Implement new feed and subscriptions groups

- Introduce Groupie for easier lists implementations
- Use some of the new components of the Android Architecture libraries
- Add a bunch of icons for groups, using vectors, which still is
compatible with older APIs through the compatibility layer

app/build.gradle

@@ -79,6 +79,11 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
+
+    // Required and used only by groupie
+    androidExtensions {
+        experimental = true
+    }
 }
 
 ext {
@@ -111,6 +116,13 @@ dependencies {
     implementation "androidx.cardview:cardview:${androidxLibVersion}"
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
 
+    implementation 'com.xwray:groupie:2.3.0'
+    implementation 'com.xwray:groupie-kotlin-android-extensions:2.3.0'
+
+    implementation 'androidx.lifecycle:lifecycle-livedata:2.0.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel:2.0.0'
+    implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
+
     // Originally in NewPipeExtractor
     implementation 'com.grack:nanojson:1.1'
     implementation 'org.jsoup:jsoup:1.9.2'

app/schemas/org.schabi.newpipe.database.AppDatabase/3.json

@@ -564,7 +564,7 @@
             "notNull": true
           },
           {
-            "fieldPath": "iconId",
+            "fieldPath": "icon",
             "columnName": "icon_id",
             "affinity": "INTEGER",
             "notNull": true

app/src/main/AndroidManifest.xml

@@ -74,6 +74,7 @@
 
         <service android:name=".local.subscription.services.SubscriptionsImportService"/>
         <service android:name=".local.subscription.services.SubscriptionsExportService"/>
+        <service android:name=".local.feed.service.FeedLoadService"/>
 
         <activity
             android:name=".PanicResponderActivity"

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

@@ -240,7 +240,7 @@ public class MainActivity extends AppCompatActivity {
                 NavigationHelper.openSubscriptionFragment(getSupportFragmentManager());
                 break;
             case ITEM_ID_FEED:
-                NavigationHelper.openWhatsNewFragment(getSupportFragmentManager());
+                NavigationHelper.openFeedFragment(getSupportFragmentManager());
                 break;
             case ITEM_ID_BOOKMARKS:
                 NavigationHelper.openBookmarksFragment(getSupportFragmentManager());

app/src/main/java/org/schabi/newpipe/database/Converters.java

@@ -3,6 +3,7 @@ package org.schabi.newpipe.database;
 import androidx.room.TypeConverter;
 
 import org.schabi.newpipe.extractor.stream.StreamType;
+import org.schabi.newpipe.local.subscription.FeedGroupIcon;
 
 import java.util.Date;
 
@@ -37,4 +38,18 @@ public class Converters {
     public static String stringOf(StreamType streamType) {
         return streamType.name();
     }
+
+    @TypeConverter
+    public static Integer integerOf(FeedGroupIcon feedGroupIcon) {
+        return feedGroupIcon.getId();
+    }
+
+    @TypeConverter
+    public static FeedGroupIcon feedGroupIconOf(Integer id) {
+        for (FeedGroupIcon icon : FeedGroupIcon.values()) {
+            if (icon.getId() == id) return icon;
+        }
+
+        throw new IllegalArgumentException("There's no feed group icon with the id \"" + id + "\"");
+    }
 }

app/src/main/java/org/schabi/newpipe/database/feed/dao/FeedDAO.kt

@@ -7,6 +7,7 @@ import androidx.room.Query
 import io.reactivex.Flowable
 import org.schabi.newpipe.database.feed.model.FeedEntity
 import org.schabi.newpipe.database.stream.model.StreamEntity
+import java.util.*
 
 @Dao
 abstract class FeedDAO {
@@ -19,7 +20,9 @@ abstract class FeedDAO {
         INNER JOIN feed f
         ON s.uid = f.stream_id
 
-        ORDER BY s.upload_date IS NULL DESC, s.upload_date DESC
+        ORDER BY s.upload_date IS NULL DESC, s.upload_date DESC, s.uploader ASC
+
+        LIMIT 500
         """)
     abstract fun getAllStreams(): Flowable<List<StreamEntity>>
 
@@ -36,12 +39,45 @@ abstract class FeedDAO {
         ON fg.uid = fgs.group_id
 
         WHERE fgs.group_id = :groupId
+
+        ORDER BY s.upload_date IS NULL DESC, s.upload_date DESC, s.uploader ASC
+        LIMIT 500
         """)
     abstract fun getAllStreamsFromGroup(groupId: Long): Flowable<List<StreamEntity>>
 
-    @Insert(onConflict = OnConflictStrategy.FAIL)
+    @Query("""
+        DELETE FROM feed WHERE
+
+        feed.stream_id IN (
+            SELECT s.uid FROM streams s
+
+            INNER JOIN feed f
+            ON s.uid = f.stream_id
+
+            WHERE s.upload_date < :date
+        )
+        """)
+    abstract fun unlinkStreamsOlderThan(date: Date)
+
+    @Query("""
+        DELETE FROM feed
+        
+        WHERE feed.subscription_id = :subscriptionId
+
+        AND feed.stream_id IN (
+            SELECT s.uid FROM streams s
+
+            INNER JOIN feed f
+            ON s.uid = f.stream_id
+
+            WHERE s.stream_type = "LIVE_STREAM" OR s.stream_type = "AUDIO_LIVE_STREAM"
+        )
+        """)
+    abstract fun unlinkOldLivestreams(subscriptionId: Long)
+
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
     abstract fun insert(feedEntity: FeedEntity)
 
-    @Insert(onConflict = OnConflictStrategy.FAIL)
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
     abstract fun insertAll(entities: List<FeedEntity>): List<Long>
 }

app/src/main/java/org/schabi/newpipe/database/feed/dao/FeedGroupDAO.kt

@@ -2,16 +2,43 @@ package org.schabi.newpipe.database.feed.dao
 
 import androidx.room.*
 import io.reactivex.Flowable
+import io.reactivex.Maybe
 import org.schabi.newpipe.database.feed.model.FeedGroupEntity
+import org.schabi.newpipe.database.feed.model.FeedGroupSubscriptionEntity
 
 @Dao
 abstract class FeedGroupDAO {
-    @Query("DELETE FROM feed_group")
-    abstract fun deleteAll(): Int
 
     @Query("SELECT * FROM feed_group")
     abstract fun getAll(): Flowable<List<FeedGroupEntity>>
 
+    @Query("SELECT * FROM feed_group WHERE uid = :groupId")
+    abstract fun getGroup(groupId: Long): Maybe<FeedGroupEntity>
+
     @Insert(onConflict = OnConflictStrategy.ABORT)
-    abstract fun insert(feedEntity: FeedGroupEntity)
+    abstract fun insert(feedEntity: FeedGroupEntity): Long
+
+    @Update(onConflict = OnConflictStrategy.IGNORE)
+    abstract fun update(feedGroupEntity: FeedGroupEntity): Int
+
+    @Query("DELETE FROM feed_group")
+    abstract fun deleteAll(): Int
+
+    @Query("DELETE FROM feed_group WHERE uid = :groupId")
+    abstract fun delete(groupId: Long): Int
+
+    @Query("SELECT subscription_id FROM feed_group_subscription_join WHERE group_id = :groupId")
+    abstract fun getSubscriptionIdsFor(groupId: Long): Flowable<List<Long>>
+
+    @Query("DELETE FROM feed_group_subscription_join WHERE group_id = :groupId")
+    abstract fun deleteSubscriptionsFromGroup(groupId: Long): Int
+
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    abstract fun insertSubscriptionsToGroup(entities: List<FeedGroupSubscriptionEntity>): List<Long>
+
+    @Transaction
+    open fun updateSubscriptionsForGroup(groupId: Long, subscriptionIds: List<Long>) {
+        deleteSubscriptionsFromGroup(groupId)
+        insertSubscriptionsToGroup(subscriptionIds.map { FeedGroupSubscriptionEntity(groupId, it) })
+    }
 }

app/src/main/java/org/schabi/newpipe/database/feed/model/FeedGroupEntity.kt

@@ -4,6 +4,7 @@ import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.PrimaryKey
 import org.schabi.newpipe.database.feed.model.FeedGroupEntity.Companion.FEED_GROUP_TABLE
+import org.schabi.newpipe.local.subscription.FeedGroupIcon
 
 @Entity(tableName = FEED_GROUP_TABLE)
 data class FeedGroupEntity(
@@ -15,7 +16,7 @@ data class FeedGroupEntity(
         var name: String,
 
         @ColumnInfo(name = ICON)
-        var iconId: Int
+        var icon: FeedGroupIcon
 ) {
     companion object {
         const val FEED_GROUP_TABLE = "feed_group"

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

@@ -1,72 +0,0 @@
-package org.schabi.newpipe.database.subscription;
-
-import androidx.room.Dao;
-import androidx.room.Insert;
-import androidx.room.OnConflictStrategy;
-import androidx.room.Query;
-import androidx.room.Transaction;
-
-import org.schabi.newpipe.database.BasicDAO;
-
-import java.util.List;
-
-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 abstract class SubscriptionDAO implements BasicDAO<SubscriptionEntity> {
-    @Override
-    @Query("SELECT * FROM " + SUBSCRIPTION_TABLE)
-    public abstract Flowable<List<SubscriptionEntity>> getAll();
-
-    @Query("SELECT COUNT(*) FROM subscriptions")
-    public abstract Flowable<Long> rowCount();
-
-    @Override
-    @Query("DELETE FROM " + SUBSCRIPTION_TABLE)
-    public abstract int deleteAll();
-
-    @Override
-    @Query("SELECT * FROM " + SUBSCRIPTION_TABLE + " WHERE " + SUBSCRIPTION_SERVICE_ID + " = :serviceId")
-    public abstract Flowable<List<SubscriptionEntity>> listByService(int serviceId);
-
-    @Query("SELECT * FROM " + SUBSCRIPTION_TABLE + " WHERE " +
-            SUBSCRIPTION_URL + " LIKE :url AND " +
-            SUBSCRIPTION_SERVICE_ID + " = :serviceId")
-    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/SubscriptionDAO.kt

@@ -0,0 +1,60 @@
+package org.schabi.newpipe.database.subscription
+
+import androidx.room.*
+import io.reactivex.Flowable
+import io.reactivex.Maybe
+import org.schabi.newpipe.database.BasicDAO
+
+@Dao
+abstract class SubscriptionDAO : BasicDAO<SubscriptionEntity> {
+    @Query("SELECT COUNT(*) FROM subscriptions")
+    abstract fun rowCount(): Flowable<Long>
+
+    @Query("SELECT * FROM subscriptions WHERE service_id = :serviceId")
+    abstract override fun listByService(serviceId: Int): Flowable<List<SubscriptionEntity>>
+
+    @Query("SELECT * FROM subscriptions ORDER BY name COLLATE NOCASE ASC")
+    abstract override fun getAll(): Flowable<List<SubscriptionEntity>>
+
+    @Query("SELECT * FROM subscriptions WHERE url LIKE :url AND service_id = :serviceId")
+    abstract fun getSubscriptionFlowable(serviceId: Int, url: String): Flowable<List<SubscriptionEntity>>
+
+    @Query("SELECT * FROM subscriptions WHERE url LIKE :url AND service_id = :serviceId")
+    abstract fun getSubscription(serviceId: Int, url: String): Maybe<SubscriptionEntity>
+
+    @Query("SELECT * FROM subscriptions WHERE uid = :subscriptionId")
+    abstract fun getSubscription(subscriptionId: Long): SubscriptionEntity
+
+    @Query("DELETE FROM subscriptions")
+    abstract override fun deleteAll(): Int
+
+    @Query("DELETE FROM subscriptions WHERE url LIKE :url AND service_id = :serviceId")
+    abstract fun deleteSubscription(serviceId: Int, url: String): Int
+
+    @Query("SELECT uid FROM subscriptions WHERE url LIKE :url AND service_id = :serviceId")
+    internal abstract fun getSubscriptionIdInternal(serviceId: Int, url: String): Long?
+
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    internal abstract fun silentInsertAllInternal(entities: List<SubscriptionEntity>): List<Long>
+
+    @Transaction
+    open fun upsertAll(entities: List<SubscriptionEntity>): List<SubscriptionEntity> {
+        val insertUidList = silentInsertAllInternal(entities)
+
+        insertUidList.forEachIndexed { index: Int, uidFromInsert: Long ->
+            val entity = entities[index]
+
+            if (uidFromInsert != -1L) {
+                entity.uid = uidFromInsert
+            } else {
+                val subscriptionIdFromDb = getSubscriptionIdInternal(entity.serviceId, entity.url)
+                                ?: throw IllegalStateException("Subscription cannot be null just after insertion.")
+                entity.uid = subscriptionIdFromDb
+
+                update(entity)
+            }
+        }
+
+        return entities
+    }
+}

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

@@ -19,14 +19,14 @@ import static org.schabi.newpipe.database.subscription.SubscriptionEntity.SUBSCR
         indices = {@Index(value = {SUBSCRIPTION_SERVICE_ID, SUBSCRIPTION_URL}, unique = true)})
 public class SubscriptionEntity {
 
-    public final static String SUBSCRIPTION_UID         = "uid";
+    public static final String SUBSCRIPTION_UID                = "uid";
-    final static String SUBSCRIPTION_TABLE              = "subscriptions";
+    public static final String SUBSCRIPTION_TABLE              = "subscriptions";
-    final static String SUBSCRIPTION_SERVICE_ID         = "service_id";
+    public static final String SUBSCRIPTION_SERVICE_ID         = "service_id";
-    final static String SUBSCRIPTION_URL                = "url";
+    public static final String SUBSCRIPTION_URL                = "url";
-    final static String SUBSCRIPTION_NAME               = "name";
+    public static final String SUBSCRIPTION_NAME               = "name";
-    final static String SUBSCRIPTION_AVATAR_URL         = "avatar_url";
+    public static final String SUBSCRIPTION_AVATAR_URL         = "avatar_url";
-    final static String SUBSCRIPTION_SUBSCRIBER_COUNT   = "subscriber_count";
+    public static final String SUBSCRIPTION_SUBSCRIBER_COUNT   = "subscriber_count";
-    final static String SUBSCRIPTION_DESCRIPTION        = "description";
+    public static final String SUBSCRIPTION_DESCRIPTION        = "description";
 
     @PrimaryKey(autoGenerate = true)
     private long uid = 0;

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

@@ -59,8 +59,11 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     @Override
     public void onAttach(Context context) {
         super.onAttach(context);
+
+        if (infoListAdapter == null) {
             infoListAdapter = new InfoListAdapter(activity);
         }
+    }
 
     @Override
     public void onDetach() {
@@ -78,7 +81,7 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     @Override
     public void onDestroy() {
         super.onDestroy();
-        StateSaver.onDestroy(savedState);
+        if (useDefaultStateSaving) StateSaver.onDestroy(savedState);
         PreferenceManager.getDefaultSharedPreferences(activity)
                 .unregisterOnSharedPreferenceChangeListener(this);
     }
@@ -103,6 +106,16 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
     //////////////////////////////////////////////////////////////////////////*/
 
     protected StateSaver.SavedState savedState;
+    protected boolean useDefaultStateSaving = true;
+
+    /**
+     * If the default implementation of {@link StateSaver.WriteRead} should be used.
+     *
+     * @see StateSaver
+     */
+    public void useDefaultStateSaving(boolean useDefault) {
+        this.useDefaultStateSaving = useDefault;
+    }
 
     @Override
     public String generateSuffix() {
@@ -112,26 +125,28 @@ public abstract class BaseListFragment<I, N> extends BaseStateFragment<I> implem
 
     @Override
     public void writeTo(Queue<Object> objectsToSave) {
-        objectsToSave.add(infoListAdapter.getItemsList());
+        if (useDefaultStateSaving) objectsToSave.add(infoListAdapter.getItemsList());
     }
 
     @Override
     @SuppressWarnings("unchecked")
     public void readFrom(@NonNull Queue<Object> savedObjects) throws Exception {
+        if (useDefaultStateSaving) {
             infoListAdapter.getItemsList().clear();
             infoListAdapter.getItemsList().addAll((List<InfoItem>) savedObjects.poll());
         }
+    }
 
     @Override
     public void onSaveInstanceState(Bundle bundle) {
         super.onSaveInstanceState(bundle);
-        savedState = StateSaver.tryToSave(activity.isChangingConfigurations(), savedState, bundle, this);
+        if (useDefaultStateSaving) savedState = StateSaver.tryToSave(activity.isChangingConfigurations(), savedState, bundle, this);
     }
 
     @Override
     protected void onRestoreInstanceState(@NonNull Bundle bundle) {
         super.onRestoreInstanceState(bundle);
-        savedState = StateSaver.tryToRestore(bundle, this);
+        if (useDefaultStateSaving) savedState = StateSaver.tryToRestore(bundle, this);
     }
 
     /*//////////////////////////////////////////////////////////////////////////

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

@@ -33,7 +33,7 @@ import org.schabi.newpipe.extractor.exceptions.ContentNotAvailableException;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.fragments.list.BaseListInfoFragment;
-import org.schabi.newpipe.local.subscription.SubscriptionService;
+import org.schabi.newpipe.local.subscription.SubscriptionManager;
 import org.schabi.newpipe.player.playqueue.ChannelPlayQueue;
 import org.schabi.newpipe.player.playqueue.PlayQueue;
 import org.schabi.newpipe.report.UserAction;
@@ -66,7 +66,7 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
 
     private final CompositeDisposable disposables = new CompositeDisposable();
     private Disposable subscribeButtonMonitor;
-    private SubscriptionService subscriptionService;
+    private SubscriptionManager subscriptionManager;
 
     /*//////////////////////////////////////////////////////////////////////////
     // Views
@@ -109,7 +109,7 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     @Override
     public void onAttach(Context context) {
         super.onAttach(context);
-        subscriptionService = SubscriptionService.getInstance(activity);
+        subscriptionManager = new SubscriptionManager(activity);
     }
 
     @Override
@@ -212,8 +212,8 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
                         0);
         };
 
-        final Observable<List<SubscriptionEntity>> observable = subscriptionService.subscriptionTable()
+        final Observable<List<SubscriptionEntity>> observable = subscriptionManager.subscriptionTable()
-                .getSubscription(info.getServiceId(), info.getUrl())
+                .getSubscriptionFlowable(info.getServiceId(), info.getUrl())
                 .toObservable();
 
         disposables.add(observable
@@ -231,16 +231,16 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
 
     }
 
-    private Function<Object, Object> mapOnSubscribe(final SubscriptionEntity subscription) {
+    private Function<Object, Object> mapOnSubscribe(final SubscriptionEntity subscription, ChannelInfo info) {
         return (@NonNull Object o) -> {
-            subscriptionService.subscriptionTable().insert(subscription);
+            subscriptionManager.insertSubscription(subscription, info);
             return o;
         };
     }
 
     private Function<Object, Object> mapOnUnsubscribe(final SubscriptionEntity subscription) {
         return (@NonNull Object o) -> {
-            subscriptionService.subscriptionTable().delete(subscription);
+            subscriptionManager.deleteSubscription(subscription);
             return o;
         };
     }
@@ -258,7 +258,7 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
                         "Updating Subscription for " + info.getUrl(),
                         R.string.subscription_update_failed);
 
-        disposables.add(subscriptionService.updateChannelInfo(info)
+        disposables.add(subscriptionManager.updateChannelInfo(info)
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(onComplete, onError));
@@ -288,7 +288,7 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
     private Consumer<List<SubscriptionEntity>> getSubscribeUpdateMonitor(final ChannelInfo info) {
         return (List<SubscriptionEntity> subscriptionEntities) -> {
             if (DEBUG)
-                Log.d(TAG, "subscriptionService.subscriptionTable.doOnNext() called with: subscriptionEntities = [" + subscriptionEntities + "]");
+                Log.d(TAG, "subscriptionManager.subscriptionTable.doOnNext() called with: subscriptionEntities = [" + subscriptionEntities + "]");
             if (subscribeButtonMonitor != null) subscribeButtonMonitor.dispose();
 
             if (subscriptionEntities.isEmpty()) {
@@ -300,7 +300,7 @@ public class ChannelFragment extends BaseListInfoFragment<ChannelInfo> {
                         info.getAvatarUrl(),
                         info.getDescription(),
                         info.getSubscriberCount());
-                subscribeButtonMonitor = monitorSubscribeButton(headerSubscribeButton, mapOnSubscribe(channel));
+                subscribeButtonMonitor = monitorSubscribeButton(headerSubscribeButton, mapOnSubscribe(channel, info));
             } else {
                 if (DEBUG) Log.d(TAG, "Found subscription to this channel!");
                 final SubscriptionEntity subscription = subscriptionEntities.get(0);

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

@@ -122,7 +122,7 @@ public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolde
         this.useGridVariant = useGridVariant;
     }
 
-    public void addInfoItemList(@Nullable final List<InfoItem> data) {
+    public void addInfoItemList(@Nullable final List<? extends InfoItem> data) {
         if (data == null) {
             return;
         }
@@ -147,6 +147,12 @@ public class InfoListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolde
         }
     }
 
