueItem playQueueItem,
+                             @NonNull final Throwable error) {
+        this.playQueueItem = playQueueItem;
+        this.error = error;
+        this.retryTimestamp = Long.MAX_VALUE;
+    }
+
+    public PlayQueueItem getStream() {
+        return playQueueItem;
+    }
+
+    public Throwable getError() {
+        return error;
+    }
+
+    private boolean canRetry() {
+        return System.currentTimeMillis() >= retryTimestamp;
+    }
+
+    @Override
+    public void prepareSource(ExoPlayer player, boolean isTopLevelSource, Listener listener) {
+        Log.e(TAG, "Loading failed source: ", error);
+    }
+
+    @Override
+    public void maybeThrowSourceInfoRefreshError() throws IOException {
+        throw new IOException(error);
+    }
+
+    @Override
+    public MediaPeriod createPeriod(MediaPeriodId id, Allocator allocator) {
+        return null;
+    }
+
+    @Override
+    public void releasePeriod(MediaPeriod mediaPeriod) {}
+
+    @Override
+    public void releaseSource() {}
+
+    @Override
+    public boolean shouldBeReplacedWith(@NonNull final PlayQueueItem newIdentity,
+                                        final boolean isInterruptable) {
+        return newIdentity != playQueueItem || canRetry();
+    }
+
+    @Override
+    public boolean isStreamEqual(@NonNull PlayQueueItem stream) {
+        return playQueueItem == stream;
+    }
+}

app/src/main/java/org/schabi/newpipe/player/mediasource/LoadedMediaSource.java

@@ -0,0 +1,71 @@
+package org.schabi.newpipe.player.mediasource;
+
+import android.support.annotation.NonNull;
+
+import com.google.android.exoplayer2.ExoPlayer;
+import com.google.android.exoplayer2.source.MediaPeriod;
+import com.google.android.exoplayer2.source.MediaSource;
+import com.google.android.exoplayer2.upstream.Allocator;
+
+import org.schabi.newpipe.playlist.PlayQueueItem;
+
+import java.io.IOException;
+
+public class LoadedMediaSource implements ManagedMediaSource {
+
+    private final MediaSource source;
+    private final PlayQueueItem stream;
+    private final long expireTimestamp;
+
+    public LoadedMediaSource(@NonNull final MediaSource source,
+                             @NonNull final PlayQueueItem stream,
+                             final long expireTimestamp) {
+        this.source = source;
+        this.stream = stream;
+        this.expireTimestamp = expireTimestamp;
+    }
+
+    public PlayQueueItem getStream() {
+        return stream;
+    }
+
+    private boolean isExpired() {
+        return System.currentTimeMillis() >= expireTimestamp;
+    }
+
+    @Override
+    public void prepareSource(ExoPlayer player, boolean isTopLevelSource, Listener listener) {
+        source.prepareSource(player, isTopLevelSource, listener);
+    }
+
+    @Override
+    public void maybeThrowSourceInfoRefreshError() throws IOException {
+        source.maybeThrowSourceInfoRefreshError();
+    }
+
+    @Override
+    public MediaPeriod createPeriod(MediaPeriodId id, Allocator allocator) {
+        return source.createPeriod(id, allocator);
+    }
+
+    @Override
+    public void releasePeriod(MediaPeriod mediaPeriod) {
+        source.releasePeriod(mediaPeriod);
+    }
+
+    @Override
+    public void releaseSource() {
+        source.releaseSource();
+    }
+
+    @Override
+    public boolean shouldBeReplacedWith(@NonNull PlayQueueItem newIdentity,
+                                        final boolean isInterruptable) {
+        return newIdentity != stream || (isInterruptable && isExpired());
+    }
+
+    @Override
+    public boolean isStreamEqual(@NonNull PlayQueueItem stream) {
+        return this.stream == stream;
+    }
+}

app/src/main/java/org/schabi/newpipe/player/mediasource/ManagedMediaSource.java

@@ -0,0 +1,27 @@
+package org.schabi.newpipe.player.mediasource;
+
+import android.support.annotation.NonNull;
+
+import com.google.android.exoplayer2.source.MediaSource;
+
+import org.schabi.newpipe.playlist.PlayQueueItem;
+
+public interface ManagedMediaSource extends MediaSource {
+    /**
+     * Determines whether or not this {@link ManagedMediaSource} can be replaced.
+     *
+     * @param newIdentity a stream the {@link ManagedMediaSource} should encapsulate over, if
+     *                    it is different from the existing stream in the
+     *                    {@link ManagedMediaSource}, then it should be replaced.
+     * @param isInterruptable specifies if this {@link ManagedMediaSource} potentially
+     *                        being played.
+     * */
+    boolean shouldBeReplacedWith(@NonNull final PlayQueueItem newIdentity,
+                                 final boolean isInterruptable);
+
+    /**
+     * Determines if the {@link PlayQueueItem} is the one the
+     * {@link ManagedMediaSource} encapsulates over.
+     * */
+    boolean isStreamEqual(@NonNull final PlayQueueItem stream);
+}

app/src/main/java/org/schabi/newpipe/player/mediasource/PlaceholderMediaSource.java

@@ -0,0 +1,31 @@
+package org.schabi.newpipe.player.mediasource;
+
+import android.support.annotation.NonNull;
+
+import com.google.android.exoplayer2.ExoPlayer;
+import com.google.android.exoplayer2.source.MediaPeriod;
+import com.google.android.exoplayer2.upstream.Allocator;
+
+import org.schabi.newpipe.playlist.PlayQueueItem;
+
+import java.io.IOException;
+
+public class PlaceholderMediaSource implements ManagedMediaSource {
+    // Do nothing, so this will stall the playback
+    @Override public void prepareSource(ExoPlayer player, boolean isTopLevelSource, Listener listener) {}
+    @Override public void maybeThrowSourceInfoRefreshError() throws IOException {}
+    @Override public MediaPeriod createPeriod(MediaPeriodId id, Allocator allocator) { return null; }
+    @Override public void releasePeriod(MediaPeriod mediaPeriod) {}
+    @Override public void releaseSource() {}
+
+    @Override
+    public boolean shouldBeReplacedWith(@NonNull PlayQueueItem newIdentity,
+                                        final boolean isInterruptable) {
+        return true;
+    }
+
+    @Override
+    public boolean isStreamEqual(@NonNull PlayQueueItem stream) {
+        return false;
+    }
+}

app/src/main/java/org/schabi/newpipe/player/playback/BasePlayerMediaSession.java

@@ -0,0 +1,77 @@
+package org.schabi.newpipe.player.playback;
+
+import android.net.Uri;
+import android.support.v4.media.MediaDescriptionCompat;
+
+import org.schabi.newpipe.player.BasePlayer;
+import org.schabi.newpipe.player.mediasession.MediaSessionCallback;
+import org.schabi.newpipe.playlist.PlayQueueItem;
+
+public class BasePlayerMediaSession implements MediaSessionCallback {
+    private BasePlayer player;
+
+    public BasePlayerMediaSession(final BasePlayer player) {
+        this.player = player;
+    }
+
+    @Override
+    public void onSkipToPrevious() {
+        player.onPlayPrevious();
+    }
+
+    @Override
+    public void onSkipToNext() {
+        player.onPlayNext();
+    }
+
+    @Override
+    public void onSkipToIndex(int index) {
+        if (player.getPlayQueue() == null) return;
+        player.onSelected(player.getPlayQueue().getItem(index));
+    }
+
+    @Override
+    public int getCurrentPlayingIndex() {
+        if (player.getPlayQueue() == null) return -1;
+        return player.getPlayQueue().getIndex();
+    }
+
+    @Override
+    public int getQueueSize() {
+        if (player.getPlayQueue() == null) return -1;
+        return player.getPlayQueue().size();
+    }
+
+    @Override
+    public MediaDescriptionCompat getQueueMetadata(int index) {
+        if (player.getPlayQueue() == null || player.getPlayQueue().getItem(index) == null) {
+            return null;
+        }
+
+        final PlayQueueItem item = player.getPlayQueue().getItem(index);
+        MediaDescriptionCompat.Builder descriptionBuilder = new MediaDescriptionCompat.Builder()
+                .setMediaId(String.valueOf(index))
+                .setTitle(item.getTitle())
+                .setSubtitle(item.getUploader());
+
+        final Uri thumbnailUri = Uri.parse(item.getThumbnailUrl());
+        if (thumbnailUri != null) descriptionBuilder.setIconUri(thumbnailUri);
+
+        return descriptionBuilder.build();
+    }
+
+    @Override
+    public void onPlay() {
+        player.onPlay();
+    }
+
+    @Override
+    public void onPause() {
+        player.onPause();
+    }
+
+    @Override
+    public void onSetShuffle(boolean isShuffled) {
+        player.onShuffleModeEnabledChanged(isShuffled);
+    }
+}

app/src/main/java/org/schabi/newpipe/player/playback/CustomTrackSelector.java

@@ -0,0 +1,114 @@
+package org.schabi.newpipe.player.playback;
+
+import android.support.annotation.NonNull;
+import android.text.TextUtils;
+
+import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.ExoPlaybackException;
+import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.source.TrackGroup;
+import com.google.android.exoplayer2.source.TrackGroupArray;
+import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
+import com.google.android.exoplayer2.trackselection.FixedTrackSelection;
+import com.google.android.exoplayer2.trackselection.TrackSelection;
+import com.google.android.exoplayer2.util.Assertions;
+import com.google.android.exoplayer2.util.Util;
+
+/**
+ * This class allows irregular text language labels for use when selecting text captions and
+ * is mostly a copy-paste from {@link DefaultTrackSelector}.
+ *
+ * This is a hack and should be removed once ExoPlayer fixes language normalization to accept
+ * a broader set of languages. 
+ * */
+public class CustomTrackSelector extends DefaultTrackSelector {
+    private static final int WITHIN_RENDERER_CAPABILITIES_BONUS = 1000;
+
+    private String preferredTextLanguage;
+
+    public CustomTrackSelector(TrackSelection.Factory adaptiveTrackSelectionFactory) {
+        super(adaptiveTrackSelectionFactory);
+    }
+
+    public String getPreferredTextLanguage() {
+        return preferredTextLanguage;
+    }
+
+    public void setPreferredTextLanguage(@NonNull final String label) {
+        Assertions.checkNotNull(label);
+        if (!label.equals(preferredTextLanguage)) {
+            preferredTextLanguage = label;
+            invalidate();
+        }
+    }
+
+    /** @see DefaultTrackSelector#formatHasLanguage(Format, String)*/
+    protected static boolean formatHasLanguage(Format format, String language) {
+        return language != null && TextUtils.equals(language, format.language);
+    }
+
+    /** @see DefaultTrackSelector#formatHasNoLanguage(Format)*/
+    protected static boolean formatHasNoLanguage(Format format) {
+        return TextUtils.isEmpty(format.language) || formatHasLanguage(format, C.LANGUAGE_UNDETERMINED);
+    }
+
+    /** @see DefaultTrackSelector#selectTextTrack(TrackGroupArray, int[][], Parameters) */
+    @Override
+    protected TrackSelection selectTextTrack(TrackGroupArray groups, int[][] formatSupport,
+                                             Parameters params) throws ExoPlaybackException {
+        TrackGroup selectedGroup = null;
+        int selectedTrackIndex = 0;
+        int selectedTrackScore = 0;
+        for (int groupIndex = 0; groupIndex < groups.length; groupIndex++) {
+            TrackGroup trackGroup = groups.get(groupIndex);
+            int[] trackFormatSupport = formatSupport[groupIndex];
+            for (int trackIndex = 0; trackIndex < trackGroup.length; trackIndex++) {
+                if (isSupported(trackFormatSupport[trackIndex],
+                        params.exceedRendererCapabilitiesIfNecessary)) {
+                    Format format = trackGroup.getFormat(trackIndex);
+                    int maskedSelectionFlags =
+                            format.selectionFlags & ~params.disabledTextTrackSelectionFlags;
+                    boolean isDefault = (maskedSelectionFlags & C.SELECTION_FLAG_DEFAULT) != 0;
+                    boolean isForced = (maskedSelectionFlags & C.SELECTION_FLAG_FORCED) != 0;
+                    int trackScore;
+                    boolean preferredLanguageFound = formatHasLanguage(format, preferredTextLanguage);
+                    if (preferredLanguageFound
+                            || (params.selectUndeterminedTextLanguage && formatHasNoLanguage(format))) {
+                        if (isDefault) {
+                            trackScore = 8;
+                        } else if (!isForced) {
+                            // Prefer non-forced to forced if a preferred text language has been specified. Where
+                            // both are provided the non-forced track will usually contain the forced subtitles as
+                            // a subset.
+                            trackScore = 6;
+                        } else {
+                            trackScore = 4;
+                        }
+                        trackScore += preferredLanguageFound ? 1 : 0;
+                    } else if (isDefault) {
+                        trackScore = 3;
+                    } else if (isForced) {
+                        if (formatHasLanguage(format, params.preferredAudioLanguage)) {
+                            trackScore = 2;
+                        } else {
+                            trackScore = 1;
+                        }
+                    } else {
+                        // Track should not be selected.
+                        continue;
+                    }
+                    if (isSupported(trackFormatSupport[trackIndex], false)) {
+                        trackScore += WITHIN_RENDERER_CAPABILITIES_BONUS;
+                    }
+                    if (trackScore > selectedTrackScore) {
+                        selectedGroup = trackGroup;
+                        selectedTrackIndex = trackIndex;
+                        selectedTrackScore = trackScore;
+                    }
+                }
+            }
+        }
+        return selectedGroup == null ? null
+                : new FixedTrackSelection(selectedGroup, selectedTrackIndex);
+    }
+}

app/src/main/java/org/schabi/newpipe/player/playback/DeferredMediaSource.java

@@ -1,216 +0,0 @@
-package org.schabi.newpipe.player.playback;
-
-import android.support.annotation.NonNull;
-import android.util.Log;
-
-import com.google.android.exoplayer2.ExoPlayer;
-import com.google.android.exoplayer2.source.MediaPeriod;
-import com.google.android.exoplayer2.source.MediaSource;
-import com.google.android.exoplayer2.upstream.Allocator;
-
-import org.schabi.newpipe.extractor.stream.StreamInfo;
-import org.schabi.newpipe.playlist.PlayQueueItem;
-
-import java.io.IOException;
-
-import io.reactivex.android.schedulers.AndroidSchedulers;
-import io.reactivex.disposables.Disposable;
-import io.reactivex.functions.Consumer;
-import io.reactivex.functions.Function;
-import io.reactivex.schedulers.Schedulers;
-
-/**
- * DeferredMediaSource is specifically designed to allow external control over when
- * the source metadata are loaded while being compatible with ExoPlayer's playlists.
- *
- * This media source follows the structure of how NewPipeExtractor's
- * {@link org.schabi.newpipe.extractor.stream.StreamInfoItem} is converted into
- * {@link org.schabi.newpipe.extractor.stream.StreamInfo}. Once conversion is complete,
- * this media source behaves identically as any other native media sources.
- * */
-public final class DeferredMediaSource implements MediaSource {
-    private final String TAG = "DeferredMediaSource@" + Integer.toHexString(hashCode());
-
-    /**
-     * This state indicates the {@link DeferredMediaSource} has just been initialized or reset.
-     * The source must be prepared and loaded again before playback.
-     * */
-    public final static int STATE_INIT = 0;
-    /**
-     * This state indicates the {@link DeferredMediaSource} has been prepared and is ready to load.
-     * */
-    public final static int STATE_PREPARED = 1;
-    /**
-     * This state indicates the {@link DeferredMediaSource} has been loaded without errors and
-     * is ready for playback.
-     * */
-    public final static int STATE_LOADED = 2;
-
-    public interface Callback {
-        /**
-         * Player-specific {@link com.google.android.exoplayer2.source.MediaSource} resolution
-         * from a given StreamInfo.
-         * */
-        MediaSource sourceOf(final PlayQueueItem item, final StreamInfo info);
-    }
-
-    private PlayQueueItem stream;
-    private Callback callback;
-    private int state;
-
-    private MediaSource mediaSource;
-
-    /* Custom internal objects */
-    private Disposable loader;
-    private ExoPlayer exoPlayer;
-    private Listener listener;
-    private Throwable error;
-
-    public DeferredMediaSource(@NonNull final PlayQueueItem stream,
-                               @NonNull final Callback callback) {
-        this.stream = stream;
-        this.callback = callback;
-        this.state = STATE_INIT;
-    }
-
-    /**
-     * Returns the current state of the {@link DeferredMediaSource}.
-     *
-     * @see DeferredMediaSource#STATE_INIT
-     * @see DeferredMediaSource#STATE_PREPARED
-     * @see DeferredMediaSource#STATE_LOADED
-     * */
-    public int state() {
-        return state;
-    }
-
-    /**
-     * Parameters are kept in the class for delayed preparation.
-     * */
-    @Override
-    public void prepareSource(ExoPlayer exoPlayer, boolean isTopLevelSource, Listener listener) {
-        this.exoPlayer = exoPlayer;
-        this.listener = listener;
-        this.state = STATE_PREPARED;
-    }
-
-    /**
-     * Externally controlled loading. This method fully prepares the source to be used
-     * like any other native {@link com.google.android.exoplayer2.source.MediaSource}.
-     *
-     * Ideally, this should be called after this source has entered PREPARED state and
-     * called once only.
-     *
-     * If loading fails here, an error will be propagated out and result in an
-     * {@link com.google.android.exoplayer2.ExoPlaybackException ExoPlaybackException},
-     * which is delegated to the player.
-     * */
-    public synchronized void load() {
-        if (stream == null) {
-            Log.e(TAG, "Stream Info missing, media source loading terminated.");
-            return;
-        }
-        if (state != STATE_PREPARED || loader != null) return;
-
-        Log.d(TAG, "Loading: [" + stream.getTitle() + "] with url: " + stream.getUrl());
-
-        loader = stream.getStream()
-                .map(streamInfo -> onStreamInfoReceived(stream, streamInfo))
-                .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(this::onMediaSourceReceived, this::onStreamInfoError);
-    }
-
-    private MediaSource onStreamInfoReceived(@NonNull final PlayQueueItem item,
-                                             @NonNull final StreamInfo info) throws Exception {
-        if (callback == null) {
-            throw new Exception("No available callback for resolving stream info.");
-        }
-
-        final MediaSource mediaSource = callback.sourceOf(item, info);
-
-        if (mediaSource == null) {
-            throw new Exception("Unable to resolve source from stream info. URL: " + stream.getUrl() +
-                    ", audio count: " + info.audio_streams.size() +
-                    ", video count: " + info.video_only_streams.size() + info.video_streams.size());
-        }
-
-        return mediaSource;
-    }
-
-    private void onMediaSourceReceived(final MediaSource mediaSource) throws Exception {
-        if (exoPlayer == null || listener == null || mediaSource == null) {
-            throw new Exception("MediaSource loading failed. URL: " + stream.getUrl());
-        }
-
-        Log.d(TAG, " Loaded: [" + stream.getTitle() + "] with url: " + stream.getUrl());
-        state = STATE_LOADED;
-
-        this.mediaSource = mediaSource;
-        this.mediaSource.prepareSource(exoPlayer, false, listener);
-    }
-
-    private void onStreamInfoError(final Throwable throwable) {
-        Log.e(TAG, "Loading error:", throwable);
-        error = throwable;
-        state = STATE_LOADED;
-    }
-
-    /**
-     * Delegate all errors to the player after {@link #load() load} is complete.
-     *
-     * Specifically, this method is called after an exception has occurred during loading or
-     * {@link com.google.android.exoplayer2.source.MediaSource#prepareSource(ExoPlayer, boolean, Listener) prepareSource}.
-     * */
-    @Override
-    public void maybeThrowSourceInfoRefreshError() throws IOException {
-        if (error != null) {
-            throw new IOException(error);
-        }
-
-        if (mediaSource != null) {
-            mediaSource.maybeThrowSourceInfoRefreshError();
-        }
-    }
-
-    @Override
-    public MediaPeriod createPeriod(MediaPeriodId mediaPeriodId, Allocator allocator) {
-        return mediaSource.createPeriod(mediaPeriodId, allocator);
-    }
-
-    /**
-     * Releases the media period (buffers).
-     *
-     * This may be called after {@link #releaseSource releaseSource}.
-     * */
-    @Override
-    public void releasePeriod(MediaPeriod mediaPeriod) {
-        mediaSource.releasePeriod(mediaPeriod);
-    }
-
-    /**
-     * Cleans up all internal custom objects creating during loading.
-     *
-     * This method is called when the parent {@link com.google.android.exoplayer2.source.MediaSource}
-     * is released or when the player is stopped.
-     *
-     * This method should not release or set null the resources passed in through the constructor.
-     * This method should not set null the internal {@link com.google.android.exoplayer2.source.MediaSource}.
-     * */
-    @Override
-    public void releaseSource() {
-        if (mediaSource != null) {
-            mediaSource.releaseSource();
-        }
-        if (loader != null) {
-            loader.dispose();
-        }
-
-        /* Do not set mediaSource as null here as it may be called through releasePeriod */
-        loader = null;
-        exoPlayer = null;
-        listener = null;
-        error = null;
-
-        state = STATE_INIT;
-    }
-}

