onCreate:
show the progress dialog in the main thread.
spawn your thread
when the thread completes, call dismiss() on the progress dialog from the
Thread using an Handler:
Handler mHandler = new Handler(); in the main thread
mHandler.post(new Runnable() {
@Override
public void run() {
mProgressDialog.dimiss();
}
}); in your thread when it completes.
You can also make intermediate refreshes if the operation is very long, for
example if you use a list view, you can post a refresh when adding a new
element.
Beware, when you call a function in another thread than the main one that
affect the UI, always use the Handler technique.
It should do the trick.
2008/11/7 joshbeck <[EMAIL PROTECTED]>
>
> First, thanks.
> I tried blocking the main thread, and quickly determined it wasn't
> a good idea. Didn't solve anything, but hey at least I know now.
>
> Here's what I'm working on:
> I have an application.
> It downloads a bunch of data and then loads that data into variables
> which
> are used to present the user with an initial display.
>
> If I load the variables and show the display the screen just goes
> black for like
> 20-30 seconds.
>
> If I background the thread, the variables aren't loaded prior to the
> display being drawn.
>
> Ideally, I'd like to use the progressbar to show a loading screen,
> but the loading bar
> doesn't show up unless the primary view is ready.
>
> I'm think the solution is to have the program start an initial
> activity that is small and prompts
> the user for a button press. That button press then activates a thread/
> progress bar which
> in turn uses an intent to open the "primary" view.
>
> Make sense?
>
> If I have two separate activity files working in the same project, can
> I create public variables that are shared?
>
> Thanks,
> Josh Beck
>
>
>
> On Nov 6, 1:44 pm, Guillaume Perrot <[EMAIL PROTECTED]> wrote:
> > You should not use the following in your case but there is a simple
> > way to wait for a thread to complete, it's the Thread.join() function.
> > This should be called only in a background thread which need to
> > synchronize with another background thread for some reason.
> > You should (i'd say must) never call blocking functions in the main
> > thread.
> >
> > On Nov 6, 8:53 am, hackbod <[EMAIL PROTECTED]> wrote:
> >
> > >http://code.google.com/android/intro/appmodel.html
> >
> > > The last section is on threads, though it's strongly recommended you
> > > read the whole thing.
> >
> > > On Nov 5, 9:58 pm, joshbeck <[EMAIL PROTECTED]> wrote:
> >
> > > > I'm fairly new at this and just to the point where threading makes
> > > > sense.
> > > > So, my my main process is also considered a thread?
> >
> > > > True --- False
> >
> > > > I write a simple HelloWorld.java program.
> > > > This program has 1 thread, the main flow of execution.
> >
> > > > ?
> >
> > > > Thanks,
> > > > Josh
> >
> > > > On Nov 5, 7:26 pm, hackbod <[EMAIL PROTECTED]> wrote:
> >
> > > > > If the thread takes a while to complete, your main application
> thread
> > > > > probably shouldn't wait for it to complete... otherwise, what's
> the
> > > > > point of putting that work in the thread, if you're just going to
> > > > > block on it at some point.
> >
> > > > > Instead, consider using a Handler to post a message back to the
> main
> > > > > thread when the background thread has finished its work.
> >
> > > > > On Nov 5, 3:54 pm, joshbeck <[EMAIL PROTECTED]> wrote:
> >
> > > > > > I have a function that utilizes a thread.
> >
> > > > > > A variable the is needed for the program is populated after the
> thread
> > > > > > call is made.
> >
> > > > > > The thread takes a while to complete.
> >
> > > > > > How can I make the program wait for a thread to complete before
> moving
> > > > > > on?
> >
> > > > > > Thanks,
> > > > > > Josh Beck
> >
>
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