+    public void setInfoItemList(List<? extends InfoItem> data) {
+        infoItemList.clear();
+        infoItemList.addAll(data);
+        notifyDataSetChanged();
+    }
+
     public void addInfoItem(@Nullable InfoItem data) {
         if (data == null) {
             return;

app/src/main/java/org/schabi/newpipe/local/feed/FeedDatabaseManager.kt

@@ -0,0 +1,150 @@
+package org.schabi.newpipe.local.feed
+
+import android.content.Context
+import android.preference.PreferenceManager
+import android.util.Log
+import io.reactivex.Completable
+import io.reactivex.Flowable
+import io.reactivex.Maybe
+import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.schedulers.Schedulers
+import org.schabi.newpipe.MainActivity.DEBUG
+import org.schabi.newpipe.NewPipeDatabase
+import org.schabi.newpipe.R
+import org.schabi.newpipe.database.feed.model.FeedEntity
+import org.schabi.newpipe.database.feed.model.FeedGroupEntity
+import org.schabi.newpipe.database.stream.model.StreamEntity
+import org.schabi.newpipe.extractor.stream.StreamInfoItem
+import org.schabi.newpipe.extractor.stream.StreamType
+import org.schabi.newpipe.local.subscription.FeedGroupIcon
+import java.util.*
+import kotlin.collections.ArrayList
+
+class FeedDatabaseManager(context: Context) {
+    private val database = NewPipeDatabase.getInstance(context)
+    private val feedTable = database.feedDAO()
+    private val feedGroupTable = database.feedGroupDAO()
+    private val streamTable = database.streamDAO()
+
+    companion object {
+        /**
+         * Only items that are newer than this will be saved.
+         */
+        val FEED_OLDEST_ALLOWED_DATE: Calendar = Calendar.getInstance().apply {
+            add(Calendar.WEEK_OF_YEAR, -13)
+            set(Calendar.HOUR_OF_DAY, 0)
+            set(Calendar.MINUTE, 0)
+            set(Calendar.SECOND, 0)
+            set(Calendar.MILLISECOND, 0)
+        }
+    }
+
+    fun groups() = feedGroupTable.getAll()
+
+    fun database() = database
+
+    fun asStreamItems(groupId: Long = -1): Flowable<List<StreamInfoItem>> {
+        val streams =
+                if (groupId >= 0) feedTable.getAllStreamsFromGroup(groupId)
+                else feedTable.getAllStreams()
+
+        return streams.map<List<StreamInfoItem>> {
+            val items = ArrayList<StreamInfoItem>(it.size)
+            for (streamEntity in it) items.add(streamEntity.toStreamInfoItem())
+            return@map items
+        }
+    }
+
+    fun upsertAll(subscriptionId: Long, items: List<StreamInfoItem>,
+                  oldestAllowedDate: Date = FEED_OLDEST_ALLOWED_DATE.time) {
+        val itemsToInsert = ArrayList<StreamInfoItem>()
+        loop@ for (streamItem in items) {
+            val uploadDate = streamItem.uploadDate
+
+            itemsToInsert += when {
+                uploadDate == null && streamItem.streamType == StreamType.LIVE_STREAM -> streamItem
+                uploadDate != null && uploadDate.date().time >= oldestAllowedDate -> streamItem
+                else -> continue@loop
+            }
+        }
+
+        feedTable.unlinkOldLivestreams(subscriptionId)
+
+        if (itemsToInsert.isNotEmpty()) {
+            val streamEntities = itemsToInsert.map { StreamEntity(it) }
+            val streamIds = streamTable.upsertAll(streamEntities)
+            val feedEntities = streamIds.map { FeedEntity(it, subscriptionId) }
+
+            feedTable.insertAll(feedEntities)
+        }
+    }
+
+    fun getLastUpdated(context: Context): Calendar? {
+        val lastUpdatedMillis = PreferenceManager.getDefaultSharedPreferences(context)
+                .getLong(context.getString(R.string.feed_last_updated_key), -1)
+
+        val calendar = Calendar.getInstance()
+        if (lastUpdatedMillis > 0) {
+            calendar.timeInMillis = lastUpdatedMillis
+            return calendar
+        }
+
+        return null
+    }
+
+    fun setLastUpdated(context: Context, lastUpdated: Calendar?) {
+        PreferenceManager.getDefaultSharedPreferences(context).edit()
+                .putLong(context.getString(R.string.feed_last_updated_key), lastUpdated?.timeInMillis ?: -1).apply()
+    }
+
+    fun removeOrphansOrOlderStreams(oldestAllowedDate: Date = FEED_OLDEST_ALLOWED_DATE.time) {
+        feedTable.unlinkStreamsOlderThan(oldestAllowedDate)
+        streamTable.deleteOrphans()
+    }
+
+    fun clear() {
+        feedTable.deleteAll()
+        val deletedOrphans = streamTable.deleteOrphans()
+        if (DEBUG) Log.d(this::class.java.simpleName, "clear() → streamTable.deleteOrphans() → $deletedOrphans")
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Feed Groups
+    ///////////////////////////////////////////////////////////////////////////
+
+    fun subscriptionIdsForGroup(groupId: Long): Flowable<List<Long>> {
+        return feedGroupTable.getSubscriptionIdsFor(groupId)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+    }
+
+    fun updateSubscriptionsForGroup(groupId: Long, subscriptionIds: List<Long>): Completable {
+        return Completable.fromCallable { feedGroupTable.updateSubscriptionsForGroup(groupId, subscriptionIds) }
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+    }
+
+    fun createGroup(name: String, icon: FeedGroupIcon): Maybe<Long> {
+        return Maybe.fromCallable { feedGroupTable.insert(FeedGroupEntity(0, name, icon)) }
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+    }
+
+    fun getGroup(groupId: Long): Maybe<FeedGroupEntity> {
+        return feedGroupTable.getGroup(groupId)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+    }
+
+    fun updateGroup(feedGroupEntity: FeedGroupEntity): Completable {
+        return Completable.fromCallable { feedGroupTable.update(feedGroupEntity) }
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+    }
+
+    fun deleteGroup(groupId: Long): Completable {
+        return Completable.fromCallable { feedGroupTable.delete(groupId) }
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+    }
+}

app/src/main/java/org/schabi/newpipe/local/feed/FeedFragment.java

@@ -1,444 +0,0 @@
-package org.schabi.newpipe.local.feed;
-
-import android.os.Bundle;
-import android.os.Handler;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.appcompat.app.ActionBar;
-import android.util.Log;
-import android.view.LayoutInflater;
-import android.view.Menu;
-import android.view.MenuInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-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.InfoItem;
-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.local.subscription.SubscriptionService;
-import org.schabi.newpipe.report.UserAction;
-
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Queue;
-import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.concurrent.atomic.AtomicInteger;
-
-import io.reactivex.Flowable;
-import io.reactivex.MaybeObserver;
-import io.reactivex.android.schedulers.AndroidSchedulers;
-import io.reactivex.disposables.CompositeDisposable;
-import io.reactivex.disposables.Disposable;
-
-public class FeedFragment extends BaseListFragment<List<SubscriptionEntity>, Void> {
-
-    private static final int OFF_SCREEN_ITEMS_COUNT = 3;
-    private static final int MIN_ITEMS_INITIAL_LOAD = 8;
-    private int FEED_LOAD_COUNT = MIN_ITEMS_INITIAL_LOAD;
-
-    private int subscriptionPoolSize;
-
-    private SubscriptionService subscriptionService;
-
-    private AtomicBoolean allItemsLoaded = new AtomicBoolean(false);
-    private HashSet<String> itemsLoaded = new HashSet<>();
-    private final AtomicInteger requestLoadedAtomic = new AtomicInteger();
-
-    private CompositeDisposable compositeDisposable = new CompositeDisposable();
-    private Disposable subscriptionObserver;
-    private Subscription feedSubscriber;
-
-    /*//////////////////////////////////////////////////////////////////////////
-    // Fragment LifeCycle
-    //////////////////////////////////////////////////////////////////////////*/
-
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        subscriptionService = SubscriptionService.getInstance(activity);
-
-        FEED_LOAD_COUNT = howManyItemsToLoad();
-    }
-
-    @Override
-    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
-
-        if(!useAsFrontPage) {
-            setTitle(activity.getString(R.string.fragment_whats_new));
-        }
-        return inflater.inflate(R.layout.fragment_feed, container, false);
-    }
-
-    @Override
-    public void onPause() {
-        super.onPause();
-        disposeEverything();
-    }
-
-    @Override
-    public void onResume() {
-        super.onResume();
-        if (wasLoading.get()) doInitialLoadLogic();
-    }
-
-    @Override
-    public void onDestroy() {
-        super.onDestroy();
-
-        disposeEverything();
-        subscriptionService = null;
-        compositeDisposable = null;
-        subscriptionObserver = null;
-        feedSubscriber = null;
-    }
-
-    @Override
-    public void onDestroyView() {
-        // Do not monitor for updates when user is not viewing the feed fragment.
-        // This is a waste of bandwidth.
-        disposeEverything();
-        super.onDestroyView();
-    }
-
-    @Override
-    public void setUserVisibleHint(boolean isVisibleToUser) {
-        super.setUserVisibleHint(isVisibleToUser);
-        if (activity != null && isVisibleToUser) {
-            setTitle(activity.getString(R.string.fragment_whats_new));
-        }
-    }
-
-    @Override
-    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
-        super.onCreateOptionsMenu(menu, inflater);
-
-        ActionBar supportActionBar = activity.getSupportActionBar();
-
-        if(useAsFrontPage) {
-            supportActionBar.setDisplayShowTitleEnabled(true);
-            //supportActionBar.setDisplayShowTitleEnabled(false);
-        }
-    }
-
-    @Override
-    public void reloadContent() {
-        resetFragment();
-        super.reloadContent();
-    }
-
-    /*//////////////////////////////////////////////////////////////////////////
-    // StateSaving
-    //////////////////////////////////////////////////////////////////////////*/
-
-    @Override
-    public void writeTo(Queue<Object> objectsToSave) {
-        super.writeTo(objectsToSave);
-        objectsToSave.add(allItemsLoaded);
-        objectsToSave.add(itemsLoaded);
-    }
-
-    @Override
-    @SuppressWarnings("unchecked")
-    public void readFrom(@NonNull Queue<Object> savedObjects) throws Exception {
-        super.readFrom(savedObjects);
-        allItemsLoaded = (AtomicBoolean) savedObjects.poll();
-        itemsLoaded = (HashSet<String>) savedObjects.poll();
-    }
-
-    /*//////////////////////////////////////////////////////////////////////////
-    // Feed Loader
-    //////////////////////////////////////////////////////////////////////////*/
-
-    @Override
-    public void startLoading(boolean forceLoad) {
-        if (DEBUG) Log.d(TAG, "startLoading() called with: forceLoad = [" + forceLoad + "]");
-        if (subscriptionObserver != null) subscriptionObserver.dispose();
-
-        if (allItemsLoaded.get()) {
-            if (infoListAdapter.getItemsList().size() == 0) {
-                showEmptyState();
-            } else {
-                showListFooter(false);
-                hideLoading();
-            }
-
-            isLoading.set(false);
-            return;
-        }
-
-        isLoading.set(true);
-        showLoading();
-        showListFooter(true);
-        subscriptionObserver = subscriptionService.getSubscription()
-                .onErrorReturnItem(Collections.emptyList())
-                .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(this::handleResult, this::onError);
-    }
-
-    @Override
-    public void handleResult(@androidx.annotation.NonNull List<SubscriptionEntity> result) {
-        super.handleResult(result);
-
-        if (result.isEmpty()) {
-            infoListAdapter.clearStreamItemList();
-            showEmptyState();
-            return;
-        }
-
-        subscriptionPoolSize = result.size();
-        Flowable.fromIterable(result)
-                .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(getSubscriptionObserver());
-    }
-
-    /**
-     * Responsible for reacting to user pulling request and starting a request for new feed stream.
-     * <p>
-     * On initialization, it automatically requests the amount of feed needed to display
-     * a minimum amount required (FEED_LOAD_SIZE).
-     * <p>
-     * Upon receiving a user pull, it creates a Single Observer to fetch the ChannelInfo
-     * containing the feed streams.
-     **/
-    private Subscriber<SubscriptionEntity> getSubscriptionObserver() {
-        return new Subscriber<SubscriptionEntity>() {
-            @Override
-            public void onSubscribe(Subscription s) {
-                if (feedSubscriber != null) feedSubscriber.cancel();
-                feedSubscriber = s;
-
-                int requestSize = FEED_LOAD_COUNT - infoListAdapter.getItemsList().size();
-                if (wasLoading.getAndSet(false)) requestSize = FEED_LOAD_COUNT;
-
-                boolean hasToLoad = requestSize > 0;
-                if (hasToLoad) {
-                    requestLoadedAtomic.set(infoListAdapter.getItemsList().size());
-                    requestFeed(requestSize);
-                }
-                isLoading.set(hasToLoad);
-            }
-
-            @Override
-            public void onNext(SubscriptionEntity subscriptionEntity) {
-                if (!itemsLoaded.contains(subscriptionEntity.getServiceId() + subscriptionEntity.getUrl())) {
-                    subscriptionService.getChannelInfo(subscriptionEntity)
-                            .observeOn(AndroidSchedulers.mainThread())
-                            .onErrorComplete(
-                                    (@io.reactivex.annotations.NonNull Throwable throwable) ->
-                                            FeedFragment.super.onError(throwable))
-                            .subscribe(
-                                    getChannelInfoObserver(subscriptionEntity.getServiceId(),
-                                            subscriptionEntity.getUrl()));
-                } else {
-                    requestFeed(1);
-                }
-            }
-
-            @Override
-            public void onError(Throwable exception) {
-                FeedFragment.this.onError(exception);
-            }
-
-            @Override
-            public void onComplete() {
-                if (DEBUG) Log.d(TAG, "getSubscriptionObserver > onComplete() called");
-            }
-        };
-    }
-
-    /**
-     * On each request, a subscription item from the updated table is transformed
-     * into a ChannelInfo, containing the latest streams from the channel.
-     * <p>
-     * Currently, the feed uses the first into from the list of streams.
-     * <p>
-     * If chosen feed already displayed, then we request another feed from another
-     * subscription, until the subscription table runs out of new items.
-     * <p>
-     * This Observer is self-contained and will close itself when complete. However, this
-     * does not obey the fragment lifecycle and may continue running in the background
-     * until it is complete. This is done due to RxJava2 no longer propagate errors once
-     * an observer is unsubscribed while the thread process is still running.
-     * <p>
-     * To solve the above issue, we can either set a global RxJava Error Handler, or
-     * manage exceptions case by case. This should be done if the current implementation is
-     * too costly when dealing with larger subscription sets.
-     *
-     * @param url + serviceId to put in {@link #allItemsLoaded} to signal that this specific entity has been loaded.
-     */
-    private MaybeObserver<ChannelInfo> getChannelInfoObserver(final int serviceId, final String url) {
-        return new MaybeObserver<ChannelInfo>() {
-            private Disposable observer;
-
-            @Override
-            public void onSubscribe(Disposable d) {
-                observer = d;
-                compositeDisposable.add(d);
-                isLoading.set(true);
-            }
-
-            // Called only when response is non-empty
-            @Override
-            public void onSuccess(final ChannelInfo channelInfo) {
-                if (infoListAdapter == null || channelInfo.getRelatedItems().isEmpty()) {
-                    onDone();
-                    return;
-                }
-
-                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) {
-                    infoListAdapter.addInfoItem(item);
-                    //updateSubscription(channelInfo);
-                } else {
-                    requestFeed(1);
-                }
-                onDone();
-            }
-
-            @Override
-            public void onError(Throwable exception) {
-                showSnackBarError(exception,
-                        UserAction.SUBSCRIPTION,
-                        NewPipe.getNameOfService(serviceId),
-                        url, 0);
-                requestFeed(1);
-                onDone();
-            }
-
-            // Called only when response is empty
-            @Override
-            public void onComplete() {
-                onDone();
-            }
-
-            private void onDone() {
-                if (observer.isDisposed()) {
-                    return;
-                }
-
-                itemsLoaded.add(serviceId + url);
-                compositeDisposable.remove(observer);
-
-                int loaded = requestLoadedAtomic.incrementAndGet();
-                if (loaded >= Math.min(FEED_LOAD_COUNT, subscriptionPoolSize)) {
-                    requestLoadedAtomic.set(0);
-                    isLoading.set(false);
-                }
-
-                if (itemsLoaded.size() == subscriptionPoolSize) {
-                    if (DEBUG) Log.d(TAG, "getChannelInfoObserver > All Items Loaded");
-                    allItemsLoaded.set(true);
-                    showListFooter(false);
-                    isLoading.set(false);
-                    hideLoading();
-                    if (infoListAdapter.getItemsList().size() == 0) {
-                        showEmptyState();
-                    }
-                }
-            }
-        };
-    }
-
-    @Override
-    protected void loadMoreItems() {
-        isLoading.set(true);
-        delayHandler.removeCallbacksAndMessages(null);
-        // Add a little of a delay when requesting more items because the cache is so fast,
-        // that the view seems stuck to the user when he scroll to the bottom
-        delayHandler.postDelayed(() -> requestFeed(FEED_LOAD_COUNT), 300);
-    }
-
-    @Override
-    protected boolean hasMoreItems() {
-        return !allItemsLoaded.get();
-    }
-
-    private final Handler delayHandler = new Handler();
-
-    private void requestFeed(final int count) {
-        if (DEBUG) Log.d(TAG, "requestFeed() called with: count = [" + count + "], feedSubscriber = [" + feedSubscriber + "]");
-        if (feedSubscriber == null) return;
-
-        isLoading.set(true);
-        delayHandler.removeCallbacksAndMessages(null);
-        feedSubscriber.request(count);
-    }
-
-    /*//////////////////////////////////////////////////////////////////////////
-    // Utils
-    //////////////////////////////////////////////////////////////////////////*/
-
-    private void resetFragment() {
-        if (DEBUG) Log.d(TAG, "resetFragment() called");
-        if (subscriptionObserver != null) subscriptionObserver.dispose();
-        if (compositeDisposable != null) compositeDisposable.clear();
-        if (infoListAdapter != null) infoListAdapter.clearStreamItemList();
-
-        delayHandler.removeCallbacksAndMessages(null);
-        requestLoadedAtomic.set(0);
-        allItemsLoaded.set(false);
-        showListFooter(false);
-        itemsLoaded.clear();
-    }
-
-    private void disposeEverything() {
-        if (subscriptionObserver != null) subscriptionObserver.dispose();
-        if (compositeDisposable != null) compositeDisposable.clear();
-        if (feedSubscriber != null) feedSubscriber.cancel();
-        delayHandler.removeCallbacksAndMessages(null);
-    }
-
-    private boolean doesItemExist(final List<InfoItem> items, final InfoItem item) {
-        for (final InfoItem existingItem : items) {
-            if (existingItem.getInfoType() == item.getInfoType() &&
-                    existingItem.getServiceId() == item.getServiceId() &&
-                    existingItem.getName().equals(item.getName()) &&
-                    existingItem.getUrl().equals(item.getUrl())) return true;
-        }
-        return false;
-    }
-
-    private int howManyItemsToLoad() {
-        int heightPixels = getResources().getDisplayMetrics().heightPixels;
-        int itemHeightPixels = activity.getResources().getDimensionPixelSize(R.dimen.video_item_search_height);
-
-        int items = itemHeightPixels > 0
-                ? heightPixels / itemHeightPixels + OFF_SCREEN_ITEMS_COUNT
-                : MIN_ITEMS_INITIAL_LOAD;
-        return Math.max(MIN_ITEMS_INITIAL_LOAD, items);
-    }
-
-    /*//////////////////////////////////////////////////////////////////////////
-    // Fragment Error Handling
-    //////////////////////////////////////////////////////////////////////////*/
-
-    @Override
-    public void showError(String message, boolean showRetryButton) {
-        resetFragment();
-        super.showError(message, showRetryButton);
-    }
-
-    @Override
-    protected boolean onError(Throwable exception) {
-        if (super.onError(exception)) return true;
-
-        int errorId = exception instanceof ExtractionException
-                ? R.string.parsing_error
-                : R.string.general_error;
-        onUnrecoverableError(exception,
-                UserAction.SOMETHING_ELSE,
-                "none",
-                "Requesting feed",
-                errorId);
-        return true;
-    }
-}