app/src/main/java/org/schabi/newpipe/player/playback/MediaSourceManager.java

@@ -1,96 +1,157 @@
 package org.schabi.newpipe.player.playback;
 
+import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.util.Log;
 
 import com.google.android.exoplayer2.source.DynamicConcatenatingMediaSource;
+import com.google.android.exoplayer2.source.MediaSource;
+import com.google.android.exoplayer2.source.ShuffleOrder;
 
 import org.reactivestreams.Subscriber;
 import org.reactivestreams.Subscription;
 import org.schabi.newpipe.extractor.stream.StreamInfo;
+import org.schabi.newpipe.player.mediasource.FailedMediaSource;
+import org.schabi.newpipe.player.mediasource.LoadedMediaSource;
+import org.schabi.newpipe.player.mediasource.ManagedMediaSource;
+import org.schabi.newpipe.player.mediasource.PlaceholderMediaSource;
 import org.schabi.newpipe.playlist.PlayQueue;
 import org.schabi.newpipe.playlist.PlayQueueItem;
 import org.schabi.newpipe.playlist.events.MoveEvent;
 import org.schabi.newpipe.playlist.events.PlayQueueEvent;
 import org.schabi.newpipe.playlist.events.RemoveEvent;
+import org.schabi.newpipe.playlist.events.ReorderEvent;
+import org.schabi.newpipe.util.ServiceHelper;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
 
+import io.reactivex.Observable;
+import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;
-import io.reactivex.annotations.NonNull;
 import io.reactivex.disposables.CompositeDisposable;
 import io.reactivex.disposables.Disposable;
 import io.reactivex.disposables.SerialDisposable;
 import io.reactivex.functions.Consumer;
+import io.reactivex.internal.subscriptions.EmptySubscription;
 import io.reactivex.subjects.PublishSubject;
 
+import static org.schabi.newpipe.playlist.PlayQueue.DEBUG;
+
 public class MediaSourceManager {
-    private final String TAG = "MediaSourceManager@" + Integer.toHexString(hashCode());
-    // One-side rolling window size for default loading
-    // Effectively loads windowSize * 2 + 1 streams per call to load, must be greater than 0
-    private final int windowSize;
-    private final PlaybackListener playbackListener;
-    private final PlayQueue playQueue;
+    @NonNull private final String TAG = "MediaSourceManager@" + hashCode();
 
-    // Process only the last load order when receiving a stream of load orders (lessens I/O)
-    // The higher it is, the less loading occurs during rapid noncritical timeline changes
-    // Not recommended to go below 100ms
+    /**
+     * Determines how many streams before and after the current stream should be loaded.
+     * The default value (1) ensures seamless playback under typical network settings.
+     * <br><br>
+     * The streams after the current will be loaded into the playlist timeline while the
+     * streams before will only be cached for future usage.
+     *
+     * @see #onMediaSourceReceived(PlayQueueItem, ManagedMediaSource)
+     * @see #update(int, MediaSource, Runnable)
+     * */
+    private final static int WINDOW_SIZE = 1;
+
+    @NonNull private final PlaybackListener playbackListener;
+    @NonNull private final PlayQueue playQueue;
+
+    /**
+     * Determines the gap time between the playback position and the playback duration which
+     * the {@link #getEdgeIntervalSignal()} begins to request loading.
+     *
+     * @see #progressUpdateIntervalMillis
+     * */
+    private final long playbackNearEndGapMillis;
+    /**
+     * Determines the interval which the {@link #getEdgeIntervalSignal()} waits for between
+     * each request for loading, once {@link #playbackNearEndGapMillis} has reached.
+     * */
+    private final long progressUpdateIntervalMillis;
+    @NonNull private final Observable<Long> nearEndIntervalSignal;
+
+    /**
+     * Process only the last load order when receiving a stream of load orders (lessens I/O).
+     * <br><br>
+     * The higher it is, the less loading occurs during rapid noncritical timeline changes.
+     * <br><br>
+     * Not recommended to go below 100ms.
+     *
+     * @see #loadDebounced()
+     * */
     private final long loadDebounceMillis;
-    private final PublishSubject<Long> debouncedLoadSignal;
-    private final Disposable debouncedLoader;
+    @NonNull private final Disposable debouncedLoader;
+    @NonNull private final PublishSubject<Long> debouncedSignal;
 
-    private final DeferredMediaSource.Callback sourceBuilder;
+    @NonNull private Subscription playQueueReactor;
 
-    private DynamicConcatenatingMediaSource sources;
+    /**
+     * Determines the maximum number of disposables allowed in the {@link #loaderReactor}.
+     * Once exceeded, new calls to {@link #loadImmediate()} will evict all disposables in the
+     * {@link #loaderReactor} in order to load a new set of items.
+     *
+     * @see #loadImmediate()
+     * @see #maybeLoadItem(PlayQueueItem)
+     * */
+    private final static int MAXIMUM_LOADER_SIZE = WINDOW_SIZE * 2 + 1;
+    @NonNull private final CompositeDisposable loaderReactor;
+    @NonNull private final Set<PlayQueueItem> loadingItems;
+    @NonNull private final SerialDisposable syncReactor;
 
-    private Subscription playQueueReactor;
-    private SerialDisposable syncReactor;
+    @NonNull private final AtomicBoolean isBlocked;
 
-    private PlayQueueItem syncedItem;
-
-    private boolean isBlocked;
+    @NonNull private DynamicConcatenatingMediaSource sources;
 
     public MediaSourceManager(@NonNull final PlaybackListener listener,
                               @NonNull final PlayQueue playQueue) {
-        this(listener, playQueue, 1, 400L);
+        this(listener, playQueue, /*loadDebounceMillis=*/400L,
+                /*playbackNearEndGapMillis=*/TimeUnit.MILLISECONDS.convert(30, TimeUnit.SECONDS),
+                /*progressUpdateIntervalMillis*/TimeUnit.MILLISECONDS.convert(2, TimeUnit.SECONDS));
     }
 
     private MediaSourceManager(@NonNull final PlaybackListener listener,
                                @NonNull final PlayQueue playQueue,
-                               final int windowSize,
-                               final long loadDebounceMillis) {
-        if (windowSize <= 0) {
-            throw new UnsupportedOperationException("MediaSourceManager window size must be greater than 0");
+                               final long loadDebounceMillis,
+                               final long playbackNearEndGapMillis,
+                               final long progressUpdateIntervalMillis) {
+        if (playQueue.getBroadcastReceiver() == null) {
+            throw new IllegalArgumentException("Play Queue has not been initialized.");
+        }
+        if (playbackNearEndGapMillis < progressUpdateIntervalMillis) {
+            throw new IllegalArgumentException("Playback end gap=[" + playbackNearEndGapMillis +
+                    " ms] must be longer than update interval=[ " + progressUpdateIntervalMillis +
+                    " ms] for them to be useful.");
         }
 
         this.playbackListener = listener;
         this.playQueue = playQueue;
-        this.windowSize = windowSize;
-        this.loadDebounceMillis = loadDebounceMillis;
 
-        this.syncReactor = new SerialDisposable();
-        this.debouncedLoadSignal = PublishSubject.create();
+        this.playbackNearEndGapMillis = playbackNearEndGapMillis;
+        this.progressUpdateIntervalMillis = progressUpdateIntervalMillis;
+        this.nearEndIntervalSignal = getEdgeIntervalSignal();
+
+        this.loadDebounceMillis = loadDebounceMillis;
+        this.debouncedSignal = PublishSubject.create();
         this.debouncedLoader = getDebouncedLoader();
 
-        this.sourceBuilder = getSourceBuilder();
+        this.playQueueReactor = EmptySubscription.INSTANCE;
+        this.loaderReactor = new CompositeDisposable();
+        this.syncReactor = new SerialDisposable();
+
+        this.isBlocked = new AtomicBoolean(false);
 
         this.sources = new DynamicConcatenatingMediaSource();
 
+        this.loadingItems = Collections.synchronizedSet(new HashSet<>());
+
         playQueue.getBroadcastReceiver()
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(getReactor());
     }
 
-    /*//////////////////////////////////////////////////////////////////////////
-    // DeferredMediaSource listener
-    //////////////////////////////////////////////////////////////////////////*/
-
-    private DeferredMediaSource.Callback getSourceBuilder() {
-        return playbackListener::sourceOf;
-    }
-
     /*//////////////////////////////////////////////////////////////////////////
     // Exposed Methods
     //////////////////////////////////////////////////////////////////////////*/
@@ -98,38 +159,17 @@ public class MediaSourceManager {
      * Dispose the manager and releases all message buses and loaders.
      * */
     public void dispose() {
-        if (debouncedLoadSignal != null) debouncedLoadSignal.onComplete();
-        if (debouncedLoader != null) debouncedLoader.dispose();
-        if (playQueueReactor != null) playQueueReactor.cancel();
-        if (syncReactor != null) syncReactor.dispose();
-        if (sources != null) sources.releaseSource();
+        if (DEBUG) Log.d(TAG, "dispose() called.");
 
-        playQueueReactor = null;
-        syncReactor = null;
-        syncedItem = null;
-        sources = null;
+        debouncedSignal.onComplete();
+        debouncedLoader.dispose();
+
+        playQueueReactor.cancel();
+        loaderReactor.dispose();
+        syncReactor.dispose();
+        sources.releaseSource();
     }
 
-    /**
-     * Loads the current playing stream and the streams within its windowSize bound.
-     *
-     * Unblocks the player once the item at the current index is loaded.
-     * */
-    public void load() {
-        loadDebounced();
-    }
-
-    /**
-     * Blocks the player and repopulate the sources.
-     *
-     * Does not ensure the player is unblocked and should be done explicitly through {@link #load() load}.
-     * */
-    public void reset() {
-        tryBlock();
-
-        syncedItem = null;
-        populateSources();
-    }
     /*//////////////////////////////////////////////////////////////////////////
     // Event Reactor
     //////////////////////////////////////////////////////////////////////////*/
@@ -138,14 +178,14 @@ public class MediaSourceManager {
         return new Subscriber<PlayQueueEvent>() {
             @Override
             public void onSubscribe(@NonNull Subscription d) {
-                if (playQueueReactor != null) playQueueReactor.cancel();
+                playQueueReactor.cancel();
                 playQueueReactor = d;
                 playQueueReactor.request(1);
             }
 
             @Override
             public void onNext(@NonNull PlayQueueEvent playQueueMessage) {
-                if (playQueueReactor != null) onPlayQueueChanged(playQueueMessage);
+                onPlayQueueChanged(playQueueMessage);
             }
 
             @Override
@@ -158,20 +198,21 @@ public class MediaSourceManager {
 
     private void onPlayQueueChanged(final PlayQueueEvent event) {
         if (playQueue.isEmpty() && playQueue.isComplete()) {
-            playbackListener.shutdown();
+            playbackListener.onPlaybackShutdown();
             return;
         }
 
         // Event specific action
         switch (event.type()) {
             case INIT:
-            case REORDER:
             case ERROR:
-                reset();
-                break;
+                maybeBlock();
             case APPEND:
                 populateSources();
                 break;
+            case SELECT:
+                maybeRenewCurrentIndex();
+                break;
             case REMOVE:
                 final RemoveEvent removeEvent = (RemoveEvent) event;
                 remove(removeEvent.getRemoveIndex());
@@ -180,7 +221,12 @@ public class MediaSourceManager {
                 final MoveEvent moveEvent = (MoveEvent) event;
                 move(moveEvent.getFromIndex(), moveEvent.getToIndex());
                 break;
-            case SELECT:
+            case REORDER:
+                // Need to move to ensure the playing index from play queue matches that of
+                // the source timeline, and then window correction can take care of the rest
+                final ReorderEvent reorderEvent = (ReorderEvent) event;
+                move(reorderEvent.getFromSelectedIndex(), reorderEvent.getToSelectedIndex());
+                break;
             case RECOVERY:
             default:
                 break;
@@ -191,11 +237,11 @@ public class MediaSourceManager {
             case INIT:
             case REORDER:
             case ERROR:
+            case SELECT:
                 loadImmediate(); // low frequency, critical events
                 break;
             case APPEND:
             case REMOVE:
-            case SELECT:
             case MOVE:
             case RECOVERY:
             default:
@@ -204,157 +250,308 @@ public class MediaSourceManager {
         }
 
         if (!isPlayQueueReady()) {
-            tryBlock();
+            maybeBlock();
             playQueue.fetch();
         }
-        if (playQueueReactor != null) playQueueReactor.request(1);
+        playQueueReactor.request(1);
     }
 
     /*//////////////////////////////////////////////////////////////////////////
-    // Internal Helpers
+    // Playback Locking
     //////////////////////////////////////////////////////////////////////////*/
 
     private boolean isPlayQueueReady() {
-        return playQueue.isComplete() || playQueue.size() - playQueue.getIndex() > windowSize;
+        final boolean isWindowLoaded = playQueue.size() - playQueue.getIndex() > WINDOW_SIZE;
+        return playQueue.isComplete() || isWindowLoaded;
     }
 
-    private boolean tryBlock() {
-        if (!isBlocked) {
-            playbackListener.block();
-            resetSources();
-            isBlocked = true;
-            return true;
+    private boolean isPlaybackReady() {
+        if (sources.getSize() != playQueue.size()) return false;
+
+        final ManagedMediaSource mediaSource =
+                (ManagedMediaSource) sources.getMediaSource(playQueue.getIndex());
+        final PlayQueueItem playQueueItem = playQueue.getItem();
+        return mediaSource.isStreamEqual(playQueueItem);
+    }
+
+    private void maybeBlock() {
+        if (DEBUG) Log.d(TAG, "maybeBlock() called.");
+
+        if (isBlocked.get()) return;
+
+        playbackListener.onPlaybackBlock();
+        resetSources();
+
+        isBlocked.set(true);
+    }
+
+    private void maybeUnblock() {
+        if (DEBUG) Log.d(TAG, "maybeUnblock() called.");
+
+        if (isPlayQueueReady() && isPlaybackReady() && isBlocked.get()) {
+            isBlocked.set(false);
+            playbackListener.onPlaybackUnblock(sources);
         }
-        return false;
     }
 
-    private boolean tryUnblock() {
-        if (isPlayQueueReady() && isBlocked && sources != null) {
-            isBlocked = false;
-            playbackListener.unblock(sources);
-            return true;
-        }
-        return false;
-    }
+    /*//////////////////////////////////////////////////////////////////////////
+    // Metadata Synchronization
+    //////////////////////////////////////////////////////////////////////////*/
+
+    private void maybeSync() {
+        if (DEBUG) Log.d(TAG, "onPlaybackSynchronize() called.");
 
-    private void sync() {
         final PlayQueueItem currentItem = playQueue.getItem();
-        if (currentItem == null) return;
+        if (isBlocked.get() || !isPlaybackReady() || currentItem == null) return;
 
         final Consumer<StreamInfo> onSuccess = info -> syncInternal(currentItem, info);
-        final Consumer<Throwable> onError = throwable -> {
-            Log.e(TAG, "Sync error:", throwable);
-            syncInternal(currentItem, null);
-        };
+        final Consumer<Throwable> onError = throwable -> syncInternal(currentItem, null);
 
-        if (syncedItem != currentItem) {
-            syncedItem = currentItem;
-            final Disposable sync = currentItem.getStream()
-                    .observeOn(AndroidSchedulers.mainThread())
-                    .subscribe(onSuccess, onError);
-            syncReactor.set(sync);
-        }
+        final Disposable sync = currentItem.getStream()
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(onSuccess, onError);
+        syncReactor.set(sync);
     }
 
