public void onIndicatorEvent(int event) {
    switch (event) {
      case OnIndicatorEventListener.EVENT_ENTER_SECOND_LEVEL_INDICATOR_BAR:
        mIndicatorControlBar.startAnimation(mFadeOut);
        mSecondLevelIndicatorControlBar.startAnimation(mSecondLevelFadeIn);
        mSecondLevelIndicatorControlBar.setVisibility(View.VISIBLE);
        break;

      case OnIndicatorEventListener.EVENT_LEAVE_SECOND_LEVEL_INDICATOR_BAR:
        leaveSecondLevelIndicator();
        break;
    }
  }
 private void leaveSecondLevelIndicator() {
   mIndicatorControlBar.startAnimation(mFadeIn);
   mIndicatorControlBar.setVisibility(View.VISIBLE);
   mSecondLevelIndicatorControlBar.startAnimation(mSecondLevelFadeOut);
 }