Update, the ListView in question is in activity A which is inside tab activity C. Tab activity C inherits from tab activity B. Removing the inheritance of tab activity C from B fixed the problem. C was calling TabActivity.getTabHost().clearAllTabs() to replace the parents tabs in onCreate(). Also, moving the tab construction to a separate method did not fix the problem. So it looks like I will have to keep to a single level of inheritance for activities. :(
-Dan On Feb 24, 10:25 am, Dan <[email protected]> wrote: > I don't know how soon I'll be able to do that but something that is a > few steps easier is for Google and AOSP to release a tag of the Java > code used in the simulators. > > On Feb 23, 8:59 pm, fernando <[email protected]> wrote: > > > > > > > > > i can't see what could be wrong, except if the notifyDataSetChanged is > > overridden in your adapter, then somewhere in your adapter you need to > > call super.notifyDataSetChanged. > > If that's not true that would be really useful to step into the > > frameworks code to undestand what's wrong. You'll need a linux > > machine/box or mac, get the android open source code setup the > > building environment, compile the sdk, run the compiled emulator and > > debug on it. For the debugging environment, use Eclipse and ADT, > > create a plain Java project, link the frameworks/base/core/java > > directory after you get the open source code (contains the listview > > source code). (You'll be installing your apk into the compiled > > emulator ). Then, link this project to your application's project and > > debug your application. Then press F5 to step into the list :-) > > >http://android.git.kernel.org/ -> on the top of the page, shows how > > to get the git repositoryhttp://source.android.com/source/download.html > > ->instructions to > > setup the environment and compile the > > sdkhttp://source.android.com/source/git-repo.html -> git basic > > instructions. > > you can use the "sun virtual box" to host linux if you have a windows > > computer > > > Besides the time spent to download the tools (linux, python, java, > > etc, virtual box, etc) the open source code and compilation (which you > > can let it doing), it should take less than 2 hours of work to do all > > of it. > > > I hope you can find what's going on as quick as possible. Then tell > > us what happened (I'm curious) > > > thanks > > - Fernando > > > On Feb 23, 6:20 pm, Dan <[email protected]> wrote: > > > > I have been working on a similar issue to this. The application is > > > uses a ListActivity from a Library Project. This Library Project can > > > also be configured to be its own application (refactoring is in > > > progress). The ListActivity works well when its project is used as an > > > application. However the ListView is always empty when it is used from > > > a library project. The only difference is the data to be displayed. > > > I have tried different Adapters, with Maps and Cursors and using > > > setAdapter(), none of these have worked. > > > > I am working on API level 7. My attempts at a test application has not > > > resulted in a replication of this bug. I am banging my head against > > > the wall here. It would help to be able to debug into the framework to > > > see what I am doing wrong. > > > > -Dan > > > > On Jan 25, 10:33 pm, Brill Pappin <[email protected]> wrote: > > > > > 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
