AsbListView and ListView call registerDataSetObserver() on the adapter. BaseAdapter.notifyDataSetChanged() does the notification to whoever is registered with it.
Here is working code, the Running Services UI in settings, that implements a BaseAdapter and uses notifyDataSetChanged() to tell the list view when its contents change: http://android.git.kernel.org/?p=platform/packages/apps/Settings.git;a=blob;f=src/com/android/settings/applications/RunningProcessesView.java;h=86457bf8b7e42b003ea64ea39762ae9927881c83;hb=HEAD#l363 On Tue, Jan 25, 2011 at 8:37 PM, Brill Pappin <[email protected]> wrote: > I just searched the forums, and apparently this is a common problem. > > ListView with a custom adapter based on BaseAdapter. > Its backed by a List object. > > The problem is that updating the data and calling notifyDataSetChanged(); > does nothing. > I have modified the adapter so that ever method that is called in it prints > itself to the console. > > my adapter has a method that does the update of the contents and attempts > to notify: > > public void updateData(List<Event> data) { > > this.data.clear(); > > this.data.addAll(data); > > notifyDataSetChanged(); > > } > > > The problem is that after notifyDataSetChanged() is called, the list never > calls any other methods, not even getCount(). > > My data has changed, and i've notified ListView that it has, yet it still > refuses to update. > > > After some investigation in the OS source, I don't see where the observer > in the list actually tells the list to update. > > It seems the only way to get the list to update its elements is to re-set > the adapter on it with the new element set. > > > Now I've seen many threads in the group saying that they user was doing > something wrong... but I don't see how the notify is going to update the > list period (change or no change). > > > So, I think i'm dealing with a bug here. > > > Can someone actually find the code that does the update in the ListVIew > when adapters notifyDataSetChanged() is called? > > > - Brill Pappin > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- Dianne Hackborn Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