app/src/main/java/org/schabi/newpipe/local/feed/FeedFragment.kt

@@ -0,0 +1,288 @@
+/*
+ * Copyright 2019 Mauricio Colli <mauriciocolli@outlook.com>
+ * FeedFragment.kt 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.local.feed
+
+import android.content.Intent
+import android.os.Build
+import android.os.Bundle
+import android.os.Parcelable
+import android.view.*
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProviders
+import icepick.State
+import io.reactivex.Completable
+import io.reactivex.schedulers.Schedulers
+import kotlinx.android.synthetic.main.error_retry.*
+import kotlinx.android.synthetic.main.fragment_feed.*
+import org.schabi.newpipe.R
+import org.schabi.newpipe.fragments.list.BaseListFragment
+import org.schabi.newpipe.local.feed.service.FeedLoadService
+import org.schabi.newpipe.report.UserAction
+import org.schabi.newpipe.util.AnimationUtils.animateView
+import org.schabi.newpipe.util.Localization
+
+class FeedFragment : BaseListFragment<FeedState, Unit>() {
+    private lateinit var viewModel: FeedViewModel
+    private lateinit var feedDatabaseManager: FeedDatabaseManager
+    @State @JvmField var listState: Parcelable? = null
+
+    private var groupId = -1L
+    private var groupName = ""
+
+    init {
+        setHasOptionsMenu(true)
+        useDefaultStateSaving(false)
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        groupId = arguments?.getLong(KEY_GROUP_ID, -1) ?: -1
+        groupName = arguments?.getString(KEY_GROUP_NAME) ?: ""
+
+        feedDatabaseManager = FeedDatabaseManager(requireContext())
+        if (feedDatabaseManager.getLastUpdated(requireContext()) == null) {
+            triggerUpdate()
+        }
+    }
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        return inflater.inflate(R.layout.fragment_feed, container, false)
+    }
+
+    override fun onViewCreated(rootView: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(rootView, savedInstanceState)
+
+        viewModel = ViewModelProviders.of(this, FeedViewModel.Factory(requireContext(), groupId)).get(FeedViewModel::class.java)
+        viewModel.stateLiveData.observe(viewLifecycleOwner, Observer { it?.let(::handleResult) })
+    }
+
+    override fun onPause() {
+        super.onPause()
+        listState = items_list?.layoutManager?.onSaveInstanceState()
+    }
+
+    override fun onResume() {
+        super.onResume()
+        updateRelativeTimeViews()
+    }
+
+    override fun setUserVisibleHint(isVisibleToUser: Boolean) {
+        super.setUserVisibleHint(isVisibleToUser)
+
+        if (!isVisibleToUser && view != null) {
+            updateRelativeTimeViews()
+        }
+    }
+
+    override fun initListeners() {
+        super.initListeners()
+        refresh_root_view.setOnClickListener {
+            triggerUpdate()
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Menu
+    ///////////////////////////////////////////////////////////////////////////
+
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
+        super.onCreateOptionsMenu(menu, inflater)
+        activity.supportActionBar?.setTitle(R.string.fragment_whats_new)
+        activity.supportActionBar?.subtitle = groupName
+    }
+
+    override fun onDestroyOptionsMenu() {
+        super.onDestroyOptionsMenu()
+        activity.supportActionBar?.subtitle = null
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Handling
+    ///////////////////////////////////////////////////////////////////////////
+
+    override fun showLoading() {
+        animateView(refresh_root_view, false, 0)
+        animateView(items_list, false, 0)
+
+        animateView(loading_progress_bar, true, 200)
+        animateView(loading_progress_text, true, 200)
+
+        empty_state_view?.let { animateView(it, false, 0) }
+        animateView(error_panel, false, 0)
+    }
+
+    override fun hideLoading() {
+        animateView(refresh_root_view, true, 200)
+        animateView(items_list, true, 300)
+
+        animateView(loading_progress_bar, false, 0)
+        animateView(loading_progress_text, false, 0)
+
+        empty_state_view?.let { animateView(it, false, 0) }
+        animateView(error_panel, false, 0)
+    }
+
+    override fun showEmptyState() {
+        animateView(refresh_root_view, true, 200)
+        animateView(items_list, false, 0)
+
+        animateView(loading_progress_bar, false, 0)
+        animateView(loading_progress_text, false, 0)
+
+        empty_state_view?.let { animateView(it, true, 800) }
+        animateView(error_panel, false, 0)
+    }
+
+    override fun showError(message: String, showRetryButton: Boolean) {
+        infoListAdapter.clearStreamItemList()
+        animateView(refresh_root_view, false, 120)
+        animateView(items_list, false, 120)
+
+        animateView(loading_progress_bar, false, 120)
+        animateView(loading_progress_text, false, 120)
+
+        error_message_view.text = message
+        animateView(error_button_retry, showRetryButton, if (showRetryButton) 600 else 0)
+        animateView(error_panel, true, 300)
+    }
+
+    override fun handleResult(result: FeedState) {
+        when (result) {
+            is FeedState.ProgressState -> handleProgressState(result)
+            is FeedState.LoadedState -> handleLoadedState(result)
+            is FeedState.ErrorState -> if (handleErrorState(result)) return
+        }
+
+        updateRefreshViewState()
+    }
+
+    private fun handleProgressState(progressState: FeedState.ProgressState) {
+        showLoading()
+
+        val isIndeterminate = progressState.currentProgress == -1 &&
+                progressState.maxProgress == -1
+
+        if (!isIndeterminate) {
+            loading_progress_text.text = "${progressState.currentProgress}/${progressState.maxProgress}"
+        } else if (progressState.progressMessage > 0) {
+            loading_progress_text?.setText(progressState.progressMessage)
+        } else {
+            loading_progress_text?.text = "∞/∞"
+        }
+
+        loading_progress_bar.isIndeterminate = isIndeterminate ||
+                (progressState.maxProgress > 0 && progressState.currentProgress == 0)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            loading_progress_bar?.setProgress(progressState.currentProgress, true)
+        } else {
+            loading_progress_bar.progress = progressState.currentProgress
+        }
+
+        loading_progress_bar.max = progressState.maxProgress
+    }
+
+    private fun handleLoadedState(loadedState: FeedState.LoadedState) {
+        infoListAdapter.setInfoItemList(loadedState.items)
+        listState?.run {
+            items_list.layoutManager?.onRestoreInstanceState(listState)
+            listState = null
+        }
+
+        if (!loadedState.itemsErrors.isEmpty()) {
+            showSnackBarError(loadedState.itemsErrors, UserAction.REQUESTED_FEED,
+                    "none", "Loading feed", R.string.general_error);
+        }
+
+        if (loadedState.items.isEmpty()) {
+            showEmptyState()
+        } else {
+            hideLoading()
+        }
+    }
+
+
+    private fun handleErrorState(errorState: FeedState.ErrorState): Boolean {
+        hideLoading()
+        errorState.error?.let {
+            onError(errorState.error)
+            return true
+        }
+        return false
+    }
+
+    private fun updateRelativeTimeViews() {
+        updateRefreshViewState()
+        infoListAdapter.notifyDataSetChanged()
+    }
+
+    private fun updateRefreshViewState() {
+        val lastUpdated = feedDatabaseManager.getLastUpdated(requireContext())
+        val updatedAt = when {
+            lastUpdated != null -> Localization.relativeTime(lastUpdated)
+            else -> "—"
+        }
+
+        refresh_text?.text = getString(R.string.feed_last_updated, updatedAt)
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Load Service Handling
+    ///////////////////////////////////////////////////////////////////////////
+
+    override fun doInitialLoadLogic() {}
+    override fun reloadContent() = triggerUpdate()
+    override fun loadMoreItems() {}
+    override fun hasMoreItems() = false
+
+    private fun triggerUpdate() {
+        getActivity()?.startService(Intent(requireContext(), FeedLoadService::class.java))
+        listState = null
+    }
+
+    override fun onError(exception: Throwable): Boolean {
+        if (super.onError(exception)) return true
+
+        if (useAsFrontPage) {
+            showSnackBarError(exception, UserAction.REQUESTED_FEED, "none", "Loading Feed", 0)
+            return true
+        }
+
+        onUnrecoverableError(exception, UserAction.REQUESTED_FEED, "none", "Loading Feed", 0)
+        return true
+    }
+
+    companion object {
+        const val KEY_GROUP_ID = "ARG_GROUP_ID"
+        const val KEY_GROUP_NAME = "ARG_GROUP_NAME"
+
+        @JvmStatic
+        fun newInstance(groupId: Long = -1, groupName: String? = null): FeedFragment {
+            val feedFragment = FeedFragment()
+
+            feedFragment.arguments = Bundle().apply {
+                putLong(KEY_GROUP_ID, groupId)
+                putString(KEY_GROUP_NAME, groupName)
+            }
+
+            return feedFragment
+        }
+    }
+}

app/src/main/java/org/schabi/newpipe/local/feed/FeedState.kt

@@ -0,0 +1,11 @@
+package org.schabi.newpipe.local.feed
+
+import androidx.annotation.StringRes
+import org.schabi.newpipe.extractor.stream.StreamInfoItem
+import java.util.*
+
+sealed class FeedState {
+    data class ProgressState(val currentProgress: Int = -1, val maxProgress: Int = -1, @StringRes val progressMessage: Int = 0) : FeedState()
+    data class LoadedState(val lastUpdated: Calendar? = null, val items: List<StreamInfoItem>, var itemsErrors: List<Throwable> = emptyList()) : FeedState()
+    data class ErrorState(val error: Throwable? = null) : FeedState()
+}

app/src/main/java/org/schabi/newpipe/local/feed/FeedViewModel.kt

@@ -0,0 +1,66 @@
+package org.schabi.newpipe.local.feed
+
+import android.content.Context
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import io.reactivex.Flowable
+import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.functions.Function3
+import io.reactivex.schedulers.Schedulers
+import org.schabi.newpipe.extractor.stream.StreamInfoItem
+import org.schabi.newpipe.local.feed.service.FeedEventManager
+import org.schabi.newpipe.local.subscription.SubscriptionManager
+import org.schabi.newpipe.util.DEFAULT_THROTTLE_TIMEOUT
+import java.util.concurrent.TimeUnit
+
+class FeedViewModel(applicationContext: Context, val groupId: Long = -1) : ViewModel() {
+    class Factory(val context: Context, val groupId: Long = -1) : ViewModelProvider.Factory {
+        @Suppress("UNCHECKED_CAST")
+        override fun <T : ViewModel?> create(modelClass: Class<T>): T {
+            return FeedViewModel(context.applicationContext, groupId) as T
+        }
+    }
+
+    private var feedDatabaseManager: FeedDatabaseManager = FeedDatabaseManager(applicationContext)
+    private var subscriptionManager: SubscriptionManager = SubscriptionManager(applicationContext)
+
+    val stateLiveData = MutableLiveData<FeedState>()
+
+    private var combineDisposable = Flowable
+            .combineLatest(
+                    FeedEventManager.events(),
+                    feedDatabaseManager.asStreamItems(groupId),
+                    subscriptionManager.subscriptionTable().rowCount(),
+
+                    Function3 { t1: FeedEventManager.Event, t2: List<StreamInfoItem>, t3: Long -> return@Function3 Triple(first = t1, second = t2, third = t3) }
+            )
+            .throttleLatest(DEFAULT_THROTTLE_TIMEOUT, TimeUnit.MILLISECONDS)
+            .subscribeOn(Schedulers.io())
+            .observeOn(AndroidSchedulers.mainThread())
+            .subscribe {
+                val (event, listFromDB, subsCount) = it
+
+                var lastUpdated = feedDatabaseManager.getLastUpdated(applicationContext)
+                if (subsCount == 0L && lastUpdated != null) {
+                    feedDatabaseManager.setLastUpdated(applicationContext, null)
+                    lastUpdated = null
+                }
+
+                stateLiveData.postValue(when (event) {
+                    is FeedEventManager.Event.IdleEvent -> FeedState.LoadedState(lastUpdated, listFromDB)
+                    is FeedEventManager.Event.ProgressEvent -> FeedState.ProgressState(event.currentProgress, event.maxProgress, event.progressMessage)
+                    is FeedEventManager.Event.SuccessResultEvent -> FeedState.LoadedState(lastUpdated, listFromDB, event.itemsErrors)
+                    is FeedEventManager.Event.ErrorResultEvent -> throw event.error
+                })
+
+                if (event is FeedEventManager.Event.ErrorResultEvent || event is FeedEventManager.Event.SuccessResultEvent) {
+                    FeedEventManager.reset()
+                }
+            }
+
+    override fun onCleared() {
+        super.onCleared()
+        combineDisposable.dispose()
+    }
+}

app/src/main/java/org/schabi/newpipe/local/feed/service/FeedEventManager.kt

@@ -0,0 +1,38 @@
+package org.schabi.newpipe.local.feed.service
+
+import androidx.annotation.StringRes
+import io.reactivex.Flowable
+import io.reactivex.processors.BehaviorProcessor
+import org.schabi.newpipe.local.feed.service.FeedEventManager.Event.IdleEvent
+import java.util.concurrent.atomic.AtomicBoolean
+
+object FeedEventManager {
+    private var processor: BehaviorProcessor<Event> = BehaviorProcessor.create()
+    private var ignoreUpstream = AtomicBoolean()
+    private var eventsFlowable = processor.startWith(IdleEvent)
+
+    fun postEvent(event: Event) {
+        processor.onNext(event)
+    }
+
+    fun events(): Flowable<Event> {
+        return eventsFlowable.filter { !ignoreUpstream.get() }
+    }
+
+    fun reset() {
+        ignoreUpstream.set(true)
+        postEvent(IdleEvent)
+        ignoreUpstream.set(false)
+    }
+
+    sealed class Event {
+        object IdleEvent : Event()
+        data class ProgressEvent(val currentProgress: Int = -1, val maxProgress: Int = -1, @StringRes val progressMessage: Int = 0) : Event() {
+            constructor(@StringRes progressMessage: Int) : this(-1, -1, progressMessage)
+        }
+
+        data class SuccessResultEvent(val itemsErrors: List<Throwable> = emptyList()) : Event()
+        data class ErrorResultEvent(val error: Throwable) : Event()
+    }
+
+}

app/src/main/java/org/schabi/newpipe/local/feed/service/FeedLoadService.kt

@@ -0,0 +1,399 @@
+/*
+ * Copyright 2019 Mauricio Colli <mauriciocolli@outlook.com>
+ * FeedLoadService.kt 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.local.feed.service
+
+import android.app.Service
+import android.content.Intent
+import android.os.Build
+import android.os.IBinder
+import android.util.Log
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import io.reactivex.Flowable
+import io.reactivex.Notification
+import io.reactivex.Single
+import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.disposables.CompositeDisposable
+import io.reactivex.functions.Consumer
+import io.reactivex.functions.Function
+import io.reactivex.processors.PublishProcessor
+import io.reactivex.schedulers.Schedulers
+import org.reactivestreams.Subscriber
+import org.reactivestreams.Subscription
+import org.schabi.newpipe.MainActivity.DEBUG
+import org.schabi.newpipe.R
+import org.schabi.newpipe.extractor.channel.ChannelInfo
+import org.schabi.newpipe.extractor.exceptions.ReCaptchaException
+import org.schabi.newpipe.local.feed.FeedDatabaseManager
+import org.schabi.newpipe.local.feed.service.FeedEventManager.Event.*
+import org.schabi.newpipe.local.feed.service.FeedEventManager.postEvent
+import org.schabi.newpipe.local.subscription.SubscriptionManager
+import org.schabi.newpipe.util.ExtractorHelper
+import java.io.IOException
+import java.util.*
+import java.util.concurrent.TimeUnit
+import java.util.concurrent.atomic.AtomicInteger
+import kotlin.collections.ArrayList
+
+class FeedLoadService : Service() {
+    companion object {
+        private val TAG = FeedLoadService::class.java.simpleName
+        private const val NOTIFICATION_ID = 7293450
+
+        /**
+         * How often the notification will be updated.
+         */
+        private const val NOTIFICATION_SAMPLING_PERIOD = 1500
+
+        /**
+         * How many extractions will be running in parallel.
+         */
+        private const val PARALLEL_EXTRACTIONS = 6
+
+        /**
+         * Number of items to buffer to mass-insert in the database.
+         */
+        private const val BUFFER_COUNT_BEFORE_INSERT = 20
+    }
+
+    private var loadingSubscription: Subscription? = null
+    private lateinit var subscriptionManager: SubscriptionManager
+
+    private lateinit var feedDatabaseManager: FeedDatabaseManager
+    private lateinit var feedResultsHolder: ResultsHolder
+
+    private var disposables = CompositeDisposable()
+    private var notificationUpdater = PublishProcessor.create<String>()
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Lifecycle
+    ///////////////////////////////////////////////////////////////////////////
+
+    override fun onCreate() {
+        super.onCreate()
+        subscriptionManager = SubscriptionManager(this)
+        feedDatabaseManager = FeedDatabaseManager(this)
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        if (DEBUG) {
+            Log.d(TAG, "onStartCommand() called with: intent = [" + intent + "]," +
+                    " flags = [" + flags + "], startId = [" + startId + "]")
+        }
+
+        if (intent == null || loadingSubscription != null) {
+            return START_NOT_STICKY
+        }
+
+        setupNotification()
+        startLoading()
+        return START_NOT_STICKY
+    }
+
+    private fun disposeAll() {
+        loadingSubscription?.cancel()
+        loadingSubscription = null
+
+        disposables.dispose()
+    }
+
+    private fun stopService() {
+        disposeAll()
+        stopForeground(true)
+        notificationManager.cancel(NOTIFICATION_ID)
+        stopSelf()
+    }
+
+    override fun onBind(intent: Intent): IBinder? {
+        return null
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Loading & Handling
+    ///////////////////////////////////////////////////////////////////////////
+
+    private class RequestException(message: String, cause: Throwable) : Exception(message, cause) {
+        companion object {
+            fun wrapList(info: ChannelInfo): List<Throwable> {
+                val toReturn = ArrayList<Throwable>(info.errors.size)
+                for (error in info.errors) {
+                    toReturn.add(RequestException(info.serviceId.toString() + ":" + info.url, error))
+                }
+                return toReturn
+            }
+        }
+    }
+
+    private fun startLoading() {
+        feedResultsHolder = ResultsHolder()
+
+        subscriptionManager
+                .subscriptions()
+                .limit(1)
+
+                .doOnNext {
+                    currentProgress.set(0)
+                    maxProgress.set(it.size)
+                }
+                .filter { it.isNotEmpty() }
+
+                .observeOn(AndroidSchedulers.mainThread())
+                .doOnNext {
+                    startForeground(NOTIFICATION_ID, notificationBuilder.build())
+                    updateNotificationProgress(null)
+                    broadcastProgress()
+                }
+
+                .observeOn(Schedulers.io())
+                .flatMap { Flowable.fromIterable(it) }
+
+                .parallel(PARALLEL_EXTRACTIONS)
+                .runOn(Schedulers.io())
+                .map { subscriptionEntity ->
+                    try {
+                        val channelInfo = ExtractorHelper
+                                .getChannelInfo(subscriptionEntity.serviceId, subscriptionEntity.url, true)
+                                .blockingGet()
+                        return@map Notification.createOnNext(Pair(subscriptionEntity.uid, channelInfo))
+                    } catch (e: Throwable) {
+                        val request = "${subscriptionEntity.serviceId}:${subscriptionEntity.url}"
+                        val wrapper = RequestException(request, e)
+                        return@map Notification.createOnError<Pair<Long, ChannelInfo>>(wrapper)
+                    }
+                }
+                .sequential()
+
+                .observeOn(AndroidSchedulers.mainThread())
+                .doOnNext(errorHandlingConsumer)
+
+                .observeOn(AndroidSchedulers.mainThread())
+                .doOnNext(notificationsConsumer)
+
+                .observeOn(Schedulers.io())
+                .buffer(BUFFER_COUNT_BEFORE_INSERT)
+                .doOnNext(databaseConsumer)
+
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(resultSubscriber)
+    }
+
+    private fun broadcastProgress() {
+        postEvent(ProgressEvent(currentProgress.get(), maxProgress.get()))
+    }
+
+    private val resultSubscriber
+        get() = object : Subscriber<List<Notification<Pair<Long, ChannelInfo>>>> {
+
+            override fun onSubscribe(s: Subscription) {
+                loadingSubscription = s
+                s.request(java.lang.Long.MAX_VALUE)
+            }
+
+            override fun onNext(notification: List<Notification<Pair<Long, ChannelInfo>>>) {
+                if (DEBUG) Log.v(TAG, "onNext() → $notification")
+            }
+
+            override fun onError(error: Throwable) {
+                handleError(error)
+            }
+
+            override fun onComplete() {
+                if (maxProgress.get() == 0) {
+                    postEvent(IdleEvent)
+                    stopService()
+
+                    return
+                }
+
+                currentProgress.set(-1)
+                maxProgress.set(-1)
+
+                notificationUpdater.onNext(getString(R.string.feed_processing_message))
+                postEvent(ProgressEvent(R.string.feed_processing_message))
+
+                disposables.add(Single
+                        .fromCallable {
+                            feedResultsHolder.ready()
+
+                            postEvent(ProgressEvent(R.string.feed_processing_message))
+                            feedDatabaseManager.removeOrphansOrOlderStreams()
+                            feedDatabaseManager.setLastUpdated(this@FeedLoadService, feedResultsHolder.lastUpdated)
+
+                            postEvent(SuccessResultEvent(feedResultsHolder.itemsErrors))
+                            true
+                        }
+                        .subscribeOn(Schedulers.io())
+                        .observeOn(AndroidSchedulers.mainThread())
+                        .subscribe { _, throwable ->
+                            if (throwable != null) {
+                                Log.e(TAG, "Error while storing result", throwable)
+                                handleError(throwable)
+                                return@subscribe
+                            }
+                            stopService()
+                        })
+            }
+        }
+
+    private val databaseConsumer: Consumer<List<Notification<Pair<Long, ChannelInfo>>>>
+        get() = Consumer {
+            feedDatabaseManager.database().runInTransaction {
+                for (notification in it) {
+
+                    if (notification.isOnNext) {
+                        val subscriptionId = notification.value!!.first
+                        val info = notification.value!!.second
+
+                        feedDatabaseManager.upsertAll(subscriptionId, info.relatedItems)
+                        subscriptionManager.updateFromInfo(subscriptionId, info)
+
+                        if (info.errors.isNotEmpty()) {
+                            feedResultsHolder.addErrors(RequestException.wrapList(info))
+                        }
+
+                    } else if (notification.isOnError) {
+                        feedResultsHolder.addError(notification.error!!)
+                    }
+                }
+            }
+        }
+
+    private val errorHandlingConsumer: Consumer<Notification<Pair<Long, ChannelInfo>>>
+        get() = Consumer {
+            if (it.isOnError) {
+                var error = it.error!!
+                if (error is RequestException) error = error.cause!!
+                val cause = error.cause
+
+                when {
+                    error is IOException -> throw error
+                    cause is IOException -> throw cause
+
+                    error is ReCaptchaException -> throw error
+                    cause is ReCaptchaException -> throw cause
+                }
+            }
+        }
+
+    private val notificationsConsumer: Consumer<Notification<Pair<Long, ChannelInfo>>>
+        get() = Consumer { onItemCompleted(it.value?.second?.name) }
+
+    private fun onItemCompleted(updateDescription: String?) {
+        currentProgress.incrementAndGet()
+        notificationUpdater.onNext(updateDescription ?: "")
+
+        broadcastProgress()
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Notification
+    ///////////////////////////////////////////////////////////////////////////
+
+    private lateinit var notificationManager: NotificationManagerCompat
+    private lateinit var notificationBuilder: NotificationCompat.Builder
+
+    private var currentProgress = AtomicInteger(-1)
+    private var maxProgress = AtomicInteger(-1)
+
+    private fun createNotification(): NotificationCompat.Builder {
+        return 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(R.string.feed_notification_loading))
+    }
+
+    private fun setupNotification() {
+        notificationManager = NotificationManagerCompat.from(this)
+        notificationBuilder = createNotification()
+
+        val throttleAfterFirstEmission = Function { flow: Flowable<String> ->
+            flow.limit(1).concatWith(flow.skip(1).throttleLatest(NOTIFICATION_SAMPLING_PERIOD.toLong(), TimeUnit.MILLISECONDS))
+        }
+
+        disposables.add(notificationUpdater
+                .publish(throttleAfterFirstEmission)
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe(this::updateNotificationProgress))
+    }
+
+    private fun updateNotificationProgress(updateDescription: String?) {
+        notificationBuilder.setProgress(maxProgress.get(), currentProgress.get(), maxProgress.get() == -1)
+
+        if (maxProgress.get() == -1) {
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) notificationBuilder.setContentInfo(null)
+            if (!updateDescription.isNullOrEmpty()) notificationBuilder.setContentText(updateDescription)
+            notificationBuilder.setContentText(updateDescription)
+        } else {
+            val progressText = this.currentProgress.toString() + "/" + maxProgress
+
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+                if (!updateDescription.isNullOrEmpty()) notificationBuilder.setContentText("$updateDescription  ($progressText)")
+            } else {
+                notificationBuilder.setContentInfo(progressText)
+                if (!updateDescription.isNullOrEmpty()) notificationBuilder.setContentText(updateDescription)
+            }
+        }
+
+        notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build())
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Error handling
+    ///////////////////////////////////////////////////////////////////////////
+
+    private fun handleError(error: Throwable) {
+        postEvent(ErrorResultEvent(error))
+        stopService()
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Results Holder
+    ///////////////////////////////////////////////////////////////////////////
+
+    class ResultsHolder {
+        /**
+         * The time the items have been loaded.
+         */
+        internal lateinit var lastUpdated: Calendar
+
+        /**
+         * List of errors that may have happen during loading.
+         */
+        internal lateinit var itemsErrors: List<Throwable>
+
+        private val itemsErrorsHolder: MutableList<Throwable> = ArrayList()
+
+        fun addError(error: Throwable) {
+            itemsErrorsHolder.add(error)
+        }
+
+        fun addErrors(errors: List<Throwable>) {
+            itemsErrorsHolder.addAll(errors)
+        }
+
+        fun ready() {
+            itemsErrors = itemsErrorsHolder.toList()
+            lastUpdated = Calendar.getInstance()
+        }
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/FeedGroupIcon.kt

