@Nullable
    @Override
    public View onCreateView(
        LayoutInflater inflater,
        @Nullable ViewGroup container,
        @Nullable Bundle savedInstanceState) {
      Bundle args = getArguments();
      int contentLayoutId = args.getInt(ARG_LAYOUT_ID);
      return inflater.inflate(contentLayoutId, container, false);
    }
This fragment show the layout specified with ID in the {@code ARG_LAYOUT_ID} argument.
java/com/google/android/apps/authenticator/howitworks/HowItWorksActivity.java