-    private void syncInternal(@android.support.annotation.NonNull final PlayQueueItem item,
+    private void syncInternal(@NonNull final PlayQueueItem item,
                               @Nullable final StreamInfo info) {
-        if (playQueue == null || playbackListener == null) return;
         // Ensure the current item is up to date with the play queue
-        if (playQueue.getItem() == item && playQueue.getItem() == syncedItem) {
-            playbackListener.sync(syncedItem,info);
+        if (playQueue.getItem() == item) {
+            playbackListener.onPlaybackSynchronize(item, info);
         }
     }
 
-    private void loadDebounced() {
-        debouncedLoadSignal.onNext(System.currentTimeMillis());
+    private void maybeSynchronizePlayer() {
+        maybeUnblock();
+        maybeSync();
     }
 
-    private void loadImmediate() {
-        // The current item has higher priority
-        final int currentIndex = playQueue.getIndex();
-        final PlayQueueItem currentItem = playQueue.getItem(currentIndex);
-        if (currentItem == null) return;
-        loadItem(currentItem);
+    /*//////////////////////////////////////////////////////////////////////////
+    // MediaSource Loading
+    //////////////////////////////////////////////////////////////////////////*/
 
-        // The rest are just for seamless playback
-        final int leftBound = Math.max(0, currentIndex - windowSize);
-        final int rightLimit = currentIndex + windowSize + 1;
-        final int rightBound = Math.min(playQueue.size(), rightLimit);
-        final List<PlayQueueItem> items = new ArrayList<>(playQueue.getStreams().subList(leftBound, rightBound));
-
-        // Do a round robin
-        final int excess = rightLimit - playQueue.size();
-        if (excess >= 0) items.addAll(playQueue.getStreams().subList(0, Math.min(playQueue.size(), excess)));
-
-        for (final PlayQueueItem item: items) loadItem(item);
-    }
-
-    private void loadItem(@Nullable final PlayQueueItem item) {
-        if (item == null) return;
-
-        final int index = playQueue.indexOf(item);
-        if (index > sources.getSize() - 1) return;
-
-        final DeferredMediaSource mediaSource = (DeferredMediaSource) sources.getMediaSource(playQueue.indexOf(item));
-        if (mediaSource.state() == DeferredMediaSource.STATE_PREPARED) mediaSource.load();
-
-        tryUnblock();
-        if (!isBlocked) sync();
-    }
-
-    private void resetSources() {
-        if (this.sources != null) this.sources.releaseSource();
-        this.sources = new DynamicConcatenatingMediaSource();
-    }
-
-    private void populateSources() {
-        if (sources == null) return;
-
-        for (final PlayQueueItem item : playQueue.getStreams()) {
-            insert(playQueue.indexOf(item), new DeferredMediaSource(item, sourceBuilder));
-        }
+    private Observable<Long> getEdgeIntervalSignal() {
+        return Observable.interval(progressUpdateIntervalMillis, TimeUnit.MILLISECONDS)
+                .filter(ignored -> playbackListener.isNearPlaybackEdge(playbackNearEndGapMillis));
     }
 
     private Disposable getDebouncedLoader() {
-        return debouncedLoadSignal
+        return debouncedSignal.mergeWith(nearEndIntervalSignal)
                 .debounce(loadDebounceMillis, TimeUnit.MILLISECONDS)
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(timestamp -> loadImmediate());
     }
+
+    private void loadDebounced() {
+        debouncedSignal.onNext(System.currentTimeMillis());
+    }
+
+    private void loadImmediate() {
+        if (DEBUG) Log.d(TAG, "MediaSource - loadImmediate() called");
+        // The current item has higher priority
+        final int currentIndex = playQueue.getIndex();
+        final PlayQueueItem currentItem = playQueue.getItem(currentIndex);
+        if (currentItem == null) return;
+
+        // Evict the items being loaded to free up memory
+        if (loaderReactor.size() > MAXIMUM_LOADER_SIZE) {
+            loaderReactor.clear();
+            loadingItems.clear();
+        }
+        maybeLoadItem(currentItem);
+
+        // The rest are just for seamless playback
+        // Although timeline is not updated prior to the current index, these sources are still
+        // loaded into the cache for faster retrieval at a potentially later time.
+        final int leftBound = Math.max(0, currentIndex - WINDOW_SIZE);
+        final int rightLimit = currentIndex + WINDOW_SIZE + 1;
+        final int rightBound = Math.min(playQueue.size(), rightLimit);
+        final Set<PlayQueueItem> items = new HashSet<>(
+                playQueue.getStreams().subList(leftBound,rightBound));
+
+        // Do a round robin
+        final int excess = rightLimit - playQueue.size();
+        if (excess >= 0) {
+            items.addAll(playQueue.getStreams().subList(0, Math.min(playQueue.size(), excess)));
+        }
+        items.remove(currentItem);
+
+        for (final PlayQueueItem item : items) {
+            maybeLoadItem(item);
+        }
+    }
+
+    private void maybeLoadItem(@NonNull final PlayQueueItem item) {
+        if (DEBUG) Log.d(TAG, "maybeLoadItem() called.");
+        if (playQueue.indexOf(item) >= sources.getSize()) return;
+
+        if (!loadingItems.contains(item) && isCorrectionNeeded(item)) {
+            if (DEBUG) Log.d(TAG, "MediaSource - Loading=[" + item.getTitle() +
+                    "] with url=[" + item.getUrl() + "]");
+
+            loadingItems.add(item);
+            final Disposable loader = getLoadedMediaSource(item)
+                    .observeOn(AndroidSchedulers.mainThread())
+                    /* No exception handling since getLoadedMediaSource guarantees nonnull return */
+                    .subscribe(mediaSource -> onMediaSourceReceived(item, mediaSource));
+            loaderReactor.add(loader);
+        }
+    }
+
+    private Single<ManagedMediaSource> getLoadedMediaSource(@NonNull final PlayQueueItem stream) {
+        return stream.getStream().map(streamInfo -> {
+            final MediaSource source = playbackListener.sourceOf(stream, streamInfo);
+            if (source == null) {
+                final Exception exception = new IllegalStateException(
+                        "Unable to resolve source from stream info." +
+                                " URL: " + stream.getUrl() +
+                                ", audio count: " + streamInfo.getAudioStreams().size() +
+                                ", video count: " + streamInfo.getVideoOnlyStreams().size() +
+                                streamInfo.getVideoStreams().size());
+                return new FailedMediaSource(stream, exception);
+            }
+
+            final long expiration = System.currentTimeMillis() +
+                    ServiceHelper.getCacheExpirationMillis(streamInfo.getServiceId());
+            return new LoadedMediaSource(source, stream, expiration);
+        }).onErrorReturn(throwable -> new FailedMediaSource(stream, throwable));
+    }
+
+    private void onMediaSourceReceived(@NonNull final PlayQueueItem item,
+                                       @NonNull final ManagedMediaSource mediaSource) {
+        if (DEBUG) Log.d(TAG, "MediaSource - Loaded=[" + item.getTitle() +
+                "] with url=[" + item.getUrl() + "]");
+
+        loadingItems.remove(item);
+
+        final int itemIndex = playQueue.indexOf(item);
+        // Only update the playlist timeline for items at the current index or after.
+        if (itemIndex >= playQueue.getIndex() && isCorrectionNeeded(item)) {
+            if (DEBUG) Log.d(TAG, "MediaSource - Updating index=[" + itemIndex + "] with " +
+                    "title=[" + item.getTitle() + "] at url=[" + item.getUrl() + "]");
+            update(itemIndex, mediaSource, this::maybeSynchronizePlayer);
+        }
+    }
+
+    /**
+     * Checks if the corresponding MediaSource in {@link DynamicConcatenatingMediaSource}
+     * for a given {@link PlayQueueItem} needs replacement, either due to gapless playback
+     * readiness or playlist desynchronization.
+     * <br><br>
+     * If the given {@link PlayQueueItem} is currently being played and is already loaded,
+     * then correction is not only needed if the playlist is desynchronized. Otherwise, the
+     * check depends on the status (e.g. expiration or placeholder) of the
+     * {@link ManagedMediaSource}.
+     * */
+    private boolean isCorrectionNeeded(@NonNull final PlayQueueItem item) {
+        final int index = playQueue.indexOf(item);
+        if (index == -1 || index >= sources.getSize()) return false;
+
+        final ManagedMediaSource mediaSource = (ManagedMediaSource) sources.getMediaSource(index);
+        return mediaSource.shouldBeReplacedWith(item,
+                /*mightBeInProgress=*/index != playQueue.getIndex());
+    }
+
+    /**
+     * Checks if the current playing index contains an expired {@link ManagedMediaSource}.
+     * If so, the expired source is replaced by a {@link PlaceholderMediaSource} and
+     * {@link #loadImmediate()} is called to reload the current item.
+     * <br><br>
+     * If not, then the media source at the current index is ready for playback, and
+     * {@link #maybeSynchronizePlayer()} is called.
+     * <br><br>
+     * Under both cases, {@link #maybeSync()} will be called to ensure the listener
+     * is up-to-date.
+     * */
+    private void maybeRenewCurrentIndex() {
+        final int currentIndex = playQueue.getIndex();
+        if (sources.getSize() <= currentIndex) return;
+
+        final ManagedMediaSource currentSource =
+                (ManagedMediaSource) sources.getMediaSource(currentIndex);
+        final PlayQueueItem currentItem = playQueue.getItem();
+        if (!currentSource.shouldBeReplacedWith(currentItem, /*canInterruptOnRenew=*/true)) {
+            maybeSynchronizePlayer();
+            return;
+        }
+
+        if (DEBUG) Log.d(TAG, "MediaSource - Reloading currently playing, " +
+                "index=[" + currentIndex + "], item=[" + currentItem.getTitle() + "]");
+        update(currentIndex, new PlaceholderMediaSource(), this::loadImmediate);
+    }
     /*//////////////////////////////////////////////////////////////////////////
-    // Media Source List Manipulation
+    // MediaSource Playlist Helpers
+    //////////////////////////////////////////////////////////////////////////*/
+
+    private void resetSources() {
+        if (DEBUG) Log.d(TAG, "resetSources() called.");
+
+        this.sources.releaseSource();
+        this.sources = new DynamicConcatenatingMediaSource(false,
+                // Shuffling is done on PlayQueue, thus no need to use ExoPlayer's shuffle order
+                new ShuffleOrder.UnshuffledShuffleOrder(0));
+    }
+
+    private void populateSources() {
+        if (DEBUG) Log.d(TAG, "populateSources() called.");
+        if (sources.getSize() >= playQueue.size()) return;
+
+        for (int index = sources.getSize() - 1; index < playQueue.size(); index++) {
+            emplace(index, new PlaceholderMediaSource());
+        }
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // MediaSource Playlist Manipulation
     //////////////////////////////////////////////////////////////////////////*/
 
     /**
-     * Inserts a source into {@link DynamicConcatenatingMediaSource} with position
-     * in respect to the play queue.
-     *
-     * If the play queue index already exists, then the insert is ignored.
+     * Places a {@link MediaSource} into the {@link DynamicConcatenatingMediaSource}
+     * with position in respect to the play queue only if no {@link MediaSource}
+     * already exists at the given index.
      * */
-    private void insert(final int queueIndex, final DeferredMediaSource source) {
-        if (sources == null) return;
-        if (queueIndex < 0 || queueIndex < sources.getSize()) return;
+    private synchronized void emplace(final int index, @NonNull final MediaSource source) {
+        if (index < sources.getSize()) return;
 
-        sources.addMediaSource(queueIndex, source);
+        sources.addMediaSource(index, source);
     }
 
     /**
-     * Removes a source from {@link DynamicConcatenatingMediaSource} with the given play queue index.
-     *
-     * If the play queue index does not exist, the removal is ignored.
+     * Removes a {@link MediaSource} from {@link DynamicConcatenatingMediaSource}
+     * at the given index. If this index is out of bound, then the removal is ignored.
      * */
-    private void remove(final int queueIndex) {
-        if (sources == null) return;
-        if (queueIndex < 0 || queueIndex > sources.getSize()) return;
+    private synchronized void remove(final int index) {
+        if (index < 0 || index > sources.getSize()) return;
 
-        sources.removeMediaSource(queueIndex);
+        sources.removeMediaSource(index);
     }
 
-    private void move(final int source, final int target) {
-        if (sources == null) return;
+    /**
+     * Moves a {@link MediaSource} in {@link DynamicConcatenatingMediaSource}
+     * from the given source index to the target index. If either index is out of bound,
+     * then the call is ignored.
+     * */
+    private synchronized void move(final int source, final int target) {
         if (source < 0 || target < 0) return;
         if (source >= sources.getSize() || target >= sources.getSize()) return;
 
         sources.moveMediaSource(source, target);
     }
+
+    /**
+     * Updates the {@link MediaSource} in {@link DynamicConcatenatingMediaSource}
+     * at the given index with a given {@link MediaSource}. If the index is out of bound,
+     * then the replacement is ignored.
+     * <br><br>
+     * Not recommended to use on indices LESS THAN the currently playing index, since
+     * this will modify the playback timeline prior to the index and may cause desynchronization
+     * on the playing item between {@link PlayQueue} and {@link DynamicConcatenatingMediaSource}.
+     * */
+    private synchronized void update(final int index, @NonNull final MediaSource source,
+                                     @Nullable final Runnable finalizingAction) {
+        if (index < 0 || index >= sources.getSize()) return;
+
+        sources.addMediaSource(index + 1, source, () ->
+                sources.removeMediaSource(index, finalizingAction));
+    }
 }

app/src/main/java/org/schabi/newpipe/player/playback/PlaybackListener.java

@@ -11,6 +11,16 @@ import org.schabi.newpipe.playlist.PlayQueueItem;
 import java.util.List;
 
 public interface PlaybackListener {
+
+    /**
+     * Called to check if the currently playing stream is close to the end of its playback.
+     * Implementation should return true when the current playback position is within
+     * timeToEndMillis or less until its playback completes or transitions.
+     *
+     * May be called at any time.
+     * */
+    boolean isNearPlaybackEdge(final long timeToEndMillis);
+
     /**
      * Called when the stream at the current queue index is not ready yet.
      * Signals to the listener to block the player from playing anything and notify the source
@@ -18,7 +28,7 @@ public interface PlaybackListener {
      *
      * May be called at any time.
      * */
-    void block();
+    void onPlaybackBlock();
 
     /**
      * Called when the stream at the current queue index is ready.
@@ -26,18 +36,16 @@ public interface PlaybackListener {
      *
      * May be called only when the player is blocked.
      * */
-    void unblock(final MediaSource mediaSource);
+    void onPlaybackUnblock(final MediaSource mediaSource);
 
     /**
      * Called when the queue index is refreshed.
      * Signals to the listener to synchronize the player's window to the manager's
      * window.
      *
-     * Occurs once only per play queue item change.
-     *
-     * May be called only after unblock is called.
+     * May be called anytime at any amount once unblock is called.
      * */
-    void sync(@NonNull final PlayQueueItem item, @Nullable final StreamInfo info);
+    void onPlaybackSynchronize(@NonNull final PlayQueueItem item, @Nullable final StreamInfo info);
 
     /**
      * Requests the listener to resolve a stream info into a media source
@@ -55,5 +63,5 @@ public interface PlaybackListener {
      *
      * May be called at any time.
      * */
-    void shutdown();
+    void onPlaybackShutdown();
 }

app/src/main/java/org/schabi/newpipe/playlist/AbstractInfoPlayQueue.java

@@ -26,13 +26,13 @@ abstract class AbstractInfoPlayQueue<T extends ListInfo, U extends InfoItem> ext
     transient Disposable fetchReactor;
 
     AbstractInfoPlayQueue(final U item) {
-        this(item.getServiceId(), item.getUrl(), null, Collections.<InfoItem>emptyList(), 0);
+        this(item.getServiceId(), item.getUrl(), null, Collections.<StreamInfoItem>emptyList(), 0);
     }
 
     AbstractInfoPlayQueue(final int serviceId,
                           final String url,
                           final String nextPageUrl,
-                          final List<InfoItem> streams,
+                          final List<StreamInfoItem> streams,
                           final int index) {
         super(index, extractListItems(streams));
 
@@ -65,10 +65,10 @@ abstract class AbstractInfoPlayQueue<T extends ListInfo, U extends InfoItem> ext
             @Override
             public void onSuccess(@NonNull T result) {
                 isInitial = false;
-                if (!result.has_more_streams) isComplete = true;
-                nextUrl = result.next_streams_url;
+                if (!result.hasNextPage()) isComplete = true;
+                nextUrl = result.getNextPageUrl();
 
-                append(extractListItems(result.related_streams));
+                append(extractListItems(result.getRelatedItems()));
 
                 fetchReactor.dispose();
                 fetchReactor = null;
@@ -83,8 +83,8 @@ abstract class AbstractInfoPlayQueue<T extends ListInfo, U extends InfoItem> ext
         };
     }
 
-    SingleObserver<ListExtractor.NextItemsResult> getNextItemsObserver() {
-        return new SingleObserver<ListExtractor.NextItemsResult>() {
+    SingleObserver<ListExtractor.InfoItemsPage> getNextPageObserver() {
+        return new SingleObserver<ListExtractor.InfoItemsPage>() {
             @Override
             public void onSubscribe(@NonNull Disposable d) {
                 if (isComplete || isInitial || (fetchReactor != null && !fetchReactor.isDisposed())) {
@@ -95,11 +95,11 @@ abstract class AbstractInfoPlayQueue<T extends ListInfo, U extends InfoItem> ext
             }
 
             @Override
-            public void onSuccess(@NonNull ListExtractor.NextItemsResult result) {
-                if (!result.hasMoreStreams()) isComplete = true;
-                nextUrl = result.nextItemsUrl;
+            public void onSuccess(@NonNull ListExtractor.InfoItemsPage result) {
+                if (!result.hasNextPage()) isComplete = true;
+                nextUrl = result.getNextPageUrl();
 
-                append(extractListItems(result.nextItemsList));
+                append(extractListItems(result.getItems()));
 
                 fetchReactor.dispose();
                 fetchReactor = null;
@@ -118,9 +118,10 @@ abstract class AbstractInfoPlayQueue<T extends ListInfo, U extends InfoItem> ext
     public void dispose() {
         super.dispose();
         if (fetchReactor != null) fetchReactor.dispose();
+        fetchReactor = null;
     }
 
