Add abstract, default Player event listener.

This allows simplified listener implementations as most listeners
will not listen to all possible notifications.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170177821

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

@@ -37,11 +37,8 @@ import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.DefaultRenderersFactory;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayerFactory;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
-import com.google.android.exoplayer2.Player.EventListener;
 import com.google.android.exoplayer2.SimpleExoPlayer;
-import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.drm.DefaultDrmSessionManager;
 import com.google.android.exoplayer2.drm.DrmSessionManager;
 import com.google.android.exoplayer2.drm.FrameworkMediaCrypto;
@@ -83,7 +80,7 @@ import java.util.UUID;
 /**
  * An activity that plays media using {@link SimpleExoPlayer}.
  */
-public class PlayerActivity extends Activity implements OnClickListener, EventListener,
+public class PlayerActivity extends Activity implements OnClickListener,
     PlaybackControlView.VisibilityListener {
 
   public static final String DRM_SCHEME_UUID_EXTRA = "drm_scheme_uuid";
@@ -294,7 +291,7 @@ public class PlayerActivity extends Activity implements OnClickListener, EventLi
           drmSessionManager, extensionRendererMode);
 
       player = ExoPlayerFactory.newSimpleInstance(renderersFactory, trackSelector);
-      player.addListener(this);
+      player.addListener(new PlayerEventListener());
       player.addListener(eventLogger);
       player.addMetadataOutput(eventLogger);
       player.setAudioDebugListener(eventLogger);
@@ -472,110 +469,6 @@ public class PlayerActivity extends Activity implements OnClickListener, EventLi
     }
   }
 
-  // Player.EventListener implementation
-
-  @Override
-  public void onLoadingChanged(boolean isLoading) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
-    if (playbackState == Player.STATE_ENDED) {
-      showControls();
-    }
-    updateButtonVisibilities();
-  }
-
-  @Override
-  public void onRepeatModeChanged(int repeatMode) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
-    if (inErrorState) {
-      // This will only occur if the user has performed a seek whilst in the error state. Update the
-      // resume position so that if the user then retries, playback will resume from the position to
-      // which they seeked.
-      updateResumePosition();
-    }
-  }
-
-  @Override
-  public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onTimelineChanged(Timeline timeline, Object manifest) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onPlayerError(ExoPlaybackException e) {
-    String errorString = null;
-    if (e.type == ExoPlaybackException.TYPE_RENDERER) {
-      Exception cause = e.getRendererException();
-      if (cause instanceof DecoderInitializationException) {
-        // Special case for decoder initialization failures.
-        DecoderInitializationException decoderInitializationException =
-            (DecoderInitializationException) cause;
-        if (decoderInitializationException.decoderName == null) {
-          if (decoderInitializationException.getCause() instanceof DecoderQueryException) {
-            errorString = getString(R.string.error_querying_decoders);
-          } else if (decoderInitializationException.secureDecoderRequired) {
-            errorString = getString(R.string.error_no_secure_decoder,
-                decoderInitializationException.mimeType);
-          } else {
-            errorString = getString(R.string.error_no_decoder,
-                decoderInitializationException.mimeType);
-          }
-        } else {
-          errorString = getString(R.string.error_instantiating_decoder,
-              decoderInitializationException.decoderName);
-        }
-      }
-    }
-    if (errorString != null) {
-      showToast(errorString);
-    }
-    inErrorState = true;
-    if (isBehindLiveWindow(e)) {
-      clearResumePosition();
-      initializePlayer();
-    } else {
-      updateResumePosition();
-      updateButtonVisibilities();
-      showControls();
-    }
-  }
-
-  @Override
-  @SuppressWarnings("ReferenceEquality")
-  public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
-    updateButtonVisibilities();
-    if (trackGroups != lastSeenTrackGroupArray) {
-      MappedTrackInfo mappedTrackInfo = trackSelector.getCurrentMappedTrackInfo();
-      if (mappedTrackInfo != null) {
-        if (mappedTrackInfo.getTrackTypeRendererSupport(C.TRACK_TYPE_VIDEO)
-            == MappedTrackInfo.RENDERER_SUPPORT_UNSUPPORTED_TRACKS) {
-          showToast(R.string.error_unsupported_video);
-        }
-        if (mappedTrackInfo.getTrackTypeRendererSupport(C.TRACK_TYPE_AUDIO)
-            == MappedTrackInfo.RENDERER_SUPPORT_UNSUPPORTED_TRACKS) {
-          showToast(R.string.error_unsupported_audio);
-        }
-      }
-      lastSeenTrackGroupArray = trackGroups;
-    }
-  }
-
   // User controls
 
