Use ContextCompat.getSystemService() and the Context.getSystemService() extension function.

app/build.gradle

@@ -69,6 +69,10 @@ android {
         encoding 'utf-8'
     }
 
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_1_8
+    }
+
     // Required and used only by groupie
     androidExtensions {
         experimental = true
@@ -184,6 +188,7 @@ dependencies {
     implementation "androidx.recyclerview:recyclerview:1.1.0"
     implementation "androidx.cardview:cardview:1.0.0"
     implementation "androidx.constraintlayout:constraintlayout:1.1.3"
+    implementation 'androidx.core:core-ktx:1.3.1'
 
     implementation "androidx.lifecycle:lifecycle-livedata:${androidxLifecycleVersion}"
     implementation "androidx.lifecycle:lifecycle-viewmodel:${androidxLifecycleVersion}"

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

@@ -234,8 +234,7 @@ public class App extends Application {
         final NotificationChannel mChannel = new NotificationChannel(id, name, importance);
         mChannel.setDescription(description);
 
-        final NotificationManager mNotificationManager =
+        final NotificationManager mNotificationManager = getSystemService(NotificationManager.class);
-                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
         mNotificationManager.createNotificationChannel(mChannel);
 
         setUpUpdateNotificationChannel(importance);
@@ -260,7 +259,7 @@ public class App extends Application {
         appUpdateChannel.setDescription(appUpdateDescription);
 
         final NotificationManager appUpdateNotificationManager
-                = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
+                = getSystemService(NotificationManager.class);
         appUpdateNotificationManager.createNotificationChannel(appUpdateChannel);
     }
 

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

@@ -2,7 +2,6 @@ package org.schabi.newpipe;
 
 import android.app.Application;
 import android.app.PendingIntent;
-import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageInfo;
@@ -11,11 +10,12 @@ import android.content.pm.Signature;
 import android.net.ConnectivityManager;
 import android.net.Uri;
 import android.os.AsyncTask;
-import androidx.preference.PreferenceManager;
 import android.util.Log;
 
 import androidx.core.app.NotificationCompat;
 import androidx.core.app.NotificationManagerCompat;
+import androidx.core.content.ContextCompat;
+import androidx.preference.PreferenceManager;
 
 import com.grack.nanojson.JsonObject;
 import com.grack.nanojson.JsonParser;
@@ -213,8 +213,8 @@ public class CheckForNewAppVersionTask extends AsyncTask<Void, Void, String> {
     }
 
     private boolean isConnected() {
-        final ConnectivityManager cm =
+        final ConnectivityManager cm = ContextCompat.getSystemService(APP,
-                (ConnectivityManager) APP.getSystemService(Context.CONNECTIVITY_SERVICE);
+                ConnectivityManager.class);
         return cm.getActiveNetworkInfo() != null
                 && cm.getActiveNetworkInfo().isConnected();
     }

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

@@ -5,8 +5,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
-import androidx.core.text.HtmlCompat;
-import androidx.preference.PreferenceManager;
 import android.text.Editable;
 import android.text.Html;
 import android.text.TextUtils;
@@ -30,6 +28,9 @@ import androidx.annotation.Nullable;
 import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.widget.TooltipCompat;
+import androidx.core.content.ContextCompat;
+import androidx.core.text.HtmlCompat;
+import androidx.preference.PreferenceManager;
 import androidx.recyclerview.widget.ItemTouchHelper;
 import androidx.recyclerview.widget.RecyclerView;
 
