class ContactListFragment extends ListFragment {
    private List<Contact> mContacts;
    private BroadcastReceiver mReceiver;
    
    @Override
    public void onCreate(...) {
        super.onCreate(...);
        setRetainInstance(true);
    }
    
    @Override
    public void onViewCreated(...) {
        super.onViewCreated(...);
        if (mContacts == null) {
            Intent i = new Intent(getActivity(), HttpService.class);
...