PlayerHolder: Separate holder and service event interface

Should make it easier to seperate the two further later, both of them
are only implemented by VideoDetailFragment anyway, which is kind of a
code smell!

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

@@ -95,7 +95,8 @@ import org.schabi.newpipe.player.Player;
 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 @@ import io.reactivex.rxjava3.schedulers.Schedulers;
 public final class VideoDetailFragment
         extends BaseStateFragment<StreamInfo>
         implements BackPressable,
-        PlayerServiceExtendedEventListener,
+        PlayerServiceEventListener,
+        PlayerHolderLifecycleEventListener,
         OnKeyDownListener {
     public static final String KEY_SWITCHING_PLAYERS = "switching_players";
 
@@ -392,7 +394,7 @@ public final class VideoDetailFragment
         if (activity.isFinishing() && isPlayerAvailable() && player.videoPlayerSelected()) {
             playerHolder.stopService();
         } else {
-            playerHolder.setListener(null);
+            playerHolder.unsetListeners();
         }
 
         PreferenceManager.getDefaultSharedPreferences(activity)
@@ -660,7 +662,7 @@ public final class VideoDetailFragment
         if (playerHolder.isNotBoundYet()) {
             setHeightThumbnail();
         } else {
-            playerHolder.startService(false, this);
+            playerHolder.startService(false, this, this);
         }
     }
 
@@ -1051,7 +1053,7 @@ public final class VideoDetailFragment
 
         // See UI changes while remote playQueue changes
         if (!isPlayerAvailable()) {
-            playerHolder.startService(false, this);
+            playerHolder.startService(false, this, this);
         } else {
             // FIXME Workaround #7427
             player.setRecovery();
@@ -1114,7 +1116,7 @@ public final class VideoDetailFragment
     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);
@@ -1128,7 +1130,7 @@ public final class VideoDetailFragment
 
     private void openMainPlayer() {
         if (!isPlayerServiceAvailable()) {
-            playerHolder.startService(autoPlayEnabled, this);
+            playerHolder.startService(autoPlayEnabled, this, this);
             return;
         }
         if (currentInfo == null) {
@@ -1385,7 +1387,9 @@ public final class VideoDetailFragment
                         // Rebound to the service if it was closed via notification or mini player
                         if (playerHolder.isNotBoundYet()) {
                             playerHolder.startService(
-                                    false, VideoDetailFragment.this);
+                                    false,
+                                    VideoDetailFragment.this,
+                                    VideoDetailFragment.this);
                         }
                         break;
                 }

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

@@ -5,6 +5,7 @@ import com.google.android.exoplayer2.PlaybackParameters;
 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

@@ -2,7 +2,8 @@ package org.schabi.newpipe.player.event;
 
 import org.schabi.newpipe.player.PlayerService;
 
-public interface PlayerServiceExtendedEventListener extends PlayerServiceEventListener {
+/** 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 @@ package org.schabi.newpipe.player.event;
 
 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();
 

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

@@ -7,6 +7,7 @@ import android.content.ServiceConnection;
 import android.os.IBinder;
 import android.util.Log;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.core.content.ContextCompat;
 
@@ -20,7 +21,7 @@ import org.schabi.newpipe.player.Player;
 import org.schabi.newpipe.player.PlayerService;
 import org.schabi.newpipe.player.PlayerType;
 import org.schabi.newpipe.player.event.PlayerServiceEventListener;
-import org.schabi.newpipe.player.event.PlayerServiceExtendedEventListener;
+import org.schabi.newpipe.player.event.PlayerHolderLifecycleEventListener;
 import org.schabi.newpipe.player.playqueue.PlayQueue;
 
 /** Singleton that manages a `PlayerService`
@@ -41,7 +42,8 @@ public final class PlayerHolder {
     private static final boolean DEBUG = MainActivity.DEBUG;
     private static final String TAG = PlayerHolder.class.getSimpleName();
 
-    @Nullable private PlayerServiceExtendedEventListener listener;
+    @Nullable private PlayerServiceEventListener listener;
+    @Nullable private PlayerHolderLifecycleEventListener holderListener;
 
     private final PlayerServiceConnection serviceConnection = new PlayerServiceConnection();
     private boolean bound;
@@ -102,16 +104,19 @@ public final class PlayerHolder {
         return player.getPlayQueue().getIndex();
     }
 
-    public void setListener(@Nullable final PlayerServiceExtendedEventListener newListener) {
-        listener = newListener;
+    public void unsetListeners() {
+        listener = null;
+        holderListener = null;
+    }
 
-        if (listener == null) {
-            return;
-        }
+    public void setListener(@NonNull final PlayerServiceEventListener newListener,
+                            @NonNull final PlayerHolderLifecycleEventListener newHolderListener) {
+        listener = newListener;
+        holderListener = newHolderListener;
 
         // Force reload data from service
         if (player != null) {
-            listener.onServiceConnected(playerService, false);
+            holderListener.onServiceConnected(playerService, false);
             player.setFragmentListener(internalListener);
         }
     }
@@ -131,11 +136,14 @@ public final class PlayerHolder {
      * If the service is already started, only set the listener.
      * @param playAfterConnect If the service is started, start playing immediately
      * @param newListener set this listener
+     * @param newHolderListener set this listener
      * */
     public void startService(final boolean playAfterConnect,
-                             final PlayerServiceExtendedEventListener newListener) {
+                             final PlayerServiceEventListener newListener,
+                             final PlayerHolderLifecycleEventListener newHolderListener
+    ) {
         final Context context = getCommonContext();
-        setListener(newListener);
+        setListener(newListener, newHolderListener);
         if (bound) {
             return;
         }
@@ -182,8 +190,8 @@ public final class PlayerHolder {
             }
             playerService = null;
             player = null;
-            if (listener != null) {
-                listener.onServiceDisconnected();
+            if (holderListener != null) {
+                holderListener.onServiceDisconnected();
             }
         }
     }
@@ -212,8 +220,8 @@ public final class PlayerHolder {
             playerService = localBinder.getService();
             player = playerService != null ? playerService.getPlayer() : null;
 
-            if (listener != null) {
-                listener.onServiceConnected(playerService, playAfterConnect);
+            if (holderListener != null) {
+                holderListener.onServiceConnected(playerService, playAfterConnect);
             }
             if (player != null) {
                 player.setFragmentListener(internalListener);