If you want to update your listview doesn't matter if you want to do that on onResume()
, onCreate()
or in some other function, first thing that you have to realize is that you won't need to create a new instance of the adapter, just populate the arrays with your data again.
The idea is something similar to this :
private ArrayList<String> titles;
private MyListAdapter adapter;
private ListView myListView;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
myListView = (ListView) findViewById(R.id.my_list);
titles = new ArrayList<String>()
for(int i =0; i<20;i++){
titles.add("Title "+i);
}
adapter = new MyListAdapter(this, titles);
myListView.setAdapter(adapter);
}
@Override
public void onResume(){
super.onResume();
// first clear the items and populate the new items
titles.clear();
for(int i =0; i<20;i++){
titles.add("New Title "+i);
}
adapter.notifySetDataChanged();
}
So depending on that answer you should use the same List<Item>
in your Fragment
. In your first adapter initialization you fill your list with the items and set adapter to your listview. After that in every change in your items you have to clear the values from the main List<Item> items
and than populate it again with your new items and call notifySetDataChanged();
.
That's how it works : ).