-    private static List<PlayQueueItem> extractListItems(final List<InfoItem> infos) {
+    private static List<PlayQueueItem> extractListItems(final List<StreamInfoItem> infos) {
         List<PlayQueueItem> result = new ArrayList<>();
         for (final InfoItem stream : infos) {
             if (stream instanceof StreamInfoItem) {

app/src/main/java/org/schabi/newpipe/playlist/ChannelPlayQueue.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.playlist;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.channel.ChannelInfo;
 import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
+import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.util.ExtractorHelper;
 
 import java.util.List;
@@ -16,13 +17,13 @@ public final class ChannelPlayQueue extends AbstractInfoPlayQueue<ChannelInfo, C
     }
 
     public ChannelPlayQueue(final ChannelInfo info) {
-        this(info.getServiceId(), info.getUrl(), info.getNextStreamsUrl(), info.getRelatedStreams(), 0);
+        this(info.getServiceId(), info.getUrl(), info.getNextPageUrl(), info.getRelatedItems(), 0);
     }
 
     public ChannelPlayQueue(final int serviceId,
                             final String url,
                             final String nextPageUrl,
-                            final List<InfoItem> streams,
+                            final List<StreamInfoItem> streams,
                             final int index) {
         super(serviceId, url, nextPageUrl, streams, index);
     }
@@ -43,7 +44,7 @@ public final class ChannelPlayQueue extends AbstractInfoPlayQueue<ChannelInfo, C
             ExtractorHelper.getMoreChannelItems(this.serviceId, this.baseUrl, this.nextUrl)
                     .subscribeOn(Schedulers.io())
                     .observeOn(AndroidSchedulers.mainThread())
-                    .subscribe(getNextItemsObserver());
+                    .subscribe(getNextPageObserver());
         }
     }
 }

app/src/main/java/org/schabi/newpipe/playlist/PlayQueue.java

@@ -1,6 +1,7 @@
 package org.schabi.newpipe.playlist;
 
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.util.Log;
 
 import org.reactivestreams.Subscriber;
@@ -44,7 +45,7 @@ public abstract class PlayQueue implements Serializable {
 
     private ArrayList<PlayQueueItem> backup;
     private ArrayList<PlayQueueItem> streams;
-    private final AtomicInteger queueIndex;
+    @NonNull private final AtomicInteger queueIndex;
 
     private transient BehaviorSubject<PlayQueueEvent> eventBroadcast;
     private transient Flowable<PlayQueueEvent> broadcastReceiver;
@@ -83,6 +84,7 @@ public abstract class PlayQueue implements Serializable {
         if (eventBroadcast != null) eventBroadcast.onComplete();
         if (reportingReactor != null) reportingReactor.cancel();
 
+        eventBroadcast = null;
         broadcastReceiver = null;
         reportingReactor = null;
     }
@@ -131,7 +133,7 @@ public abstract class PlayQueue implements Serializable {
      * Returns the index of the given item using referential equality.
      * May be null despite play queue contains identical item.
      * */
-    public int indexOf(final PlayQueueItem item) {
+    public int indexOf(@NonNull final PlayQueueItem item) {
         // referential equality, can't think of a better way to do this
         // todo: better than this
         return streams.indexOf(item);
@@ -170,7 +172,7 @@ public abstract class PlayQueue implements Serializable {
      * Returns the play queue's update broadcast.
      * May be null if the play queue message bus is not initialized.
      * */
-    @NonNull
+    @Nullable
     public Flowable<PlayQueueEvent> getBroadcastReceiver() {
         return broadcastReceiver;
     }
@@ -211,7 +213,7 @@ public abstract class PlayQueue implements Serializable {
      *
      * @see #append(List items)
      * */
-    public synchronized void append(final PlayQueueItem... items) {
+    public synchronized void append(@NonNull final PlayQueueItem... items) {
         append(Arrays.asList(items));
     }
 
@@ -223,7 +225,7 @@ public abstract class PlayQueue implements Serializable {
      *
      * Will emit a {@link AppendEvent} on any given context.
      * */
-    public synchronized void append(final List<PlayQueueItem> items) {
+    public synchronized void append(@NonNull final List<PlayQueueItem> items) {
         List<PlayQueueItem> itemList = new ArrayList<>(items);
 
         if (isShuffled()) {
@@ -349,6 +351,7 @@ public abstract class PlayQueue implements Serializable {
         if (backup == null) {
             backup = new ArrayList<>(streams);
         }
+        final int originIndex = getIndex();
         final PlayQueueItem current = getItem();
         Collections.shuffle(streams);
 
@@ -358,7 +361,7 @@ public abstract class PlayQueue implements Serializable {
         }
         queueIndex.set(0);
 
-        broadcast(new ReorderEvent());
+        broadcast(new ReorderEvent(originIndex, queueIndex.get()));
     }
 
     /**
@@ -371,6 +374,7 @@ public abstract class PlayQueue implements Serializable {
      * */
     public synchronized void unshuffle() {
         if (backup == null) return;
+        final int originIndex = getIndex();
         final PlayQueueItem current = getItem();
 
         streams.clear();
@@ -384,14 +388,14 @@ public abstract class PlayQueue implements Serializable {
             queueIndex.set(0);
         }
 
-        broadcast(new ReorderEvent());
+        broadcast(new ReorderEvent(originIndex, queueIndex.get()));
     }
 
     /*//////////////////////////////////////////////////////////////////////////
     // Rx Broadcast
     //////////////////////////////////////////////////////////////////////////*/
 
-    private void broadcast(final PlayQueueEvent event) {
+    private void broadcast(@NonNull final PlayQueueEvent event) {
         if (eventBroadcast != null) {
             eventBroadcast.onNext(event);
         }

app/src/main/java/org/schabi/newpipe/playlist/PlayQueueAdapter.java

@@ -63,22 +63,18 @@ public class PlayQueueAdapter extends RecyclerView.Adapter<RecyclerView.ViewHold
     }
 
     public PlayQueueAdapter(final Context context, final PlayQueue playQueue) {
+        if (playQueue.getBroadcastReceiver() == null) {
+            throw new IllegalStateException("Play Queue has not been initialized.");
+        }
+
         this.playQueueItemBuilder = new PlayQueueItemBuilder(context);
         this.playQueue = playQueue;
 
-        startReactor();
+        playQueue.getBroadcastReceiver().toObservable().subscribe(getReactor());
     }
 
-    public void setSelectedListener(final PlayQueueItemBuilder.OnSelectedListener listener) {
-        playQueueItemBuilder.setOnSelectedListener(listener);
-    }
-
-    public void unsetSelectedListener() {
-        playQueueItemBuilder.setOnSelectedListener(null);
-    }
-
-    private void startReactor() {
-        final Observer<PlayQueueEvent> observer = new Observer<PlayQueueEvent>() {
+    private Observer<PlayQueueEvent> getReactor() {
+        return new Observer<PlayQueueEvent>() {
             @Override
             public void onSubscribe(@NonNull Disposable d) {
                 if (playQueueReactor != null) playQueueReactor.dispose();
@@ -99,7 +95,6 @@ public class PlayQueueAdapter extends RecyclerView.Adapter<RecyclerView.ViewHold
             }
         };
 
-        playQueue.getBroadcastReceiver().toObservable().subscribe(observer);
     }
 
     private void onPlayQueueChanged(final PlayQueueEvent message) {
@@ -146,6 +141,14 @@ public class PlayQueueAdapter extends RecyclerView.Adapter<RecyclerView.ViewHold
         playQueueReactor = null;
     }
 
+    public void setSelectedListener(final PlayQueueItemBuilder.OnSelectedListener listener) {
+        playQueueItemBuilder.setOnSelectedListener(listener);
+    }
+
+    public void unsetSelectedListener() {
+        playQueueItemBuilder.setOnSelectedListener(null);
+    }
+
     public void setFooter(View footer) {
         this.footer = footer;
         notifyItemChanged(playQueue.size());

app/src/main/java/org/schabi/newpipe/playlist/PlayQueueItem.java

@@ -11,20 +11,19 @@ import org.schabi.newpipe.util.ExtractorHelper;
 import java.io.Serializable;
 
 import io.reactivex.Single;
-import io.reactivex.android.schedulers.AndroidSchedulers;
-import io.reactivex.functions.Consumer;
 import io.reactivex.schedulers.Schedulers;
 
 public class PlayQueueItem implements Serializable {
-    final public static long RECOVERY_UNSET = Long.MIN_VALUE;
+    public final static long RECOVERY_UNSET = Long.MIN_VALUE;
+    private final static String EMPTY_STRING = "";
 
-    final private String title;
-    final private String url;
+    @NonNull final private String title;
+    @NonNull final private String url;
     final private int serviceId;
     final private long duration;
-    final private String thumbnailUrl;
-    final private String uploader;
-    final private StreamType streamType;
+    @NonNull final private String thumbnailUrl;
+    @NonNull final private String uploader;
+    @NonNull final private StreamType streamType;
 
     private long recoveryPosition;
     private Throwable error;
@@ -42,15 +41,16 @@ public class PlayQueueItem implements Serializable {
                 item.getThumbnailUrl(), item.getUploaderName(), item.getStreamType());
     }
 
-    private PlayQueueItem(final String name, final String url, final int serviceId,
-                          final long duration, final String thumbnailUrl, final String uploader,
-                          final StreamType streamType) {
-        this.title = name;
-        this.url = url;
+    private PlayQueueItem(@Nullable final String name, @Nullable final String url,
+                          final int serviceId, final long duration,
+                          @Nullable final String thumbnailUrl, @Nullable final String uploader,
+                          @NonNull final StreamType streamType) {
+        this.title = name != null ? name : EMPTY_STRING;
+        this.url = url != null ? url : EMPTY_STRING;
         this.serviceId = serviceId;
         this.duration = duration;
-        this.thumbnailUrl = thumbnailUrl;
-        this.uploader = uploader;
+        this.thumbnailUrl = thumbnailUrl != null ? thumbnailUrl : EMPTY_STRING;
+        this.uploader = uploader != null ? uploader : EMPTY_STRING;
         this.streamType = streamType;
 
         this.recoveryPosition = RECOVERY_UNSET;
@@ -84,6 +84,7 @@ public class PlayQueueItem implements Serializable {
         return uploader;
     }
 
+    @NonNull
     public StreamType getStreamType() {
         return streamType;
     }

app/src/main/java/org/schabi/newpipe/playlist/PlayQueueItemBuilder.java

@@ -1,28 +1,22 @@
 package org.schabi.newpipe.playlist;
 
 import android.content.Context;
-import android.graphics.Bitmap;
 import android.text.TextUtils;
 import android.view.MotionEvent;
 import android.view.View;
 
 import com.nostra13.universalimageloader.core.DisplayImageOptions;
 import com.nostra13.universalimageloader.core.ImageLoader;
-import com.nostra13.universalimageloader.core.assist.ImageScaleType;
-import com.nostra13.universalimageloader.core.process.BitmapProcessor;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.util.ImageDisplayConstants;
 import org.schabi.newpipe.util.Localization;
 
-
 public class PlayQueueItemBuilder {
 
     private static final String TAG = PlayQueueItemBuilder.class.toString();
 
-    private final int thumbnailWidthPx;
-    private final int thumbnailHeightPx;
-    private final DisplayImageOptions imageOptions;
-
     public interface OnSelectedListener {
         void selected(PlayQueueItem item, View view);
         void held(PlayQueueItem item, View view);
@@ -31,11 +25,7 @@ public class PlayQueueItemBuilder {
 
     private OnSelectedListener onItemClickListener;
 
-    public PlayQueueItemBuilder(final Context context) {
-        thumbnailWidthPx = context.getResources().getDimensionPixelSize(R.dimen.play_queue_thumbnail_width);
-        thumbnailHeightPx = context.getResources().getDimensionPixelSize(R.dimen.play_queue_thumbnail_height);
-        imageOptions = buildImageOptions(thumbnailWidthPx, thumbnailHeightPx);
-    }
+    public PlayQueueItemBuilder(final Context context) {}
 
     public void setOnSelectedListener(OnSelectedListener listener) {
         this.onItemClickListener = listener;
@@ -43,7 +33,8 @@ public class PlayQueueItemBuilder {
 
     public void buildStreamInfoItem(final PlayQueueItemHolder holder, final PlayQueueItem item) {
         if (!TextUtils.isEmpty(item.getTitle())) holder.itemVideoTitleView.setText(item.getTitle());
-        if (!TextUtils.isEmpty(item.getUploader())) holder.itemAdditionalDetailsView.setText(item.getUploader());
+        holder.itemAdditionalDetailsView.setText(Localization.concatenateStrings(item.getUploader(),
+                NewPipe.getNameOfService(item.getServiceId())));
 
         if (item.getDuration() > 0) {
             holder.itemDurationView.setText(Localization.getDurationString(item.getDuration()));
@@ -51,7 +42,8 @@ public class PlayQueueItemBuilder {
             holder.itemDurationView.setVisibility(View.GONE);
         }
 
-        ImageLoader.getInstance().displayImage(item.getThumbnailUrl(), holder.itemThumbnailView, imageOptions);
+        ImageLoader.getInstance().displayImage(item.getThumbnailUrl(), holder.itemThumbnailView,
+                ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS);
 
         holder.itemRoot.setOnClickListener(view -> {
             if (onItemClickListener != null) {
@@ -81,23 +73,4 @@ public class PlayQueueItemBuilder {
             return false;
         };
     }
-
-    private DisplayImageOptions buildImageOptions(final int widthPx, final int heightPx) {
-        final BitmapProcessor bitmapProcessor = bitmap -> {
-            final Bitmap resizedBitmap = Bitmap.createScaledBitmap(bitmap, widthPx, heightPx, false);
-            bitmap.recycle();
-            return resizedBitmap;
-        };
-
-        return new DisplayImageOptions.Builder()
-                .showImageOnFail(R.drawable.dummy_thumbnail)
-                .showImageForEmptyUri(R.drawable.dummy_thumbnail)
-                .showImageOnLoading(R.drawable.dummy_thumbnail)
-                .bitmapConfig(Bitmap.Config.RGB_565) // Users won't be able to see much anyways
-                .preProcessor(bitmapProcessor)
-                .imageScaleType(ImageScaleType.EXACTLY)
-                .cacheInMemory(true)
-                .cacheOnDisk(true)
-                .build();
-    }
 }

app/src/main/java/org/schabi/newpipe/playlist/PlayQueueItemTouchCallback.java

@@ -0,0 +1,52 @@
+package org.schabi.newpipe.playlist;
+
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+
+public abstract class PlayQueueItemTouchCallback extends ItemTouchHelper.SimpleCallback {
+    private static final int MINIMUM_INITIAL_DRAG_VELOCITY = 10;
+    private static final int MAXIMUM_INITIAL_DRAG_VELOCITY = 25;
+
+    public PlayQueueItemTouchCallback() {
+        super(ItemTouchHelper.UP | ItemTouchHelper.DOWN, 0);
+    }
+
+    public abstract void onMove(final int sourceIndex, final int targetIndex);
+
+    @Override
+    public int interpolateOutOfBoundsScroll(RecyclerView recyclerView, int viewSize,
+                                            int viewSizeOutOfBounds, int totalSize,
+                                            long msSinceStartScroll) {
+        final int standardSpeed = super.interpolateOutOfBoundsScroll(recyclerView, viewSize,
+                viewSizeOutOfBounds, totalSize, msSinceStartScroll);
+        final int clampedAbsVelocity = Math.max(MINIMUM_INITIAL_DRAG_VELOCITY,
+                Math.min(Math.abs(standardSpeed), MAXIMUM_INITIAL_DRAG_VELOCITY));
+        return clampedAbsVelocity * (int) Math.signum(viewSizeOutOfBounds);
+    }
+
+    @Override
+    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder source,
+                          RecyclerView.ViewHolder target) {
+        if (source.getItemViewType() != target.getItemViewType()) {
+            return false;
+        }
+
+        final int sourceIndex = source.getLayoutPosition();
+        final int targetIndex = target.getLayoutPosition();
+        onMove(sourceIndex, targetIndex);
+        return true;
+    }
+
+    @Override
+    public boolean isLongPressDragEnabled() {
+        return false;
+    }
+
+    @Override
+    public boolean isItemViewSwipeEnabled() {
+        return false;
+    }
+
+    @Override
+    public void onSwiped(RecyclerView.ViewHolder viewHolder, int swipeDir) {}
+}

app/src/main/java/org/schabi/newpipe/playlist/PlaylistPlayQueue.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.playlist;
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.playlist.PlaylistInfo;
 import org.schabi.newpipe.extractor.playlist.PlaylistInfoItem;
+import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.util.ExtractorHelper;
 
 import java.util.List;
@@ -16,13 +17,13 @@ public final class PlaylistPlayQueue extends AbstractInfoPlayQueue<PlaylistInfo,
     }
 
     public PlaylistPlayQueue(final PlaylistInfo info) {
-        this(info.getServiceId(), info.getUrl(), info.getNextStreamsUrl(), info.getRelatedStreams(), 0);
+        this(info.getServiceId(), info.getUrl(), info.getNextPageUrl(), info.getRelatedItems(), 0);
     }
 
     public PlaylistPlayQueue(final int serviceId,
                              final String url,
                              final String nextPageUrl,
-                             final List<InfoItem> streams,
+                             final List<StreamInfoItem> streams,
                              final int index) {
         super(serviceId, url, nextPageUrl, streams, index);
     }
@@ -43,7 +44,7 @@ public final class PlaylistPlayQueue extends AbstractInfoPlayQueue<PlaylistInfo,
             ExtractorHelper.getMorePlaylistItems(this.serviceId, this.baseUrl, this.nextUrl)
                     .subscribeOn(Schedulers.io())
                     .observeOn(AndroidSchedulers.mainThread())
-                    .subscribe(getNextItemsObserver());
+                    .subscribe(getNextPageObserver());
         }
     }
 }

app/src/main/java/org/schabi/newpipe/playlist/events/ReorderEvent.java

@@ -1,12 +1,24 @@
 package org.schabi.newpipe.playlist.events;
 
 public class ReorderEvent implements PlayQueueEvent {
+    private final int fromSelectedIndex;
+    private final int toSelectedIndex;
+
     @Override
     public PlayQueueEventType type() {
         return PlayQueueEventType.REORDER;
     }
 
-    public ReorderEvent() {
+    public ReorderEvent(final int fromSelectedIndex, final int toSelectedIndex) {
+        this.fromSelectedIndex = fromSelectedIndex;
+        this.toSelectedIndex = toSelectedIndex;
+    }
 