@@ -49,9 +50,9 @@ import org.schabi.newpipe.fragments.list.BaseListFragment;
 import org.schabi.newpipe.local.history.HistoryRecordManager;
 import org.schabi.newpipe.report.ErrorActivity;
 import org.schabi.newpipe.report.UserAction;
-import org.schabi.newpipe.util.DeviceUtils;
 import org.schabi.newpipe.util.AnimationUtils;
 import org.schabi.newpipe.util.Constants;
+import org.schabi.newpipe.util.DeviceUtils;
 import org.schabi.newpipe.util.ExceptionUtils;
 import org.schabi.newpipe.util.ExtractorHelper;
 import org.schabi.newpipe.util.NavigationHelper;
@@ -639,8 +640,8 @@ public class SearchFragment extends BaseListFragment<SearchInfo, ListExtractor.I
         }
 
         if (searchEditText.requestFocus()) {
-            final InputMethodManager imm = (InputMethodManager) activity.getSystemService(
+            final InputMethodManager imm = ContextCompat.getSystemService(activity,
-                    Context.INPUT_METHOD_SERVICE);
+                    InputMethodManager.class);
             imm.showSoftInput(searchEditText, InputMethodManager.SHOW_FORCED);
         }
     }
@@ -653,8 +654,8 @@ public class SearchFragment extends BaseListFragment<SearchInfo, ListExtractor.I
             return;
         }
 
-        final InputMethodManager imm = (InputMethodManager) activity
+        final InputMethodManager imm = ContextCompat.getSystemService(activity,
-                .getSystemService(Context.INPUT_METHOD_SERVICE);
+                InputMethodManager.class);
         imm.hideSoftInputFromWindow(searchEditText.getWindowToken(),
                 InputMethodManager.RESULT_UNCHANGED_SHOWN);
 

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

@@ -1,7 +1,6 @@
 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
@@ -12,6 +11,7 @@ import android.view.View
 import android.view.ViewGroup
 import android.view.inputmethod.InputMethodManager
 import android.widget.Toast
+import androidx.core.content.getSystemService
 import androidx.fragment.app.DialogFragment
 import androidx.lifecycle.Observer
 import androidx.lifecycle.ViewModelProvider
@@ -459,7 +459,7 @@ class FeedGroupDialog : DialogFragment(), BackPressable {
     }
 
     private val inputMethodManager by lazy {
-        requireActivity().getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+        requireActivity().getSystemService<InputMethodManager>()!!
     }
 
     private fun showKeyboardSearch() {

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

@@ -30,6 +30,8 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.WindowManager;
 
+import androidx.core.content.ContextCompat;
+
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.util.ThemeHelper;
 
@@ -91,7 +93,7 @@ public final class MainPlayer extends Service {
             Log.d(TAG, "onCreate() called");
         }
         assureCorrectAppLanguage(this);
-        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
+        windowManager = ContextCompat.getSystemService(this, WindowManager.class);
 
         ThemeHelper.setTheme(this);
         createView();

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

@@ -58,6 +58,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.content.res.AppCompatResources;
+import androidx.core.content.ContextCompat;
 import androidx.core.view.DisplayCutoutCompat;
 import androidx.core.view.ViewCompat;
 import androidx.preference.PreferenceManager;
@@ -105,7 +106,6 @@ import org.schabi.newpipe.util.ShareUtils;
 
 import java.util.List;
 
-import static android.content.Context.WINDOW_SERVICE;
 import static org.schabi.newpipe.player.MainPlayer.ACTION_CLOSE;
 import static org.schabi.newpipe.player.MainPlayer.ACTION_FAST_FORWARD;
 import static org.schabi.newpipe.player.MainPlayer.ACTION_FAST_REWIND;
@@ -269,7 +269,7 @@ public class VideoPlayerImpl extends VideoPlayer
         super("MainPlayer" + TAG, service);
         this.service = service;
         this.shouldUpdateOnProgress = true;
-        this.windowManager = (WindowManager) service.getSystemService(WINDOW_SERVICE);
+        this.windowManager = ContextCompat.getSystemService(service, WindowManager.class);
         this.defaultPreferences = PreferenceManager.getDefaultSharedPreferences(service);
         this.resolver = new AudioPlaybackResolver(context, dataSource);
     }

