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