CODEWITHSUNDEEP
androidlistviewandroid-fragments
Alin
Alin

Reputation: 1044

notifyDataSetChanged() in Fragment is not refreshing listview

I'm trying to display a list of items fetched from a url but I only want to fetch 20 of them at a time... so I've implemented an OnScrollListener to fetch the items when the users is on the last item of the listview.

The items are fetched but my only problem is that the listview is not updated: here's my code so far:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    parentView = inflater.inflate(R.layout.activity_event_speakers_alphabetically, container,false);
    listView = (ListView) parentView
            .findViewById(R.id.speakersAlphabeticallyActivityList);
    nameOrderedMembers.addDataBatch(communityMembers);
    nameOrderedAdapter = DelegateViewStateAdapterFactory
            .makeUserListAdapter(getActivity(),
                    nameOrderedMembers.getSortedData(), DelegateViewStateAdapterFactory.OrderType.NAME);
    listView.setAdapter(nameOrderedAdapter);
    AQuery aQuery = new AQuery(listView);
    aQuery.id(R.id.speakersAlphabeticallyActivityList).scrolled(new EndlessScrollListener());
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                                long arg3) {
            if (nameOrderedAdapter.getItem(arg2) instanceof User) {
                User u = (User) nameOrderedAdapter.getItem(arg2);
                Intent i = new Intent(getActivity(),
                        UserProfileFragmentActivity.class);
                startActivity(i);
            }
        }
    });

    return parentView;
}

Now - in the AsynkTask in the onPostExecute method - i notify the adapter like this:

communityMembers.addAll(newMembers);
getActivity().runOnUiThread(new Runnable() {
    @Override
    public void run() {
    nameOrderedAdapter.addAll(communityMembers);
    nameOrderedAdapter.notifyDataSetChanged();
    }
  });

but the listview doesn't refresh - only if I go back and reopen the activity - the new data is shown.

So how can I notify the adapter that there's new data to display?

Upvotes: 8

Views: 14687

Answers (3)

Ahmad Vatani
Ahmad Vatani

Reputation: 1670

add below line after nameOrderedAdapter.notifyDataSetChanged(); :

listView.setAdapter(nameOrderedAdapter);

Upvotes: 3

Chetan Joshi
Chetan Joshi

Reputation: 5711

use

notifyDataSetInvalidated()

method if you are using any custom ListView or Custom GridView like / HorizontalListView

Upvotes: 0

Autocrab
Autocrab

Reputation: 3757

call listView.invalidateViews() after notifyDataSetChanged()

Upvotes: 6

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