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

@@ -12,6 +12,7 @@ import android.os.Build;
 import android.util.Log;
 
 import androidx.annotation.NonNull;
+import androidx.core.content.ContextCompat;
 
 import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.analytics.AnalyticsListener;
@@ -39,7 +40,7 @@ public class AudioReactor implements AudioManager.OnAudioFocusChangeListener, An
                         @NonNull final SimpleExoPlayer player) {
         this.player = player;
         this.context = context;
-        this.audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
+        this.audioManager = ContextCompat.getSystemService(context, AudioManager.class);
         player.addAnalyticsListener(this);
 
         if (SHOULD_BUILD_FOCUS_REQUEST) {

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

@@ -5,8 +5,7 @@ import android.net.wifi.WifiManager;
 import android.os.PowerManager;
 import android.util.Log;
 
-import static android.content.Context.POWER_SERVICE;
+import androidx.core.content.ContextCompat;
-import static android.content.Context.WIFI_SERVICE;
 
 public class LockManager {
     private final String TAG = "LockManager@" + hashCode();
@@ -18,10 +17,9 @@ public class LockManager {
     private WifiManager.WifiLock wifiLock;
 
     public LockManager(final Context context) {
-        powerManager = ((PowerManager) context.getApplicationContext()
+        powerManager = ContextCompat.getSystemService(context.getApplicationContext(),
-                .getSystemService(POWER_SERVICE));
+                PowerManager.class);
-        wifiManager = ((WifiManager) context.getApplicationContext()
+        wifiManager = ContextCompat.getSystemService(context, WifiManager.class);
-                .getSystemService(WIFI_SERVICE));
     }
 
     public void acquireWifiAndCpu() {

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

@@ -8,6 +8,7 @@ import android.view.accessibility.CaptioningManager;
 import androidx.annotation.IntDef;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.core.content.ContextCompat;
 import androidx.preference.PreferenceManager;
 
 import com.google.android.exoplayer2.SeekParameters;
@@ -312,8 +313,8 @@ public final class PlayerHelper {
 
     @NonNull
     public static CaptionStyleCompat getCaptionStyle(@NonNull final Context context) {
-        final CaptioningManager captioningManager = (CaptioningManager)
+        final CaptioningManager captioningManager = ContextCompat.getSystemService(context,
-                context.getSystemService(Context.CAPTIONING_SERVICE);
+                CaptioningManager.class);
         if (captioningManager == null || !captioningManager.isEnabled()) {
             return CaptionStyleCompat.DEFAULT;
         }
@@ -336,8 +337,8 @@ public final class PlayerHelper {
      * @return caption scaling
      */
     public static float getCaptionScale(@NonNull final Context context) {
-        final CaptioningManager captioningManager
+        final CaptioningManager captioningManager = ContextCompat.getSystemService(context,
-                = (CaptioningManager) context.getSystemService(Context.CAPTIONING_SERVICE);
+                CaptioningManager.class);
         if (captioningManager == null || !captioningManager.isEnabled()) {
             return 1.0f;
         }

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

@@ -9,10 +9,9 @@ import android.os.Build;
 import android.view.KeyEvent;
 
 import androidx.annotation.NonNull;
-import org.schabi.newpipe.App;
+import androidx.core.content.ContextCompat;
 
-import static android.content.Context.BATTERY_SERVICE;
+import org.schabi.newpipe.App;
-import static android.content.Context.UI_MODE_SERVICE;
 
 public final class DeviceUtils {
 
@@ -30,15 +29,14 @@ public final class DeviceUtils {
         final PackageManager pm = App.getApp().getPackageManager();
 
         // from doc: https://developer.android.com/training/tv/start/hardware.html#runtime-check
-        boolean isTv = ((UiModeManager) context.getSystemService(UI_MODE_SERVICE))
+        boolean isTv = ContextCompat.getSystemService(context, UiModeManager.class)
                 .getCurrentModeType() == Configuration.UI_MODE_TYPE_TELEVISION
                 || pm.hasSystemFeature(AMAZON_FEATURE_FIRE_TV)
                 || pm.hasSystemFeature(PackageManager.FEATURE_TELEVISION);
 
