Hi,
You can use threads but all the views, and all the views related APIs,
must be invoked from the main thread (also called UI thread.) To do
this from a background thread, you need to use a Handler. A Handler is
an object that will post messages back to the UI thread for you. You
can also use the various post() method from the View class as they
will use a Handler automatically. In your case, you could do something
like this:
private Handler mHandler;
protected void onCreate(Bundle saved) {
mHandler = new Handler();
}
// In your Thread
public void run() {
// ...
mHandler.post(new Runnable() {
public void run() { popup.dismiss(); }
});
}
You can also look at the class called UserTask from the
apps-for-android project:
http://code.google.com/p/apps-for-android/source/browse/trunk/Photostream/src/com/google/android/photostream/UserTask.java
It makes threading/UI interactions even easier.
On Mon, Oct 6, 2008 at 8:25 AM, Falko Richter <[EMAIL PROTECTED]> wrote:
> Hello everyone,
>
> I first have a general question if threaded programming is possible with the
> Android Platform?
>
> Secondly I have a specific problem. I have an application that gives the
> user feedback with a "PopupWindow". By standart the Popup disappears then
> the user clicks somewhere on the screen. I want to make the popup
> automatically after X millisecond, so I programmed myself a little thread:
>
> package com.fon;
> import android.util.Log;
>
> public class PopupThread extends Thread {
> fonPopupWindow popup;
> long millis;
>
> public PopupThread(fonPopupWindow popup) {
> this.popup = popup;
> }
>
> public void run() {
> try {
> sleep(millis);
> popup.dismiss();
> }
> catch(InterruptedException e) {
> }
> }
> }
>
> but everytime the thread tries to dismiss my popup, I get the following
> exception:
>
> android.view.ViewRoot$CalledFromWrongThreadException: Only the original
> thread that created a view hierarchy can touch its views.
>
> From what I understand, this tells me that I cannot access something outside
> the new created Thread, and therefore my plan is immpossible to solve on
> Android.
>
> Thx for suggestions
>
> Falko
>
> >
>
--
Romain Guy
www.curious-creature.org
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
-~----------~----~----~----~------~----~------~--~---
