Restore checkstyle and solve its errors

app/build.gradle

@@ -166,7 +166,7 @@ afterEvaluate {
     if (!System.properties.containsKey('skipFormatKtlint')) {
         preDebugBuild.dependsOn formatKtlint
     }
-    //preDebugBuild.dependsOn runCheckstyle, runKtlint
+    preDebugBuild.dependsOn runCheckstyle, runKtlint
 }
 
 sonarqube {

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

@@ -1,5 +1,16 @@
 package org.schabi.newpipe.fragments.detail;
 
+import static android.text.TextUtils.isEmpty;
+import static org.schabi.newpipe.extractor.StreamingService.ServiceInfo.MediaCapability.COMMENTS;
+import static org.schabi.newpipe.extractor.stream.StreamExtractor.NO_AGE_LIMIT;
+import static org.schabi.newpipe.ktx.ViewUtils.animate;
+import static org.schabi.newpipe.ktx.ViewUtils.animateRotation;
+import static org.schabi.newpipe.player.helper.PlayerHelper.globalScreenOrientationLocked;
+import static org.schabi.newpipe.player.helper.PlayerHelper.isClearingQueueConfirmationRequired;
+import static org.schabi.newpipe.player.playqueue.PlayQueueItem.RECOVERY_UNSET;
+import static org.schabi.newpipe.util.ExtractorHelper.showMetaInfoInTextView;
+import static org.schabi.newpipe.util.ListHelper.getUrlAndNonTorrentStreams;
+
 import android.animation.ValueAnimator;
 import android.app.Activity;
 import android.content.BroadcastReceiver;
@@ -43,7 +54,6 @@ import androidx.appcompat.widget.Toolbar;
 import androidx.coordinatorlayout.widget.CoordinatorLayout;
 import androidx.core.content.ContextCompat;
 import androidx.preference.PreferenceManager;
-import androidx.viewbinding.ViewBinding;
 
 import com.google.android.exoplayer2.PlaybackException;
 import com.google.android.exoplayer2.PlaybackParameters;
@@ -78,9 +88,9 @@ import org.schabi.newpipe.fragments.list.videos.RelatedItemsFragment;
 import org.schabi.newpipe.ktx.AnimationType;
 import org.schabi.newpipe.local.dialog.PlaylistDialog;
 import org.schabi.newpipe.local.history.HistoryRecordManager;
+import org.schabi.newpipe.player.Player;
 import org.schabi.newpipe.player.PlayerService;
 import org.schabi.newpipe.player.PlayerService.PlayerType;
-import org.schabi.newpipe.player.Player;
 import org.schabi.newpipe.player.event.OnKeyDownListener;
 import org.schabi.newpipe.player.event.PlayerServiceExtendedEventListener;
 import org.schabi.newpipe.player.helper.PlayerHelper;
@@ -118,17 +128,6 @@ import io.reactivex.rxjava3.disposables.CompositeDisposable;
 import io.reactivex.rxjava3.disposables.Disposable;
 import io.reactivex.rxjava3.schedulers.Schedulers;
 
-import static android.text.TextUtils.isEmpty;
-import static org.schabi.newpipe.extractor.StreamingService.ServiceInfo.MediaCapability.COMMENTS;
-import static org.schabi.newpipe.extractor.stream.StreamExtractor.NO_AGE_LIMIT;
-import static org.schabi.newpipe.ktx.ViewUtils.animate;
-import static org.schabi.newpipe.ktx.ViewUtils.animateRotation;
-import static org.schabi.newpipe.player.helper.PlayerHelper.globalScreenOrientationLocked;
-import static org.schabi.newpipe.player.helper.PlayerHelper.isClearingQueueConfirmationRequired;
-import static org.schabi.newpipe.player.playqueue.PlayQueueItem.RECOVERY_UNSET;
-import static org.schabi.newpipe.util.ExtractorHelper.showMetaInfoInTextView;
-import static org.schabi.newpipe.util.ListHelper.getUrlAndNonTorrentStreams;
-
 public final class VideoDetailFragment
         extends BaseStateFragment<StreamInfo>
         implements BackPressable,

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

@@ -239,6 +239,7 @@ public final class Player implements PlaybackListener, Listener {
     // UIs, listeners and disposables
     //////////////////////////////////////////////////////////////////////////*/
 
+    @SuppressWarnings("MemberName") // keep the unusual member name
     private final PlayerUiList UIs = new PlayerUiList();
 
     private BroadcastReceiver broadcastReceiver;
@@ -2301,6 +2302,7 @@ public final class Player implements PlaybackListener, Listener {
     /**
      * @return the user interfaces connected with the player
      */
+    @SuppressWarnings("MethodName") // keep the unusual method name
     public PlayerUiList UIs() {
         return UIs;
     }

app/src/main/java/org/schabi/newpipe/player/notification/NotificationUtil.java

@@ -132,7 +132,7 @@ public final class NotificationUtil {
 
         // also update content intent, in case the user switched players
         notificationBuilder.setContentIntent(PendingIntent.getActivity(player.getContext(),
-                NOTIFICATION_ID, getIntentForNotification(player), FLAG_UPDATE_CURRENT));
+                NOTIFICATION_ID, getIntentForNotification(), FLAG_UPDATE_CURRENT));
         notificationBuilder.setContentTitle(player.getVideoTitle());
         notificationBuilder.setContentText(player.getUploaderName());
         notificationBuilder.setTicker(player.getVideoTitle());
@@ -321,7 +321,7 @@ public final class NotificationUtil {
                         new Intent(intentAction), FLAG_UPDATE_CURRENT));
     }
 
