code: private boolean notifyOnFinish(final int index) {
          boolean result = true;
  
          for (WizardListener listener : wizardListeners) {
              result &= listener.onFinish(index, viewPagerAdapter.getItem(index));
          }
  
          return result;
      }
docs: Notifies all listeners, when the last fragment is about to be finished.
  
  @param index
  The index of the fragment, which is about to be finished, as an {@link Integer}
  value
  @return True, if the last fragment is allowed to be finished, false otherwise