Generally it is a better idea to use views as your tabs instead of activities...
On Thu, Feb 24, 2011 at 4:14 PM, Dan <[email protected]> wrote: > 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 > -- 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