+    public int getFromSelectedIndex() {
+        return fromSelectedIndex;
+    }
+
+    public int getToSelectedIndex() {
+        return toSelectedIndex;
     }
 }

app/src/main/java/org/schabi/newpipe/report/ErrorActivity.java

@@ -77,12 +77,10 @@ public class ErrorActivity extends AppCompatActivity {
 
     public static final String ERROR_EMAIL_ADDRESS = "crashreport@newpipe.schabi.org";
     public static final String ERROR_EMAIL_SUBJECT = "Exception in NewPipe " + BuildConfig.VERSION_NAME;
-    Thread globIpRangeThread;
     private String[] errorList;
     private ErrorInfo errorInfo;
     private Class returnActivity;
     private String currentTimeStamp;
-    private String globIpRange;
     // views
     private TextView errorView;
     private EditText userCommentBox;
@@ -224,9 +222,6 @@ public class ErrorActivity extends AppCompatActivity {
         });
         reportButton.setEnabled(false);
 
-        globIpRangeThread = new Thread(new IpRangeRequester());
-        globIpRangeThread.start();
-
         // normal bugreport
         buildInfo(errorInfo);
         if (errorInfo.message != 0) {
@@ -342,8 +337,7 @@ public class ErrorActivity extends AppCompatActivity {
                     .put("package", getPackageName())
                     .put("version", BuildConfig.VERSION_NAME)
                     .put("os", getOsString())
-                    .put("time", currentTimeStamp)
-                    .put("ip_range", globIpRange);
+                    .put("time", currentTimeStamp);
 
             JSONArray exceptionArray = new JSONArray();
             if (errorList != null) {
@@ -454,41 +448,4 @@ public class ErrorActivity extends AppCompatActivity {
             dest.writeInt(this.message);
         }
     }
-
-    private class IpRangeRequester implements Runnable {
-        Handler h = new Handler();
-
-        public void run() {
-            String ipRange = "none";
-            try {
-                Downloader dl = Downloader.getInstance();
-                String ip = dl.download("https://ipv4.icanhazip.com");
-
-                ipRange = Parser.matchGroup1("([0-9]*\\.[0-9]*\\.)[0-9]*\\.[0-9]*", ip)
-                        + "0.0";
-            } catch (Throwable e) {
-                Log.w(TAG, "Error while error: could not get iprange", e);
-            } finally {
-                h.post(new IpRangeReturnRunnable(ipRange));
-            }
-        }
-    }
-
-    private class IpRangeReturnRunnable implements Runnable {
-        String ipRange;
-
-        public IpRangeReturnRunnable(String ipRange) {
-            this.ipRange = ipRange;
-        }
-
-        public void run() {
-            globIpRange = ipRange;
-            if (infoView != null) {
-                String text = infoView.getText().toString();
-                text += "\n" + globIpRange;
-                infoView.setText(text);
-                reportButton.setEnabled(true);
-            }
-        }
-    }
 }

app/src/main/java/org/schabi/newpipe/settings/ContentSettingsFragment.java

@@ -5,11 +5,16 @@ import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.v7.preference.ListPreference;
 import android.support.v7.preference.Preference;
 import android.util.Log;
 import android.widget.Toast;
 
+import com.nononsenseapps.filepicker.Utils;
+import com.nostra13.universalimageloader.core.ImageLoader;
+
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.StreamingService;
@@ -34,8 +39,6 @@ import java.util.zip.ZipFile;
 import java.util.zip.ZipInputStream;
 import java.util.zip.ZipOutputStream;
 
-import javax.annotation.Nonnull;
-
 public class ContentSettingsFragment extends BasePreferenceFragment {
 
     private static final int REQUEST_IMPORT_PATH = 8945;
@@ -46,6 +49,29 @@ public class ContentSettingsFragment extends BasePreferenceFragment {
     private File newpipe_db;
     private File newpipe_db_journal;
 
+    private String thumbnailLoadToggleKey;
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        thumbnailLoadToggleKey = getString(R.string.download_thumbnail_key);
+    }
+
+    @Override
+    public boolean onPreferenceTreeClick(Preference preference) {
+        if (preference.getKey().equals(thumbnailLoadToggleKey)) {
+            final ImageLoader imageLoader = ImageLoader.getInstance();
+            imageLoader.stop();
+            imageLoader.clearDiskCache();
+            imageLoader.clearMemoryCache();
+            imageLoader.resume();
+            Toast.makeText(preference.getContext(), R.string.thumbnail_cache_wipe_complete_notice,
+                    Toast.LENGTH_SHORT).show();
+        }
+
+        return super.onPreferenceTreeClick(preference);
+    }
+
     @Override
     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
 
@@ -140,15 +166,15 @@ public class ContentSettingsFragment extends BasePreferenceFragment {
     }
 
     @Override
-    public void onActivityResult(int requestCode, int resultCode, @Nonnull Intent data) {
+    public void onActivityResult(int requestCode, int resultCode, @NonNull Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
         if (DEBUG) {
             Log.d(TAG, "onActivityResult() called with: requestCode = [" + requestCode + "], resultCode = [" + resultCode + "], data = [" + data + "]");
         }
 
         if ((requestCode == REQUEST_IMPORT_PATH || requestCode == REQUEST_EXPORT_PATH)
-                && resultCode == Activity.RESULT_OK) {
-                String path = data.getData().getPath();
+                && resultCode == Activity.RESULT_OK && data.getData() != null) {
+                String path = Utils.getFileForUri(data.getData()).getAbsolutePath();
                 if (requestCode == REQUEST_EXPORT_PATH) {
                     SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US);
                     exportDatabase(path + "/NewPipeData-" + sdf.format(new Date()) + ".zip");

app/src/main/java/org/schabi/newpipe/settings/DownloadSettingsFragment.java

@@ -7,6 +7,8 @@ import android.support.annotation.Nullable;
 import android.support.v7.preference.Preference;
 import android.util.Log;
 
+import com.nononsenseapps.filepicker.Utils;
+
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
 
@@ -69,9 +71,11 @@ public class DownloadSettingsFragment extends BasePreferenceFragment {
             Log.d(TAG, "onActivityResult() called with: requestCode = [" + requestCode + "], resultCode = [" + resultCode + "], data = [" + data + "]");
         }
 
-        if ((requestCode == REQUEST_DOWNLOAD_PATH || requestCode == REQUEST_DOWNLOAD_AUDIO_PATH) && resultCode == Activity.RESULT_OK) {
+        if ((requestCode == REQUEST_DOWNLOAD_PATH || requestCode == REQUEST_DOWNLOAD_AUDIO_PATH)
+                && resultCode == Activity.RESULT_OK && data.getData() != null) {
             String key = getString(requestCode == REQUEST_DOWNLOAD_PATH ? R.string.download_path_key : R.string.download_path_audio_key);
-            String path = data.getData().getPath();
+            String path = Utils.getFileForUri(data.getData()).getAbsolutePath();
+
             defaultPreferences.edit().putString(key, path).apply();
             updatePreferencesSummary();
         }

app/src/main/java/org/schabi/newpipe/settings/HistorySettingsFragment.java

@@ -1,12 +1,35 @@
 package org.schabi.newpipe.settings;
 
 import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.v7.preference.Preference;
+import android.widget.Toast;
 
 import org.schabi.newpipe.R;
+import org.schabi.newpipe.util.InfoCache;
 
 public class HistorySettingsFragment extends BasePreferenceFragment {
+    private String cacheWipeKey;
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        cacheWipeKey = getString(R.string.metadata_cache_wipe_key);
+    }
+
     @Override
     public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
         addPreferencesFromResource(R.xml.history_settings);
     }
+
+    @Override
+    public boolean onPreferenceTreeClick(Preference preference) {
+        if (preference.getKey().equals(cacheWipeKey)) {
+            InfoCache.getInstance().clearCache();
+            Toast.makeText(preference.getContext(), R.string.metadata_cache_wipe_complete_notice,
+                    Toast.LENGTH_SHORT).show();
+        }
+
+        return super.onPreferenceTreeClick(preference);
+    }
 }

app/src/main/java/org/schabi/newpipe/settings/SelectChannelFragment.java

@@ -3,10 +3,10 @@ package org.schabi.newpipe.settings;
 import android.app.Activity;
 import android.content.DialogInterface;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.v4.app.DialogFragment;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -18,9 +18,9 @@ import com.nostra13.universalimageloader.core.ImageLoader;
 
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.subscription.SubscriptionEntity;
-import org.schabi.newpipe.fragments.subscription.SubscriptionService;
 import org.schabi.newpipe.report.ErrorActivity;
 import org.schabi.newpipe.report.UserAction;
+import org.schabi.newpipe.subscription.SubscriptionService;
 
 import java.util.List;
 import java.util.Vector;
@@ -87,7 +87,7 @@ public class SelectChannelFragment extends DialogFragment {
 
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View v = inflater.inflate(R.layout.select_channel_fragment, container, false);
         recyclerView = (RecyclerView) v.findViewById(R.id.items_list);
         recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
@@ -101,7 +101,7 @@ public class SelectChannelFragment extends DialogFragment {
         emptyView.setVisibility(View.GONE);
 
 
-        subscriptionService = SubscriptionService.getInstance();
+        subscriptionService = SubscriptionService.getInstance(getContext());
         subscriptionService.getSubscription().toObservable()
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())

app/src/main/java/org/schabi/newpipe/subscription/ImportExportEventListener.java

@@ -0,0 +1,17 @@
+package org.schabi.newpipe.subscription;
+
+public interface ImportExportEventListener {
+    /**
+     * Called when the size has been resolved.
+     *
+     * @param size how many items there are to import/export
+     */
+    void onSizeReceived(int size);
+
+    /**
+     * Called everytime an item has been parsed/resolved.
+     *
+     * @param itemName the name of the subscription item
+     */
+    void onItemCompleted(String itemName);
+}

app/src/main/java/org/schabi/newpipe/subscription/ImportExportJsonHelper.java

@@ -0,0 +1,138 @@
+/*
+ * Copyright 2018 Mauricio Colli <mauriciocolli@outlook.com>
+ * ImportExportJsonHelper.java is part of NewPipe
+ *
+ * License: GPL-3.0+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.schabi.newpipe.subscription;
+
+import android.support.annotation.Nullable;
+
+import com.grack.nanojson.JsonAppendableWriter;
+import com.grack.nanojson.JsonArray;
+import com.grack.nanojson.JsonObject;
+import com.grack.nanojson.JsonParser;
+import com.grack.nanojson.JsonSink;
+import com.grack.nanojson.JsonWriter;
+
+import org.schabi.newpipe.BuildConfig;
+import org.schabi.newpipe.extractor.subscription.SubscriptionExtractor.InvalidSourceException;
+import org.schabi.newpipe.extractor.subscription.SubscriptionItem;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A JSON implementation capable of importing and exporting subscriptions, it has the advantage
+ * of being able to transfer subscriptions to any device.
+ */
+public class ImportExportJsonHelper {
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Json implementation
+    //////////////////////////////////////////////////////////////////////////*/
+
+    private static final String JSON_APP_VERSION_KEY = "app_version";
+    private static final String JSON_APP_VERSION_INT_KEY = "app_version_int";
+
+    private static final String JSON_SUBSCRIPTIONS_ARRAY_KEY = "subscriptions";
+
+    private static final String JSON_SERVICE_ID_KEY = "service_id";
+    private static final String JSON_URL_KEY = "url";
+    private static final String JSON_NAME_KEY = "name";
+
+    /**
+     * Read a JSON source through the input stream and return the parsed subscription items.
+     *
+     * @param in            the input stream (e.g. a file)
+     * @param eventListener listener for the events generated
+     */
+    public static List<SubscriptionItem> readFrom(InputStream in, @Nullable ImportExportEventListener eventListener) throws InvalidSourceException {
+        if (in == null) throw new InvalidSourceException("input is null");
+
+        final List<SubscriptionItem> channels = new ArrayList<>();
+
+        try {
+            JsonObject parentObject = JsonParser.object().from(in);
+            JsonArray channelsArray = parentObject.getArray(JSON_SUBSCRIPTIONS_ARRAY_KEY);
+            if (eventListener != null) eventListener.onSizeReceived(channelsArray.size());
+
+            if (channelsArray == null) {
+                throw new InvalidSourceException("Channels array is null");
+            }
+
+            for (Object o : channelsArray) {
+                if (o instanceof JsonObject) {
+                    JsonObject itemObject = (JsonObject) o;
+                    int serviceId = itemObject.getInt(JSON_SERVICE_ID_KEY, 0);
+                    String url = itemObject.getString(JSON_URL_KEY);
+                    String name = itemObject.getString(JSON_NAME_KEY);
+
+                    if (url != null && name != null && !url.isEmpty() && !name.isEmpty()) {
+                        channels.add(new SubscriptionItem(serviceId, url, name));
+                        if (eventListener != null) eventListener.onItemCompleted(name);
+                    }
+                }
+            }
+        } catch (Throwable e) {
+            throw new InvalidSourceException("Couldn't parse json", e);
+        }
+
+        return channels;
+    }
+
+    /**
+     * Write the subscriptions items list as JSON to the output.
+     *
+     * @param items         the list of subscriptions items
+     * @param out           the output stream (e.g. a file)
+     * @param eventListener listener for the events generated
+     */
+    public static void writeTo(List<SubscriptionItem> items, OutputStream out, @Nullable ImportExportEventListener eventListener) {
+        JsonAppendableWriter writer = JsonWriter.on(out);
+        writeTo(items, writer, eventListener);
+        writer.done();
+    }
+
+    /**
+     * @see #writeTo(List, OutputStream, ImportExportEventListener)
+     */
+    public static void writeTo(List<SubscriptionItem> items, JsonSink writer, @Nullable ImportExportEventListener eventListener) {
+        if (eventListener != null) eventListener.onSizeReceived(items.size());
+
+        writer.object();
+
+        writer.value(JSON_APP_VERSION_KEY, BuildConfig.VERSION_NAME);
+        writer.value(JSON_APP_VERSION_INT_KEY, BuildConfig.VERSION_CODE);
+
+        writer.array(JSON_SUBSCRIPTIONS_ARRAY_KEY);
+        for (SubscriptionItem item : items) {
+            writer.object();
+            writer.value(JSON_SERVICE_ID_KEY, item.getServiceId());
+            writer.value(JSON_URL_KEY, item.getUrl());
+            writer.value(JSON_NAME_KEY, item.getName());
+            writer.end();
+
+            if (eventListener != null) eventListener.onItemCompleted(item.getName());
+        }
+        writer.end();
+
+        writer.end();
+    }
+
+}

app/src/main/java/org/schabi/newpipe/subscription/SubscriptionService.java

@@ -1,5 +1,7 @@
-package org.schabi.newpipe.fragments.subscription;
+package org.schabi.newpipe.subscription;
 
+import android.content.Context;
+import android.support.annotation.NonNull;
 import android.util.Log;
 
 import org.schabi.newpipe.MainActivity;
@@ -10,6 +12,7 @@ import org.schabi.newpipe.database.subscription.SubscriptionEntity;
 import org.schabi.newpipe.extractor.channel.ChannelInfo;
 import org.schabi.newpipe.util.ExtractorHelper;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
@@ -20,7 +23,6 @@ import io.reactivex.CompletableSource;
 import io.reactivex.Flowable;
 import io.reactivex.Maybe;
 import io.reactivex.Scheduler;
-import io.reactivex.annotations.NonNull;
 import io.reactivex.functions.Function;
 import io.reactivex.schedulers.Schedulers;
 
@@ -32,10 +34,20 @@ import io.reactivex.schedulers.Schedulers;
  */
 public class SubscriptionService {
 
-    private static final SubscriptionService sInstance = new SubscriptionService();
+    private static volatile SubscriptionService instance;
 
-    public static SubscriptionService getInstance() {
-        return sInstance;
+    public static SubscriptionService getInstance(@NonNull Context context) {
+        SubscriptionService result = instance;
+        if (result == null) {
+            synchronized (SubscriptionService.class) {
+                result = instance;
+                if (result == null) {
+                    instance = (result = new SubscriptionService(context));
+                }
+            }
+        }
+
+        return result;
     }
 
     protected final String TAG = "SubscriptionService@" + Integer.toHexString(hashCode());
@@ -48,8 +60,8 @@ public class SubscriptionService {
 
     private Scheduler subscriptionScheduler;
 
-    private SubscriptionService() {
-        db = NewPipeDatabase.getInstance();
+    private SubscriptionService(Context context) {
+        db = NewPipeDatabase.getInstance(context.getApplicationContext());
         subscription = getSubscriptionInfos();
 
         final Executor subscriptionExecutor = Executors.newFixedThreadPool(SUBSCRIPTION_THREAD_POOL_SIZE);
@@ -114,7 +126,7 @@ public class SubscriptionService {
                     if (!isSubscriptionUpToDate(info, subscription)) {
                         subscription.setData(info.getName(), info.getAvatarUrl(), info.getDescription(), info.getSubscriberCount());
 
-                        return update(subscription);
+                        return Completable.fromRunnable(() -> subscriptionTable().update(subscription));
                     }
                 }
 
@@ -127,13 +139,11 @@ public class SubscriptionService {
                 .flatMapCompletable(update);
     }
 
-    private Completable update(final SubscriptionEntity updatedSubscription) {
-        return Completable.fromRunnable(new Runnable() {
-            @Override
-            public void run() {
-                subscriptionTable().update(updatedSubscription);
-            }
-        });
+    public List<SubscriptionEntity> upsertAll(final List<ChannelInfo> infoList) {
+        final List<SubscriptionEntity> entityList = new ArrayList<>();
+        for (ChannelInfo info : infoList) entityList.add(SubscriptionEntity.from(info));
+
+        return subscriptionTable().upsertAll(entityList);
     }
 
     private boolean isSubscriptionUpToDate(final ChannelInfo info, final SubscriptionEntity entity) {

app/src/main/java/org/schabi/newpipe/subscription/services/BaseImportExportService.java