@@ -0,0 +1,62 @@
+package org.schabi.newpipe.local.subscription
+
+import android.content.Context
+import androidx.annotation.AttrRes
+import androidx.annotation.DrawableRes
+import org.schabi.newpipe.R
+import org.schabi.newpipe.util.ThemeHelper
+
+enum class FeedGroupIcon(
+        /**
+         * The id that will be used to store and retrieve icons from some persistent storage (e.g. DB).
+         */
+        val id: Int,
+
+        /**
+         * The attribute that points to a drawable resource. "R.attr" is used here to support multiple themes.
+         */
+        @AttrRes val drawableResourceAttr: Int
+) {
+    ALL(0, R.attr.ic_asterisk),
+    MUSIC(1, R.attr.ic_music_note),
+    EDUCATION(2, R.attr.ic_school),
+    FITNESS(3, R.attr.ic_fitness),
+    SPACE(4, R.attr.ic_telescope),
+    COMPUTER(5, R.attr.ic_computer),
+    GAMING(6, R.attr.ic_videogame),
+    SPORTS(7, R.attr.ic_sports),
+    NEWS(8, R.attr.ic_megaphone),
+    FAVORITES(9, R.attr.ic_heart),
+    CAR(10, R.attr.ic_car),
+    MOTORCYCLE(11, R.attr.ic_motorcycle),
+    TREND(12, R.attr.ic_trending_up),
+    MOVIE(13, R.attr.ic_movie),
+    BACKUP(14, R.attr.ic_backup),
+    ART(15, R.attr.palette),
+    PERSON(16, R.attr.ic_person),
+    PEOPLE(17, R.attr.ic_people),
+    MONEY(18, R.attr.ic_money),
+    KIDS(19, R.attr.ic_kids),
+    FOOD(20, R.attr.ic_fastfood),
+    SMILE(21, R.attr.ic_smile),
+    EXPLORE(22, R.attr.ic_explore),
+    RESTAURANT(23, R.attr.ic_restaurant),
+    MIC(24, R.attr.ic_mic),
+    HEADSET(25, R.attr.audio),
+    RADIO(26, R.attr.ic_radio),
+    SHOPPING_CART(27, R.attr.ic_shopping_cart),
+    WATCH_LATER(28, R.attr.ic_watch_later),
+    WORK(29, R.attr.ic_work),
+    HOT(30, R.attr.ic_hot),
+    CHANNEL(31, R.attr.ic_channel),
+    BOOKMARK(32, R.attr.ic_bookmark),
+    PETS(33, R.attr.ic_pets),
+    WORLD(34, R.attr.ic_world),
+    STAR(35, R.attr.ic_stars),
+    SUN(36, R.attr.ic_sunny);
+
+    @DrawableRes
+    fun getDrawableRes(context: Context): Int {
+        return ThemeHelper.resolveResourceIdFromAttr(context, drawableResourceAttr)
+    }
+}

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

@@ -1,595 +0,0 @@
-package org.schabi.newpipe.local.subscription;
-
-import android.annotation.SuppressLint;
-import android.app.Activity;
-import android.app.AlertDialog;
-import android.content.BroadcastReceiver;
-import android.content.Context;
-import android.content.DialogInterface;
-import android.content.Intent;
-import android.content.IntentFilter;
-import android.content.SharedPreferences;
-import android.content.res.Configuration;
-import android.content.res.Resources;
-import android.graphics.Color;
-import android.graphics.PorterDuff;
-import android.os.Bundle;
-import android.os.Environment;
-import android.os.Parcelable;
-import android.preference.PreferenceManager;
-import androidx.annotation.DrawableRes;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.fragment.app.FragmentManager;
-import androidx.localbroadcastmanager.content.LocalBroadcastManager;
-import androidx.appcompat.app.ActionBar;
-import androidx.recyclerview.widget.GridLayoutManager;
-import androidx.recyclerview.widget.LinearLayoutManager;
-import androidx.recyclerview.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.local.subscription.services.SubscriptionsExportService;
-import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService;
-import org.schabi.newpipe.report.UserAction;
-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.ShareUtils;
-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.Date;
-import java.util.List;
-import java.util.Locale;
-
-import icepick.State;
-import io.reactivex.Observer;
-import io.reactivex.android.schedulers.AndroidSchedulers;
-import io.reactivex.disposables.CompositeDisposable;
-import io.reactivex.disposables.Disposable;
-import io.reactivex.schedulers.Schedulers;
-
-import static org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.KEY_MODE;
-import static org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.KEY_VALUE;
-import static org.schabi.newpipe.local.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>> implements SharedPreferences.OnSharedPreferenceChangeListener {
-    private static final int REQUEST_EXPORT_CODE = 666;
-    private static final int REQUEST_IMPORT_CODE = 667;
-
-    private RecyclerView itemsList;
-    @State
-    protected Parcelable itemsListState;
-    private InfoListAdapter infoListAdapter;
-    private int updateFlags = 0;
-
-    private static final int LIST_MODE_UPDATE_FLAG = 0x32;
-
-    private View whatsNewItemListHeader;
-    private View importExportListHeader;
-
-    @State
-    protected Parcelable importExportOptionsState;
-    private CollapsibleView importExportOptions;
-
-    private CompositeDisposable disposables = new CompositeDisposable();
-    private SubscriptionService subscriptionService;
-
-    ///////////////////////////////////////////////////////////////////////////
-    // Fragment LifeCycle
-    ///////////////////////////////////////////////////////////////////////////
-
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setHasOptionsMenu(true);
-        PreferenceManager.getDefaultSharedPreferences(activity)
-                .registerOnSharedPreferenceChangeListener(this);
-    }
-
-    @Override
-    public void setUserVisibleHint(boolean isVisibleToUser) {
-        super.setUserVisibleHint(isVisibleToUser);
-        if (activity != null && isVisibleToUser) {
-            setTitle(activity.getString(R.string.tab_subscriptions));
-        }
-    }
-
-    @Override
-    public void onAttach(Context context) {
-        super.onAttach(context);
-        infoListAdapter = new InfoListAdapter(activity);
-        subscriptionService = SubscriptionService.getInstance(activity);
-    }
-
-    @Override
-    public void onDetach() {
-        super.onDetach();
-    }
-
-    @Nullable
-    @Override
-    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();
-        if (updateFlags != 0) {
-            if ((updateFlags & LIST_MODE_UPDATE_FLAG) != 0) {
-                final boolean useGrid = isGridLayout();
-                itemsList.setLayoutManager(useGrid ? getGridLayoutManager() : getListLayoutManager());
-                infoListAdapter.setGridItemVariants(useGrid);
-                infoListAdapter.notifyDataSetChanged();
-            }
-            updateFlags = 0;
-        }
-    }
-
-    @Override
-    public void onPause() {
-        super.onPause();
-        itemsListState = itemsList.getLayoutManager().onSaveInstanceState();
-        importExportOptionsState = importExportOptions.onSaveInstanceState();
-
-        if (subscriptionBroadcastReceiver != null && activity != null) {
-            LocalBroadcastManager.getInstance(activity).unregisterReceiver(subscriptionBroadcastReceiver);
-        }
-    }
-
-    @Override
-    public void onDestroyView() {
-        if (disposables != null) disposables.clear();
-
-        super.onDestroyView();
-    }
-
-    @Override
-    public void onDestroy() {
-        if (disposables != null) disposables.dispose();
-        disposables = null;
-        subscriptionService = null;
-
-        PreferenceManager.getDefaultSharedPreferences(activity)
-                .unregisterOnSharedPreferenceChangeListener(this);
-        super.onDestroy();
-    }
-
-    protected RecyclerView.LayoutManager getListLayoutManager() {
-        return new LinearLayoutManager(activity);
-    }
-
-    protected RecyclerView.LayoutManager getGridLayoutManager() {
-        final Resources resources = activity.getResources();
-        int width = resources.getDimensionPixelSize(R.dimen.video_item_grid_thumbnail_image_width);
-        width += (24 * resources.getDisplayMetrics().density);
-        final int spanCount = (int) Math.floor(resources.getDisplayMetrics().widthPixels / (double)width);
-        final GridLayoutManager lm = new GridLayoutManager(activity, spanCount);
-        lm.setSpanSizeLookup(infoListAdapter.getSpanSizeLookup(spanCount));
-        return lm;
-    }
-
-    /*/////////////////////////////////////////////////////////////////////////
-    // 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) {
-        FragmentManager fragmentManager = getFM();
-        NavigationHelper.openSubscriptionsImportFragment(fragmentManager, 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) {
-        super.initViews(rootView, savedInstanceState);
-
-        final boolean useGrid = isGridLayout();
-        infoListAdapter = new InfoListAdapter(getActivity());
-        itemsList = rootView.findViewById(R.id.items_list);
-        itemsList.setLayoutManager(useGrid ? getGridLayoutManager() : getListLayoutManager());
-
-        View headerRootLayout;
-        infoListAdapter.setHeader(headerRootLayout = activity.getLayoutInflater().inflate(R.layout.subscription_header, itemsList, false));
-        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);
-        infoListAdapter.setGridItemVariants(useGrid);
-        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
-    protected void initListeners() {
-        super.initListeners();
-
-        infoListAdapter.setOnChannelSelectedListener(new OnClickGesture<ChannelInfoItem>() {
-
-            public void selected(ChannelInfoItem selectedItem) {
-                final FragmentManager fragmentManager = getFM();
-                NavigationHelper.openChannelFragment(fragmentManager,
-                        selectedItem.getServiceId(),
-                        selectedItem.getUrl(),
-                        selectedItem.getName());
-            }
-
-            public void held(ChannelInfoItem selectedItem) {
-                showLongTapDialog(selectedItem);
-            }
-
-        });
-
-        whatsNewItemListHeader.setOnClickListener(v -> {
-            FragmentManager fragmentManager = getFM();
-            NavigationHelper.openWhatsNewFragment(fragmentManager);
-        });
-        importExportListHeader.setOnClickListener(v -> importExportOptions.switchState());
-    }
-
-    private void showLongTapDialog(ChannelInfoItem selectedItem) {
-        final Context context = getContext();
-        final Activity activity = getActivity();
-        if (context == null || context.getResources() == null || getActivity() == null) return;
-
-        final String[] commands = new String[]{
-                context.getResources().getString(R.string.unsubscribe),
-                context.getResources().getString(R.string.share)
-        };
-
-        final DialogInterface.OnClickListener actions = (dialogInterface, i) -> {
-            switch (i) {
-                case 0:
-                    deleteChannel(selectedItem);
-                    break;
-                case 1:
-                    shareChannel(selectedItem);
-                    break;
-                default:
-                    break;
-            }
-        };
-
-        final View bannerView = View.inflate(activity, R.layout.dialog_title, null);
-        bannerView.setSelected(true);
-
-        TextView titleView = bannerView.findViewById(R.id.itemTitleView);
-        titleView.setText(selectedItem.getName());
-
-        TextView detailsView = bannerView.findViewById(R.id.itemAdditionalDetails);
-        detailsView.setVisibility(View.GONE);
-
-        new AlertDialog.Builder(activity)
-                .setCustomTitle(bannerView)
-                .setItems(commands, actions)
-                .create()
-                .show();
-
-    }
-
-    private void shareChannel(ChannelInfoItem selectedItem) {
-        ShareUtils.shareUrl(getContext(), selectedItem.getName(), selectedItem.getUrl());
-    }
-
-    @SuppressLint("CheckResult")
-    private void deleteChannel(ChannelInfoItem selectedItem) {
-        subscriptionService.subscriptionTable()
-                .getSubscription(selectedItem.getServiceId(), selectedItem.getUrl())
-                .toObservable()
-                .observeOn(Schedulers.io())
-                .subscribe(getDeleteObserver());
-
-        Toast.makeText(activity, getString(R.string.channel_unsubscribed), Toast.LENGTH_SHORT).show();
-    }
-
-
-
-    private Observer<List<SubscriptionEntity>> getDeleteObserver() {
-        return new Observer<List<SubscriptionEntity>>() {
-            @Override
-            public void onSubscribe(Disposable d) {
-                disposables.add(d);
-            }
-
-            @Override
-            public void onNext(List<SubscriptionEntity> subscriptionEntities) {
-                subscriptionService.subscriptionTable().delete(subscriptionEntities);
-            }
-
-            @Override
-            public void onError(Throwable exception) {
-                SubscriptionFragment.this.onError(exception);
-            }
-
-            @Override
-            public void onComplete() {  }
-        };
-    }
-
-    private void resetFragment() {
-        if (disposables != null) disposables.clear();
-        if (infoListAdapter != null) infoListAdapter.clearStreamItemList();
-    }
-
-    ///////////////////////////////////////////////////////////////////////////
-    // Subscriptions Loader
-    ///////////////////////////////////////////////////////////////////////////
-
-    @Override
-    public void startLoading(boolean forceLoad) {
-        super.startLoading(forceLoad);
-        resetFragment();
-
-        subscriptionService.getSubscription().toObservable()
-                .subscribeOn(Schedulers.io())
-                .observeOn(AndroidSchedulers.mainThread())
-                .subscribe(getSubscriptionObserver());
-    }
-
-    private Observer<List<SubscriptionEntity>> getSubscriptionObserver() {
-        return new Observer<List<SubscriptionEntity>>() {
-            @Override
-            public void onSubscribe(Disposable d) {
-                showLoading();
-                disposables.add(d);
-            }
-
-            @Override
-            public void onNext(List<SubscriptionEntity> subscriptions) {
-                handleResult(subscriptions);
-            }
-
-            @Override
-            public void onError(Throwable exception) {
-                SubscriptionFragment.this.onError(exception);
-            }
-
-            @Override
-            public void onComplete() {
-            }
-        };
-    }
-
-    @Override
-    public void handleResult(@NonNull List<SubscriptionEntity> result) {
-        super.handleResult(result);
-
-        infoListAdapter.clearStreamItemList();
-
-        if (result.isEmpty()) {
-            whatsNewItemListHeader.setVisibility(View.GONE);
-            showEmptyState();
-        } else {
-            infoListAdapter.addInfoItemList(getSubscriptionItems(result));
-            if (itemsListState != null) {
-                itemsList.getLayoutManager().onRestoreInstanceState(itemsListState);
-                itemsListState = null;
-            }
-            whatsNewItemListHeader.setVisibility(View.VISIBLE);
-            hideLoading();
-        }
-    }
-
-
-    private List<InfoItem> getSubscriptionItems(List<SubscriptionEntity> subscriptions) {
-        List<InfoItem> items = new ArrayList<>();
-        for (final SubscriptionEntity subscription : subscriptions) {
-            items.add(subscription.toChannelInfoItem());
-        }
-
-        Collections.sort(items,
-                (InfoItem o1, InfoItem o2) ->
-                        o1.getName().compareToIgnoreCase(o2.getName()));
-        return items;
-    }
-
-    /*//////////////////////////////////////////////////////////////////////////
-    // Contract
-    //////////////////////////////////////////////////////////////////////////*/
-
-    @Override
-    public void showLoading() {
-        super.showLoading();
-        animateView(itemsList, false, 100);
-    }
-
-    @Override
-    public void hideLoading() {
-        super.hideLoading();
-        animateView(itemsList, true, 200);
-    }
-
-    ///////////////////////////////////////////////////////////////////////////
-    // Fragment Error Handling
-    ///////////////////////////////////////////////////////////////////////////
-
-    @Override
-    protected boolean onError(Throwable exception) {
-        resetFragment();
-        if (super.onError(exception)) return true;
-
-        onUnrecoverableError(exception,
-                UserAction.SOMETHING_ELSE,
-                "none",
-                "Subscriptions",
-                R.string.general_error);
-        return true;
-    }
-
-    @Override
-    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
-        if (key.equals(getString(R.string.list_view_mode_key))) {
-            updateFlags |= LIST_MODE_UPDATE_FLAG;
-        }
-    }
-
-    protected boolean isGridLayout() {
-        final String list_mode = PreferenceManager.getDefaultSharedPreferences(activity).getString(getString(R.string.list_view_mode_key), getString(R.string.list_view_mode_value));
-        if ("auto".equals(list_mode)) {
-            final Configuration configuration = getResources().getConfiguration();
-            return configuration.orientation == Configuration.ORIENTATION_LANDSCAPE
-                    && configuration.isLayoutSizeAtLeast(Configuration.SCREENLAYOUT_SIZE_LARGE);
-        } else {
-            return "grid".equals(list_mode);
-        }
-    }
-}

