> In my background thread if I add < 100 elements to the array,
> everything works great. If
> I add more than 300 though I get the crash. Is this capacity related.
No, this is related to the use of threads. Even adding 1 element could
cause the crash. You just cannot really predict the behavior. That's
why this exception was added, to help you write your apps correctly.
Otherwise your app would look like it's working except in some cases
bad things would happen (crash in the UI toolkit, surprising behavior
in the UI, etc.)
> How are we supposed to populate an array list associated with an array
> adapter when we are
> grabbing stuff out of the database in a background thread? Do we just
> do the database read in
> the background and then process the results from the cursors in the UI
> thread?
That's a possibility. You could also just use a CursorAdapter. You
could also use an AsyncTask and add new elements to the array using
publishProgress() every X elements processed.
>
> Very best regards
>
> pawpaw17
>
> in OnCreate...
> if (aa == null){
> aa = new myArrayAdapter(this);
> }
> lList.setAdapter(aa);
>
> Thread thread = new Thread(null, doSearchDatabase,
> "Background");
> thread.start();
> }
>
> myArrayAdapter aa = null;
> final ArrayList<MyStats> myArrayList = new ArrayList<MyStats>();
>
> class myArrayAdapter extends ArrayAdapter {
> Activity context;
> myArrayAdapter(Activity context) {
> super(context, R.layout.caloriesrow, myArrayList);
> this.context=context;
> }
>
> On Oct 11, 1:36 pm, Romain Guy <romain...@google.com> wrote:
>> --> myArrayList.add(i, new CalStats(name, extra, calories));
>>
>> if that's the array list used by your adapter then you are modifying
>> it outside of the UI thread.
>>
>>
>>
>>
>>
>> On Sun, Oct 11, 2009 at 11:07 AM, ccfrazier2 <georgefraz...@yahoo.com> wrote:
>>
>> > Yeah, it's the main thread of my app, here's the stack:
>>
>> > myApp [Android Application]
>> > myApp [Android Application]
>> > DalvikVM[localhost:8613]
>> > Thread [<3> main] (Suspended (exception
>> > IllegalStateException))
>> > Thread [<15> Binder Thread #3] (Running)
>> > Thread [<13> Binder Thread #2] (Running)
>> > Thread [<11> Binder Thread #1] (Running)
>>
>> > Thread [<3> main] (Suspended (exception IllegalStateException))
>> > ListView.layoutChildren() line: 1596
>> > ListView(AbsListView).onLayout(boolean, int, int, int, int) line:
>> > 1112
>> > ListView(View).layout(int, int, int, int) line: 6569
>> > LinearLayout.setChildFrame(View, int, int, int, int) line: 1119
>> > LinearLayout.layoutVertical() line: 998
>> > LinearLayout.onLayout(boolean, int, int, int, int) line: 918
>> > LinearLayout(View).layout(int, int, int, int) line: 6569
>> > FrameLayout.onLayout(boolean, int, int, int, int) line: 333
>> > FrameLayout(View).layout(int, int, int, int) line: 6569
>> > LinearLayout.setChildFrame(View, int, int, int, int) line: 1119
>> > LinearLayout.layoutVertical() line: 998
>> > LinearLayout.onLayout(boolean, int, int, int, int) line: 918
>> > LinearLayout(View).layout(int, int, int, int) line: 6569
>> > PhoneWindow$DecorView(FrameLayout).onLayout(boolean, int, int, int,
>> > int) line: 333
>> > PhoneWindow$DecorView(View).layout(int, int, int, int) line: 6569
>> > ViewRoot.performTraversals() line: 979
>> > ViewRoot.handleMessage(Message) line: 1613
>> > ViewRoot(Handler).dispatchMessage(Message) line: 99
>> > Looper.loop() line: 123
>> > ActivityThread.main(String[]) line: 4203
>> > Method.invokeNative(Object, Object[], Class, Class[], Class, int,
>> > boolean) line: not available [native method]
>> > Method.invoke(Object, Object...) line: 521
>> > ZygoteInit$MethodAndArgsCaller.run() line: 791
>> > ZygoteInit.main(String[]) line: 549
>> > NativeStart.main(String[]) line: not available [native method]
>>
>> > None of my code in this stack.
>>
>> > Any thoughts on how to track this down? I'm sure I'm doing something
>> > wrong - but it was never a problem
>> > as far as I knew running with 1.5.
