If you have created a separate thread to do work in the background
independent from the UI, you wouldn't want to be doing UI in that
thread. :) Also, you can only do UI in a thread that is running a
message loop, NOT just a random thread you have spawned (though you
should get an exception thrown back if you try to do this).
I think you probably want to send a message to the original UI thread
and have it display the dialog there. You can just post a Runnable to
the UI thread which takes care of displaying the dialog when its run()
method is called.
On Sep 8, 9:16 am, CG <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I am facing a strange issue. I suppose it is due to my bad
> understanding of processes and compatibilities with processes.
>
> So here is the behavior I'd like to have :
> When I open my map, actions are done in background.
> So I use a progress dialog. For that I need an separate thread.
> But if an error occurs, I'd like to display a warning pop up. This
> popup show request is done inside the run method of the separated
> thread.
>
> And the warning dialog is never displayed ! I don't understand why.
> Can anyone explain me what is wrong ?
> I join my code snippet to give a picture of what i try to do.
>
> I also check the API demo and try to override the method
> OnCreateDialog method but with the same result :-(
>
> I suppose the issue is "when" I call the show().
>
> ----------------- Code snippet
> public class StationNearActivity extends MapActivity implements
> OnClickListener, Runnable {
>
> /** Called when the activity is first created. */
> public void onCreate(Bundle icicle) {
>
> pgd = ProgressDialog.show(this, null,
> getString(R.string.nearest_station_progress_dialog_wait));
>
> /*------------------------
> I create the dialog here
> -------------------------*/
> AlertDialog.Builder builder = new AlertDialog.Builder(this);
>
> builder.setMessage(R.string.nearest_station_gm__popup_no_address_found_label);
> dlg = builder.create();
>
> /*------------------------------
> if I display it there then it works ! But it is not the correct
> behaviour
> dlg.show()
> -----------------------------*/
>
> super.onCreate(icicle);
> thisInstance = this;
>
> mapViewFromXML.setClickable(true);
> mapViewFromXML.setEnabled(true);
>
> }
>
> Thread threadOfMap = new Thread(this);
> threadOfMap.start();
> }
>
> public void run() {
> Looper.prepare();
>
> try {
> Thread.sleep(200);
> } catch (InterruptedException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
>
> // --- Fill the map
> try {
> setMapCenter();
> if (mapCenter == null || (mapCenter.getLatitudeE6() == 0
> && mapCenter.getLongitudeE6() == 0)) {
>
> /*------------------------------
> The "progress dialog dismiss" works but the "dialog show" not !
> -----------------------------*/
>
> pgd.dismiss();
> dlg.show();
> }
>
> Log.d("MAP", "add overlay");
> //....
> mapViewFromXML.postInvalidate();
>
> } catch (Exception e) {
> Log.e(Constant.LOG_NS2_MAP, e.toString(), e);
> } finally {
> pgd.dismiss();
> }
> }
>
> }
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