app/src/main/java/org/schabi/newpipe/local/subscription/SubscriptionFragment.kt

@@ -0,0 +1,364 @@
+package org.schabi.newpipe.local.subscription
+
+import android.app.Activity
+import android.app.AlertDialog
+import android.content.*
+import android.os.Bundle
+import android.os.Environment
+import android.os.Parcelable
+import android.view.*
+import android.widget.Toast
+import androidx.lifecycle.ViewModelProviders
+import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.nononsenseapps.filepicker.Utils
+import com.xwray.groupie.Group
+import com.xwray.groupie.GroupAdapter
+import com.xwray.groupie.Item
+import com.xwray.groupie.Section
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import icepick.State
+import io.reactivex.disposables.CompositeDisposable
+import kotlinx.android.synthetic.main.dialog_title.view.*
+import kotlinx.android.synthetic.main.fragment_subscription.*
+import org.schabi.newpipe.R
+import org.schabi.newpipe.extractor.channel.ChannelInfoItem
+import org.schabi.newpipe.fragments.BaseStateFragment
+import org.schabi.newpipe.local.subscription.SubscriptionViewModel.*
+import org.schabi.newpipe.local.subscription.dialog.FeedGroupDialog
+import org.schabi.newpipe.local.subscription.item.*
+import org.schabi.newpipe.local.subscription.services.SubscriptionsExportService
+import org.schabi.newpipe.local.subscription.services.SubscriptionsExportService.EXPORT_COMPLETE_ACTION
+import org.schabi.newpipe.local.subscription.services.SubscriptionsExportService.KEY_FILE_PATH
+import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService
+import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.*
+import org.schabi.newpipe.report.UserAction
+import org.schabi.newpipe.util.AnimationUtils.animateView
+import org.schabi.newpipe.util.FilePickerActivityHelper
+import org.schabi.newpipe.util.NavigationHelper
+import org.schabi.newpipe.util.OnClickGesture
+import org.schabi.newpipe.util.ShareUtils
+import java.io.File
+import java.text.SimpleDateFormat
+import java.util.*
+
+class SubscriptionFragment : BaseStateFragment<SubscriptionState>() {
+    private lateinit var viewModel: SubscriptionViewModel
+    private lateinit var subscriptionManager: SubscriptionManager
+    private val disposables: CompositeDisposable = CompositeDisposable()
+
+    private var subscriptionBroadcastReceiver: BroadcastReceiver? = null
+
+    private val groupAdapter = GroupAdapter<ViewHolder>()
+    private val feedGroupsSection = Section()
+    private var feedGroupsCarousel: FeedGroupCarouselItem? = null
+    private lateinit var importExportItem: FeedImportExportItem
+    private val subscriptionsSection = Section()
+
+    @State @JvmField var itemsListState: Parcelable? = null
+    @State @JvmField var feedGroupsListState: Parcelable? = null
+    @State @JvmField var importExportItemExpandedState: Boolean = false
+
+    init {
+        setHasOptionsMenu(true)
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Fragment LifeCycle
+    ///////////////////////////////////////////////////////////////////////////
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setupInitialLayout()
+    }
+
+    override fun setUserVisibleHint(isVisibleToUser: Boolean) {
+        super.setUserVisibleHint(isVisibleToUser)
+        if (activity != null && isVisibleToUser) {
+            setTitle(activity.getString(R.string.tab_subscriptions))
+        }
+    }
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        subscriptionManager = SubscriptionManager(requireContext())
+    }
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        return inflater.inflate(R.layout.fragment_subscription, container, false)
+    }
+
+    override fun onResume() {
+        super.onResume()
+        setupBroadcastReceiver()
+    }
+
+    override fun onPause() {
+        super.onPause()
+        itemsListState = items_list.layoutManager?.onSaveInstanceState()
+        feedGroupsListState = feedGroupsCarousel?.onSaveInstanceState()
+        importExportItemExpandedState = importExportItem.isExpanded
+
+        if (subscriptionBroadcastReceiver != null && activity != null) {
+            LocalBroadcastManager.getInstance(activity).unregisterReceiver(subscriptionBroadcastReceiver!!)
+        }
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        disposables.dispose()
+    }
+
+    //////////////////////////////////////////////////////////////////////////
+    // Menu
+    //////////////////////////////////////////////////////////////////////////
+
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
+        super.onCreateOptionsMenu(menu, inflater)
+
+        val supportActionBar = activity.supportActionBar
+        if (supportActionBar != null) {
+            supportActionBar.setDisplayShowTitleEnabled(true)
+            setTitle(getString(R.string.tab_subscriptions))
+        }
+    }
+
+    private fun setupBroadcastReceiver() {
+        if (activity == null) return
+
+        if (subscriptionBroadcastReceiver != null) {
+            LocalBroadcastManager.getInstance(activity).unregisterReceiver(subscriptionBroadcastReceiver!!)
+        }
+
+        val filters = IntentFilter()
+        filters.addAction(EXPORT_COMPLETE_ACTION)
+        filters.addAction(IMPORT_COMPLETE_ACTION)
+        subscriptionBroadcastReceiver = object : BroadcastReceiver() {
+            override fun onReceive(context: Context, intent: Intent) {
+                items_list?.post {
+                    importExportItem.isExpanded = false
+                    importExportItem.notifyChanged(FeedImportExportItem.REFRESH_EXPANDED_STATUS)
+                }
+
+            }
+        }
+
+        LocalBroadcastManager.getInstance(activity).registerReceiver(subscriptionBroadcastReceiver!!, filters)
+    }
+
+    private fun onImportFromServiceSelected(serviceId: Int) {
+        val fragmentManager = fm
+        NavigationHelper.openSubscriptionsImportFragment(fragmentManager, serviceId)
+    }
+
+    private fun onImportPreviousSelected() {
+        startActivityForResult(FilePickerActivityHelper.chooseSingleFile(activity), REQUEST_IMPORT_CODE)
+    }
+
+    private fun onExportSelected() {
+        val date = SimpleDateFormat("yyyyMMddHHmm", Locale.ENGLISH).format(Date())
+        val exportName = "newpipe_subscriptions_$date.json"
+        val exportFile = File(Environment.getExternalStorageDirectory(), exportName)
+
+        startActivityForResult(FilePickerActivityHelper.chooseFileToSave(activity, exportFile.absolutePath), REQUEST_EXPORT_CODE)
+    }
+
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        if (data != null && data.data != null && resultCode == Activity.RESULT_OK) {
+            if (requestCode == REQUEST_EXPORT_CODE) {
+                val exportFile = Utils.getFileForUri(data.data!!)
+                if (!exportFile.parentFile.canWrite() || !exportFile.parentFile.canRead()) {
+                    Toast.makeText(activity, R.string.invalid_directory, Toast.LENGTH_SHORT).show()
+                } else {
+                    activity.startService(Intent(activity, SubscriptionsExportService::class.java)
+                            .putExtra(KEY_FILE_PATH, exportFile.absolutePath))
+                }
+            } else if (requestCode == REQUEST_IMPORT_CODE) {
+                val path = Utils.getFileForUri(data.data!!).absolutePath
+                ImportConfirmationDialog.show(this, Intent(activity, SubscriptionsImportService::class.java)
+                        .putExtra(KEY_MODE, PREVIOUS_EXPORT_MODE)
+                        .putExtra(KEY_VALUE, path))
+            }
+        }
+    }
+
+    //////////////////////////////////////////////////////////////////////////
+    // Fragment Views
+    //////////////////////////////////////////////////////////////////////////
+
+    private fun setupInitialLayout() {
+        Section().apply {
+            val carouselAdapter = GroupAdapter<ViewHolder>()
+
+            carouselAdapter.add(FeedGroupCardItem(-1, getString(R.string.all), FeedGroupIcon.ALL))
+            carouselAdapter.add(feedGroupsSection)
+            carouselAdapter.add(FeedGroupAddItem())
+
+            carouselAdapter.setOnItemClickListener { item, _ ->
+                listenerFeedGroups.selected(item)
+            }
+            carouselAdapter.setOnItemLongClickListener { item, _ ->
+                if (item is FeedGroupCardItem) {
+                    if (item.groupId == -1L) {
+                        return@setOnItemLongClickListener false
+                    }
+                }
+                listenerFeedGroups.held(item)
+                return@setOnItemLongClickListener true
+            }
+
+            feedGroupsCarousel = FeedGroupCarouselItem(requireContext(), carouselAdapter)
+            add(Section(HeaderItem(getString(R.string.fragment_whats_new)), listOf(feedGroupsCarousel)))
+
+            groupAdapter.add(this)
+        }
+
+        subscriptionsSection.setPlaceholder(EmptyPlaceholderItem())
+        subscriptionsSection.setHideWhenEmpty(true)
+
+        importExportItem = FeedImportExportItem(
+                { onImportPreviousSelected() },
+                { onImportFromServiceSelected(it) },
+                { onExportSelected() },
+                importExportItemExpandedState)
+        groupAdapter.add(Section(importExportItem, listOf(subscriptionsSection)))
+
+    }
+
+    override fun initViews(rootView: View, savedInstanceState: Bundle?) {
+        super.initViews(rootView, savedInstanceState)
+
+        items_list.layoutManager = LinearLayoutManager(requireContext())
+        items_list.adapter = groupAdapter
+
+        viewModel = ViewModelProviders.of(this).get(SubscriptionViewModel::class.java)
+        viewModel.stateLiveData.observe(viewLifecycleOwner, androidx.lifecycle.Observer { it?.let(this::handleResult) })
+        viewModel.feedGroupsLiveData.observe(viewLifecycleOwner, androidx.lifecycle.Observer { it?.let(this::handleFeedGroups) })
+    }
+
+    private fun showLongTapDialog(selectedItem: ChannelInfoItem) {
+        val commands = arrayOf(
+                getString(R.string.share),
+                getString(R.string.unsubscribe)
+        )
+
+        val actions = DialogInterface.OnClickListener { _, i ->
+            when (i) {
+                0 -> ShareUtils.shareUrl(requireContext(), selectedItem.name, selectedItem.url)
+                1 -> deleteChannel(selectedItem)
+            }
+        }
+
+        val bannerView = View.inflate(requireContext(), R.layout.dialog_title, null)
+        bannerView.isSelected = true
+        bannerView.itemTitleView.text = selectedItem.name
+        bannerView.itemAdditionalDetails.visibility = View.GONE
+
+        AlertDialog.Builder(requireContext())
+                .setCustomTitle(bannerView)
+                .setItems(commands, actions)
+                .create()
+                .show()
+    }
+
+    private fun deleteChannel(selectedItem: ChannelInfoItem) {
+        disposables.add(subscriptionManager.deleteSubscription(selectedItem.serviceId, selectedItem.url).subscribe {
+            Toast.makeText(requireContext(), getString(R.string.channel_unsubscribed), Toast.LENGTH_SHORT).show()
+        })
+    }
+
+    override fun doInitialLoadLogic() = Unit
+    override fun startLoading(forceLoad: Boolean) = Unit
+
+    private val listenerFeedGroups = object : OnClickGesture<Item<*>>() {
+        override fun selected(selectedItem: Item<*>?) {
+            when (selectedItem) {
+                is FeedGroupCardItem -> NavigationHelper.openFeedFragment(fm, selectedItem.groupId, selectedItem.name)
+                is FeedGroupAddItem -> FeedGroupDialog.newInstance().show(fm, null)
+            }
+        }
+
+        override fun held(selectedItem: Item<*>?) {
+            when (selectedItem) {
+                is FeedGroupCardItem -> FeedGroupDialog.newInstance(selectedItem.groupId).show(fm, null)
+            }
+        }
+    }
+
+    private val listenerChannelItem = object : OnClickGesture<ChannelInfoItem>() {
+        override fun selected(selectedItem: ChannelInfoItem) = NavigationHelper.openChannelFragment(fm,
+                selectedItem.serviceId, selectedItem.url, selectedItem.name)
+
+        override fun held(selectedItem: ChannelInfoItem) = showLongTapDialog(selectedItem)
+    }
+
+    override fun handleResult(result: SubscriptionState) {
+        super.handleResult(result)
+
+        when (result) {
+            is SubscriptionState.LoadedState -> {
+                result.subscriptions.forEach {
+                    if (it is ChannelItem) {
+                        it.gesturesListener = listenerChannelItem
+                    }
+                }
+
+                subscriptionsSection.update(result.subscriptions)
+                subscriptionsSection.setHideWhenEmpty(false)
+
+                if (itemsListState != null) {
+                    items_list.layoutManager?.onRestoreInstanceState(itemsListState)
+                    itemsListState = null
+                }
+            }
+            is SubscriptionState.ErrorState -> {
+                result.error?.let { onError(result.error) }
+            }
+        }
+    }
+
+    private fun handleFeedGroups(groups: List<Group>) {
+        feedGroupsSection.update(groups)
+
+        if (feedGroupsListState != null) {
+            feedGroupsCarousel?.onRestoreInstanceState(feedGroupsListState)
+            feedGroupsListState = null
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Contract
+    ///////////////////////////////////////////////////////////////////////////
+
+    override fun showLoading() {
+        super.showLoading()
+        animateView(items_list, false, 100)
+    }
+
+    override fun hideLoading() {
+        super.hideLoading()
+        animateView(items_list, true, 200)
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Fragment Error Handling
+    ///////////////////////////////////////////////////////////////////////////
+
+    override fun onError(exception: Throwable): Boolean {
+        if (super.onError(exception)) return true
+
+        onUnrecoverableError(exception, UserAction.SOMETHING_ELSE, "none", "Subscriptions", R.string.general_error)
+        return true
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Grid Mode
+    ///////////////////////////////////////////////////////////////////////////
+    // TODO: Re-implement grid mode selection
+
+    companion object {
+        private const val REQUEST_EXPORT_CODE = 666
+        private const val REQUEST_IMPORT_CODE = 667
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/SubscriptionManager.kt

@@ -0,0 +1,66 @@
+package org.schabi.newpipe.local.subscription
+
+import android.content.Context
+import io.reactivex.Completable
+import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.schedulers.Schedulers
+import org.schabi.newpipe.NewPipeDatabase
+import org.schabi.newpipe.database.subscription.SubscriptionDAO
+import org.schabi.newpipe.database.subscription.SubscriptionEntity
+import org.schabi.newpipe.extractor.channel.ChannelInfo
+import org.schabi.newpipe.local.feed.FeedDatabaseManager
+
+class SubscriptionManager(context: Context) {
+    private val database = NewPipeDatabase.getInstance(context)
+    private val subscriptionTable = database.subscriptionDAO()
+    private val feedDatabaseManager = FeedDatabaseManager(context)
+
+    fun subscriptionTable(): SubscriptionDAO = subscriptionTable
+    fun subscriptions() = subscriptionTable.all
+
+    fun upsertAll(infoList: List<ChannelInfo>): List<SubscriptionEntity> {
+        val listEntities = subscriptionTable.upsertAll(
+                infoList.map { SubscriptionEntity.from(it) })
+
+        database.runInTransaction {
+            infoList.forEachIndexed { index, info ->
+                feedDatabaseManager.upsertAll(listEntities[index].uid, info.relatedItems)
+            }
+        }
+
+        return listEntities
+    }
+
+    fun updateChannelInfo(info: ChannelInfo): Completable = subscriptionTable.getSubscription(info.serviceId, info.url)
+            .flatMapCompletable {
+                Completable.fromRunnable {
+                    it.setData(info.name, info.avatarUrl, info.description, info.subscriberCount)
+                    subscriptionTable.update(it)
+                    feedDatabaseManager.upsertAll(it.uid, info.relatedItems)
+                }
+            }
+
+    fun updateFromInfo(subscriptionId: Long, info: ChannelInfo) {
+        val subscriptionEntity = subscriptionTable.getSubscription(subscriptionId)
+        subscriptionEntity.setData(info.name, info.avatarUrl, info.description, info.subscriberCount)
+
+        subscriptionTable.update(subscriptionEntity)
+    }
+
+    fun deleteSubscription(serviceId: Int, url: String): Completable {
+        return Completable.fromCallable { subscriptionTable.deleteSubscription(serviceId, url) }
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+    }
+
+    fun insertSubscription(subscriptionEntity: SubscriptionEntity, info: ChannelInfo) {
+        database.runInTransaction {
+            val subscriptionId = subscriptionTable.insert(subscriptionEntity)
+            feedDatabaseManager.upsertAll(subscriptionId, info.relatedItems)
+        }
+    }
+
+    fun deleteSubscription(subscriptionEntity: SubscriptionEntity) {
+        subscriptionTable.delete(subscriptionEntity)
+    }
+}

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

@@ -1,162 +0,0 @@
-package org.schabi.newpipe.local.subscription;
-
-import android.content.Context;
-import androidx.annotation.NonNull;
-import android.util.Log;
-
-import org.schabi.newpipe.MainActivity;
-import org.schabi.newpipe.NewPipeDatabase;
-import org.schabi.newpipe.database.AppDatabase;
-import org.schabi.newpipe.database.subscription.SubscriptionDAO;
-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;
-import java.util.concurrent.TimeUnit;
-
-import io.reactivex.Completable;
-import io.reactivex.CompletableSource;
-import io.reactivex.Flowable;
-import io.reactivex.Maybe;
-import io.reactivex.Scheduler;
-import io.reactivex.functions.Function;
-import io.reactivex.schedulers.Schedulers;
-
-/**
- * Subscription Service singleton:
- * Provides a basis for channel Subscriptions.
- * Provides access to subscription table in database as well as
- * up-to-date observations on the subscribed channels
- */
-public class SubscriptionService {
-
-    private static volatile SubscriptionService instance;
-
-    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());
-    protected static final boolean DEBUG = MainActivity.DEBUG;
-    private static final int SUBSCRIPTION_DEBOUNCE_INTERVAL = 500;
-    private static final int SUBSCRIPTION_THREAD_POOL_SIZE = 4;
-
-    private final AppDatabase db;
-    private final Flowable<List<SubscriptionEntity>> subscription;
-
-    private final Scheduler subscriptionScheduler;
-
-    private SubscriptionService(Context context) {
-        db = NewPipeDatabase.getInstance(context.getApplicationContext());
-        subscription = getSubscriptionInfos();
-
-        final Executor subscriptionExecutor = Executors.newFixedThreadPool(SUBSCRIPTION_THREAD_POOL_SIZE);
-        subscriptionScheduler = Schedulers.from(subscriptionExecutor);
-    }
-
-    /**
-     * Part of subscription observation pipeline
-     *
-     * @see SubscriptionService#getSubscription()
-     */
-    private Flowable<List<SubscriptionEntity>> getSubscriptionInfos() {
-        return subscriptionTable().getAll()
-                // Wait for a period of infrequent updates and return the latest update
-                .debounce(SUBSCRIPTION_DEBOUNCE_INTERVAL, TimeUnit.MILLISECONDS)
-                .share()            // Share allows multiple subscribers on the same observable
-                .replay(1)          // Replay synchronizes subscribers to the last emitted result
-                .autoConnect();
-    }
-
-    /**
-     * Provides an observer to the latest update to the subscription table.
-     * <p>
-     * This observer may be subscribed multiple times, where each subscriber obtains
-     * the latest synchronized changes available, effectively share the same data
-     * across all subscribers.
-     * <p>
-     * This observer has a debounce cooldown, meaning if multiple updates are observed
-     * in the cooldown interval, only the latest changes are emitted to the subscribers.
-     * This reduces the amount of observations caused by frequent updates to the database.
-     */
-    @androidx.annotation.NonNull
-    public Flowable<List<SubscriptionEntity>> getSubscription() {
-        return subscription;
-    }
-
-    public Maybe<ChannelInfo> getChannelInfo(final SubscriptionEntity subscriptionEntity) {
-        if (DEBUG) Log.d(TAG, "getChannelInfo() called with: subscriptionEntity = [" + subscriptionEntity + "]");
-
-        return Maybe.fromSingle(ExtractorHelper
-                .getChannelInfo(subscriptionEntity.getServiceId(), subscriptionEntity.getUrl(), false))
-                .subscribeOn(subscriptionScheduler);
-    }
-
-    /**
-     * Returns the database access interface for subscription table.
-     */
-    public SubscriptionDAO subscriptionTable() {
-        return db.subscriptionDAO();
-    }
-
-    public Completable updateChannelInfo(final ChannelInfo info) {
-        final Function<List<SubscriptionEntity>, CompletableSource> update = new Function<List<SubscriptionEntity>, CompletableSource>() {
-            @Override
-            public CompletableSource apply(@NonNull List<SubscriptionEntity> subscriptionEntities) {
-                if (DEBUG) Log.d(TAG, "updateChannelInfo() called with: subscriptionEntities = [" + subscriptionEntities + "]");
-                if (subscriptionEntities.size() == 1) {
-                    SubscriptionEntity subscription = subscriptionEntities.get(0);
-
-                    // Subscriber count changes very often, making this check almost unnecessary.
-                    // Consider removing it later.
-                    if (!isSubscriptionUpToDate(info, subscription)) {
-                        subscription.setData(info.getName(), info.getAvatarUrl(), info.getDescription(), info.getSubscriberCount());
-
-                        return Completable.fromRunnable(() -> subscriptionTable().update(subscription));
-                    }
-                }
-
-                return Completable.complete();
-            }
-        };
-
-        return subscriptionTable().getSubscription(info.getServiceId(), info.getUrl())
-                .firstOrError()
-                .flatMapCompletable(update);
-    }
-
-    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) {
-        return equalsAndNotNull(info.getUrl(), entity.getUrl()) &&
-                info.getServiceId() == entity.getServiceId() &&
-                info.getName().equals(entity.getName()) &&
-                equalsAndNotNull(info.getAvatarUrl(), entity.getAvatarUrl()) &&
-                equalsAndNotNull(info.getDescription(), entity.getDescription()) &&
-                info.getSubscriberCount() == entity.getSubscriberCount();
-    }
-
-    private boolean equalsAndNotNull(final Object o1, final Object o2) {
-        return (o1 != null && o2 != null)
-                && o1.equals(o2);
-    }
-}

app/src/main/java/org/schabi/newpipe/local/subscription/SubscriptionViewModel.kt

@@ -0,0 +1,49 @@
+package org.schabi.newpipe.local.subscription
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.MutableLiveData
+import com.xwray.groupie.Group
+import io.reactivex.schedulers.Schedulers
+import org.schabi.newpipe.local.feed.FeedDatabaseManager
+import org.schabi.newpipe.local.subscription.item.ChannelItem
+import org.schabi.newpipe.local.subscription.item.FeedGroupCardItem
+import org.schabi.newpipe.util.DEFAULT_THROTTLE_TIMEOUT
+import java.util.concurrent.TimeUnit
+
+class SubscriptionViewModel(application: Application) : AndroidViewModel(application) {
+    val stateLiveData = MutableLiveData<SubscriptionState>()
+    val feedGroupsLiveData = MutableLiveData<List<Group>>()
+
+    private var feedDatabaseManager: FeedDatabaseManager = FeedDatabaseManager(application)
+    private var subscriptionManager = SubscriptionManager(application)
+
+    private var feedGroupItemsDisposable = feedDatabaseManager.groups()
+            .throttleLatest(DEFAULT_THROTTLE_TIMEOUT, TimeUnit.MILLISECONDS)
+            .map { it.map(::FeedGroupCardItem) }
+            .subscribeOn(Schedulers.io())
+            .subscribe(
+                    { feedGroupsLiveData.postValue(it) },
+                    { stateLiveData.postValue(SubscriptionState.ErrorState(it)) }
+            )
+
+    private var stateItemsDisposable = subscriptionManager.subscriptions()
+            .throttleLatest(DEFAULT_THROTTLE_TIMEOUT, TimeUnit.MILLISECONDS)
+            .map { it.map { entity -> ChannelItem(entity.toChannelInfoItem(), entity.uid, ChannelItem.ItemVersion.MINI) } }
+            .subscribeOn(Schedulers.io())
+            .subscribe(
+                    { stateLiveData.postValue(SubscriptionState.LoadedState(it)) },
+                    { stateLiveData.postValue(SubscriptionState.ErrorState(it)) }
+            )
+
+    override fun onCleared() {
+        super.onCleared()
+        stateItemsDisposable.dispose()
+        feedGroupItemsDisposable.dispose()
+    }
+
+    sealed class SubscriptionState {
+        data class LoadedState(val subscriptions: List<Group>) : SubscriptionState()
+        data class ErrorState(val error: Throwable? = null) : SubscriptionState()
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/decoration/FeedGroupCarouselDecoration.kt

@@ -0,0 +1,35 @@
+package org.schabi.newpipe.local.subscription.decoration
+
+import android.content.Context
+import android.graphics.Rect
+import android.view.View
+import androidx.recyclerview.widget.RecyclerView
+import org.schabi.newpipe.R
+
+class FeedGroupCarouselDecoration(context: Context) : RecyclerView.ItemDecoration() {
+
+    private val marginStartEnd: Int
+    private val marginTopBottom: Int
+    private val marginBetweenItems: Int
+
+    init {
+        with(context.resources) {
+            marginStartEnd = getDimensionPixelOffset(R.dimen.feed_group_carousel_start_end_margin)
+            marginTopBottom = getDimensionPixelOffset(R.dimen.feed_group_carousel_top_bottom_margin)
+            marginBetweenItems = getDimensionPixelOffset(R.dimen.feed_group_carousel_between_items_margin)
+        }
+    }
+
+    override fun getItemOffsets(outRect: Rect, child: View, parent: RecyclerView, state: RecyclerView.State) {
+        val childAdapterPosition = parent.getChildAdapterPosition(child)
+        val childAdapterCount = parent.adapter?.itemCount ?: 0
+
+        outRect.set(marginBetweenItems, marginTopBottom, 0, marginTopBottom)
+
+        if (childAdapterPosition == 0) {
+            outRect.left = marginStartEnd
+        } else if (childAdapterPosition == childAdapterCount - 1) {
+            outRect.right = marginStartEnd
+        }
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/dialog/FeedGroupDialog.kt

