Question

I do use this code for refill ListView with data after they change

// ListView lv;
// MyListAdapter la;
// DataClass dc;
dc.remove(object_id);
lv.setAdapter(la);

Is this the best way since we can’t use notifyDataSetChanged() which is available only in ArrayAdapter ?

Solution

 //MyListAdapter.java

private ArrayList<DataSetObserver> observers = new ArrayList<DataSetObserver>();

public void registerDataSetObserver(DataSetObserver arg0) {
    observers.add(arg0);
}

public void unregisterDataSetObserver(DataSetObserver arg0) {
    observers.remove(arg0);
}

public void notifyDataSetChange() {
    for (DataSetObserver d : observers) {
        d.onChanged();
    }
}

public void remove(int position) {
    [DataClass object].remove(position);
    notifyDataSetChange();
} 

Answer 1

For a CursorAdapter I use the following code:

mAdapter.getCursor().requery();

If you are using custom adapter or as you commented: only want ListAdapter as member variable. Instead of using private CustomAdapter mAdapter; (which i would recommended to avoid creating unnecessary objects).

You can use DataSetObserver part and ListAdapter.registerDataSetObserver(DataSetObserver observer). DataSetObserver.onChanged() will be called by the BaseAdapter implementation, so it should work for all adapter.

BaseAdapter.notifyDataSetChanged():

public void notifyDataSetChanged() {
    mDataSetObservable.notifyChanged();
}