code: private void handleShowProgressIntent(@NonNull final Bundle extras) {
          if (extras.containsKey(EXTRA_SHOW_PROGRESS)) {
              showProgress(extras.getBoolean(EXTRA_SHOW_PROGRESS));
          }
      }
docs: Handles the intent extra, which specifies, whether the progress should be shown, when the
  activity is used as a wizard, or not.
  
  @param extras
  The extras of the intent, which has been used to start the activity, as an instance
  of the class {@link Bundle}. The bundle may not be null