   private void updateButtonVisibilities() {
@@ -645,4 +538,85 @@ public class PlayerActivity extends Activity implements OnClickListener, EventLi
     return false;
   }
 
+  private class PlayerEventListener extends Player.DefaultEventListener {
+
+    @Override
+    public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
+      if (playbackState == Player.STATE_ENDED) {
+        showControls();
+      }
+      updateButtonVisibilities();
+    }
+
+    @Override
+    public void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
+      if (inErrorState) {
+        // This will only occur if the user has performed a seek whilst in the error state. Update
+        // the resume position so that if the user then retries, playback will resume from the
+        // position to which they seeked.
+        updateResumePosition();
+      }
+    }
+
+    @Override
+    public void onPlayerError(ExoPlaybackException e) {
+      String errorString = null;
+      if (e.type == ExoPlaybackException.TYPE_RENDERER) {
+        Exception cause = e.getRendererException();
+        if (cause instanceof DecoderInitializationException) {
+          // Special case for decoder initialization failures.
+          DecoderInitializationException decoderInitializationException =
+              (DecoderInitializationException) cause;
+          if (decoderInitializationException.decoderName == null) {
+            if (decoderInitializationException.getCause() instanceof DecoderQueryException) {
+              errorString = getString(R.string.error_querying_decoders);
+            } else if (decoderInitializationException.secureDecoderRequired) {
+              errorString = getString(R.string.error_no_secure_decoder,
+                  decoderInitializationException.mimeType);
+            } else {
+              errorString = getString(R.string.error_no_decoder,
+                  decoderInitializationException.mimeType);
+            }
+          } else {
+            errorString = getString(R.string.error_instantiating_decoder,
+                decoderInitializationException.decoderName);
+          }
+        }
+      }
+      if (errorString != null) {
+        showToast(errorString);
+      }
+      inErrorState = true;
+      if (isBehindLiveWindow(e)) {
+        clearResumePosition();
+        initializePlayer();
+      } else {
+        updateResumePosition();
+        updateButtonVisibilities();
+        showControls();
+      }
+    }
+
+    @Override
+    @SuppressWarnings("ReferenceEquality")
+    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
+      updateButtonVisibilities();
+      if (trackGroups != lastSeenTrackGroupArray) {
+        MappedTrackInfo mappedTrackInfo = trackSelector.getCurrentMappedTrackInfo();
+        if (mappedTrackInfo != null) {
+          if (mappedTrackInfo.getTrackTypeRendererSupport(C.TRACK_TYPE_VIDEO)
+              == MappedTrackInfo.RENDERER_SUPPORT_UNSUPPORTED_TRACKS) {
+            showToast(R.string.error_unsupported_video);
+          }
+          if (mappedTrackInfo.getTrackTypeRendererSupport(C.TRACK_TYPE_AUDIO)
+              == MappedTrackInfo.RENDERER_SUPPORT_UNSUPPORTED_TRACKS) {
+            showToast(R.string.error_unsupported_audio);
+          }
+        }
+        lastSeenTrackGroupArray = trackGroups;
+      }
+    }
+
+  }
+
 }

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

@@ -22,15 +22,11 @@ import android.test.InstrumentationTestCase;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.ExoPlayerFactory;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Renderer;
-import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.extractor.mkv.MatroskaExtractor;
 import com.google.android.exoplayer2.source.ExtractorMediaSource;
-import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
 
