Allow to remove all playlist items

PiperOrigin-RevId: 343437513

RELEASENOTES.md

@@ -51,6 +51,7 @@
 *   Media2 extension:
     *   Notify onBufferingEnded when the state of origin player becomes
         STATE_IDLE or STATE_ENDED.
+    *   Allow to remove all playlist items that makes the player reset.
 
 ### 2.12.1 (2020-10-23) ###
 

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

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.ext.media2;
 
+import static androidx.media2.common.SessionPlayer.PLAYER_STATE_IDLE;
 import static androidx.media2.common.SessionPlayer.PLAYER_STATE_PAUSED;
 import static androidx.media2.common.SessionPlayer.PLAYER_STATE_PLAYING;
 import static androidx.media2.common.SessionPlayer.PlayerResult.RESULT_INFO_SKIPPED;
@@ -60,6 +61,7 @@ import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.concurrent.atomic.AtomicReference;
 import org.junit.Before;
@@ -762,18 +764,42 @@ public class SessionPlayerConnectorTest {
   @SdkSuppress(minSdkVersion = Build.VERSION_CODES.KITKAT)
   public void setPlaylist_setsPlaylistAndCurrentMediaItem() throws Exception {
     List<MediaItem> playlist = TestUtils.createPlaylist(10);
-    CountDownLatch onCurrentMediaItemChangedLatch = new CountDownLatch(1);
-    sessionPlayerConnector.registerPlayerCallback(
-        executor, new PlayerCallbackForPlaylist(playlist, onCurrentMediaItemChangedLatch));
+    PlayerCallbackForPlaylist callback = new PlayerCallbackForPlaylist(playlist, 1);
+    sessionPlayerConnector.registerPlayerCallback(executor, callback);
 
     assertPlayerResultSuccess(sessionPlayerConnector.setPlaylist(playlist, null));
-    assertThat(onCurrentMediaItemChangedLatch.await(PLAYLIST_CHANGE_WAIT_TIME_MS, MILLISECONDS))
-        .isTrue();
+    assertThat(callback.await(PLAYLIST_CHANGE_WAIT_TIME_MS, MILLISECONDS)).isTrue();
 
     assertThat(sessionPlayerConnector.getPlaylist()).isEqualTo(playlist);
     assertThat(sessionPlayerConnector.getCurrentMediaItem()).isEqualTo(playlist.get(0));
   }
 
+  @Test
+  @LargeTest
+  @SdkSuppress(minSdkVersion = Build.VERSION_CODES.KITKAT)
+  public void setPlaylistAndRemoveAllPlaylistItem_playerStateBecomesIdle() throws Exception {
+    List<MediaItem> playlist = new ArrayList<>();
+    playlist.add(TestUtils.createMediaItem(R.raw.video_1));
+    PlayerCallbackForPlaylist callback =
+        new PlayerCallbackForPlaylist(playlist, 2) {
+          @Override
+          public void onPlayerStateChanged(@NonNull SessionPlayer player, int playerState) {
+            countDown();
+          }
+        };
+    sessionPlayerConnector.registerPlayerCallback(executor, callback);
+
+    assertPlayerResultSuccess(sessionPlayerConnector.setPlaylist(playlist, null));
+    assertPlayerResultSuccess(sessionPlayerConnector.prepare());
+    assertThat(callback.await(PLAYLIST_CHANGE_WAIT_TIME_MS, MILLISECONDS)).isTrue();
+    assertThat(sessionPlayerConnector.getPlayerState()).isEqualTo(PLAYER_STATE_PAUSED);
+
+    callback.resetLatch(1);
+    assertPlayerResultSuccess(sessionPlayerConnector.removePlaylistItem(0));
+    assertThat(callback.await(PLAYLIST_CHANGE_WAIT_TIME_MS, MILLISECONDS)).isTrue();
+    assertThat(sessionPlayerConnector.getPlayerState()).isEqualTo(PLAYER_STATE_IDLE);
+  }
+
   @Test
   @LargeTest
   @SdkSuppress(minSdkVersion = Build.VERSION_CODES.KITKAT)
@@ -958,14 +984,12 @@ public class SessionPlayerConnectorTest {
     int listSize = 2;
     List<MediaItem> playlist = TestUtils.createPlaylist(listSize);
 
-    CountDownLatch onCurrentMediaItemChangedLatch = new CountDownLatch(1);
-    sessionPlayerConnector.registerPlayerCallback(
-        executor, new PlayerCallbackForPlaylist(playlist, onCurrentMediaItemChangedLatch));
+    PlayerCallbackForPlaylist callback = new PlayerCallbackForPlaylist(playlist, 1);
+    sessionPlayerConnector.registerPlayerCallback(executor, callback);
 
     assertPlayerResultSuccess(sessionPlayerConnector.setPlaylist(playlist, null));
     assertThat(sessionPlayerConnector.getCurrentMediaItemIndex()).isEqualTo(0);
-    assertThat(onCurrentMediaItemChangedLatch.await(PLAYLIST_CHANGE_WAIT_TIME_MS, MILLISECONDS))
-        .isTrue();
+    assertThat(callback.await(PLAYLIST_CHANGE_WAIT_TIME_MS, MILLISECONDS)).isTrue();
   }
 
