code: public final void onResume(@NonNull final Object serviceListener) {
          logd("onResume");
          mServiceListener = serviceListener;
          mState = State.RESUMED;
  
          if (!mStoredResults.isEmpty()) {
              logd("has undelivered results");
              final List<SoftReference<OperationDelivery<?>>> oldResults = new ArrayList<>(
                      mStoredResults);
              mStoredResults.clear();
              for (SoftReference<OperationDelivery<?>> result : oldResults) {
                  final OperationDelivery<?> delivery = result.get();
                  if (delivery != null) {
                      deliverResult(delivery);
                  }
              }
              logd("no more undelivered results");
          } else {
              logd("has no undelivered results");
          }
      }
docs: This method must be called by a bound GUI element when it passes its own onResume state.
  
  @param serviceListener a GUI element that wants to connect to Chronos via the
  ServiceConnector. In fact, it could be any object, no matter it is an
  Activity, Fragment, or something else, but Chronos is designed to work
  with GUI elements.
  @see #onPause()