code: protected void notifyCallback(@NonNull final List<Integer> dismissedPositions) {
          if (!dismissedPositions.isEmpty()) {
              Collections.sort(dismissedPositions, Collections.reverseOrder());
  
              int[] dismissPositions = new int[dismissedPositions.size()];
              int i = 0;
              for (Integer dismissedPosition : dismissedPositions) {
                  dismissPositions[i] = dismissedPosition;
                  i++;
              }
              mCallback.onDismiss(getListViewWrapper().getListView(), dismissPositions);
          }
      }
docs: Notifies the {@link OnDismissCallback} of dismissed items.
  
  @param dismissedPositions the positions that have been dismissed.