PlayerHolder refactor

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

@@ -95,7 +95,8 @@
 import org.schabi.newpipe.player.PlayerService;
 import org.schabi.newpipe.player.PlayerType;
 import org.schabi.newpipe.player.event.OnKeyDownListener;
-import org.schabi.newpipe.player.event.PlayerServiceExtendedEventListener;
+import org.schabi.newpipe.player.event.PlayerHolderLifecycleEventListener;
+import org.schabi.newpipe.player.event.PlayerServiceEventListener;
 import org.schabi.newpipe.player.helper.PlayerHelper;
 import org.schabi.newpipe.player.helper.PlayerHolder;
 import org.schabi.newpipe.player.playqueue.PlayQueue;
@@ -136,7 +137,8 @@
 public final class VideoDetailFragment
         extends BaseStateFragment<StreamInfo>
         implements BackPressable,
-        PlayerServiceExtendedEventListener,
+        PlayerServiceEventListener,
+        PlayerHolderLifecycleEventListener,
         OnKeyDownListener {
     public static final String KEY_SWITCHING_PLAYERS = "switching_players";
 
@@ -234,10 +236,9 @@ public final class VideoDetailFragment
     // Service management
     //////////////////////////////////////////////////////////////////////////*/
     @Override
-    public void onServiceConnected(final Player connectedPlayer,
-                                   final PlayerService connectedPlayerService,
+    public void onServiceConnected(final PlayerService connectedPlayerService,
                                    final boolean playAfterConnect) {
-        player = connectedPlayer;
+        player = connectedPlayerService.getPlayer();
         playerService = connectedPlayerService;
 
         // It will do nothing if the player is not in fullscreen mode
@@ -393,7 +394,7 @@ public void onDestroy() {
         if (activity.isFinishing() && isPlayerAvailable() && player.videoPlayerSelected()) {
             playerHolder.stopService();
         } else {
-            playerHolder.setListener(null);
+            playerHolder.unsetListeners();
         }
 
         PreferenceManager.getDefaultSharedPreferences(activity)
@@ -658,10 +659,10 @@ protected void initListeners() {
         });
 
         setupBottomPlayer();
-        if (!playerHolder.isBound()) {
+        if (playerHolder.isNotBoundYet()) {
             setHeightThumbnail();
         } else {
-            playerHolder.startService(false, this);
+            playerHolder.startService(false, this, this);
         }
     }
 
@@ -1052,7 +1053,7 @@ private void openPopupPlayer(final boolean append) {
 
         // See UI changes while remote playQueue changes
         if (!isPlayerAvailable()) {
-            playerHolder.startService(false, this);
+            playerHolder.startService(false, this, this);
         } else {
             // FIXME Workaround #7427
             player.setRecovery();
@@ -1115,7 +1116,7 @@ public void openVideoPlayerAutoFullscreen() {
     private void openNormalBackgroundPlayer(final boolean append) {
         // See UI changes while remote playQueue changes
         if (!isPlayerAvailable()) {
-            playerHolder.startService(false, this);
+            playerHolder.startService(false, this, this);
         }
 
         final PlayQueue queue = setupPlayQueueForIntent(append);
@@ -1129,7 +1130,7 @@ private void openNormalBackgroundPlayer(final boolean append) {
 
     private void openMainPlayer() {
         if (!isPlayerServiceAvailable()) {
-            playerHolder.startService(autoPlayEnabled, this);
+            playerHolder.startService(autoPlayEnabled, this, this);
             return;
         }
         if (currentInfo == null) {
@@ -1384,9 +1385,11 @@ public void onReceive(final Context context, final Intent intent) {
                             bottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
                         }
                         // Rebound to the service if it was closed via notification or mini player
-                        if (!playerHolder.isBound()) {
+                        if (playerHolder.isNotBoundYet()) {
                             playerHolder.startService(
-                                    false, VideoDetailFragment.this);
+                                    false,
+                                    VideoDetailFragment.this,
+                                    VideoDetailFragment.this);
                         }
                         break;
                 }

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

@@ -217,11 +217,16 @@ public void onServiceDisconnected(final ComponentName name) {
             }
 
