code: public void showProgress(final int id, final int sofar, final int total) {
          final T notification = get(id);
  
          if (notification == null) {
              return;
          }
  
          notification.updateStatus(FileDownloadStatus.progress);
          notification.update(sofar, total);
      }
docs: Show the notification with the exact progress.
  
  @param id    The download id.
  @param sofar The downloaded bytes so far.
  @param total The total bytes of this task.