I should mention this is on a Nexus One with aOS 2.2.2 in case that matters.
Yes, I looked all over that code and even down into AsbListView. It actually registers an internal instance member with the adapter, and the notify call does seem to make it to the observer as far as I can see, but there doesn't seem to be any code that connected the observer and the ListView. I was digging down that far in the first place because I was sure (three times over, I rewrote it from scratch three times using different examples and tutorials besides my first attempt from memory) that I had correctly implemented the Adapter and set it on the ListView. The list view simply never called the adapter after the notify method was called. I know that because I used the basic print- to-log when called technique of tracing the calls. The Adapter would get properly called when first set on the ListView but after that no amount of data change and notify calls would cause it to re-read the adapter, which is what I expect it to do if I notify it that my data has changed. I the end I simply created a new adapter and reset it on the ListView, which seems to be working, however that's broken IMO. I think the next step should be that I write up a quick demo app that attempts replicate the problem. If it doesn't do anything except demonstrate what I'm seeing, then it should allow others to test as well. I'll see if I can make time tomorrow for that. BTW - That link seems to not be visible to me :) must be on your internal network. - Brill Pappin On Jan 26, 12:35 am, Dianne Hackborn <[email protected]> wrote: > 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;... > > > > > > > > > > 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%2Bunsubs > > [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