             @Override
-            public void onServiceConnected(final ComponentName name, final IBinder service) {
+            public void onServiceConnected(final ComponentName name, final IBinder binder) {
                 Log.d(TAG, "Player service is connected");
 
-                if (service instanceof PlayerService.LocalBinder) {
-                    player = ((PlayerService.LocalBinder) service).getPlayer();
+                if (binder instanceof PlayerService.LocalBinder localBinder) {
+                    final @Nullable PlayerService s = localBinder.getService();
+                    if (s == null) {
+                        player = null;
+                    } else {
+                        player = s.getPlayer();
+                    }
                 }
 
                 if (player == null || player.getPlayQueue() == null || player.exoPlayerIsNull()) {

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

@@ -28,6 +28,8 @@
 import android.os.IBinder;
 import android.util.Log;
 
+import androidx.annotation.Nullable;
+
 import org.schabi.newpipe.player.mediasession.MediaSessionPlayerUi;
 import org.schabi.newpipe.player.notification.NotificationPlayerUi;
 import org.schabi.newpipe.util.ThemeHelper;
@@ -36,7 +38,9 @@
 
 
 /**
- * One service for all players.
+ * One background service for our player. Even though the player has multiple UIs
+ * (e.g. the audio-only UI, the main UI, the pulldown-menu UI),
+ * this allows us to keep playing even when switching between the different UIs.
  */
 public final class PlayerService extends Service {
     private static final String TAG = PlayerService.class.getSimpleName();
@@ -46,6 +50,9 @@ public final class PlayerService extends Service {
 
     private final IBinder mBinder = new PlayerService.LocalBinder(this);
 
+    public Player getPlayer() {
+        return player;
+    }
 
     /*//////////////////////////////////////////////////////////////////////////
     // Service's LifeCycle
@@ -167,19 +174,21 @@ public IBinder onBind(final Intent intent) {
         return mBinder;
     }
 
+    /** Allows us this {@link org.schabi.newpipe.player.PlayerService} over the Service boundary
+     * back to our {@link org.schabi.newpipe.player.helper.PlayerHolder}.
+      */
     public static class LocalBinder extends Binder {
         private final WeakReference<PlayerService> playerService;
 
         LocalBinder(final PlayerService playerService) {
             this.playerService = new WeakReference<>(playerService);
         }
 
-        public PlayerService getService() {
+        /** Get the PlayerService object itself.
+         * @return this
+         * */
+        public @Nullable PlayerService getService() {
             return playerService.get();
         }
-
-        public Player getPlayer() {
-            return playerService.get().player;
-        }
     }
 }

app/src/main/java/org/schabi/newpipe/player/event/PlayerEventListener.java

@@ -5,6 +5,7 @@
 import org.schabi.newpipe.extractor.stream.StreamInfo;
 import org.schabi.newpipe.player.playqueue.PlayQueue;
 
+/** Player-specific events like queue or progress updates. */
 public interface PlayerEventListener {
     void onQueueUpdate(PlayQueue queue);
     void onPlaybackUpdate(int state, int repeatMode, boolean shuffled,

app/src/main/java/org/schabi/newpipe/player/event/PlayerHolderLifecycleEventListener.java

@@ -0,0 +1,10 @@
+package org.schabi.newpipe.player.event;
+
+import org.schabi.newpipe.player.PlayerService;
+
+/** Gets signalled if our PlayerHolder (dis)connects from the PlayerService. */
+public interface PlayerHolderLifecycleEventListener {
+    void onServiceConnected(PlayerService playerService,
+                            boolean playAfterConnect);
+    void onServiceDisconnected();
+}

app/src/main/java/org/schabi/newpipe/player/event/PlayerServiceEventListener.java

@@ -2,6 +2,9 @@
 
 import com.google.android.exoplayer2.PlaybackException;
 
+/** {@link org.schabi.newpipe.player.event.PlayerEventListener} that also gets called for
+ * application-specific events like screen rotation or UI changes.
+ */
 public interface PlayerServiceEventListener extends PlayerEventListener {
     void onViewCreated();