 /**
@@ -45,20 +41,22 @@ public class FlacPlaybackTest extends InstrumentationTestCase {
   }
 
   private void playUri(String uri) throws ExoPlaybackException {
-    TestPlaybackThread thread = new TestPlaybackThread(Uri.parse(uri),
+    TestPlaybackRunnable testPlaybackRunnable = new TestPlaybackRunnable(Uri.parse(uri),
         getInstrumentation().getContext());
+    Thread thread = new Thread(testPlaybackRunnable);
     thread.start();
     try {
       thread.join();
     } catch (InterruptedException e) {
       fail(); // Should never happen.
     }
-    if (thread.playbackException != null) {
+    if (testPlaybackRunnable.playbackException != null) {
-      throw thread.playbackException;
+      throw testPlaybackRunnable.playbackException;
     }
   }
 
-  private static class TestPlaybackThread extends Thread implements Player.EventListener {
+  private static class TestPlaybackRunnable extends Player.DefaultEventListener
+      implements Runnable {
 
     private final Context context;
     private final Uri uri;
@@ -66,7 +64,7 @@ public class FlacPlaybackTest extends InstrumentationTestCase {
     private ExoPlayer player;
     private ExoPlaybackException playbackException;
 
-    public TestPlaybackThread(Uri uri, Context context) {
+    public TestPlaybackRunnable(Uri uri, Context context) {
       this.uri = uri;
       this.context = context;
     }
@@ -89,31 +87,6 @@ public class FlacPlaybackTest extends InstrumentationTestCase {
       Looper.loop();
     }
 
-    @Override
-    public void onLoadingChanged(boolean isLoading) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onTimelineChanged(Timeline timeline, Object manifest) {
-      // Do nothing.
-    }
-
     @Override
     public void onPlayerError(ExoPlaybackException error) {
       playbackException = error;
@@ -123,25 +96,11 @@ public class FlacPlaybackTest extends InstrumentationTestCase {
     public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
       if (playbackState == Player.STATE_ENDED
           || (playbackState == Player.STATE_IDLE && playbackException != null)) {
-        releasePlayerAndQuitLooper();
+        player.release();
+        Looper.myLooper().quit();
       }
     }
 
-    @Override
-    public void onRepeatModeChanged(int repeatMode) {
-      // 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

@@ -43,13 +43,10 @@ import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Timeline;
-import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.source.ads.AdPlaybackState;
 import com.google.android.exoplayer2.source.ads.AdsLoader;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.util.Assertions;
 import java.io.IOException;
 import java.util.ArrayList;
@@ -59,8 +56,8 @@ import java.util.Map;
 /**
  * Loads ads using the IMA SDK. All methods are called on the main thread.
  */
-public final class ImaAdsLoader implements AdsLoader, Player.EventListener, VideoAdPlayer,
+public final class ImaAdsLoader extends Player.DefaultEventListener implements AdsLoader,
-    ContentProgressProvider, AdErrorListener, AdsLoadedListener, AdEventListener {
+    VideoAdPlayer, ContentProgressProvider, AdErrorListener, AdsLoadedListener, AdEventListener {
 
   static {
     ExoPlayerLibraryInfo.registerModule("goog.exo.ima");
@@ -511,16 +508,6 @@ public final class ImaAdsLoader implements AdsLoader, Player.EventListener, Vide
     updateImaStateForPlayerState();
   }
 
-  @Override
-  public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onLoadingChanged(boolean isLoading) {
-    // Do nothing.
-  }
-
   @Override
   public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
     if (adsManager == null) {
@@ -538,16 +525,6 @@ public final class ImaAdsLoader implements AdsLoader, Player.EventListener, Vide
     }
   }
 
-  @Override
-  public void onRepeatModeChanged(int repeatMode) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
-    // Do nothing.
-  }
-
   @Override
   public void onPlayerError(ExoPlaybackException error) {
     if (playingAd) {
@@ -584,11 +561,6 @@ public final class ImaAdsLoader implements AdsLoader, Player.EventListener, Vide
     }
   }
 
-  @Override
-  public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-    // Do nothing.
-  }
-
   // Internal methods.
 
   private void requestAds() {

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

@@ -30,13 +30,10 @@ import com.google.android.exoplayer2.ControlDispatcher;
 import com.google.android.exoplayer2.DefaultControlDispatcher;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Player.DiscontinuityReason;
 import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.Timeline;
-import com.google.android.exoplayer2.source.TrackGroupArray;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.util.ErrorMessageProvider;
 