   @Test
@@ -1193,16 +1217,15 @@ public class SessionPlayerConnectorTest {
     int listSize = playlist.size();
 
     // Any value more than list size + 1, to see repeat mode with the recorded video.
-    CountDownLatch onCurrentMediaItemChangedLatch = new CountDownLatch(listSize + 2);
     CopyOnWriteArrayList<MediaItem> currentMediaItemChanges = new CopyOnWriteArrayList<>();
     PlayerCallbackForPlaylist callback =
-        new PlayerCallbackForPlaylist(playlist, onCurrentMediaItemChangedLatch) {
+        new PlayerCallbackForPlaylist(playlist, listSize + 2) {
           @Override
           public void onCurrentMediaItemChanged(
               @NonNull SessionPlayer player, @NonNull MediaItem item) {
             super.onCurrentMediaItemChanged(player, item);
             currentMediaItemChanges.add(item);
-            onCurrentMediaItemChangedLatch.countDown();
+            countDown();
           }
 
           @Override
@@ -1223,7 +1246,7 @@ public class SessionPlayerConnectorTest {
     assertWithMessage(
             "Current media item didn't change as expected. Actual changes were %s",
             currentMediaItemChanges)
-        .that(onCurrentMediaItemChangedLatch.await(PLAYBACK_COMPLETED_WAIT_TIME_MS, MILLISECONDS))
+        .that(callback.await(PLAYBACK_COMPLETED_WAIT_TIME_MS, MILLISECONDS))
         .isTrue();
 
     int expectedMediaItemIndex = 0;
@@ -1285,9 +1308,9 @@ public class SessionPlayerConnectorTest {
     private List<MediaItem> playlist;
     private CountDownLatch onCurrentMediaItemChangedLatch;
 
-    PlayerCallbackForPlaylist(List<MediaItem> playlist, CountDownLatch latch) {
+    PlayerCallbackForPlaylist(List<MediaItem> playlist, int count) {
       this.playlist = playlist;
-      onCurrentMediaItemChangedLatch = latch;
+      onCurrentMediaItemChangedLatch = new CountDownLatch(count);
     }
 
     @Override
@@ -1296,5 +1319,17 @@ public class SessionPlayerConnectorTest {
       assertThat(sessionPlayerConnector.getCurrentMediaItemIndex()).isEqualTo(currentIndex);
       onCurrentMediaItemChangedLatch.countDown();
     }
+
+    public void resetLatch(int count) {
+      onCurrentMediaItemChangedLatch = new CountDownLatch(count);
+    }
+
+    public boolean await(long timeout, TimeUnit unit) throws InterruptedException {
+      return onCurrentMediaItemChangedLatch.await(timeout, unit);
+    }
+
+    public void countDown() {
+      onCurrentMediaItemChangedLatch.countDown();
+    }
   }
 }

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

@@ -202,6 +202,9 @@ import java.util.List;
   }
 
   public boolean removePlaylistItem(@IntRange(from = 0) int index) {
+    if (player.getMediaItemCount() <= index) {
+      return false;
+    }
     player.removeMediaItem(index);
     return true;
   }
@@ -367,7 +370,9 @@ import java.util.List;
       case Player.STATE_IDLE:
         return SessionPlayer.PLAYER_STATE_IDLE;
       case Player.STATE_ENDED:
-        return SessionPlayer.PLAYER_STATE_PAUSED;
+        return player.getCurrentMediaItem() == null
+            ? SessionPlayer.PLAYER_STATE_IDLE
+            : SessionPlayer.PLAYER_STATE_PAUSED;
       case Player.STATE_BUFFERING:
       case Player.STATE_READY:
         return playWhenReady
@@ -428,7 +433,9 @@ import java.util.List;
         postOrRun(handler, pollBufferRunnable);
         break;
       case Player.STATE_ENDED:
-        listener.onPlaybackEnded();
+        if (player.getCurrentMediaItem() != null) {
+          listener.onPlaybackEnded();
+        }
         player.setPlayWhenReady(false);
         updateBufferingState(/* isBuffering= */ false);
         break;

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

@@ -559,12 +559,16 @@ public final class SessionPlayerConnector extends SessionPlayer {
     }
   }
 
+  // TODO: Remove this suppress warnings and call onCurrentMediaItemChanged with a null item
+  // once AndroidX media2 1.2.0 is released
+  @SuppressWarnings("nullness:argument.type.incompatible")
   private void handlePlaylistChangedOnHandler() {
     List<MediaItem> currentPlaylist = player.getPlaylist();
     MediaMetadata playlistMetadata = player.getPlaylistMetadata();
 
     MediaItem currentMediaItem = player.getCurrentMediaItem();
-    boolean notifyCurrentMediaItem = !ObjectsCompat.equals(this.currentMediaItem, currentMediaItem);
+    boolean notifyCurrentMediaItem =
+        !ObjectsCompat.equals(this.currentMediaItem, currentMediaItem) && currentMediaItem != null;
     this.currentMediaItem = currentMediaItem;
 
     long currentPosition = getCurrentPosition();
@@ -573,9 +577,6 @@ public final class SessionPlayerConnector extends SessionPlayer {
           callback.onPlaylistChanged(
               SessionPlayerConnector.this, currentPlaylist, playlistMetadata);
           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