Add listener callback for shuffle mode changes.

The listener implementations do not do anything yet.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=166056933

demos/main/src/main/java/com/google/android/exoplayer2/demo/EventLogger.java

@@ -100,6 +100,11 @@ import java.util.Locale;
   }
 
   @Override
+  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+    Log.d(TAG, "shuffleModeEnabled [" + shuffleModeEnabled + "]");
+  }
+
+  @Override
   public void onPositionDiscontinuity() {
     Log.d(TAG, "positionDiscontinuity");
   }

demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java

@@ -502,6 +502,11 @@ public class PlayerActivity extends Activity implements OnClickListener, EventLi
   }
 
   @Override
+  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+    // Do nothing.
+  }
+
+  @Override
   public void onPositionDiscontinuity() {
     if (inErrorState) {
       // This will only occur if the user has performed a seek whilst in the error state. Update the

extensions/flac/src/androidTest/java/com/google/android/exoplayer2/ext/flac/FlacPlaybackTest.java

@@ -132,6 +132,11 @@ public class FlacPlaybackTest extends InstrumentationTestCase {
       // Do nothing.
     }
 
+    @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+      // Do nothing.
+    }
+
     private void releasePlayerAndQuitLooper() {
       player.release();
       Looper.myLooper().quit();

extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java

@@ -567,6 +567,11 @@ public final class ImaAdsLoader implements Player.EventListener, VideoAdPlayer,
   }
 
   @Override
+  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+    // Do nothing.
+  }
+
+  @Override
   public void onPlayerError(ExoPlaybackException error) {
     if (playingAd) {
       for (int i = 0; i < adCallbacks.size(); i++) {

extensions/leanback/src/main/java/com/google/android/exoplayer2/ext/leanback/LeanbackPlayerAdapter.java

@@ -271,6 +271,11 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
       // Do nothing.
     }
 
+    @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+      // Do nothing.
+    }
+
     // SimpleExoplayerView.Callback implementation.
 
     @Override

extensions/mediasession/src/main/java/com/google/android/exoplayer2/ext/mediasession/MediaSessionConnector.java

@@ -620,6 +620,11 @@ public final class MediaSessionConnector {
     }
 
     @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+      // TODO: Support shuffle mode in MediaSessionConnector.
+    }
+
+    @Override
     public void onPlayerError(ExoPlaybackException error) {
       playbackException = error;
       updateMediaSessionPlaybackState();

extensions/opus/src/androidTest/java/com/google/android/exoplayer2/ext/opus/OpusPlaybackTest.java

@@ -132,6 +132,11 @@ public class OpusPlaybackTest extends InstrumentationTestCase {
       // Do nothing.
     }
 
+    @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+      // Do nothing.
+    }
+
     private void releasePlayerAndQuitLooper() {
       player.release();
       Looper.myLooper().quit();

extensions/vp9/src/androidTest/java/com/google/android/exoplayer2/ext/vp9/VpxPlaybackTest.java

@@ -164,6 +164,11 @@ public class VpxPlaybackTest extends InstrumentationTestCase {
       // Do nothing.
     }
 
+    @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+      // Do nothing.
+    }
+
     private void releasePlayerAndQuitLooper() {
       player.release();
       Looper.myLooper().quit();

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java

@@ -195,6 +195,9 @@ import java.util.concurrent.CopyOnWriteArraySet;
   public void setShuffleModeEnabled(boolean shuffleModeEnabled) {
     if (this.shuffleModeEnabled != shuffleModeEnabled) {
       this.shuffleModeEnabled = shuffleModeEnabled;
+      for (Player.EventListener listener : listeners) {
+        listener.onShuffleModeEnabledChanged(shuffleModeEnabled);
+      }
     }
   }
 
@@ -527,3 +530,4 @@ import java.util.concurrent.CopyOnWriteArraySet;
   }
 
 }
+

library/core/src/main/java/com/google/android/exoplayer2/Player.java

@@ -95,6 +95,13 @@ public interface Player {
     void onRepeatModeChanged(@RepeatMode int repeatMode);
 
     /**
+     * Called when the value of {@link #getShuffleModeEnabled()} changes.
+     *
+     * @param shuffleModeEnabled Whether shuffling of windows is enabled.
+     */
+    void onShuffleModeEnabledChanged(boolean shuffleModeEnabled);
+
+    /**
      * Called when an error occurs. The playback state will transition to {@link #STATE_IDLE}
      * immediately after this method is called. The player instance can still be used, and
      * {@link #release()} must still be called on the player should it no longer be required.

library/ui/src/main/java/com/google/android/exoplayer2/ui/DebugTextViewHelper.java

@@ -94,6 +94,11 @@ public final class DebugTextViewHelper implements Runnable, Player.EventListener
   }
 
   @Override
+  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+    // Do nothing.
+  }
+
+  @Override
   public void onPositionDiscontinuity() {
     updateAndPost();
   }

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlaybackControlView.java

@@ -1080,6 +1080,11 @@ public class PlaybackControlView extends FrameLayout {
     }
 
     @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+      // TODO: Update UI.
+    }
+
+    @Override
     public void onPositionDiscontinuity() {
       updateNavigation();
       updateProgress();

library/ui/src/main/java/com/google/android/exoplayer2/ui/SimpleExoPlayerView.java

@@ -897,6 +897,11 @@ public final class SimpleExoPlayerView extends FrameLayout {
     }
 
     @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+      // Do nothing.
+    }
+
+    @Override
     public void onPlayerError(ExoPlaybackException e) {
       // Do nothing.
     }

testutils/src/main/java/com/google/android/exoplayer2/testutil/Action.java

@@ -412,6 +412,11 @@ public abstract class Action {
     }
 
     @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+
+    }
+
+    @Override
     public void onPlayerError(ExoPlaybackException error) {
 
     }

testutils/src/main/java/com/google/android/exoplayer2/testutil/ExoHostedTest.java

@@ -236,6 +236,11 @@ public abstract class ExoHostedTest implements HostedTest, Player.EventListener,
   }
 
   @Override
+  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+    // Do nothing.
+  }
+
+  @Override
   public final void onPlayerError(ExoPlaybackException error) {
     playerWasPrepared = true;
     playerError = error;

testutils/src/main/java/com/google/android/exoplayer2/testutil/ExoPlayerTestRunner.java

@@ -361,6 +361,11 @@ public final class ExoPlayerTestRunner implements Player.EventListener {
   }
 
   @Override
+  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+    // Do nothing.
+  }
+
+  @Override
   public void onPlayerError(ExoPlaybackException error) {
     handleException(exception);
   }