Refreshing ArrayAdapter onResume [notifyDataSetChanged() not working]

android, android-arrayadapter, fragment, refresh

Solution

the issue you're having is that you're overwriting the entries reference and it's not getting changed on the adapter. Here's how you can fix this

@Override
public void onResume() {

    super.onResume();
    entries.clear();
    entries.addAll(contactStorage.getContactListNames());
    adapter.notifyDataSetChanged();
    Log.d(TAG, "List Frag Resumed");

}

this is a common mistake to make, it's caused because when you first create a list (in memory) and your `entries` field points to that, you then tell the `adapter` to look at that memory location when you create it, but `onResume` you create a new list in memory (when you get the contact list names again) and you tell entries to point to that new list in memory, what you need to do is replace the entries in the original list with the entries in the new list, that way the `adapter` will still reference the same list.

Problem

I am creating a contact list app using Fragments where one frag is a list of names in the contact list and the other is the rest of the details. Here is the class that displays the list of names ``` public class MyListFragment extends ListFragment { private ContactStorage contactStorage = new ContactStorage(); public final static String TAG = "FRAGMENTS"; private MainActivity parent; ArrayAdapter<String> adapter; ArrayList<String> entries = new ArrayList<String>(); String array[]; public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.list_layout, null); parent = (MainActivity) getActivity(); entries = contactStorage.getContactListNames(); adapter = new ArrayAdapter<String>(getActivity().getApplicationContext(), android.R.layout.simple_list_item_1, entries); setListAdapter(adapter); Log.d(TAG, "Adapter created"); array = contactStorage.getContactDetails(); return v; } @Override public void onResume() { super.onResume(); entries = contactStorage.getContactListNames(); adapter.notifyDataSetChanged(); Log.d(TAG, "List Frag Resumed"); } } ``` The problem I am having is that the ArrayAdapter does not refresh on resume. When the screen is rotated, its fine as onCreateView() is ran again, but I need it to refresh onResume. I have looked over this site loads and found nothing but "use notifyDataSetChanged()" which doesn't work.

Original source