Hello good people,
I have an expandable list view with a static array for the group data
and an SQLite database for the child data. It is implemented with the
BaseExpandableListAdapter and works great, except, when I edit the
database to delete or add children to the list I do not see the
changes onscreen. It looks like I can use the registerDataSetObserver
method to notify the adapter and expandable list of a data change.
What I have to do in the callback to make Android redraw the list
after data changes is what I need to know. Can I do it?
Documentation on this part of the SDK is a bit sparse and expandable
list view example code is not a good match. Can anyone offer advice
on how to use a DataSetObserver? It feels like I have to switch over
to a Cursor type adapter. Any insight is most welcome.
Pardon the double post to Android Beginners.
Best regards,
Beth
On Jul 27, 2:48 pm, Beth Mezias <emez...@gmail.com> wrote:
> Hi there,
>
> Here is the situation. In a TabbedView, one of three tabs is an
> ExpandableListViewActivity. My application is using SQL Lite to store the
> data bound to the ExpandableListView. When I change the SQL Lite data in
> another activity, I need to refresh the ExpandableListView and show the new
> data. If I am drawing the tab for the first time after adding new data, the
> list shows correctly after the tab switch. If I am in the
> ExpandableListViewActivity when I add new data to the list or edit existing
> data, then I do not see the change. In this case, when I exit the
> application and restart, I see the modified data was stored in SQL Lite as
> expected. Can anyone suggest how I might get the tab to redraw the list?
>
> The partially working code looks like this:
> @Override
> protected void onActivityResult(int requestCode, int resultCode, Intent
> intent) {
> super.onActivityResult(requestCode, resultCode, intent);
> //stuff deleted
> if((requestCode == EDITOR) && resultCode==RESULT_OK) {
> tabs.setCurrentTab(1);
> tabs.getCurrentView().invalidate();
>
> }
>
> }
>
> The constructor for the list adapter is where I execute the code to populate
> the groups and children. Do I want to drop and create a new list adapter?
> That seems like a waste of perfectly good rows. Is it something I should do
> in the ExpandableListViewActivity, rather than the TabHost? The fact that
> this is an expandable list is probably irrelevant; I am stuck where an
> object on the screen that has changed is not redrawn automatically.
> Your help is deeply appreciated.
>
> Best regards,
> Beth
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