Thanks all for responding. This has been most helpful!
On Thu, Nov 19, 2009 at 8:49 PM, Romain Guy <romain...@google.com> wrote:
> ListView does everything on the UI thrad.
>
> > I am pretty sure the adapter in this app is not being modified outside of
> > the UI thread but I can cause the exception to be thrown.
>
> Modifying the data structure(s) that backs the adapter on a background
> thread could cause this.
>
> >
> > Thanks,
> >
> > On Thu, Nov 19, 2009 at 2:24 PM, Dianne Hackborn <hack...@android.com>
> > wrote:
> >>
> >> As the exception says:
> >>
> >> throw new IllegalStateException("The content of the
> >> adapter has changed but "
> >> + "ListView did not receive a notification. Make
> >> sure the content of "
> >> + "your adapter is not modified from a
> background
> >> thread, but only "
> >> + "from the UI thread. [in ListView(" + getId()
> +
> >> ", " + getClass()
> >> + ") with Adapter(" + mAdapter.getClass() +
> ")]");
> >>
> >> You can't modify an adapter from a background thread; this must be done
> on
> >> the main thread.
> >>
> >> This exception is not adding a restriction; it is making it more obvious
> >> when you do something that would always break in weird, subtle, and/or
> >> horrible ways.
> >>
> >> On Thu, Nov 19, 2009 at 5:56 AM, WoodManEXP <woodman...@gmail.com>
> wrote:
> >>>
> >>> For Google about BaseAdapter class
> >>>
> >>> In Android 1.6 and 2.0 the BaseAdapter class has apparently been
> >>> modified to throw an exception when it sees the Adapter.getCount()
> >>> method return a number different than what it picked up when
> >>> BaseAdapter.notifyDataSetChanged() was called (at least I did not
> >>> observe this behavior in pre 1.6).
> >>>
> >>> So now the question is, when should one call notifyDataSetChanged() or
> >>> more importantly, when can the count in the Adapter be safely changed?
> >>>
> >>> Consider the case of an app with a background thread delivering data
> >>> to a BaseAdapter at a rate faster than the ListView responds to
> >>> notifyDataSetChanged(). Because notifyDataSetChanged() is a
> >>> synchronous call and the ListView updates are taking place sometime in
> >>> the indeterminate future on the UI thread, how can an app know when it
> >>> is safe to change the adapter count?
> >>>
> >>> If the app changes the count while the ListView is updating itself the
> >>> exception will be thrown (and there is no way to catch the exception).
> >>>
> >>> Is there a way to know when it is safe to change the count in the
> >>> BaseAdapter?
> >>>
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> >>
> >>
> >>
> >> --
> >> Dianne Hackborn
> >> Android framework engineer
> >> hack...@android.com
> >>
> >> 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.
> >>
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> >
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>
>
> --
> 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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