 /**
@@ -221,7 +218,7 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
     }
   }
 
-  private final class ComponentListener implements Player.EventListener,
+  private final class ComponentListener extends Player.DefaultEventListener implements
       SimpleExoPlayer.VideoListener, SurfaceHolder.Callback {
 
     // SurfaceHolder.Callback implementation.
@@ -260,11 +257,6 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
       }
     }
 
-    @Override
-    public void onLoadingChanged(boolean isLoading) {
-      // Do nothing.
-    }
-
     @Override
     public void onTimelineChanged(Timeline timeline, Object manifest) {
       Callback callback = getCallback();
@@ -273,11 +265,6 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
       callback.onBufferedPositionChanged(LeanbackPlayerAdapter.this);
     }
 
-    @Override
-    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
-      // Do nothing.
-    }
-
     @Override
     public void onPositionDiscontinuity(@DiscontinuityReason int reason) {
       Callback callback = getCallback();
@@ -285,21 +272,6 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter {
       callback.onBufferedPositionChanged(LeanbackPlayerAdapter.this);
     }
 
-    @Override
-    public void onPlaybackParametersChanged(PlaybackParameters params) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onRepeatModeChanged(int repeatMode) {
-      // 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

@@ -36,8 +36,6 @@ import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
 import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Timeline;
-import com.google.android.exoplayer2.source.TrackGroupArray;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.util.ErrorMessageProvider;
 import com.google.android.exoplayer2.util.RepeatModeUtil;
 import java.util.Collections;
@@ -624,7 +622,7 @@ public final class MediaSessionConnector {
         & QueueEditor.ACTIONS & action) != 0;
   }
 
-  private class ExoPlayerEventListener implements Player.EventListener {
+  private class ExoPlayerEventListener extends Player.DefaultEventListener {
 
     private int currentWindowIndex;
     private int currentWindowCount;
@@ -649,16 +647,6 @@ public final class MediaSessionConnector {
       updateMediaSessionMetadata();
     }
 
-    @Override
-    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onLoadingChanged(boolean isLoading) {
-      // Do nothing.
-    }
-
     @Override
     public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
       updateMediaSessionPlaybackState();

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

@@ -22,15 +22,11 @@ import android.test.InstrumentationTestCase;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.ExoPlayerFactory;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Renderer;
-import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.extractor.mkv.MatroskaExtractor;
 import com.google.android.exoplayer2.source.ExtractorMediaSource;
-import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
 
 /**
@@ -45,20 +41,22 @@ public class OpusPlaybackTest extends InstrumentationTestCase {
   }
 
   private void playUri(String uri) throws ExoPlaybackException {
-    TestPlaybackThread thread = new TestPlaybackThread(Uri.parse(uri),
+    TestPlaybackRunnable testPlaybackRunnable = new TestPlaybackRunnable(Uri.parse(uri),
         getInstrumentation().getContext());
+    Thread thread = new Thread(testPlaybackRunnable);
     thread.start();
     try {
       thread.join();
     } catch (InterruptedException e) {
       fail(); // Should never happen.
     }
-    if (thread.playbackException != null) {
+    if (testPlaybackRunnable.playbackException != null) {
-      throw thread.playbackException;
+      throw testPlaybackRunnable.playbackException;
     }
   }
 
-  private static class TestPlaybackThread extends Thread implements Player.EventListener {
+  private static class TestPlaybackRunnable extends Player.DefaultEventListener
+      implements Runnable {
 
     private final Context context;
     private final Uri uri;
@@ -66,7 +64,7 @@ public class OpusPlaybackTest extends InstrumentationTestCase {
     private ExoPlayer player;
     private ExoPlaybackException playbackException;
 
-    public TestPlaybackThread(Uri uri, Context context) {
+    public TestPlaybackRunnable(Uri uri, Context context) {
       this.uri = uri;
       this.context = context;
     }
@@ -89,31 +87,6 @@ public class OpusPlaybackTest extends InstrumentationTestCase {
       Looper.loop();
     }
 
