What is the best way to handle the case where drawing takes a few
seconds? I need to put up some sort of progress dialog while I work on
building the screen.
On Nov 6, 11:18 am, Romain Guy <romain...@android.com> wrote:
> You should NEVER create or draw Views from a background thread. The UI
> toolkit (and the framework in general) is not thread safe.
>
> On Sat, Nov 6, 2010 at 10:21 AM, Bret Foreman <bret.fore...@gmail.com>wrote:
>
>
>
> > It takes some time to draw my views so I want to put up a progress
> > dialog while I do it. I set up the code like this:
>
> > public class MyActivityClass {
>
> > �...@override
> > protected void onCreate(Bundle savedInstanceState) {
> > super.onCreate(savedInstanceState);
> > setContentView( R.layout.myView );
> > doBuild(savedInstanceState);
> > }
>
> > protected void doBuild( Bundle savedInstanceState ){
> > showDialog(drawingProgressDialogId);
> > ScreenBuilder builder = new ScreenBuilder();
> > builder.execute(savedInstanceState);
> > }
>
> > private class ScreenBuilder extends AsyncTask<Bundle , Integer ,
> > LinearLayout > {
>
> > �...@override
> > protected LinearLayout doInBackground(Bundle... SIS) {
> > LinearLayout topLevelLayout = new
> > LinearLayout(MyActivityClass.this);
> > doDraw( SIS[0] , topLevelLayout ); // Adds a bunch of
> > child views
> > return topLevelLayout;
> > }
> > �...@override
> > protected void onPostExecute(LinearLayout topLevelLayout) {
> > dismissDialog(drawingProgressDialogId);
> > setContentView(topLevelLayout);
> > super.onPostExecute(topLevelLayout);
> > }
> > }
> > }
>
> > This works the first time through, where savedInstanceState is null.
> > But when there is a configuration change, like rotation and
> > savedInstanceState is not null, the dismissDialog call does not work.
> > The progress dialog remains on the screen. This is true even if doDraw
> > is stubbed so that I'm not doing anything with the savedInstanceState.
>
> > Any ideas why this behavior might occur?
>
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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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