code: @NonNull
      private View.OnClickListener createFinishButtonListener() {
          return new View.OnClickListener() {
  
              @Override
              public void onClick(final View v) {
                  notifyOnFinish();
              }
  
          };
      }
docs: Returns a listener, which allows to finish the last step, when the activity is used as a
  wizard.
  
  @return The listener, which has been created, as an instance of the type {@link
  View.OnClickListener}. The listener may not be null