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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