/**
  * perform UI after refresh
  *
  * @param frame
  */
 @Override
 public void onUIRefreshComplete(PtrFrameLayout frame) {
   mDrawable.stop();
 }
 /**
  * When the content view has reached top and refresh has been completed, view will be reset.
  *
  * @param frame
  */
 @Override
 public void onUIReset(PtrFrameLayout frame) {
   mScale = 1f;
   mDrawable.stop();
 }