/* (non-Javadoc)
  * @see com.baidu.mapapi.ItemizedOverlay#setFocus(Item)
  */
 @Override
 public void setFocus(Item item) {
   super.setFocus(item);
   currentFocusedIndex = getLastFocusedIndex();
   currentFocusedItem = item;
   if (currentFocusedItem == null) {
     hideBalloon();
   } else {
     createAndDisplayBalloonOverlay();
   }
 }