Notify current media item to legacy controllers

This is the workaround for b/159147455.

The issue will be fixed in media2-session 1.1.0-stable, but we'd
better to have workaround until it's ready.

PiperOrigin-RevId: 325434543

extensions/media2/src/androidTest/java/com/google/android/exoplayer2/ext/media2/SessionPlayerConnectorTest.java

@@ -434,7 +434,9 @@ public class SessionPlayerConnectorTest {
     // prepare() will be pending until readAllowed is countDowned.
     sessionPlayerConnector.prepare();
 
-    AtomicLong seekPosition = new AtomicLong();
+    CopyOnWriteArrayList<Long> positionChanges = new CopyOnWriteArrayList<>();
+    long testIntermediateSeekToPosition1 = 3000;
+    long testIntermediateSeekToPosition2 = 2000;
     long testFinalSeekToPosition = 1000;
     CountDownLatch onSeekCompletedLatch = new CountDownLatch(1);
     sessionPlayerConnector.registerPlayerCallback(
@@ -444,13 +446,17 @@ public class SessionPlayerConnectorTest {
           public void onSeekCompleted(@NonNull SessionPlayer player, long position) {
             // Do not assert here, because onSeekCompleted() can be called after the player is
             // closed.
-            seekPosition.set(position);
-            onSeekCompletedLatch.countDown();
+            positionChanges.add(position);
+            if (position == testFinalSeekToPosition) {
+              onSeekCompletedLatch.countDown();
+            }
           }
         });
 
-    ListenableFuture<PlayerResult> seekFuture1 = sessionPlayerConnector.seekTo(3000);
-    ListenableFuture<PlayerResult> seekFuture2 = sessionPlayerConnector.seekTo(2000);
+    ListenableFuture<PlayerResult> seekFuture1 =
+        sessionPlayerConnector.seekTo(testIntermediateSeekToPosition1);
+    ListenableFuture<PlayerResult> seekFuture2 =
+        sessionPlayerConnector.seekTo(testIntermediateSeekToPosition2);
     ListenableFuture<PlayerResult> seekFuture3 =
         sessionPlayerConnector.seekTo(testFinalSeekToPosition);
 
@@ -460,7 +466,9 @@ public class SessionPlayerConnectorTest {
     assertThat(seekFuture2.get().getResultCode()).isEqualTo(RESULT_INFO_SKIPPED);
     assertThat(seekFuture3.get().getResultCode()).isEqualTo(RESULT_SUCCESS);
     assertThat(onSeekCompletedLatch.await(PLAYBACK_COMPLETED_WAIT_TIME_MS, MILLISECONDS)).isTrue();
-    assertThat(seekPosition.get()).isEqualTo(testFinalSeekToPosition);
+    assertThat(positionChanges)
+        .containsNoneOf(testIntermediateSeekToPosition1, testIntermediateSeekToPosition2);
+    assertThat(positionChanges).contains(testFinalSeekToPosition);
   }
 
   @Test

extensions/media2/src/main/java/com/google/android/exoplayer2/ext/media2/SessionPlayerConnector.java

@@ -578,6 +578,7 @@ public final class SessionPlayerConnector extends SessionPlayer {
     if (!notifyCurrentMediaItem && !notifyCurrentPlaylist) {
       return;
     }
+    long currentPosition = getCurrentPosition();
     notifySessionPlayerCallback(
         callback -> {
           if (notifyCurrentPlaylist) {
@@ -587,7 +588,13 @@ public final class SessionPlayerConnector extends SessionPlayer {
           if (notifyCurrentMediaItem) {
             Assertions.checkNotNull(
                 currentMediaItem, "PlaylistManager#currentMediaItem() cannot be changed to null");
+
             callback.onCurrentMediaItemChanged(SessionPlayerConnector.this, currentMediaItem);
+
+            // Workaround for MediaSession's issue that current media item change isn't propagated
+            // to the legacy controllers.
+            // TODO(b/160846312): Remove this workaround with media2 1.1.0-stable.
+            callback.onSeekCompleted(SessionPlayerConnector.this, currentPosition);
           }
         });
   }
@@ -598,9 +605,16 @@ public final class SessionPlayerConnector extends SessionPlayer {
       return;
     }
     this.currentMediaItem = currentMediaItem;
+    long currentPosition = getCurrentPosition();
     notifySessionPlayerCallback(
-        callback ->
-            callback.onCurrentMediaItemChanged(SessionPlayerConnector.this, currentMediaItem));
+        callback -> {
+          callback.onCurrentMediaItemChanged(SessionPlayerConnector.this, currentMediaItem);
+
+          // Workaround for MediaSession's issue that current media item change isn't propagated
+          // to the legacy controllers.
+          // TODO(b/160846312): Remove this workaround with media2 1.1.0-stable.
+          callback.onSeekCompleted(SessionPlayerConnector.this, currentPosition);
+        });
   }
 
   private <T> T runPlayerCallableBlocking(Callable<T> callable) {
@@ -689,8 +703,9 @@ public final class SessionPlayerConnector extends SessionPlayer {
 
     @Override
     public void onSeekCompleted() {
+      long currentPosition = getCurrentPosition();
       notifySessionPlayerCallback(
-          callback -> callback.onSeekCompleted(SessionPlayerConnector.this, getCurrentPosition()));
+          callback -> callback.onSeekCompleted(SessionPlayerConnector.this, currentPosition));
     }
 
     @Override
@@ -720,8 +735,16 @@ public final class SessionPlayerConnector extends SessionPlayer {
         return;
       }
       currentMediaItem = mediaItem;
+      long currentPosition = getCurrentPosition();
       notifySessionPlayerCallback(
-          callback -> callback.onCurrentMediaItemChanged(SessionPlayerConnector.this, mediaItem));
+          callback -> {
+            callback.onCurrentMediaItemChanged(SessionPlayerConnector.this, mediaItem);
+
+            // Workaround for MediaSession's issue that current media item change isn't propagated
+            // to the legacy controllers.
+            // TODO(b/160846312): Remove this workaround with media2 1.1.0-stable.
+            callback.onSeekCompleted(SessionPlayerConnector.this, currentPosition);
+          });
     }
 
     @Override