@Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   if (getArguments() != null) {
     mParam1 = getArguments().getInt(ARG_PARAM1);
   }
 }
 @Override
 public void onAttach(Activity activity) {
   super.onAttach(activity);
   try {
     mListener = (OnOnboardingOptionSelectedListener) activity;
   } catch (ClassCastException e) {
     throw new ClassCastException(
         activity.toString() + " must implement OnOnboardingOptionSelectedListener");
   }
 }
 @Override
 public void onDetach() {
   super.onDetach();
   mListener = null;
 }