code: private void notifyAdditionalOnScrollStateChangedListener(AbsListView view, int scrollState) {
          if (mAdditionalOnScrollListener != null) {
              mAdditionalOnScrollListener.onScrollStateChanged(view, scrollState);
          }
      }
docs: Notifies the OnScrollListener of an onScrollStateChanged event, since JazzyListView is the primary listener for onScrollStateChanged events.