shadows/framework/src/main/java/org/robolectric/shadows/ShadowMediaPlayer.java
@Implementation
  protected void _release() {
    checkStateException("release()", allStates);
    doStop();
    state = END;
    handler.removeMessages(MEDIA_EVENT);
  }
@Implementation
  protected void _release() {
    checkStateException("release()", allStates);
    doStop();
    state = END;
    handler.removeMessages(MEDIA_EVENT);
  }
Simulates call to {@link MediaPlayer#_release()}. Calls {@link #doStop()} to suspend playback
event callbacks and sets the state to END.