add more stubs to make exoplayer not crash

src/api-impl/android/media/session/MediaController.java

@@ -0,0 +1,13 @@
+package android.media.session;
+
+import android.content.Context;
+import android.media.MediaMetadata;
+
+public class MediaController {
+
+	public MediaController(Context context, MediaSession.Token token) {}
+
+	public MediaMetadata getMetadata() {
+		return new MediaMetadata();
+	}
+}

src/api-impl/android/media/session/MediaSession.java

@@ -0,0 +1,40 @@
+package android.media.session;
+
+import java.util.List;
+
+import android.app.PendingIntent;
+import android.content.Context;
+import android.media.MediaDescription;
+import android.media.MediaMetadata;
+import android.os.Handler;
+
+public class MediaSession {
+
+	public static final class Token {}
+
+	public static abstract class Callback {}
+
+	public static class QueueItem {
+		public QueueItem(MediaDescription description, long id) {}
+	}
+
+	public MediaSession(Context context, String tag) {}
+
+	public Token getSessionToken() {
+		return new Token();
+	}
+
+	public void setFlags(int flags) {}
+
+	public void setCallback(Callback callback, Handler handler) {}
+
+	public void setMediaButtonReceiver(PendingIntent pendingIntent)	{}
+
+	public void setActive(boolean active) {}
+
+	public void setPlaybackState(PlaybackState state) {}
+
+	public void setMetadata(MediaMetadata metadata) {}
+
+	public void setQueue(List<QueueItem> queue) {}
+}

src/api-impl/android/media/session/PlaybackState.java

@@ -0,0 +1,23 @@
+package android.media.session;
+
+public class PlaybackState {
+
+	public class Builder {
+
+		public Builder setState(int state, long position, float playbackSpeed, long updateTime) {return this;}
+
+		public Builder setBufferedPosition(long bufferedPosition) {return this;}
+
+		public Builder setActions(long actions) {return this;}
+
+		public Builder setErrorMessage(CharSequence errorMessage) {return this;}
+
+		public Builder setActiveQueueItemId(long activeQueueItemId) {return this;}
+
+		public PlaybackState build() {
+			return new PlaybackState();
+		}
+
+	}
+
+}