Storing fragments to deal with screen rotation changes

Question

I have an application that is composed of one activity and 3 fragments. The activity creates a menu with buttons that create the appropriate fragments. My code works perfectly without screen rotations, but it breaks when I rotate the screen.

My first attempt did not include a setRetainInstance(true) call when creating the fragments. The issue that I found with that is that after replacing fragments twice (one fragment remains on the back stack), if I rotate the screen, I get a null pointer exception in the fragment that is not currently displayed. Edit: Just a note, the null pointer exception is in the setOnItemClickListener call shown below. lv is declared in the onCreateView() method.

My second attempt, I included a setRetainInstance(true) call when creating the fragments. This solved the first issue. However, one of my fragments is a ListFragment, and when I rotate the screen, the OnItemClickListener does not seem to be set anymore. Here is my code for setting the listener:

ListAdapter adapter = new SimpleAdapter(getActivity(),
        gameslist, R.layout.list_object,
        new String[] { TAG_ID, TAG_NAME, TAG_LOCATION, TAG_CREATED },
        new int[] { R.id.id, R.id.name, R.id.location, R.id.created_date });
setListAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> arg0,
                View arg1, int position, long arg3) {
            // ...
        }
});

Any ideas or solutions to this problem? Is my understanding of how to design with fragments just completely off?

Thanks for any help!

edit: also, just for my understanding, where in the code are the fragments being recreated? They are not in the oncreate() function of my activity. Thanks!

Figured it out! I was calling the AsyncTask in the onCreate() function, which was being called when the screen was rotated. However, I was declaring lv in the onCreateView() function, which would not be called until the view is created. Nullpointerexception!

Answer 1

do you have onCreate(...) and onResume() and onCreateView(...) implemented in your fragment?

Which one of the three is that adapter code in?