@@ -0,0 +1,227 @@
+/*
+ * Copyright 2018 Mauricio Colli <mauriciocolli@outlook.com>
+ * BaseImportExportService.java is part of NewPipe
+ *
+ * License: GPL-3.0+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.schabi.newpipe.subscription.services;
+
+import android.app.Service;
+import android.content.Intent;
+import android.os.Build;
+import android.os.IBinder;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.annotation.StringRes;
+import android.support.v4.app.NotificationCompat;
+import android.support.v4.app.NotificationManagerCompat;
+import android.text.TextUtils;
+import android.widget.Toast;
+
+import org.reactivestreams.Publisher;
+import org.schabi.newpipe.R;
+import org.schabi.newpipe.extractor.subscription.SubscriptionExtractor;
+import org.schabi.newpipe.report.ErrorActivity;
+import org.schabi.newpipe.report.UserAction;
+import org.schabi.newpipe.subscription.ImportExportEventListener;
+import org.schabi.newpipe.subscription.SubscriptionService;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import io.reactivex.Flowable;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.CompositeDisposable;
+import io.reactivex.functions.Function;
+import io.reactivex.processors.PublishProcessor;
+
+public abstract class BaseImportExportService extends Service {
+    protected final String TAG = this.getClass().getSimpleName();
+
+    protected NotificationManagerCompat notificationManager;
+    protected NotificationCompat.Builder notificationBuilder;
+
+    protected SubscriptionService subscriptionService;
+    protected CompositeDisposable disposables = new CompositeDisposable();
+    protected PublishProcessor<String> notificationUpdater = PublishProcessor.create();
+
+    @Nullable
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        subscriptionService = SubscriptionService.getInstance(this);
+        setupNotification();
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        disposeAll();
+    }
+
+    protected void disposeAll() {
+        disposables.clear();
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Notification Impl
+    //////////////////////////////////////////////////////////////////////////*/
+
+    private static final int NOTIFICATION_SAMPLING_PERIOD = 2500;
+
+    protected AtomicInteger currentProgress = new AtomicInteger(-1);
+    protected AtomicInteger maxProgress = new AtomicInteger(-1);
+    protected ImportExportEventListener eventListener = new ImportExportEventListener() {
+        @Override
+        public void onSizeReceived(int size) {
+            maxProgress.set(size);
+            currentProgress.set(0);
+        }
+
+        @Override
+        public void onItemCompleted(String itemName) {
+            currentProgress.incrementAndGet();
+            notificationUpdater.onNext(itemName);
+        }
+    };
+
+    protected abstract int getNotificationId();
+    @StringRes
+    public abstract int getTitle();
+
+    protected void setupNotification() {
+        notificationManager = NotificationManagerCompat.from(this);
+        notificationBuilder = createNotification();
+        startForeground(getNotificationId(), notificationBuilder.build());
+
+        final Function<Flowable<String>, Publisher<String>> throttleAfterFirstEmission = flow -> flow.limit(1)
+                .concatWith(flow.skip(1).throttleLast(NOTIFICATION_SAMPLING_PERIOD, TimeUnit.MILLISECONDS));
+
+        disposables.add(notificationUpdater
+                .filter(s -> !s.isEmpty())
+                .publish(throttleAfterFirstEmission)
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(this::updateNotification));
+    }
+
+    protected void updateNotification(String text) {
+        notificationBuilder.setProgress(maxProgress.get(), currentProgress.get(), maxProgress.get() == -1);
+
+        final String progressText = currentProgress + "/" + maxProgress;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            if (!TextUtils.isEmpty(text)) text = text + "  (" + progressText + ")";
+        } else {
+            notificationBuilder.setContentInfo(progressText);
+        }
+
+        if (!TextUtils.isEmpty(text)) notificationBuilder.setContentText(text);
+        notificationManager.notify(getNotificationId(), notificationBuilder.build());
+    }
+
+    protected void stopService() {
+        postErrorResult(null, null);
+    }
+
+    protected void stopAndReportError(@Nullable Throwable error, String request) {
+        stopService();
+
+        final ErrorActivity.ErrorInfo errorInfo = ErrorActivity.ErrorInfo.make(UserAction.SUBSCRIPTION, "unknown",
+                request, R.string.general_error);
+        ErrorActivity.reportError(this, error != null ? Collections.singletonList(error) : Collections.emptyList(),
+                null, null, errorInfo);
+    }
+
+    protected void postErrorResult(String title, String text) {
+        disposeAll();
+        stopForeground(true);
+        stopSelf();
+
+        if (title == null) {
+            return;
+        }
+
+        text = text == null ? "" : text;
+        notificationBuilder = new NotificationCompat.Builder(this, getString(R.string.notification_channel_id))
+                .setSmallIcon(R.drawable.ic_newpipe_triangle_white)
+                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
+                .setContentTitle(title)
+                .setStyle(new NotificationCompat.BigTextStyle().bigText(text))
+                .setContentText(text);
+        notificationManager.notify(getNotificationId(), notificationBuilder.build());
+    }
+
+    protected NotificationCompat.Builder createNotification() {
+        return new NotificationCompat.Builder(this, getString(R.string.notification_channel_id))
+                .setOngoing(true)
+                .setProgress(-1, -1, true)
+                .setSmallIcon(R.drawable.ic_newpipe_triangle_white)
+                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
+                .setContentTitle(getString(getTitle()));
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Toast
+    //////////////////////////////////////////////////////////////////////////*/
+
+    protected Toast toast;
+
+    protected void showToast(@StringRes int message) {
+        showToast(getString(message), Toast.LENGTH_SHORT);
+    }
+
+    protected void showToast(String message, int duration) {
+        if (toast != null) toast.cancel();
+
+        toast = Toast.makeText(this, message, duration);
+        toast.show();
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Error handling
+    //////////////////////////////////////////////////////////////////////////*/
+
+    protected void handleError(@StringRes int errorTitle, @NonNull Throwable error) {
+        String message = getErrorMessage(error);
+
+        if (TextUtils.isEmpty(message)) {
+            final String errorClassName = error.getClass().getName();
+            message = getString(R.string.error_occurred_detail, errorClassName);
+        }
+
+        showToast(errorTitle);
+        postErrorResult(getString(errorTitle), message);
+    }
+
+    protected String getErrorMessage(Throwable error) {
+        String message = null;
+        if (error instanceof SubscriptionExtractor.InvalidSourceException) {
+            message = getString(R.string.invalid_source);
+        } else if (error instanceof FileNotFoundException) {
+            message = getString(R.string.invalid_file);
+        } else if (error instanceof IOException) {
+            message = getString(R.string.network_error);
+        }
+        return message;
+    }
+}

app/src/main/java/org/schabi/newpipe/subscription/services/SubscriptionsExportService.java

@@ -0,0 +1,153 @@
+/*
+ * Copyright 2018 Mauricio Colli <mauriciocolli@outlook.com>
+ * SubscriptionsExportService.java is part of NewPipe
+ *
+ * License: GPL-3.0+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.schabi.newpipe.subscription.services;
+
+import android.content.Intent;
+import android.support.v4.content.LocalBroadcastManager;
+import android.text.TextUtils;
+import android.util.Log;
+
+import org.reactivestreams.Subscriber;
+import org.reactivestreams.Subscription;
+import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.subscription.SubscriptionEntity;
+import org.schabi.newpipe.extractor.subscription.SubscriptionItem;
+import org.schabi.newpipe.subscription.ImportExportJsonHelper;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.functions.Function;
+import io.reactivex.schedulers.Schedulers;
+
+import static org.schabi.newpipe.MainActivity.DEBUG;
+
+public class SubscriptionsExportService extends BaseImportExportService {
+    public static final String KEY_FILE_PATH = "key_file_path";
+
+    /**
+     * A {@link LocalBroadcastManager local broadcast} will be made with this action when the export is successfully completed.
+     */
+    public static final String EXPORT_COMPLETE_ACTION = "org.schabi.newpipe.subscription.services.SubscriptionsExportService.EXPORT_COMPLETE";
+
+    private Subscription subscription;
+    private File outFile;
+    private FileOutputStream outputStream;
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        if (intent == null || subscription != null) return START_NOT_STICKY;
+
+        final String path = intent.getStringExtra(KEY_FILE_PATH);
+        if (TextUtils.isEmpty(path)) {
+            stopAndReportError(new IllegalStateException("Exporting to a file, but the path is empty or null"), "Exporting subscriptions");
+            return START_NOT_STICKY;
+        }
+
+        try {
+            outputStream = new FileOutputStream(outFile = new File(path));
+        } catch (FileNotFoundException e) {
+            handleError(e);
+            return START_NOT_STICKY;
+        }
+
+        startExport();
+
+        return START_NOT_STICKY;
+    }
+
+    @Override
+    protected int getNotificationId() {
+        return 4567;
+    }
+
+    @Override
+    public int getTitle() {
+        return R.string.export_ongoing;
+    }
+
+    @Override
+    protected void disposeAll() {
+        super.disposeAll();
+        if (subscription != null) subscription.cancel();
+    }
+
+    private void startExport() {
+        showToast(R.string.export_ongoing);
+
+        subscriptionService.subscriptionTable()
+                .getAll()
+                .take(1)
+                .map(subscriptionEntities -> {
+                    final List<SubscriptionItem> result = new ArrayList<>(subscriptionEntities.size());
+                    for (SubscriptionEntity entity : subscriptionEntities) {
+                        result.add(new SubscriptionItem(entity.getServiceId(), entity.getUrl(), entity.getName()));
+                    }
+                    return result;
+                })
+                .map(exportToFile())
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(getSubscriber());
+    }
+
+    private Subscriber<File> getSubscriber() {
+        return new Subscriber<File>() {
+            @Override
+            public void onSubscribe(Subscription s) {
+                subscription = s;
+                s.request(1);
+            }
+
+            @Override
+            public void onNext(File file) {
+                if (DEBUG) Log.d(TAG, "startExport() success: file = " + file);
+            }
+
+            @Override
+            public void onError(Throwable error) {
+                Log.e(TAG, "onError() called with: error = [" + error + "]", error);
+                handleError(error);
+            }
+
+            @Override
+            public void onComplete() {
+                LocalBroadcastManager.getInstance(SubscriptionsExportService.this).sendBroadcast(new Intent(EXPORT_COMPLETE_ACTION));
+                showToast(R.string.export_complete_toast);
+                stopService();
+            }
+        };
+    }
+
+    private Function<List<SubscriptionItem>, File> exportToFile() {
+        return subscriptionItems -> {
+            ImportExportJsonHelper.writeTo(subscriptionItems, outputStream, eventListener);
+            return outFile;
+        };
+    }
+
+    protected void handleError(Throwable error) {
+        super.handleError(R.string.subscriptions_export_unsuccessful, error);
+    }
+}

app/src/main/java/org/schabi/newpipe/subscription/services/SubscriptionsImportService.java

@@ -0,0 +1,264 @@
+/*
+ * Copyright 2018 Mauricio Colli <mauriciocolli@outlook.com>
+ * SubscriptionsImportService.java is part of NewPipe
+ *
+ * License: GPL-3.0+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.schabi.newpipe.subscription.services;
+
+import android.content.Intent;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.content.LocalBroadcastManager;
+import android.text.TextUtils;
+import android.util.Log;
+
+import org.reactivestreams.Subscriber;
+import org.reactivestreams.Subscription;
+import org.schabi.newpipe.R;
+import org.schabi.newpipe.database.subscription.SubscriptionEntity;
+import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.channel.ChannelInfo;
+import org.schabi.newpipe.extractor.subscription.SubscriptionItem;
+import org.schabi.newpipe.subscription.ImportExportJsonHelper;
+import org.schabi.newpipe.util.Constants;
+import org.schabi.newpipe.util.ExtractorHelper;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+import io.reactivex.Flowable;
+import io.reactivex.Notification;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.functions.Consumer;
+import io.reactivex.functions.Function;
+import io.reactivex.schedulers.Schedulers;
+
+import static org.schabi.newpipe.MainActivity.DEBUG;
+
+public class SubscriptionsImportService extends BaseImportExportService {
+    public static final int CHANNEL_URL_MODE = 0;
+    public static final int INPUT_STREAM_MODE = 1;
+    public static final int PREVIOUS_EXPORT_MODE = 2;
+    public static final String KEY_MODE = "key_mode";
+    public static final String KEY_VALUE = "key_value";
+
+    /**
+     * A {@link LocalBroadcastManager local broadcast} will be made with this action when the import is successfully completed.
+     */
+    public static final String IMPORT_COMPLETE_ACTION = "org.schabi.newpipe.subscription.services.SubscriptionsImportService.IMPORT_COMPLETE";
+
+    private Subscription subscription;
+    private int currentMode;
+    private int currentServiceId;
+
+    @Nullable
+    private String channelUrl;
+    @Nullable
+    private InputStream inputStream;
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        if (intent == null || subscription != null) return START_NOT_STICKY;
+
+        currentMode = intent.getIntExtra(KEY_MODE, -1);
+        currentServiceId = intent.getIntExtra(Constants.KEY_SERVICE_ID, Constants.NO_SERVICE_ID);
+
+        if (currentMode == CHANNEL_URL_MODE) {
+            channelUrl = intent.getStringExtra(KEY_VALUE);
+        } else {
+            final String filePath = intent.getStringExtra(KEY_VALUE);
+            if (TextUtils.isEmpty(filePath)) {
+                stopAndReportError(new IllegalStateException("Importing from input stream, but file path is empty or null"), "Importing subscriptions");
+                return START_NOT_STICKY;
+            }
+
+            try {
+                inputStream = new FileInputStream(new File(filePath));
+            } catch (FileNotFoundException e) {
+                handleError(e);
+                return START_NOT_STICKY;
+            }
+        }
+
+        if (currentMode == -1 || currentMode == CHANNEL_URL_MODE && channelUrl == null) {
+            final String errorDescription = "Some important field is null or in illegal state: currentMode=[" + currentMode + "], channelUrl=[" + channelUrl + "], inputStream=[" + inputStream + "]";
+            stopAndReportError(new IllegalStateException(errorDescription), "Importing subscriptions");
+            return START_NOT_STICKY;
+        }
+
+        startImport();
+        return START_NOT_STICKY;
+    }
+
+    @Override
+    protected int getNotificationId() {
+        return 4568;
+    }
+
+    @Override
+    public int getTitle() {
+        return R.string.import_ongoing;
+    }
+
+    @Override
+    protected void disposeAll() {
+        super.disposeAll();
+        if (subscription != null) subscription.cancel();
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Imports
+    //////////////////////////////////////////////////////////////////////////*/
+
+    /**
+     * How many extractions running in parallel.
+     */
+    public static final int PARALLEL_EXTRACTIONS = 8;
+
+    /**
+     * Number of items to buffer to mass-insert in the subscriptions table, this leads to
+     * a better performance as we can then use db transactions.
+     */
+    public static final int BUFFER_COUNT_BEFORE_INSERT = 50;
+
+    private void startImport() {
+        showToast(R.string.import_ongoing);
+
+        Flowable<List<SubscriptionItem>> flowable = null;
+        if (currentMode == CHANNEL_URL_MODE) {
+            flowable = importFromChannelUrl();
+        } else if (currentMode == INPUT_STREAM_MODE) {
+            flowable = importFromInputStream();
+        } else if (currentMode == PREVIOUS_EXPORT_MODE) {
+            flowable = importFromPreviousExport();
+        }
+
+        if (flowable == null) {
+            final String message = "Flowable given by \"importFrom\" is null (current mode: " + currentMode + ")";
+            stopAndReportError(new IllegalStateException(message), "Importing subscriptions");
+            return;
+        }
+
+        flowable.doOnNext(subscriptionItems -> eventListener.onSizeReceived(subscriptionItems.size()))
+                .flatMap(Flowable::fromIterable)
+
+                .parallel(PARALLEL_EXTRACTIONS)
+                .runOn(Schedulers.io())
+                .map((Function<SubscriptionItem, Notification<ChannelInfo>>) subscriptionItem -> {
+                    try {
+                        return Notification.createOnNext(ExtractorHelper
+                                .getChannelInfo(subscriptionItem.getServiceId(), subscriptionItem.getUrl(), true)
+                                .blockingGet());
+                    } catch (Throwable e) {
+                        return Notification.createOnError(e);
+                    }
+                })
+                .sequential()
+
+                .observeOn(Schedulers.io())
+                .doOnNext(getNotificationsConsumer())
+                .buffer(BUFFER_COUNT_BEFORE_INSERT)
+                .map(upsertBatch())
+
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(getSubscriber());
+    }
+
+    private Subscriber<List<SubscriptionEntity>> getSubscriber() {
+        return new Subscriber<List<SubscriptionEntity>>() {
+
+            @Override
+            public void onSubscribe(Subscription s) {
+                subscription = s;
+                s.request(Long.MAX_VALUE);
+            }
+
+            @Override
+            public void onNext(List<SubscriptionEntity> successfulInserted) {
+                if (DEBUG) Log.d(TAG, "startImport() " + successfulInserted.size() + " items successfully inserted into the database");
+            }
+
+            @Override
+            public void onError(Throwable error) {
+                handleError(error);
+            }
+
+            @Override
+            public void onComplete() {
+                LocalBroadcastManager.getInstance(SubscriptionsImportService.this).sendBroadcast(new Intent(IMPORT_COMPLETE_ACTION));
+                showToast(R.string.import_complete_toast);
+                stopService();
+            }
+        };
+    }
+
+    private Consumer<Notification<ChannelInfo>> getNotificationsConsumer() {
+        return notification -> {
+            if (notification.isOnNext()) {
+                String name = notification.getValue().getName();
+                eventListener.onItemCompleted(!TextUtils.isEmpty(name) ? name : "");
+            } else if (notification.isOnError()) {
+                final Throwable error = notification.getError();
+                final Throwable cause = error.getCause();
+                if (error instanceof IOException) {
+                    throw (IOException) error;
+                } else if (cause != null && cause instanceof IOException) {
+                    throw (IOException) cause;
+                }
+
+                eventListener.onItemCompleted("");
+            }
+        };
+    }
+
+    private Function<List<Notification<ChannelInfo>>, List<SubscriptionEntity>> upsertBatch() {
+        return notificationList -> {
+            final List<ChannelInfo> infoList = new ArrayList<>(notificationList.size());
+            for (Notification<ChannelInfo> n : notificationList) {
+                if (n.isOnNext()) infoList.add(n.getValue());
+            }
+
+            return subscriptionService.upsertAll(infoList);
+        };
+    }
+
+    private Flowable<List<SubscriptionItem>> importFromChannelUrl() {
+        return Flowable.fromCallable(() -> NewPipe.getService(currentServiceId)
+                .getSubscriptionExtractor()
+                .fromChannelUrl(channelUrl));
+    }
+
+    private Flowable<List<SubscriptionItem>> importFromInputStream() {
+        return Flowable.fromCallable(() -> NewPipe.getService(currentServiceId)
+                .getSubscriptionExtractor()
+                .fromInputStream(inputStream));
+    }
+
+    private Flowable<List<SubscriptionItem>> importFromPreviousExport() {
+        return Flowable.fromCallable(() -> ImportExportJsonHelper.readFrom(inputStream, null));
+    }
+
+    protected void handleError(@NonNull Throwable error) {
+        super.handleError(R.string.subscriptions_import_unsuccessful, error);
+    }
+}

app/src/main/java/org/schabi/newpipe/util/AnimationUtils.java

@@ -1,3 +1,22 @@
+/*
+ * Copyright 2018 Mauricio Colli <mauriciocolli@outlook.com>
+ * AnimationUtils.java is part of NewPipe
+ *
+ * License: GPL-3.0+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
 package org.schabi.newpipe.util;
 
 import android.animation.Animator;
@@ -19,7 +38,9 @@ public class AnimationUtils {
     private static final boolean DEBUG = MainActivity.DEBUG;
 
     public enum Type {
-        ALPHA, SCALE_AND_ALPHA, LIGHT_SCALE_AND_ALPHA, SLIDE_AND_ALPHA, LIGHT_SLIDE_AND_ALPHA
+        ALPHA,
+        SCALE_AND_ALPHA, LIGHT_SCALE_AND_ALPHA,
+        SLIDE_AND_ALPHA, LIGHT_SLIDE_AND_ALPHA
     }
 
     public static void animateView(View view, boolean enterOrExit, long duration) {
@@ -168,6 +189,58 @@ public class AnimationUtils {
         viewPropertyAnimator.start();
     }
 
