code: public T remove(final int id) {
          final T n = get(id);
          if (n != null) {
              notificationArray.remove(id);
              return n;
          }
  
          return null;
      }
docs: Remove the {@link BaseNotificationItem} by the download id.
  
  @param id The download id.
  @return The removed {@link BaseNotificationItem}.