-    @Override
-    public void onLoadingChanged(boolean isLoading) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onTimelineChanged(Timeline timeline, Object manifest) {
-      // Do nothing.
-    }
-
     @Override
     public void onPlayerError(ExoPlaybackException error) {
       playbackException = error;
@@ -123,25 +96,11 @@ public class OpusPlaybackTest extends InstrumentationTestCase {
     public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
       if (playbackState == Player.STATE_ENDED
           || (playbackState == Player.STATE_IDLE && playbackException != null)) {
-        releasePlayerAndQuitLooper();
+        player.release();
+        Looper.myLooper().quit();
       }
     }
 
-    @Override
-    public void onRepeatModeChanged(int repeatMode) {
-      // 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

@@ -23,15 +23,11 @@ import android.util.Log;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.ExoPlayerFactory;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Renderer;
-import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.extractor.mkv.MatroskaExtractor;
 import com.google.android.exoplayer2.source.ExtractorMediaSource;
-import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
 
 /**
@@ -74,20 +70,22 @@ public class VpxPlaybackTest extends InstrumentationTestCase {
   }
 
   private void playUri(String uri) throws ExoPlaybackException {
-    TestPlaybackThread thread = new TestPlaybackThread(Uri.parse(uri),
+    TestPlaybackRunnable testPlaybackRunnable = new TestPlaybackRunnable(Uri.parse(uri),
         getInstrumentation().getContext());
+    Thread thread = new Thread(testPlaybackRunnable);
     thread.start();
     try {
       thread.join();
     } catch (InterruptedException e) {
       fail(); // Should never happen.
     }
-    if (thread.playbackException != null) {
+    if (testPlaybackRunnable.playbackException != null) {
-      throw thread.playbackException;
+      throw testPlaybackRunnable.playbackException;
     }
   }
 
-  private static class TestPlaybackThread extends Thread implements Player.EventListener {
+  private static class TestPlaybackRunnable extends Player.DefaultEventListener
+      implements Runnable {
 
     private final Context context;
     private final Uri uri;
@@ -95,7 +93,7 @@ public class VpxPlaybackTest extends InstrumentationTestCase {
     private ExoPlayer player;
     private ExoPlaybackException playbackException;
 
-    public TestPlaybackThread(Uri uri, Context context) {
+    public TestPlaybackRunnable(Uri uri, Context context) {
       this.uri = uri;
       this.context = context;
     }
@@ -121,31 +119,6 @@ public class VpxPlaybackTest extends InstrumentationTestCase {
       Looper.loop();
     }
 
-    @Override
-    public void onLoadingChanged(boolean isLoading) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onTimelineChanged(Timeline timeline, Object manifest) {
-      // Do nothing.
-    }
-
     @Override
     public void onPlayerError(ExoPlaybackException error) {
       playbackException = error;
@@ -155,25 +128,11 @@ public class VpxPlaybackTest extends InstrumentationTestCase {
     public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
       if (playbackState == Player.STATE_ENDED
           || (playbackState == Player.STATE_IDLE && playbackException != null)) {
-        releasePlayerAndQuitLooper();
+        player.release();
+        Looper.myLooper().quit();
       }
     }
 
-    @Override
-    public void onRepeatModeChanged(int repeatMode) {
-      // 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/Player.java

@@ -136,6 +136,58 @@ public interface Player {
 
   }
 
+  /**
+   * {@link EventListener} allowing selective overrides. All methods are implemented as no-ops.
+   */
+  abstract class DefaultEventListener implements EventListener {
+
+    @Override
+    public void onTimelineChanged(Timeline timeline, Object manifest) {
+      // Do nothing.
+    }
+
+    @Override
+    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
+      // Do nothing.
+    }
+
+    @Override
+    public void onLoadingChanged(boolean isLoading) {
+      // Do nothing.
+    }
+
+    @Override
+    public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
+      // Do nothing.
+    }
+
+    @Override
+    public void onRepeatModeChanged(int repeatMode) {
+      // Do nothing.
+    }
+
+    @Override
+    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
+      // Do nothing.
+    }
+
+    @Override
+    public void onPlayerError(ExoPlaybackException error) {
+      // Do nothing.
+    }
+
+    @Override
+    public void onPositionDiscontinuity(int reason) {
+      // Do nothing.
+    }
+
+    @Override
+    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
+      // Do nothing.
+    }
+
+  }
+
   /**
    * The player does not have any media to play.
    */

