Merge "MediaSession2: Remove initialization in library session impl constructor"

    public static class MediaLibrarySessionImpl extends MediaSession2Impl

            implements MediaLibrarySessionProvider {

        private final MediaLibrarySessionCallback mCallback;

        public MediaLibrarySessionImpl(Context context,

                MediaPlayerInterface player, String id, VolumeProvider2 volumeProvider,

                int ratingType, PendingIntent sessionActivity, Executor callbackExecutor,

                MediaLibrarySessionCallback callback) {

            super(context, player, id, volumeProvider, ratingType, sessionActivity,

                    callbackExecutor, callback);

            mCallback = callback;

            // Don't put any extra initialization here. Here's the reason.

            // System service will recognize this session inside of the super constructor and would

            // connect to this session assuming that initialization is finished. However, if any

            // initialization logic is here, calls from the server would fail.

            // see: MediaSession2Stub#connect()

        }

        @Override

        @Override

        MediaLibrarySessionCallback getCallback() {

            // Equivalent to the (MediaLibrarySessionCallback) super.getCallback().

            return mCallback;

            return (MediaLibrarySessionCallback) super.getCallback();

        }

        @Override