-    private Intent getIntentForNotification(final Player player) {
+    private Intent getIntentForNotification() {
         if (player.audioPlayerSelected() || player.popupPlayerSelected()) {
             // Means we play in popup or audio only. Let's show the play queue
             return NavigationHelper.getPlayQueueActivityIntent(player.getContext());

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

@@ -10,8 +10,6 @@ import org.schabi.newpipe.player.mediasession.MediaSessionCallback;
 import org.schabi.newpipe.player.playqueue.PlayQueueItem;
 import org.schabi.newpipe.player.ui.VideoPlayerUi;
 
-import java.util.Optional;
-
 public class PlayerMediaSession implements MediaSessionCallback {
     private final Player player;
 

app/src/main/java/org/schabi/newpipe/player/ui/MainPlayerUi.java

@@ -497,7 +497,7 @@ public final class MainPlayerUi extends VideoPlayerUi implements View.OnLayoutCh
     //region Captions (text tracks)
 
     @Override
-    protected void setupSubtitleView(float captionScale) {
+    protected void setupSubtitleView(final float captionScale) {
         final DisplayMetrics metrics = context.getResources().getDisplayMetrics();
         final int minimumLength = Math.min(metrics.heightPixels, metrics.widthPixels);
         final float captionRatioInverse = 20f + 4f * (1.0f - captionScale);

app/src/main/java/org/schabi/newpipe/player/ui/PlayerUi.java

@@ -46,7 +46,7 @@ public abstract class PlayerUi {
 
 
     /**
-     * Called after the player received an intent and processed it
+     * Called after the player received an intent and processed it.
      */
     public void setupAfterIntent() {
     }
@@ -80,7 +80,7 @@ public abstract class PlayerUi {
 
     /**
      * Called when this UI is being discarded, either because the player is switching to a different
-     * UI or because the player is shutting down completely
+     * UI or because the player is shutting down completely.
      */
     public void destroy() {
     }
@@ -88,14 +88,14 @@ public abstract class PlayerUi {
     /**
      * Called when the player is smooth-stopping, that is, transitioning smoothly to a new play
      * queue after the user tapped on a new video stream while a stream was playing in the video
-     * detail fragment
+     * detail fragment.
      */
     public void smoothStopForImmediateReusing() {
     }
 
     /**
      * Called when the video detail fragment listener is connected with the player, or right after
-     * this UI is constructed if the listener is already connected then
+     * this UI is constructed if the listener is already connected then.
      */
     public void onFragmentListenerSet() {
     }
@@ -104,6 +104,7 @@ public abstract class PlayerUi {
      * Broadcasts that the player receives will also be notified to UIs here. If you want to
      * register new broadcast actions to receive here, add them to {@link
      * Player#setupBroadcastReceiver()}.
+     * @param intent the broadcast intent received by the player
      */
     public void onBroadcastReceived(final Intent intent) {
     }
@@ -154,12 +155,14 @@ public abstract class PlayerUi {
 
     /**
      * @see com.google.android.exoplayer2.Player.Listener#onTracksChanged(Tracks)
+     * @param currentTracks the available tracks information
      */
     public void onTextTracksChanged(@NonNull final Tracks currentTracks) {
     }
 
     /**
      * @see com.google.android.exoplayer2.Player.Listener#onPlaybackParametersChanged
+     * @param playbackParameters the new playback parameters
      */
     public void onPlaybackParametersChanged(@NonNull final PlaybackParameters playbackParameters) {
     }
@@ -172,12 +175,13 @@ public abstract class PlayerUi {
 
     /**
      * @see com.google.android.exoplayer2.text.TextOutput#onCues
+     * @param cues the cues to pass to the subtitle view
      */
     public void onCues(@NonNull final List<Cue> cues) {
     }
 
     /**
-     * Called when the stream being played changes
+     * Called when the stream being played changes.
      * @param info the {@link StreamInfo} metadata object, along with data about the selected and
      *             available video streams (to be used to build the resolution menus, for example)
      */
@@ -185,7 +189,7 @@ public abstract class PlayerUi {
     }
 
