ab11 ab11 - 3 months ago 7
Android Question

Android: how to refresh ListView contents?

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 of the new data, until a scroll event happens. The old rows draw on top of the new rows, but the old rows disappear when I start scrolling.

I have tried calling
invalidateViews()
,
notifyDataSetChanged()
, and
notifyDataSetInvalidated()
. My code looks something like:

private void updateData()
{
List<DataItems> newList = getNewList();

MyAdapter adapter = new MyAdapter(getContext());
//my adapter holds an internal list of DataItems
adapter.setList(newList);
mList.setAdapter(adapter);
adapter.notifyDataSetChanged();
mList.invalidateViews();
}

Answer

To those still having problems, I solved it this way:

List<Item> newItems = databaseHandler.getItems();
ListArrayAdapter.clear();
ListArrayAdapter.addAll(newItems);
ListArrayAdapter.notifyDataSetChanged();
databaseHandler.close();

I first cleared the data from the adapter, then added the new collection of items, and only then set notifyDataSetChanged(); This was not clear for me at first, so I wanted to point this out. Take note that without calling notifyDataSetChanged() the view won't be updated.