I still have some question on it. If I put the backgroundWork() in
another thread, how can the main UI thread know background thread has
finished? And how to pause the main UI thread to wait for
backgroundWork().
On Mar 25, 12:44 pm, Marco Nelissen <marc...@android.com> wrote:
> The problem is that your 'backgroundWork()" method is not actually
> running in the background, but in the main UI thread. You'll need to
> do the work in a separate thread.
>
> On Tue, Mar 24, 2009 at 8:02 PM, guishenl...@gmail.com
>
>
>
> <guishenl...@gmail.com> wrote:
>
> > I want to show a ProgressBar while doing some background operation,
> > but my code seems not to work. I hope someone can help me to solve
> > this problem. Thank you in advance!Here is my code and explanation :
>
> > public boolean onMenuItemSelected(int featureId, MenuItem item) {
> > switch(item.getItemId()) {
> > case CASEONE_ID:
> > ProgressBar progress = (ProgressBar)findViewById
> > (R.id.ProgressBar);
> > progress.setVisibility(View.VISIBLE);
> > progress.bringToFront();
> > progress.invalidate();
>
> > backgroundWork();
>
> > progress.setVisibility(View.GONE);
> > progress.invalidate();
> > return true;
> > }
> > return super.onMenuItemSelected(featureId, item);
> > }/*In fact I never see the progressbar by this code, instead the
> > program will keep frozen until backgroundWork() finish. But what I
> > want is the progressbar can appear in the screen while backgroungWork
> > () is being processed.
>
> > private void backgroundWork(){
> > for(int i=0;i<1E8;i++);
> > }/*This is not the exact work I did in my own program. I change it to
> > this form is just to tell you my operation will occupy the processor
> > for long time.*/- Hide quoted text -
>
> - Show quoted text -
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers-unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
-~----------~----~----~----~------~----~------~--~---