+    public static ValueAnimator animateHeight(final View view, long duration, int targetHeight) {
+        final int height = view.getHeight();
+        if (DEBUG) {
+            Log.d(TAG, "animateHeight: duration = [" + duration + "], from " + height + " to → " + targetHeight + " in: " + view);
+        }
+
+        ValueAnimator animator = ValueAnimator.ofFloat(height, targetHeight);
+        animator.setInterpolator(new FastOutSlowInInterpolator());
+        animator.setDuration(duration);
+        animator.addUpdateListener(animation -> {
+            final float value = (float) animation.getAnimatedValue();
+            view.getLayoutParams().height = (int) value;
+            view.requestLayout();
+        });
+        animator.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                view.getLayoutParams().height = targetHeight;
+                view.requestLayout();
+            }
+
+            @Override
+            public void onAnimationCancel(Animator animation) {
+                view.getLayoutParams().height = targetHeight;
+                view.requestLayout();
+            }
+        });
+        animator.start();
+
+        return animator;
+    }
+
+    public static void animateRotation(final View view, long duration, int targetRotation) {
+        if (DEBUG) {
+            Log.d(TAG, "animateRotation: duration = [" + duration + "], from " + view.getRotation() + " to → " + targetRotation + " in: " + view);
+        }
+        view.animate().setListener(null).cancel();
+
+        view.animate().rotation(targetRotation).setDuration(duration).setInterpolator(new FastOutSlowInInterpolator())
+                .setListener(new AnimatorListenerAdapter() {
+                    @Override
+                    public void onAnimationCancel(Animator animation) {
+                        view.setRotation(targetRotation);
+                    }
+
+                    @Override
+                    public void onAnimationEnd(Animator animation) {
+                        view.setRotation(targetRotation);
+                    }
+                }).start();
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
     // Internals
     //////////////////////////////////////////////////////////////////////////*/

app/src/main/java/org/schabi/newpipe/util/ExtractorHelper.java

@@ -29,7 +29,7 @@ import org.schabi.newpipe.MainActivity;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.ReCaptchaActivity;
 import org.schabi.newpipe.extractor.Info;
-import org.schabi.newpipe.extractor.ListExtractor.NextItemsResult;
+import org.schabi.newpipe.extractor.ListExtractor.InfoItemsPage;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.channel.ChannelInfo;
 import org.schabi.newpipe.extractor.exceptions.ContentNotAvailableException;
@@ -78,7 +78,7 @@ public final class ExtractorHelper {
         );
     }
 
-    public static Single<NextItemsResult> getMoreSearchItems(final int serviceId,
+    public static Single<InfoItemsPage> getMoreSearchItems(final int serviceId,
                                                              final String query,
                                                              final int nextPageNumber,
                                                              final String searchLanguage,
@@ -86,7 +86,7 @@ public final class ExtractorHelper {
         checkServiceId(serviceId);
         return searchFor(serviceId, query, nextPageNumber, searchLanguage, filter)
                 .map((@NonNull SearchResult searchResult) ->
-                        new NextItemsResult(searchResult.resultList,
+                        new InfoItemsPage(searchResult.resultList,
                                 nextPageNumber + "",
                                 searchResult.errors));
     }
@@ -117,7 +117,7 @@ public final class ExtractorHelper {
                 ChannelInfo.getInfo(NewPipe.getService(serviceId), url)));
     }
 
-    public static Single<NextItemsResult> getMoreChannelItems(final int serviceId,
+    public static Single<InfoItemsPage> getMoreChannelItems(final int serviceId,
                                                               final String url,
                                                               final String nextStreamsUrl) {
         checkServiceId(serviceId);
@@ -133,7 +133,7 @@ public final class ExtractorHelper {
                 PlaylistInfo.getInfo(NewPipe.getService(serviceId), url)));
     }
 
-    public static Single<NextItemsResult> getMorePlaylistItems(final int serviceId,
+    public static Single<InfoItemsPage> getMorePlaylistItems(final int serviceId,
                                                                final String url,
                                                                final String nextStreamsUrl) {
         checkServiceId(serviceId);
@@ -149,7 +149,7 @@ public final class ExtractorHelper {
                 KioskInfo.getInfo(NewPipe.getService(serviceId), url, contentCountry)));
     }
 
-    public static Single<NextItemsResult> getMoreKioskItems(final int serviceId,
+    public static Single<InfoItemsPage> getMoreKioskItems(final int serviceId,
                                                             final String url,
                                                             final String nextStreamsUrl,
                                                             final String contentCountry) {
@@ -172,7 +172,7 @@ public final class ExtractorHelper {
                                                          String url,
                                                          Single<I> loadFromNetwork) {
         checkServiceId(serviceId);
-        loadFromNetwork = loadFromNetwork.doOnSuccess((@NonNull I i) -> cache.putInfo(i));
+        loadFromNetwork = loadFromNetwork.doOnSuccess(info -> cache.putInfo(serviceId, url, info));
 
         Single<I> load;
         if (forceLoad) {
@@ -224,8 +224,6 @@ public final class ExtractorHelper {
                 Toast.makeText(context, R.string.network_error, Toast.LENGTH_LONG).show();
             } else if (exception instanceof YoutubeStreamExtractor.GemaException) {
                 Toast.makeText(context, R.string.blocked_by_gema, Toast.LENGTH_LONG).show();
-            } else if (exception instanceof YoutubeStreamExtractor.LiveStreamException) {
-                Toast.makeText(context, R.string.live_streams_not_supported, Toast.LENGTH_LONG).show();
             } else if (exception instanceof ContentNotAvailableException) {
                 Toast.makeText(context, R.string.content_not_available, Toast.LENGTH_LONG).show();
             } else {

app/src/main/java/org/schabi/newpipe/util/FilePickerActivityHelper.java

@@ -1,10 +1,32 @@
 package org.schabi.newpipe.util;
 
+import android.content.Context;
+import android.content.Intent;
 import android.os.Bundle;
+import android.os.Environment;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.content.Loader;
+import android.support.v7.util.SortedList;
+import android.support.v7.widget.RecyclerView;
+import android.util.TypedValue;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.nononsenseapps.filepicker.AbstractFilePickerFragment;
+import com.nononsenseapps.filepicker.FilePickerFragment;
+
 import org.schabi.newpipe.R;
 
+import java.io.File;
+
 public class FilePickerActivityHelper extends com.nononsenseapps.filepicker.FilePickerActivity {
 
+    private CustomFilePickerFragment currentFragment;
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         if(ThemeHelper.isLightThemeSelected(this)) {
@@ -14,4 +36,98 @@ public class FilePickerActivityHelper extends com.nononsenseapps.filepicker.File
         }
         super.onCreate(savedInstanceState);
     }
+
+    @Override
+    public void onBackPressed() {
+        // If at top most level, normal behaviour
+        if (currentFragment.isBackTop()) {
+            super.onBackPressed();
+        } else {
+            // Else go up
+            currentFragment.goUp();
+        }
+    }
+
+    @Override
+    protected AbstractFilePickerFragment<File> getFragment(@Nullable String startPath, int mode, boolean allowMultiple, boolean allowCreateDir, boolean allowExistingFile, boolean singleClick) {
+        final CustomFilePickerFragment fragment = new CustomFilePickerFragment();
+        fragment.setArgs(startPath != null ? startPath : Environment.getExternalStorageDirectory().getPath(),
+                mode, allowMultiple, allowCreateDir, allowExistingFile, singleClick);
+        return currentFragment = fragment;
+    }
+
+    public static Intent chooseSingleFile(@NonNull Context context) {
+        return new Intent(context, FilePickerActivityHelper.class)
+                .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_MULTIPLE, false)
+                .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_CREATE_DIR, false)
+                .putExtra(FilePickerActivityHelper.EXTRA_SINGLE_CLICK, true)
+                .putExtra(FilePickerActivityHelper.EXTRA_MODE, FilePickerActivityHelper.MODE_FILE);
+    }
+
+    public static Intent chooseFileToSave(@NonNull Context context, @Nullable String startPath) {
+        return new Intent(context, FilePickerActivityHelper.class)
+                .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_MULTIPLE, false)
+                .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_CREATE_DIR, true)
+                .putExtra(FilePickerActivityHelper.EXTRA_ALLOW_EXISTING_FILE, true)
+                .putExtra(FilePickerActivityHelper.EXTRA_START_PATH, startPath)
+                .putExtra(FilePickerActivityHelper.EXTRA_MODE, FilePickerActivityHelper.MODE_NEW_FILE);
+    }
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // Internal
+    //////////////////////////////////////////////////////////////////////////*/
+
+    public static class CustomFilePickerFragment extends FilePickerFragment {
+
+        @Override
+        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+            return super.onCreateView(inflater, container, savedInstanceState);
+        }
+
+        @NonNull
+        @Override
+        public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+            final RecyclerView.ViewHolder viewHolder = super.onCreateViewHolder(parent, viewType);
+
+            final View view = viewHolder.itemView.findViewById(android.R.id.text1);
+            if (view instanceof TextView) {
+                ((TextView) view).setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources().getDimension(R.dimen.file_picker_items_text_size));
+            }
+
+            return viewHolder;
+        }
+
+        @Override
+        public void onClickOk(@NonNull View view) {
+            if (mode == MODE_NEW_FILE && getNewFileName().isEmpty()) {
+                if (mToast != null) mToast.cancel();
+                mToast = Toast.makeText(getActivity(), R.string.file_name_empty_error, Toast.LENGTH_SHORT);
+                mToast.show();
+                return;
+            }
+
+            super.onClickOk(view);
+        }
+
+        public File getBackTop() {
+            if (getArguments() == null) return Environment.getExternalStorageDirectory();
+
+            final String path = getArguments().getString(KEY_START_PATH, "/");
+            if (path.contains(Environment.getExternalStorageDirectory().getPath())) {
+                return Environment.getExternalStorageDirectory();
+            }
+
+            return getPath(path);
+        }
+
+        public boolean isBackTop() {
+            return compareFiles(mCurrentPath, getBackTop()) == 0 || compareFiles(mCurrentPath, new File("/")) == 0;
+        }
+
+        @Override
+        public void onLoadFinished(Loader<SortedList<File>> loader, SortedList<File> data) {
+            super.onLoadFinished(loader, data);
+            layoutManager.scrollToPosition(0);
+        }
+    }
 }

app/src/main/java/org/schabi/newpipe/util/ImageDisplayConstants.java

@@ -0,0 +1,58 @@
+package org.schabi.newpipe.util;
+
+import android.graphics.Bitmap;
+
+import com.nostra13.universalimageloader.core.DisplayImageOptions;
+import com.nostra13.universalimageloader.core.assist.ImageScaleType;
+import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
+
+import org.schabi.newpipe.R;
+
+public class ImageDisplayConstants {
+    private static final int BITMAP_FADE_IN_DURATION_MILLIS = 250;
+
+    /**
+     * Base display options
+     */
+    private static final DisplayImageOptions BASE_DISPLAY_IMAGE_OPTIONS =
+            new DisplayImageOptions.Builder()
+                    .cacheInMemory(true)
+                    .cacheOnDisk(true)
+                    .resetViewBeforeLoading(true)
+                    .bitmapConfig(Bitmap.Config.RGB_565)
+                    .imageScaleType(ImageScaleType.EXACTLY)
+                    .displayer(new FadeInBitmapDisplayer(BITMAP_FADE_IN_DURATION_MILLIS))
+                    .build();
+
+    /*//////////////////////////////////////////////////////////////////////////
+    // DisplayImageOptions default configurations
+    //////////////////////////////////////////////////////////////////////////*/
+
+    public static final DisplayImageOptions DISPLAY_AVATAR_OPTIONS =
+            new DisplayImageOptions.Builder()
+                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
+                    .showImageForEmptyUri(R.drawable.buddy)
+                    .showImageOnFail(R.drawable.buddy)
+                    .build();
+
+    public static final DisplayImageOptions DISPLAY_THUMBNAIL_OPTIONS =
+            new DisplayImageOptions.Builder()
+                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
+                    .showImageForEmptyUri(R.drawable.dummy_thumbnail)
+                    .showImageOnFail(R.drawable.dummy_thumbnail)
+                    .build();
+
+    public static final DisplayImageOptions DISPLAY_BANNER_OPTIONS =
+            new DisplayImageOptions.Builder()
+                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
+                    .showImageForEmptyUri(R.drawable.channel_banner)
+                    .showImageOnFail(R.drawable.channel_banner)
+                    .build();
+
+    public static final DisplayImageOptions DISPLAY_PLAYLIST_OPTIONS =
+            new DisplayImageOptions.Builder()
+                    .cloneFrom(BASE_DISPLAY_IMAGE_OPTIONS)
+                    .showImageForEmptyUri(R.drawable.dummy_thumbnail_playlist)
+                    .showImageOnFail(R.drawable.dummy_thumbnail_playlist)
+                    .build();
+}

app/src/main/java/org/schabi/newpipe/util/InfoCache.java

@@ -20,6 +20,7 @@
 package org.schabi.newpipe.util;
 
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.v4.util.LruCache;
 import android.util.Log;
 
@@ -29,6 +30,8 @@ import org.schabi.newpipe.extractor.Info;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
+import static org.schabi.newpipe.extractor.ServiceList.SoundCloud;
+
 
 public final class InfoCache {
     private static final boolean DEBUG = MainActivity.DEBUG;
@@ -40,7 +43,6 @@ public final class InfoCache {
      * Trim the cache to this size
      */
     private static final int TRIM_CACHE_TO = 30;
-    private static final int DEFAULT_TIMEOUT_HOURS = 4;
 
     private static final LruCache<String, CacheData> lruCache = new LruCache<>(MAX_ITEMS_ON_CACHE);
 
@@ -52,6 +54,7 @@ public final class InfoCache {
         return instance;
     }
 
+    @Nullable
     public Info getFromKey(int serviceId, @NonNull String url) {
         if (DEBUG) Log.d(TAG, "getFromKey() called with: serviceId = [" + serviceId + "], url = [" + url + "]");
         synchronized (lruCache) {
@@ -59,18 +62,13 @@ public final class InfoCache {
         }
     }
 
-    public void putInfo(@NonNull Info info) {
+    public void putInfo(int serviceId, @NonNull String url, @NonNull Info info) {
         if (DEBUG) Log.d(TAG, "putInfo() called with: info = [" + info + "]");
-        synchronized (lruCache) {
-            final CacheData data = new CacheData(info, DEFAULT_TIMEOUT_HOURS, TimeUnit.HOURS);
-            lruCache.put(keyOf(info), data);
-        }
-    }
 
-    public void removeInfo(@NonNull Info info) {
-        if (DEBUG) Log.d(TAG, "removeInfo() called with: info = [" + info + "]");
+        final long expirationMillis = ServiceHelper.getCacheExpirationMillis(info.getServiceId());
         synchronized (lruCache) {
-            lruCache.remove(keyOf(info));
+            final CacheData data = new CacheData(info, expirationMillis);
+            lruCache.put(keyOf(serviceId, url), data);
         }
     }
 
@@ -102,10 +100,7 @@ public final class InfoCache {
         }
     }
 
-    private static String keyOf(@NonNull final Info info) {
-        return keyOf(info.getServiceId(), info.getUrl());
-    }
-
+    @NonNull
     private static String keyOf(final int serviceId, @NonNull final String url) {
         return serviceId + url;
     }
@@ -119,6 +114,7 @@ public final class InfoCache {
         }
     }
 
+    @Nullable
     private static Info getInfo(@NonNull final LruCache<String, CacheData> cache,
                                 @NonNull final String key) {
         final CacheData data = cache.get(key);
@@ -136,12 +132,8 @@ public final class InfoCache {
         final private long expireTimestamp;
         final private Info info;
 
-        private CacheData(@NonNull final Info info,
-                          final long timeout,
-                          @NonNull final TimeUnit timeUnit) {
-            this.expireTimestamp = System.currentTimeMillis() +
-                    TimeUnit.MILLISECONDS.convert(timeout, timeUnit);
-
+        private CacheData(@NonNull final Info info, final long timeoutMillis) {
+            this.expireTimestamp = System.currentTimeMillis() + timeoutMillis;
             this.info = info;
         }
 

app/src/main/java/org/schabi/newpipe/util/NavigationHelper.java

@@ -1,5 +1,6 @@
 package org.schabi.newpipe.util;
 
+import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.ActivityNotFoundException;
 import android.content.Context;
@@ -7,8 +8,11 @@ import android.content.Intent;
 import android.net.Uri;
 import android.os.Build;
 import android.preference.PreferenceManager;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentTransaction;
 import android.support.v7.app.AlertDialog;
 import android.util.Log;
 import android.widget.Toast;
@@ -33,9 +37,10 @@ import org.schabi.newpipe.fragments.list.feed.FeedFragment;
 import org.schabi.newpipe.fragments.list.kiosk.KioskFragment;
 import org.schabi.newpipe.fragments.list.playlist.PlaylistFragment;
 import org.schabi.newpipe.fragments.list.search.SearchFragment;
+import org.schabi.newpipe.fragments.local.bookmark.LastPlayedFragment;
 import org.schabi.newpipe.fragments.local.bookmark.LocalPlaylistFragment;
 import org.schabi.newpipe.fragments.local.bookmark.MostPlayedFragment;
-import org.schabi.newpipe.fragments.local.bookmark.LastPlayedFragment;
+import org.schabi.newpipe.fragments.subscription.SubscriptionsImportFragment;
 import org.schabi.newpipe.history.HistoryActivity;
 import org.schabi.newpipe.player.BackgroundPlayer;
 import org.schabi.newpipe.player.BackgroundPlayerActivity;
@@ -59,39 +64,45 @@ public class NavigationHelper {
     // Players
     //////////////////////////////////////////////////////////////////////////*/
 
