RemoteControlClient.OnPlaybackPositionUpdateListener

Called on the implementer to notify it that the playback head should be set at the given position. If the position can be changed from its current value, the implementor of the interface must also update the playback position using setPlaybackState(int, long, float) to reflect the actual new position being used, regardless of whether it differs from the requested position. Failure to do so would cause the system to not know the new actual playback position, and user interface components would fail to show the user where playback resumed after the position was updated.