         // from https://stackoverflow.com/a/58932366
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-            final boolean isBatteryAbsent
+            final boolean isBatteryAbsent = context.getSystemService(BatteryManager.class)
-                    = ((BatteryManager) context.getSystemService(BATTERY_SERVICE))
                     .getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY) == 0;
             isTv = isTv || (isBatteryAbsent
                     && !pm.hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN)

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

@@ -3,6 +3,8 @@ package org.schabi.newpipe.util;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.net.ConnectivityManager;
+
+import androidx.core.content.ContextCompat;
 import androidx.preference.PreferenceManager;
 
 import androidx.annotation.Nullable;
@@ -543,7 +545,7 @@ public final class ListHelper {
      */
     public static boolean isMeteredNetwork(final Context context) {
         final ConnectivityManager manager
-                = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
+                = ContextCompat.getSystemService(context, ConnectivityManager.class);
         if (manager == null || manager.getActiveNetworkInfo() == null) {
             return false;
         }

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

@@ -9,6 +9,8 @@ import android.content.pm.ResolveInfo;
 import android.net.Uri;
 import android.widget.Toast;
 
+import androidx.core.content.ContextCompat;
+
 import org.schabi.newpipe.R;
 
 public final class ShareUtils {
@@ -95,7 +97,7 @@ public final class ShareUtils {
      */
     public static void copyToClipboard(final Context context, final String text) {
         final ClipboardManager clipboardManager =
-                (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+                ContextCompat.getSystemService(context, ClipboardManager.class);
 
         if (clipboardManager == null) {
             Toast.makeText(context,

app/src/main/java/us/shandian/giga/service/DownloadManagerService.java

@@ -24,6 +24,8 @@ import android.os.Handler.Callback;
 import android.os.IBinder;
 import android.os.Message;
 import android.os.Parcelable;
+
+import androidx.core.content.ContextCompat;
 import androidx.preference.PreferenceManager;
 import android.util.Log;
 import android.util.SparseArray;
@@ -157,8 +159,10 @@ public class DownloadManagerService extends Service {
 
         mNotification = builder.build();
 
-        mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
+        mNotificationManager = ContextCompat.getSystemService(this,
-        mConnectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
+                NotificationManager.class);
+        mConnectivityManager = ContextCompat.getSystemService(this,
+                ConnectivityManager.class);
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
             mNetworkStateListenerL = new ConnectivityManager.NetworkCallback() {

app/src/main/java/us/shandian/giga/ui/adapter/MissionAdapter.java

@@ -29,6 +29,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.StringRes;
 import androidx.appcompat.app.AlertDialog;
+import androidx.core.content.ContextCompat;
 import androidx.core.content.FileProvider;
 import androidx.core.view.ViewCompat;
 import androidx.recyclerview.widget.DiffUtil;
@@ -120,7 +121,7 @@ public class MissionAdapter extends Adapter<ViewHolder> implements Handler.Callb
         mContext = context;
         mDownloadManager = downloadManager;
 
-        mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+        mInflater = ContextCompat.getSystemService(mContext, LayoutInflater.class);
         mLayout = R.layout.mission_item;
 
         mHandler = new Handler(context.getMainLooper());

app/src/main/java/us/shandian/giga/util/Utility.java

@@ -201,7 +201,7 @@ public class Utility {
     }
 
     public static void copyToClipboard(Context context, String str) {
-        ClipboardManager cm = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+        ClipboardManager cm = ContextCompat.getSystemService(context, ClipboardManager.class);
 
         if (cm == null) {
             Toast.makeText(context, R.string.permission_denied, Toast.LENGTH_LONG).show();

checkstyle-suppressions.xml

@@ -13,7 +13,11 @@
 
   <suppress checks="FinalParameters"
       files="ListHelper.java"
-      lines="280,312"/>
+      lines="282,314"/>
+
+  <suppress checks="LineLength"
+      files="App.java"
+      lines="237"/>
 
   <!-- org.schabi.newpipe.streams -->
   <suppress checks="LineLength"