Update Android ListActivity when list data changes?

Question

I wanted to know how to refresh a ListActivity when I change/add data to it.

I first thought that ListAdapter would know when the list is changes, but when I have added elements to the list there is no update on the ListActivity , only when I close the ListActivity and reopen it again I see the changes occur.

So I searched for any method such as: update(), refesh() or something like that, but there is none. It seems I haven't gotten the concept, can someone help me please?

Answer 1

If you are using an ArrayAdapter , manipulate the contents of the list through the adapter -- do not touch the underlying list. There are add() , insert() , and remove() methods on ArrayAdapter .

If you are using a CursorAdapter , run a requery() on the Cursor .

Answer 2

Try ArrayAdapter:notifyDataSetChanged
Google docs link

Answer 3

也许你应该这样做setListAdapter(listAdapter);