@@ -0,0 +1,355 @@
+package org.schabi.newpipe.local.subscription.dialog
+
+import android.app.Dialog
+import android.content.Context
+import android.os.Bundle
+import android.os.Parcelable
+import android.text.Editable
+import android.text.TextWatcher
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.view.inputmethod.InputMethodManager
+import android.widget.Toast
+import androidx.fragment.app.DialogFragment
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProviders
+import androidx.recyclerview.widget.GridLayoutManager
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.xwray.groupie.GroupAdapter
+import com.xwray.groupie.Section
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import icepick.Icepick
+import icepick.State
+import kotlinx.android.synthetic.main.dialog_feed_group_create.*
+import org.schabi.newpipe.R
+import org.schabi.newpipe.database.feed.model.FeedGroupEntity
+import org.schabi.newpipe.database.subscription.SubscriptionEntity
+import org.schabi.newpipe.local.subscription.FeedGroupIcon
+import org.schabi.newpipe.local.subscription.dialog.FeedGroupDialogViewModel.FeedDialogEvent
+import org.schabi.newpipe.local.subscription.item.EmptyPlaceholderItem
+import org.schabi.newpipe.local.subscription.item.HeaderTextSideItem
+import org.schabi.newpipe.local.subscription.item.PickerIconItem
+import org.schabi.newpipe.local.subscription.item.PickerSubscriptionItem
+import org.schabi.newpipe.util.AnimationUtils.animateView
+import org.schabi.newpipe.util.ThemeHelper
+import java.io.Serializable
+
+class FeedGroupDialog : DialogFragment() {
+    private lateinit var viewModel: FeedGroupDialogViewModel
+    private var groupId: Long = NO_GROUP_SELECTED
+    private var groupIcon: FeedGroupIcon? = null
+
+    sealed class ScreenState : Serializable {
+        object InitialScreen : ScreenState()
+        object SubscriptionsPicker : ScreenState()
+        object IconPickerList : ScreenState()
+    }
+
+    @State @JvmField var selectedIcon: FeedGroupIcon? = null
+    @State @JvmField var selectedSubscriptions: HashSet<Long> = HashSet()
+    @State @JvmField var currentScreen: ScreenState = ScreenState.InitialScreen
+
+    @State @JvmField var subscriptionsListState: Parcelable? = null
+    @State @JvmField var iconsListState: Parcelable? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        Icepick.restoreInstanceState(this, savedInstanceState)
+
+        setStyle(STYLE_NO_TITLE, ThemeHelper.getMinWidthDialogTheme(requireContext()))
+        groupId = arguments?.getLong(KEY_GROUP_ID, NO_GROUP_SELECTED) ?: NO_GROUP_SELECTED
+    }
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        return inflater.inflate(R.layout.dialog_feed_group_create, container)
+    }
+
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        return object : Dialog(requireActivity(), theme) {
+            override fun onBackPressed() {
+                if (currentScreen !is ScreenState.InitialScreen) {
+                    showInitialScreen()
+                } else {
+                    super.onBackPressed()
+                }
+            }
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+
+        iconsListState = icon_selector.layoutManager?.onSaveInstanceState()
+        subscriptionsListState = subscriptions_selector.layoutManager?.onSaveInstanceState()
+
+        Icepick.saveInstanceState(this, outState)
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        viewModel = ViewModelProviders.of(this, FeedGroupDialogViewModel.Factory(requireContext(), groupId))
+                .get(FeedGroupDialogViewModel::class.java)
+
+        viewModel.groupLiveData.observe(viewLifecycleOwner, Observer(::handleGroup))
+        viewModel.subscriptionsLiveData.observe(viewLifecycleOwner, Observer { setupSubscriptionPicker(it.first, it.second) })
+        viewModel.successLiveData.observe(viewLifecycleOwner, Observer {
+            when (it) {
+                is FeedDialogEvent.SuccessEvent -> dismiss()
+            }
+        })
+
+        setupIconPicker()
+
+        delete_button.setOnClickListener { viewModel.deleteGroup() }
+
+        cancel_button.setOnClickListener {
+            if (currentScreen !is ScreenState.InitialScreen) {
+                showInitialScreen()
+            } else {
+                dismiss()
+            }
+        }
+
+        group_name_input_container.error = null
+        group_name_input.addTextChangedListener(object : TextWatcher {
+            override fun afterTextChanged(s: Editable?) {}
+            override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
+
+            override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
+                if (group_name_input_container.isErrorEnabled && !s.isNullOrBlank()) {
+                    group_name_input_container.error = null
+                }
+            }
+        })
+
+        confirm_button.setOnClickListener {
+            if (currentScreen is ScreenState.InitialScreen) {
+                val name = group_name_input.text.toString().trim()
+                val icon = selectedIcon ?: groupIcon ?: FeedGroupIcon.ALL
+
+                if (name.isBlank()) {
+                    group_name_input_container.error = getString(R.string.feed_group_dialog_empty_name)
+                    group_name_input.text = null
+                    group_name_input.requestFocus()
+                    return@setOnClickListener
+                } else {
+                    group_name_input_container.error = null
+                }
+
+                if (selectedSubscriptions.isEmpty()) {
+                    Toast.makeText(requireContext(), getString(R.string.feed_group_dialog_empty_selection), Toast.LENGTH_SHORT).show()
+                    return@setOnClickListener
+                }
+
+                when (groupId) {
+                    NO_GROUP_SELECTED -> viewModel.createGroup(name, icon, selectedSubscriptions)
+                    else -> viewModel.updateGroup(name, icon, selectedSubscriptions)
+                }
+            } else {
+                showInitialScreen()
+            }
+        }
+
+        when (currentScreen) {
+            is ScreenState.InitialScreen -> showInitialScreen()
+            is ScreenState.IconPickerList -> showIconPicker()
+            is ScreenState.SubscriptionsPicker -> showSubscriptionsPicker()
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Setup
+    ///////////////////////////////////////////////////////////////////////////
+
+    private fun handleGroup(feedGroupEntity: FeedGroupEntity? = null) {
+        val icon = feedGroupEntity?.icon ?: FeedGroupIcon.ALL
+        val name = feedGroupEntity?.name ?: ""
+        groupIcon = feedGroupEntity?.icon
+
+        icon_preview.setImageResource((if (selectedIcon == null) icon else selectedIcon!!).getDrawableRes(requireContext()))
+
+        if (group_name_input.text.isNullOrBlank()) {
+            group_name_input.setText(name)
+        }
+    }
+
+    private fun setupSubscriptionPicker(subscriptions: List<SubscriptionEntity>, selectedSubscriptions: Set<Long>) {
+        this.selectedSubscriptions.addAll(selectedSubscriptions)
+        val useGridLayout = subscriptions.isNotEmpty()
+
+        val groupAdapter = GroupAdapter<ViewHolder>()
+        groupAdapter.spanCount = if (useGridLayout) 4 else 1
+
+        val selectedCountText = getString(R.string.feed_group_dialog_selection_count, this.selectedSubscriptions.size)
+        selected_subscription_count_view.text = selectedCountText
+
+        val headerInfoItem = HeaderTextSideItem(getString(R.string.tab_subscriptions), selectedCountText)
+        groupAdapter.add(headerInfoItem)
+
+        Section().apply {
+            addAll(subscriptions.map {
+                val isSelected = this@FeedGroupDialog.selectedSubscriptions.contains(it.uid)
+                PickerSubscriptionItem(it, isSelected)
+            })
+            setPlaceholder(EmptyPlaceholderItem())
+
+            groupAdapter.add(this)
+        }
+
+        subscriptions_selector.apply {
+            if (useGridLayout) {
+                layoutManager = GridLayoutManager(requireContext(), groupAdapter.spanCount, RecyclerView.VERTICAL, false).apply {
+                    spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
+                        override fun getSpanSize(position: Int) =
+                                if (position == 0) 4 else 1
+                    }
+                }
+            } else {
+                layoutManager = LinearLayoutManager(requireContext(), RecyclerView.VERTICAL, false)
+            }
+
+            adapter = groupAdapter
+
+            if (subscriptionsListState != null) {
+                layoutManager?.onRestoreInstanceState(subscriptionsListState)
+                subscriptionsListState = null
+            }
+        }
+
+        groupAdapter.setOnItemClickListener { item, _ ->
+            when (item) {
+                is PickerSubscriptionItem -> {
+                    val subscriptionId = item.subscriptionEntity.uid
+
+                    val isSelected = if (this.selectedSubscriptions.contains(subscriptionId)) {
+                        this.selectedSubscriptions.remove(subscriptionId)
+                        false
+                    } else {
+                        this.selectedSubscriptions.add(subscriptionId)
+                        true
+                    }
+
+                    item.isSelected = isSelected
+                    item.notifyChanged(PickerSubscriptionItem.UPDATE_SELECTED)
+
+                    val updateSelectedCountText = getString(R.string.feed_group_dialog_selection_count, this.selectedSubscriptions.size)
+                    selected_subscription_count_view.text = updateSelectedCountText
+                    headerInfoItem.infoText = updateSelectedCountText
+                    headerInfoItem.notifyChanged(HeaderTextSideItem.UPDATE_INFO)
+                }
+            }
+        }
+
+        select_channel_button.setOnClickListener {
+            subscriptions_selector.scrollToPosition(0)
+            showSubscriptionsPicker()
+        }
+    }
+
+    private fun setupIconPicker() {
+        val groupAdapter = GroupAdapter<ViewHolder>()
+        groupAdapter.addAll(FeedGroupIcon.values().map { PickerIconItem(requireContext(), it) })
+
+        icon_selector.apply {
+            layoutManager = GridLayoutManager(requireContext(), 7, RecyclerView.VERTICAL, false)
+            adapter = groupAdapter
+
+            if (iconsListState != null) {
+                layoutManager?.onRestoreInstanceState(iconsListState)
+                iconsListState = null
+            }
+        }
+
+        groupAdapter.setOnItemClickListener { item, _ ->
+            when (item) {
+                is PickerIconItem -> {
+                    selectedIcon = item.icon
+                    icon_preview.setImageResource(item.iconRes)
+
+                    showInitialScreen()
+                }
+            }
+        }
+        icon_preview.setOnClickListener {
+            icon_selector.scrollToPosition(0)
+            showIconPicker()
+        }
+
+        if (groupId == NO_GROUP_SELECTED) {
+            val icon = selectedIcon ?: FeedGroupIcon.ALL
+            icon_preview.setImageResource(icon.getDrawableRes(requireContext()))
+        }
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Screen Selector
+    ///////////////////////////////////////////////////////////////////////////
+
+    private fun showInitialScreen() {
+        currentScreen = ScreenState.InitialScreen
+        animateView(icon_selector, false, 0)
+        animateView(subscriptions_selector, false, 0)
+        animateView(options_root, true, 250)
+
+        separator.visibility = View.GONE
+        confirm_button.setText(if (groupId == NO_GROUP_SELECTED) R.string.create else android.R.string.ok)
+        delete_button.visibility = if (groupId == NO_GROUP_SELECTED) View.GONE else View.VISIBLE
+        cancel_button.visibility = View.VISIBLE
+    }
+
+    private fun showIconPicker() {
+        currentScreen = ScreenState.IconPickerList
+        animateView(icon_selector, true, 250)
+        animateView(subscriptions_selector, false, 0)
+        animateView(options_root, false, 0)
+
+        separator.visibility = View.VISIBLE
+        confirm_button.setText(android.R.string.ok)
+        delete_button.visibility = View.GONE
+        cancel_button.visibility = View.GONE
+
+        hideKeyboard()
+    }
+
+    private fun showSubscriptionsPicker() {
+        currentScreen = ScreenState.SubscriptionsPicker
+        animateView(icon_selector, false, 0)
+        animateView(subscriptions_selector, true, 250)
+        animateView(options_root, false, 0)
+
+        separator.visibility = View.VISIBLE
+        confirm_button.setText(android.R.string.ok)
+        delete_button.visibility = View.GONE
+        cancel_button.visibility = View.GONE
+
+        hideKeyboard()
+    }
+
+    ///////////////////////////////////////////////////////////////////////////
+    // Utils
+    ///////////////////////////////////////////////////////////////////////////
+
+    private fun hideKeyboard() {
+        val inputMethodManager = requireActivity().getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+        inputMethodManager.hideSoftInputFromWindow(group_name_input.windowToken, InputMethodManager.RESULT_UNCHANGED_SHOWN)
+        group_name_input.clearFocus()
+    }
+
+    companion object {
+        private const val KEY_GROUP_ID = "KEY_GROUP_ID"
+        private const val NO_GROUP_SELECTED = -1L
+
+        fun newInstance(groupId: Long = NO_GROUP_SELECTED): FeedGroupDialog {
+            val dialog = FeedGroupDialog()
+
+            dialog.arguments = Bundle().apply {
+                putLong(KEY_GROUP_ID, groupId)
+            }
+
+            return dialog
+        }
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/dialog/FeedGroupDialogViewModel.kt

@@ -0,0 +1,79 @@
+package org.schabi.newpipe.local.subscription.dialog
+
+import android.content.Context
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import io.reactivex.Flowable
+import io.reactivex.android.schedulers.AndroidSchedulers
+import io.reactivex.disposables.CompositeDisposable
+import io.reactivex.functions.BiFunction
+import io.reactivex.schedulers.Schedulers
+import org.schabi.newpipe.database.feed.model.FeedGroupEntity
+import org.schabi.newpipe.database.subscription.SubscriptionEntity
+import org.schabi.newpipe.local.feed.FeedDatabaseManager
+import org.schabi.newpipe.local.subscription.FeedGroupIcon
+import org.schabi.newpipe.local.subscription.SubscriptionManager
+
+
+class FeedGroupDialogViewModel(applicationContext: Context, val groupId: Long = -1) : ViewModel() {
+    class Factory(val context: Context, val groupId: Long = -1) : ViewModelProvider.Factory {
+        @Suppress("UNCHECKED_CAST")
+        override fun <T : ViewModel?> create(modelClass: Class<T>): T {
+            return FeedGroupDialogViewModel(context.applicationContext, groupId) as T
+        }
+    }
+
+    private var feedDatabaseManager: FeedDatabaseManager = FeedDatabaseManager(applicationContext)
+    private var subscriptionManager = SubscriptionManager(applicationContext)
+
+    val groupLiveData = MutableLiveData<FeedGroupEntity>()
+    val subscriptionsLiveData = MutableLiveData<Pair<List<SubscriptionEntity>, Set<Long>>>()
+    val successLiveData = MutableLiveData<FeedDialogEvent>()
+
+    private val disposables = CompositeDisposable()
+
+    private var feedGroupDisposable = feedDatabaseManager.getGroup(groupId)
+            .subscribeOn(Schedulers.io())
+            .subscribe(groupLiveData::postValue)
+
+    private var subscriptionsDisposable = Flowable
+            .combineLatest(subscriptionManager.subscriptions(), feedDatabaseManager.subscriptionIdsForGroup(groupId),
+                    BiFunction { t1: List<SubscriptionEntity>, t2: List<Long> -> t1 to t2.toSet() })
+            .subscribeOn(Schedulers.io())
+            .subscribe(subscriptionsLiveData::postValue)
+
+    override fun onCleared() {
+        super.onCleared()
+        subscriptionsDisposable.dispose()
+        feedGroupDisposable.dispose()
+        disposables.dispose()
+    }
+
+    fun createGroup(name: String, selectedIcon: FeedGroupIcon, selectedSubscriptions: Set<Long>) {
+        disposables.add(feedDatabaseManager.createGroup(name, selectedIcon)
+                .flatMapCompletable { feedDatabaseManager.updateSubscriptionsForGroup(it, selectedSubscriptions.toList()) }
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe { successLiveData.postValue(FeedDialogEvent.SuccessEvent) })
+    }
+
+    fun updateGroup(name: String, selectedIcon: FeedGroupIcon, selectedSubscriptions: Set<Long>) {
+        disposables.add(feedDatabaseManager.updateSubscriptionsForGroup(groupId, selectedSubscriptions.toList())
+                .andThen(feedDatabaseManager.updateGroup(FeedGroupEntity(groupId, name, selectedIcon)))
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe { successLiveData.postValue(FeedDialogEvent.SuccessEvent) })
+    }
+
+    fun deleteGroup() {
+        disposables.add(feedDatabaseManager.deleteGroup(groupId)
+                .subscribeOn(Schedulers.io())
+                .observeOn(AndroidSchedulers.mainThread())
+                .subscribe { successLiveData.postValue(FeedDialogEvent.SuccessEvent) })
+    }
+
+    sealed class FeedDialogEvent {
+        object SuccessEvent : FeedDialogEvent()
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/ChannelItem.kt

@@ -0,0 +1,65 @@
+package org.schabi.newpipe.local.subscription.item
+
+import android.content.Context
+import com.nostra13.universalimageloader.core.ImageLoader
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import kotlinx.android.synthetic.main.list_channel_item.*
+import org.schabi.newpipe.R
+import org.schabi.newpipe.extractor.channel.ChannelInfoItem
+import org.schabi.newpipe.util.ImageDisplayConstants
+import org.schabi.newpipe.util.Localization
+import org.schabi.newpipe.util.OnClickGesture
+
+
+class ChannelItem(
+        private val infoItem: ChannelInfoItem,
+        private val subscriptionId: Long = -1L,
+        private var itemVersion: ItemVersion = ItemVersion.NORMAL,
+        var gesturesListener: OnClickGesture<ChannelInfoItem>? = null
+) : Item() {
+
+    override fun getId(): Long = if (subscriptionId == -1L) super.getId() else subscriptionId
+
+    enum class ItemVersion { NORMAL, MINI, GRID }
+
+    override fun getLayout(): Int = when (itemVersion) {
+        ItemVersion.NORMAL -> R.layout.list_channel_item
+        ItemVersion.MINI -> R.layout.list_channel_mini_item
+        ItemVersion.GRID -> R.layout.list_channel_grid_item
+    }
+
+    override fun bind(viewHolder: ViewHolder, position: Int) {
+        viewHolder.itemTitleView.text = infoItem.name
+        viewHolder.itemAdditionalDetails.text = getDetailLine(viewHolder.root.context)
+        if (itemVersion == ItemVersion.NORMAL) viewHolder.itemChannelDescriptionView.text = infoItem.description
+
+        ImageLoader.getInstance().displayImage(infoItem.thumbnailUrl, viewHolder.itemThumbnailView,
+                ImageDisplayConstants.DISPLAY_THUMBNAIL_OPTIONS)
+
+        gesturesListener?.run {
+            viewHolder.containerView.setOnClickListener { selected(infoItem) }
+            viewHolder.containerView.setOnLongClickListener { held(infoItem); true }
+        }
+    }
+
+    private fun getDetailLine(context: Context): String {
+        var details = if (infoItem.subscriberCount >= 0) {
+            Localization.shortSubscriberCount(context, infoItem.subscriberCount)
+        } else {
+            context.getString(R.string.subscribers_count_not_available)
+        }
+
+        if (itemVersion == ItemVersion.NORMAL) {
+            if (infoItem.streamCount >= 0) {
+                val formattedVideoAmount = Localization.localizeStreamCount(context, infoItem.streamCount)
+                details = Localization.concatenateStrings(details, formattedVideoAmount)
+            }
+        }
+        return details
+    }
+
+    override fun getSpanSize(spanCount: Int, position: Int): Int {
+        return if (itemVersion == ItemVersion.GRID) 1 else spanCount
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/EmptyPlaceholderItem.kt

@@ -0,0 +1,10 @@
+package org.schabi.newpipe.local.subscription.item
+
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import org.schabi.newpipe.R
+
+class EmptyPlaceholderItem : Item() {
+    override fun getLayout(): Int = R.layout.list_empty_view
+    override fun bind(viewHolder: ViewHolder, position: Int) {}
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/FeedGroupAddItem.kt

@@ -0,0 +1,10 @@
+package org.schabi.newpipe.local.subscription.item
+
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import org.schabi.newpipe.R
+
+class FeedGroupAddItem : Item() {
+    override fun getLayout(): Int = R.layout.feed_group_add_new_item
+    override fun bind(viewHolder: ViewHolder, position: Int) {}
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/FeedGroupCardItem.kt

@@ -0,0 +1,27 @@
+package org.schabi.newpipe.local.subscription.item
+
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import kotlinx.android.synthetic.main.feed_group_card_item.*
+import org.schabi.newpipe.R
+import org.schabi.newpipe.database.feed.model.FeedGroupEntity
+import org.schabi.newpipe.local.subscription.FeedGroupIcon
+
+data class FeedGroupCardItem(
+        val groupId: Long = -1,
+        val name: String,
+        val icon: FeedGroupIcon
+) : Item() {
+    constructor (feedGroupEntity: FeedGroupEntity) : this(feedGroupEntity.uid, feedGroupEntity.name, feedGroupEntity.icon)
+
+    override fun getId(): Long {
+        return if (groupId == -1L) super.getId() else groupId
+    }
+
+    override fun getLayout(): Int = R.layout.feed_group_card_item
+
+    override fun bind(viewHolder: ViewHolder, position: Int) {
+        viewHolder.title.text = name
+        viewHolder.icon.setImageResource(icon.getDrawableRes(viewHolder.containerView.context))
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/FeedGroupCarouselItem.kt

@@ -0,0 +1,57 @@
+package org.schabi.newpipe.local.subscription.item
+
+import android.content.Context
+import android.os.Parcelable
+import android.view.View
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.xwray.groupie.GroupAdapter
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import kotlinx.android.synthetic.main.feed_item_carousel.*
+import org.schabi.newpipe.R
+import org.schabi.newpipe.local.subscription.decoration.FeedGroupCarouselDecoration
+
+class FeedGroupCarouselItem(context: Context, private val carouselAdapter: GroupAdapter<ViewHolder>) : Item() {
+    private val feedGroupCarouselDecoration = FeedGroupCarouselDecoration(context)
+
+    private var linearLayoutManager: LinearLayoutManager? = null
+    private var listState: Parcelable? = null
+
+    override fun getLayout() = R.layout.feed_item_carousel
+
+    fun onSaveInstanceState(): Parcelable? {
+        listState = linearLayoutManager?.onSaveInstanceState()
+        return listState
+    }
+
+    fun onRestoreInstanceState(state: Parcelable?) {
+        linearLayoutManager?.onRestoreInstanceState(state)
+        listState = state
+    }
+
+    override fun createViewHolder(itemView: View): ViewHolder {
+        val viewHolder = super.createViewHolder(itemView)
+
+        linearLayoutManager = LinearLayoutManager(itemView.context, RecyclerView.HORIZONTAL, false)
+
+        viewHolder.recycler_view.apply {
+            layoutManager = linearLayoutManager
+            adapter = carouselAdapter
+            addItemDecoration(feedGroupCarouselDecoration)
+        }
+
+        return viewHolder
+    }
+
+    override fun bind(viewHolder: ViewHolder, position: Int) {
+        viewHolder.recycler_view.apply { adapter = carouselAdapter }
+        linearLayoutManager?.onRestoreInstanceState(listState)
+    }
+
+    override fun unbind(viewHolder: ViewHolder) {
+        super.unbind(viewHolder)
+
+        listState = linearLayoutManager?.onSaveInstanceState()
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/FeedImportExportItem.kt

