code: @NonNull
      private View.OnClickListener createBackButtonListener() {
          return new View.OnClickListener() {
  
              @Override
              public void onClick(final View v) {
                  if (navigationFragment != null) {
                      int currentIndex = navigationFragment.getSelectedNavigationPreferenceIndex();
  
                      if (currentIndex > 0) {
                          Bundle params = notifyOnPreviousStep();
  
                          if (params != null) {
                              navigationFragment.selectNavigationPreference(currentIndex - 1, params);
                          }
                      }
                  }
              }
  
          };
      }
docs: Returns a listener, which allows to resume to the previous 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