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

@@ -17,22 +17,17 @@ package com.google.android.exoplayer2.ui;
 
 import android.annotation.SuppressLint;
 import android.widget.TextView;
-import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.Format;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.SimpleExoPlayer;
-import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.decoder.DecoderCounters;
-import com.google.android.exoplayer2.source.TrackGroupArray;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import java.util.Locale;
 
 /**
  * A helper class for periodically updating a {@link TextView} with debug information obtained from
  * a {@link SimpleExoPlayer}.
  */
-public final class DebugTextViewHelper implements Runnable, Player.EventListener {
+public final class DebugTextViewHelper extends Player.DefaultEventListener implements Runnable {
 
   private static final int REFRESH_INTERVAL_MS = 1000;
 
@@ -78,51 +73,16 @@ public final class DebugTextViewHelper implements Runnable, Player.EventListener
 
   // Player.EventListener implementation.
 
-  @Override
-  public void onLoadingChanged(boolean isLoading) {
-    // Do nothing.
-  }
-
   @Override
   public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
     updateAndPost();
   }
 
-  @Override
-  public void onRepeatModeChanged(int repeatMode) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
-    // Do nothing.
-  }
-
   @Override
   public void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
     updateAndPost();
   }
 
-  @Override
-  public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onTimelineChanged(Timeline timeline, Object manifest) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onPlayerError(ExoPlaybackException error) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onTracksChanged(TrackGroupArray tracks, TrackSelectionArray selections) {
-    // Do nothing.
-  }
-
   // Runnable implementation.
 
   @Override

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

@@ -30,13 +30,9 @@ import android.widget.FrameLayout;
 import android.widget.ImageView;
 import android.widget.TextView;
 import com.google.android.exoplayer2.C;
-import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayerLibraryInfo;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Timeline;
-import com.google.android.exoplayer2.source.TrackGroupArray;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.util.Assertions;
 import com.google.android.exoplayer2.util.RepeatModeUtil;
 import com.google.android.exoplayer2.util.Util;
@@ -1046,8 +1042,8 @@ public class PlaybackControlView extends FrameLayout {
     return true;
   }
 
-  private final class ComponentListener implements Player.EventListener, TimeBar.OnScrubListener,
+  private final class ComponentListener extends Player.DefaultEventListener implements
-      OnClickListener {
+      TimeBar.OnScrubListener, OnClickListener {
 
     @Override
     public void onScrubStart(TimeBar timeBar, long position) {
@@ -1095,11 +1091,6 @@ public class PlaybackControlView extends FrameLayout {
       updateProgress();
     }
 
-    @Override
-    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-      // Do nothing.
-    }
-
     @Override
     public void onTimelineChanged(Timeline timeline, Object manifest) {
       updateNavigation();
@@ -1107,21 +1098,6 @@ public class PlaybackControlView extends FrameLayout {
       updateProgress();
     }
 
-    @Override
-    public void onLoadingChanged(boolean isLoading) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onTracksChanged(TrackGroupArray tracks, TrackSelectionArray selections) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPlayerError(ExoPlaybackException error) {
-      // Do nothing.
-    }
-
     @Override
     public void onClick(View view) {
       if (player != null) {

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

@@ -36,11 +36,8 @@ import android.widget.ImageView;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ControlDispatcher;
 import com.google.android.exoplayer2.DefaultControlDispatcher;
-import com.google.android.exoplayer2.ExoPlaybackException;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.SimpleExoPlayer;
-import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.id3.ApicFrame;
 import com.google.android.exoplayer2.source.TrackGroupArray;
@@ -871,8 +868,8 @@ public final class SimpleExoPlayerView extends FrameLayout {
     aspectRatioFrame.setResizeMode(resizeMode);
   }
 
