public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
     // other createView stuff
     
     RetainedFragment fragment;
     if ((fragment = RetainedFragment.find(getFragmentManager(), TAG_RETAINED_FRAGMENT)) != null) {
          retrievedObject = fragment.get(TAG_RETAINED_FRAGMENT_ITEM);
     }
     
     // more createView stuff
}

public void onSaveInstanceState(Bundle outState) {
    // save instance state stuff
    
    RetainedFragment fragment = RetainedFragment.create(getFragmentManager(), TAG_RETAINED_FRAGMENT);
    fragment.put(TAG_RETAINED_FRAGMENT_ITEM, storedObject);
    
    // more save instance state stuff
}