title: notifyDataSetChanged() in Fragment is not refreshing listview
body: <p>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.</p>
  
  <p>The items are fetched but my only problem is that the listview is not updated: here's my code so far:</p>
  
  <pre><code>@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&lt;?&gt; 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;
  }
  </code></pre>
  
  <p>Now - in the AsynkTask in the onPostExecute method - i notify the adapter like this:</p>
  
  <pre><code>communityMembers.addAll(newMembers);
  getActivity().runOnUiThread(new Runnable() {
      @Override
      public void run() {
      nameOrderedAdapter.addAll(communityMembers);
      nameOrderedAdapter.notifyDataSetChanged();
      }
    });
  </code></pre>
  
  <p>but the listview doesn't refresh - only if I go back and reopen the activity - the new data is shown.</p>
  
  <p>So how can I notify the adapter that there's new data to display? </p>