-  private final class ComponentListener implements TextOutput, SimpleExoPlayer.VideoListener,
+  private final class ComponentListener extends Player.DefaultEventListener implements TextOutput,
-      Player.EventListener {
+      SimpleExoPlayer.VideoListener {
 
     // TextOutput implementation
 
@@ -908,46 +905,11 @@ public final class SimpleExoPlayerView extends FrameLayout {
 
     // Player.EventListener implementation
 
-    @Override
-    public void onLoadingChanged(boolean isLoading) {
-      // Do nothing.
-    }
-
     @Override
     public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
       maybeShowController(false);
     }
 
-    @Override
-    public void onRepeatModeChanged(int repeatMode) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPlayerError(ExoPlaybackException e) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-      // Do nothing.
-    }
-
-    @Override
-    public void onTimelineChanged(Timeline timeline, Object manifest) {
-      // Do nothing.
-    }
-
   }
 
 }

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

@@ -18,17 +18,13 @@ package com.google.android.exoplayer2.testutil;
 import android.os.Handler;
 import android.util.Log;
 import android.view.Surface;
-import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayer;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.source.MediaSource;
-import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.testutil.ActionSchedule.ActionNode;
 import com.google.android.exoplayer2.trackselection.MappingTrackSelector;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 
 /**
  * Base class for actions to perform during playback tests.
@@ -326,7 +322,7 @@ public abstract class Action {
     protected void doActionAndScheduleNextImpl(final SimpleExoPlayer player,
         final MappingTrackSelector trackSelector, final Surface surface, final Handler handler,
         final ActionNode nextAction) {
-      PlayerListener listener = new PlayerListener() {
+      Player.EventListener listener = new Player.DefaultEventListener() {
         @Override
         public void onTimelineChanged(Timeline timeline, Object manifest) {
           if (timeline.equals(expectedTimeline)) {
@@ -351,7 +347,7 @@ public abstract class Action {
   }
 
   /**
-   * Waits for {@link Player.EventListener#onPositionDiscontinuity()}.
+   * Waits for {@link Player.EventListener#onPositionDiscontinuity(int)}.
    */
   public static final class WaitForPositionDiscontinuity extends Action {
 
@@ -366,7 +362,7 @@ public abstract class Action {
     protected void doActionAndScheduleNextImpl(final SimpleExoPlayer player,
         final MappingTrackSelector trackSelector, final Surface surface, final Handler handler,
         final ActionNode nextAction) {
-      player.addListener(new PlayerListener() {
+      player.addListener(new Player.DefaultEventListener() {
         @Override
         public void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
           player.removeListener(this);
@@ -406,54 +402,4 @@ public abstract class Action {
 
   }
 
-  /** Listener implementation used for overriding. Does nothing. */
-  private static class PlayerListener implements Player.EventListener {
-
-    @Override
-    public void onTimelineChanged(Timeline timeline, Object manifest) {
-
-    }
-
-    @Override
-    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
-
-    }
-
-    @Override
-    public void onLoadingChanged(boolean isLoading) {
-
-    }
-
-    @Override
-    public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
-
-    }
-
-    @Override
-    public void onRepeatModeChanged(@ExoPlayer.RepeatMode int repeatMode) {
-
-    }
-
-    @Override
-    public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
-
-    }
-
-    @Override
-    public void onPlayerError(ExoPlaybackException error) {
-
-    }
-
-    @Override
-    public void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
-
-    }
-
-    @Override
-    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-
-    }
-
-  }
-
 }