>>
>> > I spawn a thread at the end of "OnCreate" in my Activity that reads
>> > values from a database and populates
>> > the listView. The database reading is done in the worker thread, and I
>> > sort the list and tell the arrayadapter
>> > to notify tht the list has changed in a routine that gets called from
>> > my handler, ie I post at the end of the run
>> > method of the worker thread so I can notify the array adapter from the
>> > UI thread.
>>
>> > private void fillList(){
>> > Collections.sort(myArrayList);
>> > // aa is an arrayAdapter
>> > aa.notifyDataSetChanged();
>> > }
>>
>> > Thanks for any thoughts you guys have on this.
>>
>> > Very best,
>>
>> > pawpaw17
>>
>> > On Oct 11, 10:20 am, RichardC <richard.crit...@googlemail.com> wrote:
>> >> When you get the error, can you see from the traceback which thread
>> >> you are in?
>>
>> >> --
>> >> RichardC
>>
>> >> On Oct 11, 4:06 pm, ccfrazier2 <georgefraz...@yahoo.com> wrote:
>>
>> >> > Romain,
>>
>> >> > thanks for confirming that this message is new in 1.6.
>>
>> >> > Actually, I mean to write "I'm sure my adapter mods are IN the UI
>> >> > thread, not the background thread". Anything else that can cause this?
>>
>> >> > If I step through the code in the debugger I don't get the exception,
>> >> > but I I run without stepping I do. Also, when I run the phone on
>> >> > the app, I can get it to "work" 3 or 4 times, and then eventually I'll
>> >> > get the force close.
>>
>> >> > Can anything else cause this?
>>
>> >> > Here's my code in the background thread:
>>
>> >> > public void run(){
>> >> > int i = 0;
>> >> > lsDb.openDataBase();
>> >> > rescursor = lsDb.Search();
>> >> > if (rescursor.getCount() > 0){
>> >> > id_index = rescursor.getColumnIndex("_id");
>> >> > name_index = rescursor.getColumnIndex("Name");
>> >> > calories_index =
>> >> > rescursor.getColumnIndex("Calories");
>> >> > extra_index = rescursor.getColumnIndex("sodium");
>> >> > }
>> >> > if (rescursor.moveToFirst()){
>> >> > do {
>> >> > int id = rescursor.getInt(id_index);
>> >> > String name =
>> >> > rescursor.getString(name_index);
>> >> > int calories =
>> >> > rescursor.getInt(calories_index);
>> >> > double extra=
>> >> > rescursor.getDouble(extra_index);
>> >> > // add
>> >> > to array list
>> >> > myArrayList.add(i, new CalStats(name,
>> >> > extra, calories));
>> >> > i++;
>> >> > }
>> >> > while (rescursor.moveToNext());
>> >> > }
>> >> > rescursor.close();
>> >> > lsDb.close();
>> >> > hh.post(postdoSearchDatabase);
>> >> > }
>>
>> >> > The "post" at the end is to a handler. I **do** modify the adapter in
>> >> > the run method there.
>>
>> >> > On Oct 11, 1:36 am, Romain Guy <romain...@google.com> wrote:
>>
>> >> > > It's not a bug, it's a message that was added to notify app developers
>> >> > > of applications that are doing the wrong thing.
>>
>> >> > > > I'm sure my adapter mods are not in the UI thread.
>>
>> >> > > Which is exactly the problem.
>>
>> >> > > --
>> >> > > Romain Guy
>> >> > > Android framework engineer
>> >> > > romain...@android.com
>>
>> >> > > Note: please don't send private questions to me, as I don't have time
>> >> > > to provide private support. All such questions should be posted on
>> >> > > public forums, where I and others can see and answer them- Hide
>> >> > > quoted text -
>>
>> >> - Show quoted text -
>>
>> --
>> Romain Guy
>> Android framework engineer
>> romain...@android.com
>>
>> Note: please don't send private questions to me, as I don't have time
>> to provide private support. All such questions should be posted on
>> public forums, where I and others can see and answer them- Hide quoted text -
>>
>> - Show quoted text -
> >
>
--
Romain Guy
Android framework engineer
romain...@android.com
Note: please don't send private questions to me, as I don't have time
to provide private support. All such questions should be posted on
public forums, where I and others can see and answer them
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