-    public static Intent getPlayerIntent(final Context context,
-                                         final Class targetClazz,
-                                         final PlayQueue playQueue,
-                                         final String quality) {
-        Intent intent = new Intent(context, targetClazz)
-                .putExtra(VideoPlayer.PLAY_QUEUE, playQueue);
+    @NonNull
+    public static Intent getPlayerIntent(@NonNull final Context context,
+                                         @NonNull final Class targetClazz,
+                                         @NonNull final PlayQueue playQueue,
+                                         @Nullable final String quality) {
+        Intent intent = new Intent(context, targetClazz);
+
+        final String cacheKey = SerializedCache.getInstance().put(playQueue, PlayQueue.class);
+        if (cacheKey != null) intent.putExtra(VideoPlayer.PLAY_QUEUE_KEY, cacheKey);
         if (quality != null) intent.putExtra(VideoPlayer.PLAYBACK_QUALITY, quality);
 
         return intent;
     }
 
-    public static Intent getPlayerIntent(final Context context,
-                                         final Class targetClazz,
-                                         final PlayQueue playQueue) {
+    @NonNull
+    public static Intent getPlayerIntent(@NonNull final Context context,
+                                         @NonNull final Class targetClazz,
+                                         @NonNull final PlayQueue playQueue) {
         return getPlayerIntent(context, targetClazz, playQueue, null);
     }
 
-    public static Intent getPlayerEnqueueIntent(final Context context,
-                                                final Class targetClazz,
-                                                final PlayQueue playQueue,
+    @NonNull
+    public static Intent getPlayerEnqueueIntent(@NonNull final Context context,
+                                                @NonNull final Class targetClazz,
+                                                @NonNull final PlayQueue playQueue,
                                                 final boolean selectOnAppend) {
         return getPlayerIntent(context, targetClazz, playQueue)
                 .putExtra(BasePlayer.APPEND_ONLY, true)
                 .putExtra(BasePlayer.SELECT_ON_APPEND, selectOnAppend);
     }
 
-    public static Intent getPlayerIntent(final Context context,
-                                         final Class targetClazz,
-                                         final PlayQueue playQueue,
+    @NonNull
+    public static Intent getPlayerIntent(@NonNull final Context context,
+                                         @NonNull final Class targetClazz,
+                                         @NonNull final PlayQueue playQueue,
                                          final int repeatMode,
                                          final float playbackSpeed,
                                          final float playbackPitch,
-                                         final String playbackQuality) {
+                                         @Nullable final String playbackQuality) {
         return getPlayerIntent(context, targetClazz, playQueue, playbackQuality)
                 .putExtra(BasePlayer.REPEAT_MODE, repeatMode)
                 .putExtra(BasePlayer.PLAYBACK_SPEED, playbackSpeed)
@@ -131,12 +142,12 @@ public class NavigationHelper {
         }
 
         Toast.makeText(context, R.string.popup_playing_toast, Toast.LENGTH_SHORT).show();
-        context.startService(getPlayerIntent(context, PopupVideoPlayer.class, queue));
+        startService(context, getPlayerIntent(context, PopupVideoPlayer.class, queue));
     }
 
     public static void playOnBackgroundPlayer(final Context context, final PlayQueue queue) {
         Toast.makeText(context, R.string.background_player_playing_toast, Toast.LENGTH_SHORT).show();
-        context.startService(getPlayerIntent(context, BackgroundPlayer.class, queue));
+        startService(context, getPlayerIntent(context, BackgroundPlayer.class, queue));
     }
 
     public static void enqueueOnPopupPlayer(final Context context, final PlayQueue queue) {
@@ -150,7 +161,8 @@ public class NavigationHelper {
         }
 
         Toast.makeText(context, R.string.popup_playing_append, Toast.LENGTH_SHORT).show();
-        context.startService(getPlayerEnqueueIntent(context, PopupVideoPlayer.class, queue, selectOnAppend));
+        startService(context,
+                getPlayerEnqueueIntent(context, PopupVideoPlayer.class, queue, selectOnAppend));
     }
 
     public static void enqueueOnBackgroundPlayer(final Context context, final PlayQueue queue) {
@@ -159,7 +171,16 @@ public class NavigationHelper {
 
     public static void enqueueOnBackgroundPlayer(final Context context, final PlayQueue queue, boolean selectOnAppend) {
         Toast.makeText(context, R.string.background_player_append, Toast.LENGTH_SHORT).show();
-        context.startService(getPlayerEnqueueIntent(context, BackgroundPlayer.class, queue, selectOnAppend));
+        startService(context,
+                getPlayerEnqueueIntent(context, BackgroundPlayer.class, queue, selectOnAppend));
+    }
+
+    public static void startService(@NonNull final Context context, @NonNull final Intent intent) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            context.startForegroundService(intent);
+        } else {
+            context.startService(intent);
+        }
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -229,6 +250,12 @@ public class NavigationHelper {
     // Through FragmentManager
     //////////////////////////////////////////////////////////////////////////*/
 
+    @SuppressLint("CommitTransaction")
+    private static FragmentTransaction defaultTransaction(FragmentManager fragmentManager) {
+        return fragmentManager.beginTransaction()
+                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out);
+    }
+
     public static void gotoMainFragment(FragmentManager fragmentManager) {
         ImageLoader.getInstance().clearMemoryCache();
 
@@ -240,8 +267,7 @@ public class NavigationHelper {
         InfoCache.getInstance().trimCache();
 
         fragmentManager.popBackStackImmediate(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, new MainFragment())
                 .addToBackStack(MAIN_FRAGMENT_TAG)
                 .commit();
@@ -258,8 +284,7 @@ public class NavigationHelper {
     }
 
     public static void openSearchFragment(FragmentManager fragmentManager, int serviceId, String query) {
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, SearchFragment.getInstance(serviceId, query))
                 .addToBackStack(SEARCH_FRAGMENT_TAG)
                 .commit();
@@ -283,8 +308,7 @@ public class NavigationHelper {
         VideoDetailFragment instance = VideoDetailFragment.getInstance(serviceId, url, title);
         instance.setAutoplay(autoPlay);
 
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, instance)
                 .addToBackStack(null)
                 .commit();
@@ -292,8 +316,7 @@ public class NavigationHelper {
 
     public static void openChannelFragment(FragmentManager fragmentManager, int serviceId, String url, String name) {
         if (name == null) name = "";
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, ChannelFragment.getInstance(serviceId, url, name))
                 .addToBackStack(null)
                 .commit();
@@ -301,25 +324,21 @@ public class NavigationHelper {
 
     public static void openPlaylistFragment(FragmentManager fragmentManager, int serviceId, String url, String name) {
         if (name == null) name = "";
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, PlaylistFragment.getInstance(serviceId, url, name))
                 .addToBackStack(null)
                 .commit();
     }
 
     public static void openWhatsNewFragment(FragmentManager fragmentManager) {
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, new FeedFragment())
                 .addToBackStack(null)
                 .commit();
     }
 
-    public static void openKioskFragment(FragmentManager fragmentManager, int serviceId, String kioskId)
-        throws ExtractionException {
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+    public static void openKioskFragment(FragmentManager fragmentManager, int serviceId, String kioskId) throws ExtractionException {
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, KioskFragment.getInstance(serviceId, kioskId))
                 .addToBackStack(null)
                 .commit();
@@ -327,28 +346,33 @@ public class NavigationHelper {
 
     public static void openLocalPlaylistFragment(FragmentManager fragmentManager, long playlistId, String name) {
         if (name == null) name = "";
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, LocalPlaylistFragment.getInstance(playlistId, name))
                 .addToBackStack(null)
                 .commit();
     }
 
     public static void openLastPlayedFragment(FragmentManager fragmentManager) {
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, new LastPlayedFragment())
                 .addToBackStack(null)
                 .commit();
     }
 
     public static void openMostPlayedFragment(FragmentManager fragmentManager) {
-        fragmentManager.beginTransaction()
-                .setCustomAnimations(R.animator.custom_fade_in, R.animator.custom_fade_out, R.animator.custom_fade_in, R.animator.custom_fade_out)
+        defaultTransaction(fragmentManager)
                 .replace(R.id.fragment_holder, new MostPlayedFragment())
                 .addToBackStack(null)
                 .commit();
     }
+
+    public static void openSubscriptionsImportFragment(FragmentManager fragmentManager, int serviceId) {
+        defaultTransaction(fragmentManager)
+                .replace(R.id.fragment_holder, SubscriptionsImportFragment.getInstance(serviceId))
+                .addToBackStack(null)
+                .commit();
+    }
+
     /*//////////////////////////////////////////////////////////////////////////
     // Through Intents
     //////////////////////////////////////////////////////////////////////////*/

app/src/main/java/org/schabi/newpipe/util/PopupMenuIconHacker.java

@@ -1,48 +0,0 @@
-package org.schabi.newpipe.util;
-
-import android.widget.PopupMenu;
-
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-
-/**
- * Created by Christian Schabesberger on 20.01.18.
- * Copyright 2018 Christian Schabesberger <chris.schabesberger@mailbox.org>
- * PopupMenuIconHacker.java is part of NewPipe
- *
- * License: GPL-3.0+
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-public class PopupMenuIconHacker {
-    public static void setShowPopupIcon(PopupMenu menu) throws Exception {
-        try {
-            Field[] fields = menu.getClass().getDeclaredFields();
-            for (Field field : fields) {
-                if ("mPopup".equals(field.getName())) {
-                    field.setAccessible(true);
-                    Object menuPopupHelper = field.get(menu);
-                    Class<?> classPopupHelper = Class.forName(menuPopupHelper
-                            .getClass().getName());
-                    Method setForceIcons = classPopupHelper.getMethod(
-                            "setForceShowIcon", boolean.class);
-                    setForceIcons.invoke(menuPopupHelper, true);
-                    break;
-                }
-            }
-        } catch (Exception e) {
-            throw new Exception("Could not make Popup menu show Icons", e);
-        }
-    }
-}

app/src/main/java/org/schabi/newpipe/util/SerializedCache.java

@@ -0,0 +1,112 @@
+package org.schabi.newpipe.util;
+
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.util.LruCache;
+import android.util.Log;
+
+import org.schabi.newpipe.MainActivity;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.UUID;
+
+public class SerializedCache {
+    private static final boolean DEBUG = MainActivity.DEBUG;
+    private final String TAG = getClass().getSimpleName();
+
+    private static final SerializedCache instance = new SerializedCache();
+    private static final int MAX_ITEMS_ON_CACHE = 5;
+
+    private static final LruCache<String, CacheData> lruCache =
+            new LruCache<>(MAX_ITEMS_ON_CACHE);
+
+    private SerializedCache() {
+        //no instance
+    }
+
+    public static SerializedCache getInstance() {
+        return instance;
+    }
+
+    @Nullable
+    public <T> T take(@NonNull final String key, @NonNull final Class<T> type) {
+        if (DEBUG) Log.d(TAG, "take() called with: key = [" + key + "]");
+        synchronized (lruCache) {
+            return lruCache.get(key) != null ? getItem(lruCache.remove(key), type) : null;
+        }
+    }
+
+    @Nullable
+    public <T> T get(@NonNull final String key, @NonNull final Class<T> type) {
+        if (DEBUG) Log.d(TAG, "get() called with: key = [" + key + "]");
+        synchronized (lruCache) {
+            final CacheData data = lruCache.get(key);
+            return data != null ? getItem(data, type) : null;
+        }
+    }
+
+    @Nullable
+    public <T extends Serializable> String put(@NonNull T item, @NonNull final Class<T> type) {
+        final String key = UUID.randomUUID().toString();
+        return put(key, item, type) ? key : null;
+    }
+
+    public <T extends Serializable> boolean put(@NonNull final String key, @NonNull T item,
+                                                @NonNull final Class<T> type) {
+        if (DEBUG) Log.d(TAG, "put() called with: key = [" + key + "], item = [" + item + "]");
+        synchronized (lruCache) {
+            try {
+                lruCache.put(key, new CacheData<>(clone(item, type), type));
+                return true;
+            } catch (final Exception error) {
+                Log.e(TAG, "Serialization failed for: ", error);
+            }
+        }
+        return false;
+    }
+
+    public void clear() {
+        if (DEBUG) Log.d(TAG, "clear() called");
+        synchronized (lruCache) {
+            lruCache.evictAll();
+        }
+    }
+
+    public long size() {
+        synchronized (lruCache) {
+            return lruCache.size();
+        }
+    }
+
+    @Nullable
+    private <T> T getItem(@NonNull final CacheData data, @NonNull final Class<T> type) {
+        return type.isAssignableFrom(data.type) ? type.cast(data.item) : null;
+    }
+
+    @NonNull
+    private <T extends Serializable> T clone(@NonNull T item,
+                                             @NonNull final Class<T> type) throws Exception {
+        final ByteArrayOutputStream bytesOutput = new ByteArrayOutputStream();
+        try (final ObjectOutputStream objectOutput = new ObjectOutputStream(bytesOutput)) {
+            objectOutput.writeObject(item);
+            objectOutput.flush();
+        }
+        final Object clone = new ObjectInputStream(
+                new ByteArrayInputStream(bytesOutput.toByteArray())).readObject();
+        return type.cast(clone);
+    }
+
+    final private static class CacheData<T> {
+        private final T item;
+        private final Class<T> type;
+
+        private CacheData(@NonNull final T item, @NonNull Class<T> type) {
+            this.item = item;
+            this.type = type;
+        }
+    }
+}

app/src/main/java/org/schabi/newpipe/util/ServiceHelper.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.util;
 import android.content.Context;
 import android.preference.PreferenceManager;
 import android.support.annotation.DrawableRes;
+import android.support.annotation.StringRes;
 
 import org.schabi.newpipe.BuildConfig;
 import org.schabi.newpipe.R;
@@ -11,6 +12,10 @@ import org.schabi.newpipe.extractor.ServiceList;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 
+import java.util.concurrent.TimeUnit;
+
+import static org.schabi.newpipe.extractor.ServiceList.SoundCloud;
+
 public class ServiceHelper {
     private static final StreamingService DEFAULT_FALLBACK_SERVICE = ServiceList.YouTube;
 
@@ -26,6 +31,39 @@ public class ServiceHelper {
         }
     }
 
+    /**
+     * Get a resource string with instructions for importing subscriptions for each service.
+     *
+     * @return the string resource containing the instructions or -1 if the service don't support it
+     */
+    @StringRes
+    public static int getImportInstructions(int serviceId) {
+        switch (serviceId) {
+            case 0:
+                return R.string.import_youtube_instructions;
+            case 1:
+                return R.string.import_soundcloud_instructions;
+            default:
+                return -1;
+        }
+    }
+
+    /**
+     * For services that support importing from a channel url, return a hint that will
+     * be used in the EditText that the user will type in his channel url.
+     *
+     * @return the hint's string resource or -1 if the service don't support it
+     */
+    @StringRes
+    public static int getImportInstructionsHint(int serviceId) {
+        switch (serviceId) {
+            case 1:
+                return R.string.import_soundcloud_instructions_hint;
+            default:
+                return -1;
+        }
+    }
+
     public static int getSelectedServiceId(Context context) {
         if (BuildConfig.BUILD_TYPE.equals("release")) return DEFAULT_FALLBACK_SERVICE.getServiceId();
 
@@ -64,4 +102,12 @@ public class ServiceHelper {
         PreferenceManager.getDefaultSharedPreferences(context).edit().
                 putString(context.getString(R.string.current_service_key), serviceName).apply();
     }
+
+    public static long getCacheExpirationMillis(final int serviceId) {
+        if (serviceId == SoundCloud.getServiceId()) {
+            return TimeUnit.MILLISECONDS.convert(5, TimeUnit.MINUTES);
+        } else {
+            return TimeUnit.MILLISECONDS.convert(1, TimeUnit.HOURS);
+        }
+    }
 }

app/src/main/java/org/schabi/newpipe/util/SliderStrategy.java

@@ -0,0 +1,73 @@
+package org.schabi.newpipe.util;
+
+public interface SliderStrategy {
+    /**
+     * Converts from zeroed double with a minimum offset to the nearest rounded slider
+     * equivalent integer
+     * */
+    int progressOf(final double value);
+
+    /**
+     * Converts from slider integer value to an equivalent double value with a given
+     * minimum offset
+     * */
+    double valueOf(final int progress);
+
+    // TODO: also implement linear strategy when needed
+
+    final class Quadratic implements SliderStrategy {
+        private final double leftGap;
+        private final double rightGap;
+        private final double center;
+
+        private final int centerProgress;
+
+        /**
+         * Quadratic slider strategy that scales the value of a slider given how far the slider
+         * progress is from the center of the slider. The further away from the center,
+         * the faster the interpreted value changes, and vice versa.
+         *
+         * @param minimum the minimum value of the interpreted value of the slider.
+         * @param maximum the maximum value of the interpreted value of the slider.
+         * @param center center of the interpreted value between the minimum and maximum, which
+         *               will be used as the center value on the slider progress. Doesn't need
+         *               to be the average of the minimum and maximum values, but must be in
+         *               between the two.
+         * @param maxProgress the maximum possible progress of the slider, this is the
+         *                    value that is shown for the UI and controls the granularity of
+         *                    the slider. Should be as large as possible to avoid floating
+         *                    point round-off error. Using odd number is recommended.
+         * */
+        public Quadratic(double minimum, double maximum, double center, int maxProgress) {
+            if (center < minimum || center > maximum) {
+                throw new IllegalArgumentException("Center must be in between minimum and maximum");
+            }
+
+            this.leftGap = minimum - center;
+            this.rightGap = maximum - center;
+            this.center = center;
+
+            this.centerProgress = maxProgress / 2;
+        }
+
+        @Override
+        public int progressOf(double value) {
+            final double difference = value - center;
+            final double root = difference >= 0 ?
+                    Math.sqrt(difference / rightGap) :
+                    -Math.sqrt(Math.abs(difference / leftGap));
+            final double offset = Math.round(root * centerProgress);
+
+            return (int) (centerProgress + offset);
+        }
+
+        @Override
+        public double valueOf(int progress) {
+            final int offset = progress - centerProgress;
+            final double square = Math.pow(((double) offset) / ((double) centerProgress), 2);
+            final double difference = square * (offset >= 0 ? rightGap : leftGap);
+
+            return difference + center;
+        }
+    }
+}