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

@@ -25,23 +25,19 @@ import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayer;
 import com.google.android.exoplayer2.ExoPlayerFactory;
 import com.google.android.exoplayer2.Format;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.RenderersFactory;
 import com.google.android.exoplayer2.SimpleExoPlayer;
-import com.google.android.exoplayer2.Timeline;
 import com.google.android.exoplayer2.audio.AudioRendererEventListener;
 import com.google.android.exoplayer2.audio.AudioTrack;
 import com.google.android.exoplayer2.decoder.DecoderCounters;
 import com.google.android.exoplayer2.drm.DrmSessionManager;
 import com.google.android.exoplayer2.drm.FrameworkMediaCrypto;
 import com.google.android.exoplayer2.source.MediaSource;
-import com.google.android.exoplayer2.source.TrackGroupArray;
 import com.google.android.exoplayer2.testutil.HostActivity.HostedTest;
 import com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection;
 import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
 import com.google.android.exoplayer2.trackselection.MappingTrackSelector;
-import com.google.android.exoplayer2.trackselection.TrackSelectionArray;
 import com.google.android.exoplayer2.upstream.BandwidthMeter;
 import com.google.android.exoplayer2.upstream.DataSource;
 import com.google.android.exoplayer2.upstream.DefaultBandwidthMeter;
@@ -53,7 +49,7 @@ import junit.framework.Assert;
 /**
  * A {@link HostedTest} for {@link ExoPlayer} playback tests.
  */
-public abstract class ExoHostedTest implements HostedTest, Player.EventListener,
+public abstract class ExoHostedTest extends Player.DefaultEventListener implements HostedTest,
     AudioRendererEventListener, VideoRendererEventListener {
 
   static {
@@ -203,16 +199,6 @@ public abstract class ExoHostedTest implements HostedTest, Player.EventListener,
 
   // Player.EventListener
 
-  @Override
-  public void onLoadingChanged(boolean isLoading) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
-    // Do nothing.
-  }
-
   @Override
   public final void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
     Log.d(tag, "state [" + playWhenReady + ", " + playbackState + "]");
@@ -230,16 +216,6 @@ public abstract class ExoHostedTest implements HostedTest, Player.EventListener,
     this.playing = playing;
   }
 
-  @Override
-  public void onRepeatModeChanged(int repeatMode) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
-    // Do nothing.
-  }
-
   @Override
   public final void onPlayerError(ExoPlaybackException error) {
     playerWasPrepared = true;
@@ -247,21 +223,6 @@ public abstract class ExoHostedTest implements HostedTest, Player.EventListener,
     onPlayerErrorInternal(error);
   }
 
-  @Override
-  public final void onPositionDiscontinuity(@Player.DiscontinuityReason int reason) {
-    // Do nothing.
-  }
-
-  @Override
-  public final void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-    // Do nothing.
-  }
-
-  @Override
-  public final void onTimelineChanged(Timeline timeline, Object manifest) {
-    // Do nothing.
-  }
-
   // AudioRendererEventListener
 
   @Override

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

@@ -22,7 +22,6 @@ import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlayerFactory;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.LoadControl;
-import com.google.android.exoplayer2.PlaybackParameters;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Renderer;
 import com.google.android.exoplayer2.RenderersFactory;
@@ -49,7 +48,7 @@ import junit.framework.Assert;
 /**
  * Helper class to run an ExoPlayer test.
  */
-public final class ExoPlayerTestRunner implements Player.EventListener {
+public final class ExoPlayerTestRunner extends Player.DefaultEventListener {
 
   /**
    * Builder to set-up a {@link ExoPlayerTestRunner}. Default fake implementations will be used for
@@ -341,11 +340,6 @@ public final class ExoPlayerTestRunner implements Player.EventListener {
     this.trackGroups = trackGroups;
   }
 
-  @Override
-  public void onLoadingChanged(boolean isLoading) {
-    // Do nothing.
-  }
-
   @Override
   public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
     if (periodIndices.isEmpty() && playbackState == Player.STATE_READY) {
@@ -358,16 +352,6 @@ public final class ExoPlayerTestRunner implements Player.EventListener {
     }
   }
 
-  @Override
-  public void onRepeatModeChanged(@Player.RepeatMode int repeatMode) {
-    // Do nothing.
-  }
-
-  @Override
-  public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) {
-    // Do nothing.
-  }
-
   @Override
   public void onPlayerError(ExoPlaybackException error) {
     handleException(exception);
@@ -379,9 +363,4 @@ public final class ExoPlayerTestRunner implements Player.EventListener {
     periodIndices.add(player.getCurrentPeriodIndex());
   }
 
-  @Override
-  public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {
-    // Do nothing.
-  }
-
 }