Android: how to refresh ListView contents?

Question

My ListView is using an extension of BaseAdapter, I can not get it to refresh properly. When I refresh, it appears that the old data draws on top

Answer 1

You don't have to create a new adapter to update your ListView's contents. Simply store your Adapter in a field and update your list with the following code:

mAdapter.setList(yourNewList);
mAdapter.notifyDataSetChanged();

---

To clarify that, your Activity should look like that:

private YourAdapter mAdapter;

protected void onCreate(...) {

    ...

    mAdapter = new YourAdapter(this);
    setListAdapter(mAdapter);

    updateData();
}

private void updateData() {
    List<Data> newData = getYourNewData();
    mAdapter.setList(yourNewList);
    mAdapter.notifyDataSetChanged();
}

Answer 2

I'm doing the same thing using invalidateViews() and that works for me. If you want it to invalidate immediately you could try calling postInvalidate after calling invalidateViews.

Answer 3

Another easy way:

//In your ListViewActivity:
public void refreshListView() {
    listAdapter = new ListAdapter(this);
    setListAdapter(listAdapter);
}