@@ -0,0 +1,116 @@
+package org.schabi.newpipe.local.subscription.item
+
+import android.graphics.Color
+import android.graphics.PorterDuff
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ImageView
+import android.widget.TextView
+import androidx.annotation.DrawableRes
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import kotlinx.android.synthetic.main.feed_import_export_group.*
+import org.schabi.newpipe.R
+import org.schabi.newpipe.extractor.NewPipe
+import org.schabi.newpipe.extractor.exceptions.ExtractionException
+import org.schabi.newpipe.util.AnimationUtils
+import org.schabi.newpipe.util.ServiceHelper
+import org.schabi.newpipe.util.ThemeHelper
+import org.schabi.newpipe.views.CollapsibleView
+
+class FeedImportExportItem(
+        val onImportPreviousSelected: () -> Unit,
+        val onImportFromServiceSelected: (Int) -> Unit,
+        val onExportSelected: () -> Unit,
+        var isExpanded: Boolean = false
+) : Item() {
+    companion object {
+        const val REFRESH_EXPANDED_STATUS = 123
+    }
+
+    override fun bind(viewHolder: ViewHolder, position: Int, payloads: MutableList<Any>) {
+        if (payloads.contains(REFRESH_EXPANDED_STATUS)) {
+            viewHolder.import_export_options.apply { if (isExpanded) expand() else collapse() }
+            return
+        }
+
+        super.bind(viewHolder, position, payloads)
+    }
+
+    override fun getLayout(): Int = R.layout.feed_import_export_group
+
+    override fun bind(viewHolder: ViewHolder, position: Int) {
+        if (viewHolder.import_from_options.childCount == 0) setupImportFromItems(viewHolder.import_from_options)
+        if (viewHolder.export_to_options.childCount == 0) setupExportToItems(viewHolder.export_to_options)
+
+        expandIconListener?.let { viewHolder.import_export_options.removeListener(it) }
+        expandIconListener = CollapsibleView.StateListener { newState ->
+            AnimationUtils.animateRotation(viewHolder.import_export_expand_icon,
+                    250, if (newState == CollapsibleView.COLLAPSED) 0 else 180)
+        }
+
+        viewHolder.import_export_options.currentState = if (isExpanded) CollapsibleView.EXPANDED else CollapsibleView.COLLAPSED
+        viewHolder.import_export_expand_icon.rotation = if (isExpanded) 180F else 0F
+        viewHolder.import_export_options.ready()
+
+        viewHolder.import_export_options.addListener(expandIconListener)
+        viewHolder.import_export.setOnClickListener {
+            viewHolder.import_export_options.switchState()
+            isExpanded = viewHolder.import_export_options.currentState == CollapsibleView.EXPANDED
+        }
+    }
+
+    override fun unbind(holder: ViewHolder) {
+        super.unbind(holder)
+        expandIconListener?.let { holder.import_export_options.removeListener(it) }
+        expandIconListener = null
+    }
+
+    private var expandIconListener: CollapsibleView.StateListener? = null
+
+    private fun addItemView(title: String, @DrawableRes icon: Int, container: ViewGroup): View {
+        val itemRoot = View.inflate(container.context, R.layout.subscription_import_export_item, null)
+        val titleView = itemRoot.findViewById<TextView>(android.R.id.text1)
+        val iconView = itemRoot.findViewById<ImageView>(android.R.id.icon1)
+
+        titleView.text = title
+        iconView.setImageResource(icon)
+
+        container.addView(itemRoot)
+        return itemRoot
+    }
+
+    private fun setupImportFromItems(listHolder: ViewGroup) {
+        val previousBackupItem = addItemView(listHolder.context.getString(R.string.previous_export),
+                ThemeHelper.resolveResourceIdFromAttr(listHolder.context, R.attr.ic_backup), listHolder)
+        previousBackupItem.setOnClickListener { onImportPreviousSelected() }
+
+        val iconColor = if (ThemeHelper.isLightThemeSelected(listHolder.context)) Color.BLACK else Color.WHITE
+        val services = listHolder.context.resources.getStringArray(R.array.service_list)
+        for (serviceName in services) {
+            try {
+                val service = NewPipe.getService(serviceName)
+
+                val subscriptionExtractor = service.subscriptionExtractor ?: continue
+
+                val supportedSources = subscriptionExtractor.supportedSources
+                if (supportedSources.isEmpty()) continue
+
+                val itemView = addItemView(serviceName, ServiceHelper.getIcon(service.serviceId), listHolder)
+                val iconView = itemView.findViewById<ImageView>(android.R.id.icon1)
+                iconView.setColorFilter(iconColor, PorterDuff.Mode.SRC_IN)
+
+                itemView.setOnClickListener { onImportFromServiceSelected(service.serviceId) }
+            } catch (e: ExtractionException) {
+                throw RuntimeException("Services array contains an entry that it's not a valid service name ($serviceName)", e)
+            }
+
+        }
+    }
+
+    private fun setupExportToItems(listHolder: ViewGroup) {
+        val previousBackupItem = addItemView(listHolder.context.getString(R.string.file),
+                ThemeHelper.resolveResourceIdFromAttr(listHolder.context, R.attr.ic_save), listHolder)
+        previousBackupItem.setOnClickListener { onExportSelected() }
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/HeaderItem.kt

@@ -0,0 +1,19 @@
+package org.schabi.newpipe.local.subscription.item
+
+import android.view.View.OnClickListener
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import kotlinx.android.synthetic.main.header_item.*
+import org.schabi.newpipe.R
+
+class HeaderItem(val title: String, private val onClickListener: (() -> Unit)? = null) : Item() {
+
+    override fun getLayout(): Int = R.layout.header_item
+
+    override fun bind(viewHolder: ViewHolder, position: Int) {
+        viewHolder.header_title.text = title
+
+        val listener: OnClickListener? = if (onClickListener != null) OnClickListener { onClickListener.invoke() } else null
+        viewHolder.root.setOnClickListener(listener)
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/HeaderTextSideItem.kt

@@ -0,0 +1,37 @@
+package org.schabi.newpipe.local.subscription.item
+
+import android.view.View.OnClickListener
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import kotlinx.android.synthetic.main.header_with_text_item.*
+import org.schabi.newpipe.R
+
+class HeaderTextSideItem(
+        val title: String,
+        var infoText: String? = null,
+        private val onClickListener: (() -> Unit)? = null
+) : Item() {
+
+    companion object {
+        const val UPDATE_INFO = 123
+    }
+
+    override fun getLayout(): Int = R.layout.header_with_text_item
+
+    override fun bind(viewHolder: ViewHolder, position: Int, payloads: MutableList<Any>) {
+        if (payloads.contains(UPDATE_INFO)) {
+            viewHolder.header_info.text = infoText
+            return
+        }
+
+        super.bind(viewHolder, position, payloads)
+    }
+
+    override fun bind(viewHolder: ViewHolder, position: Int) {
+        viewHolder.header_title.text = title
+        viewHolder.header_info.text = infoText
+
+        val listener: OnClickListener? = if (onClickListener != null) OnClickListener { onClickListener.invoke() } else null
+        viewHolder.root.setOnClickListener(listener)
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/PickerIconItem.kt

@@ -0,0 +1,19 @@
+package org.schabi.newpipe.local.subscription.item
+
+import android.content.Context
+import androidx.annotation.DrawableRes
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import kotlinx.android.synthetic.main.picker_icon_item.*
+import org.schabi.newpipe.R
+import org.schabi.newpipe.local.subscription.FeedGroupIcon
+
+class PickerIconItem(context: Context, val icon: FeedGroupIcon) : Item() {
+    @DrawableRes val iconRes: Int = icon.getDrawableRes(context)
+
+    override fun getLayout(): Int = R.layout.picker_icon_item
+
+    override fun bind(viewHolder: ViewHolder, position: Int) {
+        viewHolder.icon_view.setImageResource(iconRes)
+    }
+}

app/src/main/java/org/schabi/newpipe/local/subscription/item/PickerSubscriptionItem.kt

@@ -0,0 +1,51 @@
+package org.schabi.newpipe.local.subscription.item
+
+import android.view.View
+import com.nostra13.universalimageloader.core.DisplayImageOptions
+import com.nostra13.universalimageloader.core.ImageLoader
+import com.xwray.groupie.kotlinandroidextensions.Item
+import com.xwray.groupie.kotlinandroidextensions.ViewHolder
+import kotlinx.android.synthetic.main.picker_subscription_item.*
+import org.schabi.newpipe.R
+import org.schabi.newpipe.database.subscription.SubscriptionEntity
+import org.schabi.newpipe.util.AnimationUtils
+import org.schabi.newpipe.util.AnimationUtils.animateView
+import org.schabi.newpipe.util.ImageDisplayConstants
+
+data class PickerSubscriptionItem(val subscriptionEntity: SubscriptionEntity, var isSelected: Boolean = false) : Item() {
+    companion object {
+        const val UPDATE_SELECTED = 123
+
+        val IMAGE_LOADING_OPTIONS: DisplayImageOptions = ImageDisplayConstants.DISPLAY_AVATAR_OPTIONS
+    }
+
+    override fun getLayout(): Int = R.layout.picker_subscription_item
+
+    override fun bind(viewHolder: ViewHolder, position: Int, payloads: MutableList<Any>) {
+        if (payloads.contains(UPDATE_SELECTED)) {
+            animateView(viewHolder.selected_highlight, AnimationUtils.Type.LIGHT_SCALE_AND_ALPHA, isSelected, 150)
+            return
+        }
+
+        super.bind(viewHolder, position, payloads)
+    }
+
+    override fun bind(viewHolder: ViewHolder, position: Int) {
+        ImageLoader.getInstance().displayImage(subscriptionEntity.avatarUrl, viewHolder.thumbnail_view, IMAGE_LOADING_OPTIONS)
+
+        viewHolder.title_view.text = subscriptionEntity.name
+        viewHolder.selected_highlight.visibility = if (isSelected) View.VISIBLE else View.GONE
+    }
+
+    override fun unbind(viewHolder: ViewHolder) {
+        super.unbind(viewHolder)
+
+        viewHolder.selected_highlight.animate().setListener(null).cancel()
+        viewHolder.selected_highlight.visibility = View.GONE
+        viewHolder.selected_highlight.alpha = 1F
+    }
+
+    override fun getId(): Long {
+        return subscriptionEntity.uid
+    }
+}

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

@@ -34,10 +34,9 @@ import android.widget.Toast;
 import org.reactivestreams.Publisher;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.extractor.subscription.SubscriptionExtractor;
+import org.schabi.newpipe.local.subscription.SubscriptionManager;
 import org.schabi.newpipe.report.ErrorActivity;
 import org.schabi.newpipe.report.UserAction;
-import org.schabi.newpipe.local.subscription.ImportExportEventListener;
-import org.schabi.newpipe.local.subscription.SubscriptionService;
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
@@ -57,7 +56,7 @@ public abstract class BaseImportExportService extends Service {
     protected NotificationManagerCompat notificationManager;
     protected NotificationCompat.Builder notificationBuilder;
 
-    protected SubscriptionService subscriptionService;
+    protected SubscriptionManager subscriptionManager;
     protected final CompositeDisposable disposables = new CompositeDisposable();
     protected final PublishProcessor<String> notificationUpdater = PublishProcessor.create();
 
@@ -70,7 +69,7 @@ public abstract class BaseImportExportService extends Service {
     @Override
     public void onCreate() {
         super.onCreate();
-        subscriptionService = SubscriptionService.getInstance(this);
+        subscriptionManager = new SubscriptionManager(this);
         setupNotification();
     }
 

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

@@ -1,4 +1,4 @@
-package org.schabi.newpipe.local.subscription;
+package org.schabi.newpipe.local.subscription.services;
 
 public interface ImportExportEventListener {
     /**

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

@@ -17,7 +17,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-package org.schabi.newpipe.local.subscription;
+package org.schabi.newpipe.local.subscription.services;
 
 import androidx.annotation.Nullable;
 

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

@@ -29,7 +29,6 @@ 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.local.subscription.ImportExportJsonHelper;
 
 import java.io.File;
 import java.io.FileNotFoundException;
@@ -96,7 +95,7 @@ public class SubscriptionsExportService extends BaseImportExportService {
     private void startExport() {
         showToast(R.string.export_ongoing);
 
-        subscriptionService.subscriptionTable()
+        subscriptionManager.subscriptionTable()
                 .getAll()
                 .take(1)
                 .map(subscriptionEntities -> {

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

@@ -33,7 +33,6 @@ 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.local.subscription.ImportExportJsonHelper;
 import org.schabi.newpipe.util.Constants;
 import org.schabi.newpipe.util.ExtractorHelper;
 
@@ -180,6 +179,7 @@ public class SubscriptionsImportService extends BaseImportExportService {
 
                 .observeOn(Schedulers.io())
                 .doOnNext(getNotificationsConsumer())
+
                 .buffer(BUFFER_COUNT_BEFORE_INSERT)
                 .map(upsertBatch())
 
@@ -204,6 +204,7 @@ public class SubscriptionsImportService extends BaseImportExportService {
 
             @Override
             public void onError(Throwable error) {
+                Log.e(TAG, "Got an error!", error);
                 handleError(error);
             }
 
@@ -242,7 +243,7 @@ public class SubscriptionsImportService extends BaseImportExportService {
                 if (n.isOnNext()) infoList.add(n.getValue());
             }
 
-            return subscriptionService.upsertAll(infoList);
+            return subscriptionManager.upsertAll(infoList);
         };
     }
 

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

@@ -16,6 +16,7 @@ public enum UserAction {
     REQUESTED_PLAYLIST("requested playlist"),
     REQUESTED_KIOSK("requested kiosk"),
     REQUESTED_COMMENTS("requested comments"),
+    REQUESTED_FEED("requested feed"),
     DELETE_FROM_HISTORY("delete from history"),
     PLAY_STREAM("Play stream"),
     DOWNLOAD_POSTPROCESSING("download post-processing"),

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

@@ -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.local.subscription.SubscriptionManager;
 import org.schabi.newpipe.report.ErrorActivity;
 import org.schabi.newpipe.report.UserAction;
-import org.schabi.newpipe.local.subscription.SubscriptionService;
 
 import java.util.List;
 import java.util.Vector;
@@ -99,8 +99,8 @@ public class SelectChannelFragment extends DialogFragment {
         emptyView.setVisibility(View.GONE);
 
 
-        SubscriptionService subscriptionService = SubscriptionService.getInstance(getContext());
+        SubscriptionManager subscriptionManager = new SubscriptionManager(getContext());
-        subscriptionService.getSubscription().toObservable()
+        subscriptionManager.subscriptions().toObservable()
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(getSubscriptionObserver());

app/src/main/java/org/schabi/newpipe/util/ConstantsKt.kt

@@ -0,0 +1,6 @@
+package org.schabi.newpipe.util
+
+/**
+ * Default duration when using throttle functions across the app, in milliseconds.
+ */
+const val DEFAULT_THROTTLE_TIMEOUT = 120L

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

@@ -343,9 +343,13 @@ public class NavigationHelper {
                 .commit();
     }
 
-    public static void openWhatsNewFragment(FragmentManager fragmentManager) {
+    public static void openFeedFragment(FragmentManager fragmentManager) {
+        openFeedFragment(fragmentManager, -1, null);
+    }
+
+    public static void openFeedFragment(FragmentManager fragmentManager, long groupId, @Nullable String groupName) {
         defaultTransaction(fragmentManager)
-                .replace(R.id.fragment_holder, new FeedFragment())
+                .replace(R.id.fragment_holder, FeedFragment.newInstance(groupId, groupName))
                 .addToBackStack(null)
                 .commit();
     }

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

@@ -99,6 +99,17 @@ public class ThemeHelper {
         return isLightThemeSelected(context) ? R.style.LightDialogTheme : R.style.DarkDialogTheme;
     }
 
+    /**
+     * Return a min-width dialog theme styled according to the (default) selected theme.
+     *
+     * @param context context to get the selected theme
+     * @return the dialog style (the default one)
+     */
+    @StyleRes
+    public static int getMinWidthDialogTheme(Context context) {
+        return isLightThemeSelected(context) ? R.style.LightDialogMinWidthTheme : R.style.DarkDialogMinWidthTheme;
+    }
+
     /**
      * Return the selected theme styled according to the serviceId.
      *

app/src/main/res/drawable/dark_focused_selector.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_focused="true" android:drawable="@color/selected_background_color"/>
+    <item android:drawable="@color/transparent_background_color"/>
+</selector>

app/src/main/res/drawable/dashed_border_black.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <stroke
+        android:width="1dp"
+        android:color="@color/black_border_color"
+        android:dashGap="4dp"
+        android:dashWidth="4dp"/>
+</shape>

app/src/main/res/drawable/dashed_border_dark.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <stroke
+        android:width="1dp"
+        android:color="@color/dark_border_color"
+        android:dashGap="4dp"
+        android:dashWidth="4dp"/>
+</shape>

app/src/main/res/drawable/dashed_border_light.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <stroke
+        android:width="1dp"
+        android:color="@color/light_border_color"
+        android:dashGap="4dp"
+        android:dashWidth="4dp"/>
+</shape>

app/src/main/res/drawable/ic_asterisk_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M10,2H14L13.21,9.91L19.66,5.27L21.66,8.73L14.42,12L21.66,15.27L19.66,18.73L13.21,14.09L14,22H10L10.79,14.09L4.34,18.73L2.34,15.27L9.58,12L2.34,8.73L4.34,5.27L10.79,9.91L10,2Z"/>
+</vector>

app/src/main/res/drawable/ic_asterisk_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M10,2H14L13.21,9.91L19.66,5.27L21.66,8.73L14.42,12L21.66,15.27L19.66,18.73L13.21,14.09L14,22H10L10.79,14.09L4.34,18.73L2.34,15.27L9.58,12L2.34,8.73L4.34,5.27L10.79,9.91L10,2Z"/>
+</vector>

app/src/main/res/drawable/ic_car_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M18.92,6.01C18.72,5.42 18.16,5 17.5,5h-11c-0.66,0 -1.21,0.42 -1.42,1.01L3,12v8c0,0.55 0.45,1 1,1h1c0.55,0 1,-0.45 1,-1v-1h12v1c0,0.55 0.45,1 1,1h1c0.55,0 1,-0.45 1,-1v-8l-2.08,-5.99zM6.5,16c-0.83,0 -1.5,-0.67 -1.5,-1.5S5.67,13 6.5,13s1.5,0.67 1.5,1.5S7.33,16 6.5,16zM17.5,16c-0.83,0 -1.5,-0.67 -1.5,-1.5s0.67,-1.5 1.5,-1.5 1.5,0.67 1.5,1.5 -0.67,1.5 -1.5,1.5zM5,11l1.5,-4.5h11L19,11L5,11z"/>
+</vector>

app/src/main/res/drawable/ic_car_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M18.92,6.01C18.72,5.42 18.16,5 17.5,5h-11c-0.66,0 -1.21,0.42 -1.42,1.01L3,12v8c0,0.55 0.45,1 1,1h1c0.55,0 1,-0.45 1,-1v-1h12v1c0,0.55 0.45,1 1,1h1c0.55,0 1,-0.45 1,-1v-8l-2.08,-5.99zM6.5,16c-0.83,0 -1.5,-0.67 -1.5,-1.5S5.67,13 6.5,13s1.5,0.67 1.5,1.5S7.33,16 6.5,16zM17.5,16c-0.83,0 -1.5,-0.67 -1.5,-1.5s0.67,-1.5 1.5,-1.5 1.5,0.67 1.5,1.5 -0.67,1.5 -1.5,1.5zM5,11l1.5,-4.5h11L19,11L5,11z"/>
+</vector>

app/src/main/res/drawable/ic_computer_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M21,2L3,2c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h7v2L8,20v2h8v-2h-2v-2h7c1.1,0 2,-0.9 2,-2L23,4c0,-1.1 -0.9,-2 -2,-2zM21,16L3,16L3,4h18v12z"/>
+</vector>

app/src/main/res/drawable/ic_computer_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M21,2L3,2c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h7v2L8,20v2h8v-2h-2v-2h7c1.1,0 2,-0.9 2,-2L23,4c0,-1.1 -0.9,-2 -2,-2zM21,16L3,16L3,4h18v12z"/>
+</vector>

app/src/main/res/drawable/ic_edit_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z"/>
+</vector>

app/src/main/res/drawable/ic_edit_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M3,17.25V21h3.75L17.81,9.94l-3.75,-3.75L3,17.25zM20.71,7.04c0.39,-0.39 0.39,-1.02 0,-1.41l-2.34,-2.34c-0.39,-0.39 -1.02,-0.39 -1.41,0l-1.83,1.83 3.75,3.75 1.83,-1.83z"/>
+</vector>

app/src/main/res/drawable/ic_emoticon_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M11.99,2C6.47,2 2,6.48 2,12s4.47,10 9.99,10C17.52,22 22,17.52 22,12S17.52,2 11.99,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8zM15.5,11c0.83,0 1.5,-0.67 1.5,-1.5S16.33,8 15.5,8 14,8.67 14,9.5s0.67,1.5 1.5,1.5zM8.5,11c0.83,0 1.5,-0.67 1.5,-1.5S9.33,8 8.5,8 7,8.67 7,9.5 7.67,11 8.5,11zM12,17.5c2.33,0 4.31,-1.46 5.11,-3.5L6.89,14c0.8,2.04 2.78,3.5 5.11,3.5z"/>
+</vector>

app/src/main/res/drawable/ic_emoticon_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M11.99,2C6.47,2 2,6.48 2,12s4.47,10 9.99,10C17.52,22 22,17.52 22,12S17.52,2 11.99,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8zM15.5,11c0.83,0 1.5,-0.67 1.5,-1.5S16.33,8 15.5,8 14,8.67 14,9.5s0.67,1.5 1.5,1.5zM8.5,11c0.83,0 1.5,-0.67 1.5,-1.5S9.33,8 8.5,8 7,8.67 7,9.5 7.67,11 8.5,11zM12,17.5c2.33,0 4.31,-1.46 5.11,-3.5L6.89,14c0.8,2.04 2.78,3.5 5.11,3.5z"/>
+</vector>

app/src/main/res/drawable/ic_explore_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,10.9c-0.61,0 -1.1,0.49 -1.1,1.1s0.49,1.1 1.1,1.1c0.61,0 1.1,-0.49 1.1,-1.1s-0.49,-1.1 -1.1,-1.1zM12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM14.19,14.19L6,18l3.81,-8.19L18,6l-3.81,8.19z"/>
+</vector>

app/src/main/res/drawable/ic_explore_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,10.9c-0.61,0 -1.1,0.49 -1.1,1.1s0.49,1.1 1.1,1.1c0.61,0 1.1,-0.49 1.1,-1.1s-0.49,-1.1 -1.1,-1.1zM12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2zM14.19,14.19L6,18l3.81,-8.19L18,6l-3.81,8.19z"/>
+</vector>

app/src/main/res/drawable/ic_fastfood_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24"
+        android:viewportWidth="24">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M18.06,22.99h1.66c0.84,0 1.53,-0.64 1.63,-1.46L23,5.05h-5L18,1h-1.97v4.05h-4.97l0.3,2.34c1.71,0.47 3.31,1.32 4.27,2.26 1.44,1.42 2.43,2.89 2.43,5.29v8.05zM1,21.99L1,21h15.03v0.99c0,0.55 -0.45,1 -1.01,1L2.01,22.99c-0.56,0 -1.01,-0.45 -1.01,-1zM16.03,14.99c0,-8 -15.03,-8 -15.03,0h15.03zM1.02,17h15v2h-15z"/>
+</vector>