     /**
-     * Called when the thumbnail for the current metadata was loaded
+     * Called when the thumbnail for the current metadata was loaded.
      * @param bitmap the thumbnail to process, or null if there is no thumbnail or there was an
      *               error when loading the thumbnail
      */

app/src/main/java/org/schabi/newpipe/player/ui/PlayerUiList.java

@@ -35,7 +35,7 @@ public final class PlayerUiList {
     }
 
     /**
-     * Destroys all matching player UIs and removes them from the list
+     * Destroys all matching player UIs and removes them from the list.
      * @param playerUiType the class of the player UI to destroy; the {@link
      *                     Class#isInstance(Object)} method will be used, so even subclasses will be
      *                     destroyed and removed
@@ -67,7 +67,7 @@ public final class PlayerUiList {
     }
 
     /**
-     * Calls the provided consumer on all player UIs in the list
+     * Calls the provided consumer on all player UIs in the list.
      * @param consumer the consumer to call with player UIs
      */
     public void call(final Consumer<PlayerUi> consumer) {

app/src/main/java/org/schabi/newpipe/player/ui/VideoPlayerUi.java

@@ -86,7 +86,8 @@ import java.util.Optional;
 import java.util.stream.Collectors;
 
 public abstract class VideoPlayerUi extends PlayerUi
-        implements SeekBar.OnSeekBarChangeListener, View.OnClickListener, View.OnLongClickListener, PopupMenu.OnMenuItemClickListener, PopupMenu.OnDismissListener {
+        implements SeekBar.OnSeekBarChangeListener, View.OnClickListener, View.OnLongClickListener,
+        PopupMenu.OnMenuItemClickListener, PopupMenu.OnDismissListener {
     private static final String TAG = VideoPlayerUi.class.getSimpleName();
 
     // time constants
@@ -476,7 +477,7 @@ public abstract class VideoPlayerUi extends PlayerUi
         binding.endScreen.setImageBitmap(endScreenBitmap);
     }
 
-    protected abstract float calculateMaxEndScreenThumbnailHeight(@NonNull final Bitmap bitmap);
+    protected abstract float calculateMaxEndScreenThumbnailHeight(@NonNull Bitmap bitmap);
     //endregion
 
 
@@ -511,6 +512,7 @@ public abstract class VideoPlayerUi extends PlayerUi
 
     /**
      * Sets the current duration into the corresponding elements.
+     * @param currentProgress the current progress, in milliseconds
      */
     private void updatePlayBackElementsCurrentDuration(final int currentProgress) {
         // Don't set seekbar progress while user is seeking
@@ -522,6 +524,7 @@ public abstract class VideoPlayerUi extends PlayerUi
 
     /**
      * Sets the video duration time into all control components (e.g. seekbar).
+     * @param duration the video duration, in milliseconds
      */
     private void setVideoDurationToControls(final int duration) {
         binding.playbackEndTime.setText(getTimeString(duration));
@@ -1214,7 +1217,7 @@ public abstract class VideoPlayerUi extends PlayerUi
             final MediaItemTag.Quality quality = currentMetadata.getMaybeQuality().get();
             final List<VideoStream> availableStreams = quality.getSortedVideoStreams();
             final int selectedStreamIndex = quality.getSelectedVideoStreamIndex();
-            if (selectedStreamIndex == menuItemIndex|| availableStreams.size() <= menuItemIndex) {
+            if (selectedStreamIndex == menuItemIndex || availableStreams.size() <= menuItemIndex) {
                 return true;
             }
 
@@ -1320,7 +1323,7 @@ public abstract class VideoPlayerUi extends PlayerUi
     }
 
     @Override
-    public void onCues(@NonNull List<Cue> cues) {
+    public void onCues(@NonNull final List<Cue> cues) {
         super.onCues(cues);
         binding.subtitleView.setCues(cues);
     }
@@ -1332,7 +1335,7 @@ public abstract class VideoPlayerUi extends PlayerUi
         binding.subtitleView.setStyle(captionStyle);
     }
 
-    protected abstract void setupSubtitleView(final float captionScale);
+    protected abstract void setupSubtitleView(float captionScale);
     //endregion
 
 
@@ -1518,7 +1521,7 @@ public abstract class VideoPlayerUi extends PlayerUi
     }
 
     @Override
-    public void onVideoSizeChanged(@NonNull VideoSize videoSize) {
+    public void onVideoSizeChanged(@NonNull final VideoSize videoSize) {
         super.onVideoSizeChanged(videoSize);
         binding.surfaceView.setAspectRatio(((float) videoSize.width) / videoSize.height);
     }

app/src/main/java/org/schabi/newpipe/settings/custom/NotificationActionsPreference.java

@@ -28,7 +28,6 @@ import androidx.preference.PreferenceViewHolder;
 import org.schabi.newpipe.R;
 import org.schabi.newpipe.databinding.ListRadioIconItemBinding;
 import org.schabi.newpipe.databinding.SingleChoiceDialogViewBinding;
-import org.schabi.newpipe.player.PlayerService;
 import org.schabi.newpipe.player.notification.NotificationConstants;
 import org.schabi.newpipe.util.DeviceUtils;
 import org.schabi.newpipe.util.ThemeHelper;