app/src/main/res/drawable/ic_fastfood_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24"
+        android:viewportWidth="24">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M18.06,22.99h1.66c0.84,0 1.53,-0.64 1.63,-1.46L23,5.05h-5L18,1h-1.97v4.05h-4.97l0.3,2.34c1.71,0.47 3.31,1.32 4.27,2.26 1.44,1.42 2.43,2.89 2.43,5.29v8.05zM1,21.99L1,21h15.03v0.99c0,0.55 -0.45,1 -1.01,1L2.01,22.99c-0.56,0 -1.01,-0.45 -1.01,-1zM16.03,14.99c0,-8 -15.03,-8 -15.03,0h15.03zM1.02,17h15v2h-15z"/>
+</vector>

app/src/main/res/drawable/ic_fitness_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M20.57,14.86L22,13.43 20.57,12 17,15.57 8.43,7 12,3.43 10.57,2 9.14,3.43 7.71,2 5.57,4.14 4.14,2.71 2.71,4.14l1.43,1.43L2,7.71l1.43,1.43L2,10.57 3.43,12 7,8.43 15.57,17 12,20.57 13.43,22l1.43,-1.43L16.29,22l2.14,-2.14 1.43,1.43 1.43,-1.43 -1.43,-1.43L22,16.29z"/>
+</vector>

app/src/main/res/drawable/ic_fitness_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M20.57,14.86L22,13.43 20.57,12 17,15.57 8.43,7 12,3.43 10.57,2 9.14,3.43 7.71,2 5.57,4.14 4.14,2.71 2.71,4.14l1.43,1.43L2,7.71l1.43,1.43L2,10.57 3.43,12 7,8.43 15.57,17 12,20.57 13.43,22l1.43,-1.43L16.29,22l2.14,-2.14 1.43,1.43 1.43,-1.43 -1.43,-1.43L22,16.29z"/>
+</vector>

app/src/main/res/drawable/ic_heart_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,21.35l-1.45,-1.32C5.4,15.36 2,12.28 2,8.5 2,5.42 4.42,3 7.5,3c1.74,0 3.41,0.81 4.5,2.09C13.09,3.81 14.76,3 16.5,3 19.58,3 22,5.42 22,8.5c0,3.78 -3.4,6.86 -8.55,11.54L12,21.35z"/>
+</vector>

app/src/main/res/drawable/ic_heart_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,21.35l-1.45,-1.32C5.4,15.36 2,12.28 2,8.5 2,5.42 4.42,3 7.5,3c1.74,0 3.41,0.81 4.5,2.09C13.09,3.81 14.76,3 16.5,3 19.58,3 22,5.42 22,8.5c0,3.78 -3.4,6.86 -8.55,11.54L12,21.35z"/>
+</vector>

app/src/main/res/drawable/ic_kids_black_24dp.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M14.5,10.5m-1.25,0a1.25,1.25 0,1 1,2.5 0a1.25,1.25 0,1 1,-2.5 0"/>
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M9.5,10.5m-1.25,0a1.25,1.25 0,1 1,2.5 0a1.25,1.25 0,1 1,-2.5 0"/>
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M22.94,12.66c0.04,-0.21 0.06,-0.43 0.06,-0.66s-0.02,-0.45 -0.06,-0.66c-0.25,-1.51 -1.36,-2.74 -2.81,-3.17 -0.53,-1.12 -1.28,-2.1 -2.19,-2.91C16.36,3.85 14.28,3 12,3s-4.36,0.85 -5.94,2.26c-0.92,0.81 -1.67,1.8 -2.19,2.91 -1.45,0.43 -2.56,1.65 -2.81,3.17 -0.04,0.21 -0.06,0.43 -0.06,0.66s0.02,0.45 0.06,0.66c0.25,1.51 1.36,2.74 2.81,3.17 0.52,1.11 1.27,2.09 2.17,2.89C7.62,20.14 9.71,21 12,21s4.38,-0.86 5.97,-2.28c0.9,-0.8 1.65,-1.79 2.17,-2.89 1.44,-0.43 2.55,-1.65 2.8,-3.17zM19,14c-0.1,0 -0.19,-0.02 -0.29,-0.03 -0.2,0.67 -0.49,1.29 -0.86,1.86C16.6,17.74 14.45,19 12,19s-4.6,-1.26 -5.85,-3.17c-0.37,-0.57 -0.66,-1.19 -0.86,-1.86 -0.1,0.01 -0.19,0.03 -0.29,0.03 -1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2c0.1,0 0.19,0.02 0.29,0.03 0.2,-0.67 0.49,-1.29 0.86,-1.86C7.4,6.26 9.55,5 12,5s4.6,1.26 5.85,3.17c0.37,0.57 0.66,1.19 0.86,1.86 0.1,-0.01 0.19,-0.03 0.29,-0.03 1.1,0 2,0.9 2,2s-0.9,2 -2,2zM7.5,14c0.76,1.77 2.49,3 4.5,3s3.74,-1.23 4.5,-3h-9z"/>
+</vector>

app/src/main/res/drawable/ic_kids_white_24dp.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M14.5,10.5m-1.25,0a1.25,1.25 0,1 1,2.5 0a1.25,1.25 0,1 1,-2.5 0"/>
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M9.5,10.5m-1.25,0a1.25,1.25 0,1 1,2.5 0a1.25,1.25 0,1 1,-2.5 0"/>
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M22.94,12.66c0.04,-0.21 0.06,-0.43 0.06,-0.66s-0.02,-0.45 -0.06,-0.66c-0.25,-1.51 -1.36,-2.74 -2.81,-3.17 -0.53,-1.12 -1.28,-2.1 -2.19,-2.91C16.36,3.85 14.28,3 12,3s-4.36,0.85 -5.94,2.26c-0.92,0.81 -1.67,1.8 -2.19,2.91 -1.45,0.43 -2.56,1.65 -2.81,3.17 -0.04,0.21 -0.06,0.43 -0.06,0.66s0.02,0.45 0.06,0.66c0.25,1.51 1.36,2.74 2.81,3.17 0.52,1.11 1.27,2.09 2.17,2.89C7.62,20.14 9.71,21 12,21s4.38,-0.86 5.97,-2.28c0.9,-0.8 1.65,-1.79 2.17,-2.89 1.44,-0.43 2.55,-1.65 2.8,-3.17zM19,14c-0.1,0 -0.19,-0.02 -0.29,-0.03 -0.2,0.67 -0.49,1.29 -0.86,1.86C16.6,17.74 14.45,19 12,19s-4.6,-1.26 -5.85,-3.17c-0.37,-0.57 -0.66,-1.19 -0.86,-1.86 -0.1,0.01 -0.19,0.03 -0.29,0.03 -1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2c0.1,0 0.19,0.02 0.29,0.03 0.2,-0.67 0.49,-1.29 0.86,-1.86C7.4,6.26 9.55,5 12,5s4.6,1.26 5.85,3.17c0.37,0.57 0.66,1.19 0.86,1.86 0.1,-0.01 0.19,-0.03 0.29,-0.03 1.1,0 2,0.9 2,2s-0.9,2 -2,2zM7.5,14c0.76,1.77 2.49,3 4.5,3s3.74,-1.23 4.5,-3h-9z"/>
+</vector>

app/src/main/res/drawable/ic_megaphone_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,8H4A2,2 0 0,0 2,10V14A2,2 0 0,0 4,16H5V20A1,1 0 0,0 6,21H8A1,1 0 0,0 9,20V16H12L17,20V4L12,8M21.5,12C21.5,13.71 20.54,15.26 19,16V8C20.53,8.75 21.5,10.3 21.5,12Z"/>
+</vector>

app/src/main/res/drawable/ic_megaphone_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,8H4A2,2 0 0,0 2,10V14A2,2 0 0,0 4,16H5V20A1,1 0 0,0 6,21H8A1,1 0 0,0 9,20V16H12L17,20V4L12,8M21.5,12C21.5,13.71 20.54,15.26 19,16V8C20.53,8.75 21.5,10.3 21.5,12Z"/>
+</vector>

app/src/main/res/drawable/ic_mic_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,14c1.66,0 2.99,-1.34 2.99,-3L15,5c0,-1.66 -1.34,-3 -3,-3S9,3.34 9,5v6c0,1.66 1.34,3 3,3zM17.3,11c0,3 -2.54,5.1 -5.3,5.1S6.7,14 6.7,11L5,11c0,3.41 2.72,6.23 6,6.72L11,21h2v-3.28c3.28,-0.48 6,-3.3 6,-6.72h-1.7z"/>
+</vector>

app/src/main/res/drawable/ic_mic_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,14c1.66,0 2.99,-1.34 2.99,-3L15,5c0,-1.66 -1.34,-3 -3,-3S9,3.34 9,5v6c0,1.66 1.34,3 3,3zM17.3,11c0,3 -2.54,5.1 -5.3,5.1S6.7,14 6.7,11L5,11c0,3.41 2.72,6.23 6,6.72L11,21h2v-3.28c3.28,-0.48 6,-3.3 6,-6.72h-1.7z"/>
+</vector>

app/src/main/res/drawable/ic_money_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M11.8,10.9c-2.27,-0.59 -3,-1.2 -3,-2.15 0,-1.09 1.01,-1.85 2.7,-1.85 1.78,0 2.44,0.85 2.5,2.1h2.21c-0.07,-1.72 -1.12,-3.3 -3.21,-3.81V3h-3v2.16c-1.94,0.42 -3.5,1.68 -3.5,3.61 0,2.31 1.91,3.46 4.7,4.13 2.5,0.6 3,1.48 3,2.41 0,0.69 -0.49,1.79 -2.7,1.79 -2.06,0 -2.87,-0.92 -2.98,-2.1h-2.2c0.12,2.19 1.76,3.42 3.68,3.83V21h3v-2.15c1.95,-0.37 3.5,-1.5 3.5,-3.55 0,-2.84 -2.43,-3.81 -4.7,-4.4z"/>
+</vector>

app/src/main/res/drawable/ic_money_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M11.8,10.9c-2.27,-0.59 -3,-1.2 -3,-2.15 0,-1.09 1.01,-1.85 2.7,-1.85 1.78,0 2.44,0.85 2.5,2.1h2.21c-0.07,-1.72 -1.12,-3.3 -3.21,-3.81V3h-3v2.16c-1.94,0.42 -3.5,1.68 -3.5,3.61 0,2.31 1.91,3.46 4.7,4.13 2.5,0.6 3,1.48 3,2.41 0,0.69 -0.49,1.79 -2.7,1.79 -2.06,0 -2.87,-0.92 -2.98,-2.1h-2.2c0.12,2.19 1.76,3.42 3.68,3.83V21h3v-2.15c1.95,-0.37 3.5,-1.5 3.5,-3.55 0,-2.84 -2.43,-3.81 -4.7,-4.4z"/>
+</vector>

app/src/main/res/drawable/ic_motorcycle_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M19.44,9.03L15.41,5H11v2h3.59l2,2H5c-2.8,0 -5,2.2 -5,5s2.2,5 5,5c2.46,0 4.45,-1.69 4.9,-4h1.65l2.77,-2.77c-0.21,0.54 -0.32,1.14 -0.32,1.77 0,2.8 2.2,5 5,5s5,-2.2 5,-5c0,-2.65 -1.97,-4.77 -4.56,-4.97zM7.82,15C7.4,16.15 6.28,17 5,17c-1.63,0 -3,-1.37 -3,-3s1.37,-3 3,-3c1.28,0 2.4,0.85 2.82,2H5v2h2.82zM19,17c-1.66,0 -3,-1.34 -3,-3s1.34,-3 3,-3 3,1.34 3,3 -1.34,3 -3,3z"/>
+</vector>

app/src/main/res/drawable/ic_motorcycle_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M19.44,9.03L15.41,5H11v2h3.59l2,2H5c-2.8,0 -5,2.2 -5,5s2.2,5 5,5c2.46,0 4.45,-1.69 4.9,-4h1.65l2.77,-2.77c-0.21,0.54 -0.32,1.14 -0.32,1.77 0,2.8 2.2,5 5,5s5,-2.2 5,-5c0,-2.65 -1.97,-4.77 -4.56,-4.97zM7.82,15C7.4,16.15 6.28,17 5,17c-1.63,0 -3,-1.37 -3,-3s1.37,-3 3,-3c1.28,0 2.4,0.85 2.82,2H5v2h2.82zM19,17c-1.66,0 -3,-1.34 -3,-3s1.34,-3 3,-3 3,1.34 3,3 -1.34,3 -3,3z"/>
+</vector>

app/src/main/res/drawable/ic_movie_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M18,4l2,4h-3l-2,-4h-2l2,4h-3l-2,-4H8l2,4H7L5,4H4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2V4h-4z"/>
+</vector>

app/src/main/res/drawable/ic_movie_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M18,4l2,4h-3l-2,-4h-2l2,4h-3l-2,-4H8l2,4H7L5,4H4c-1.1,0 -1.99,0.9 -1.99,2L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2V4h-4z"/>
+</vector>

app/src/main/res/drawable/ic_music_note_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,3v10.55c-0.59,-0.34 -1.27,-0.55 -2,-0.55 -2.21,0 -4,1.79 -4,4s1.79,4 4,4 4,-1.79 4,-4V7h4V3h-6z"/>
+</vector>

app/src/main/res/drawable/ic_music_note_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,3v10.55c-0.59,-0.34 -1.27,-0.55 -2,-0.55 -2.21,0 -4,1.79 -4,4s1.79,4 4,4 4,-1.79 4,-4V7h4V3h-6z"/>
+</vector>

app/src/main/res/drawable/ic_people_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M16,11c1.66,0 2.99,-1.34 2.99,-3S17.66,5 16,5c-1.66,0 -3,1.34 -3,3s1.34,3 3,3zM8,11c1.66,0 2.99,-1.34 2.99,-3S9.66,5 8,5C6.34,5 5,6.34 5,8s1.34,3 3,3zM8,13c-2.33,0 -7,1.17 -7,3.5L1,19h14v-2.5c0,-2.33 -4.67,-3.5 -7,-3.5zM16,13c-0.29,0 -0.62,0.02 -0.97,0.05 1.16,0.84 1.97,1.97 1.97,3.45L17,19h6v-2.5c0,-2.33 -4.67,-3.5 -7,-3.5z"/>
+</vector>

app/src/main/res/drawable/ic_people_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M16,11c1.66,0 2.99,-1.34 2.99,-3S17.66,5 16,5c-1.66,0 -3,1.34 -3,3s1.34,3 3,3zM8,11c1.66,0 2.99,-1.34 2.99,-3S9.66,5 8,5C6.34,5 5,6.34 5,8s1.34,3 3,3zM8,13c-2.33,0 -7,1.17 -7,3.5L1,19h14v-2.5c0,-2.33 -4.67,-3.5 -7,-3.5zM16,13c-0.29,0 -0.62,0.02 -0.97,0.05 1.16,0.84 1.97,1.97 1.97,3.45L17,19h6v-2.5c0,-2.33 -4.67,-3.5 -7,-3.5z"/>
+</vector>

app/src/main/res/drawable/ic_person_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M12,12c2.21,0 4,-1.79 4,-4s-1.79,-4 -4,-4 -4,1.79 -4,4 1.79,4 4,4zM12,14c-2.67,0 -8,1.34 -8,4v2h16v-2c0,-2.66 -5.33,-4 -8,-4z"/>
+</vector>

app/src/main/res/drawable/ic_person_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,12c2.21,0 4,-1.79 4,-4s-1.79,-4 -4,-4 -4,1.79 -4,4 1.79,4 4,4zM12,14c-2.67,0 -8,1.34 -8,4v2h16v-2c0,-2.66 -5.33,-4 -8,-4z"/>
+</vector>

app/src/main/res/drawable/ic_pets_black_24dp.xml

@@ -0,0 +1,21 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M4.5,9.5m-2.5,0a2.5,2.5 0,1 1,5 0a2.5,2.5 0,1 1,-5 0"/>
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M9,5.5m-2.5,0a2.5,2.5 0,1 1,5 0a2.5,2.5 0,1 1,-5 0"/>
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M15,5.5m-2.5,0a2.5,2.5 0,1 1,5 0a2.5,2.5 0,1 1,-5 0"/>
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M19.5,9.5m-2.5,0a2.5,2.5 0,1 1,5 0a2.5,2.5 0,1 1,-5 0"/>
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M17.34,14.86c-0.87,-1.02 -1.6,-1.89 -2.48,-2.91 -0.46,-0.54 -1.05,-1.08 -1.75,-1.32 -0.11,-0.04 -0.22,-0.07 -0.33,-0.09 -0.25,-0.04 -0.52,-0.04 -0.78,-0.04s-0.53,0 -0.79,0.05c-0.11,0.02 -0.22,0.05 -0.33,0.09 -0.7,0.24 -1.28,0.78 -1.75,1.32 -0.87,1.02 -1.6,1.89 -2.48,2.91 -1.31,1.31 -2.92,2.76 -2.62,4.79 0.29,1.02 1.02,2.03 2.33,2.32 0.73,0.15 3.06,-0.44 5.54,-0.44h0.18c2.48,0 4.81,0.58 5.54,0.44 1.31,-0.29 2.04,-1.31 2.33,-2.32 0.31,-2.04 -1.3,-3.49 -2.61,-4.8z"/>
+</vector>

app/src/main/res/drawable/ic_pets_white_24dp.xml

@@ -0,0 +1,21 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M4.5,9.5m-2.5,0a2.5,2.5 0,1 1,5 0a2.5,2.5 0,1 1,-5 0"/>
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M9,5.5m-2.5,0a2.5,2.5 0,1 1,5 0a2.5,2.5 0,1 1,-5 0"/>
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M15,5.5m-2.5,0a2.5,2.5 0,1 1,5 0a2.5,2.5 0,1 1,-5 0"/>
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M19.5,9.5m-2.5,0a2.5,2.5 0,1 1,5 0a2.5,2.5 0,1 1,-5 0"/>
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M17.34,14.86c-0.87,-1.02 -1.6,-1.89 -2.48,-2.91 -0.46,-0.54 -1.05,-1.08 -1.75,-1.32 -0.11,-0.04 -0.22,-0.07 -0.33,-0.09 -0.25,-0.04 -0.52,-0.04 -0.78,-0.04s-0.53,0 -0.79,0.05c-0.11,0.02 -0.22,0.05 -0.33,0.09 -0.7,0.24 -1.28,0.78 -1.75,1.32 -0.87,1.02 -1.6,1.89 -2.48,2.91 -1.31,1.31 -2.92,2.76 -2.62,4.79 0.29,1.02 1.02,2.03 2.33,2.32 0.73,0.15 3.06,-0.44 5.54,-0.44h0.18c2.48,0 4.81,0.58 5.54,0.44 1.31,-0.29 2.04,-1.31 2.33,-2.32 0.31,-2.04 -1.3,-3.49 -2.61,-4.8z"/>
+</vector>

app/src/main/res/drawable/ic_radio_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M3.24,6.15C2.51,6.43 2,7.17 2,8v12c0,1.1 0.89,2 2,2h16c1.11,0 2,-0.9 2,-2L22,8c0,-1.11 -0.89,-2 -2,-2L8.3,6l8.26,-3.34L15.88,1 3.24,6.15zM7,20c-1.66,0 -3,-1.34 -3,-3s1.34,-3 3,-3 3,1.34 3,3 -1.34,3 -3,3zM20,12h-2v-2h-2v2L4,12L4,8h16v4z"/>
+</vector>

app/src/main/res/drawable/ic_radio_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M3.24,6.15C2.51,6.43 2,7.17 2,8v12c0,1.1 0.89,2 2,2h16c1.11,0 2,-0.9 2,-2L22,8c0,-1.11 -0.89,-2 -2,-2L8.3,6l8.26,-3.34L15.88,1 3.24,6.15zM7,20c-1.66,0 -3,-1.34 -3,-3s1.34,-3 3,-3 3,1.34 3,3 -1.34,3 -3,3zM20,12h-2v-2h-2v2L4,12L4,8h16v4z"/>
+</vector>

app/src/main/res/drawable/ic_refresh_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M17.65,6.35C16.2,4.9 14.21,4 12,4c-4.42,0 -7.99,3.58 -7.99,8s3.57,8 7.99,8c3.73,0 6.84,-2.55 7.73,-6h-2.08c-0.82,2.33 -3.04,4 -5.65,4 -3.31,0 -6,-2.69 -6,-6s2.69,-6 6,-6c1.66,0 3.14,0.69 4.22,1.78L13,11h7V4l-2.35,2.35z"/>
+</vector>

app/src/main/res/drawable/ic_refresh_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M17.65,6.35C16.2,4.9 14.21,4 12,4c-4.42,0 -7.99,3.58 -7.99,8s3.57,8 7.99,8c3.73,0 6.84,-2.55 7.73,-6h-2.08c-0.82,2.33 -3.04,4 -5.65,4 -3.31,0 -6,-2.69 -6,-6s2.69,-6 6,-6c1.66,0 3.14,0.69 4.22,1.78L13,11h7V4l-2.35,2.35z"/>
+</vector>

app/src/main/res/drawable/ic_restaurant_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M11,9L9,9L9,2L7,2v7L5,9L5,2L3,2v7c0,2.12 1.66,3.84 3.75,3.97L6.75,22h2.5v-9.03C11.34,12.84 13,11.12 13,9L13,2h-2v7zM16,6v8h2.5v8L21,22L21,2c-2.76,0 -5,2.24 -5,4z"/>
+</vector>

app/src/main/res/drawable/ic_restaurant_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M11,9L9,9L9,2L7,2v7L5,9L5,2L3,2v7c0,2.12 1.66,3.84 3.75,3.97L6.75,22h2.5v-9.03C11.34,12.84 13,11.12 13,9L13,2h-2v7zM16,6v8h2.5v8L21,22L21,2c-2.76,0 -5,2.24 -5,4z"/>
+</vector>

app/src/main/res/drawable/ic_school_black_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M5,13.18v4L12,21l7,-3.82v-4L12,17l-7,-3.82zM12,3L1,9l11,6 9,-4.91V17h2V9L12,3z"/>
+</vector>

app/src/main/res/drawable/ic_school_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M5,13.18v4L12,21l7,-3.82v-4L12,17l-7,-3.82zM12,3L1,9l11,6 9,-4.91V17h2V9L12,3z"/>
+</vector>