You need to do this from a message queue / looper thread, such as the main
thread. Just post a message to the main thread and show your toast from
there.
On Wed, Jun 24, 2009 at 12:48 PM, Richard Schilling
richard.rootwirel...@gmail.com wrote:
This is somewhat related to
http://groups.google.com/group/android-developers/browse_thread/thread/e83f452ae9f307b8/cc1a379efbc27b51?lnk=gstq=toast+from+a+thread#cc1a379efbc27b51
I have a service running in the background. I have a background
thread that gets a reference to the service from the application's
main activity. But when the background thread calls a method in the
service to display a toast, I get the Looper not initialized
exception. Why, if I have a valid, bound reference to a Service,
does this still happen?
public MyActivity extends Activity{
private static MyService service;
public static MyService getMyService()
private ServiceConnection sConnection = new ServiceConnection(){
public void onServiceConnected(ComponentName className,
IBinder
service) {
service =
((MyService.MyServiceBinder)service).getService();
}
public void onServiceDisconnected(ComponentName className) {
service = null;
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent bindIntent = new Intent(this, NomadService.class);
bindService(bindIntent, sConnection,
Context.BIND_AUTO_CREATE);
// start the service.
nomadServiceComponent = startService(
new Intent(this, MyService.class));
new MyThread().start();
}
}
public class MyService{
// normal code for MyService omitted for discussion purposes
public void toast(String t){
Context ctx = getApplicationContext();
try{
Toast.makeText(ctx, t, Toast.LENGTH_LONG);
} catch (Throwable th){
Log.i(Nomad, th.getMessage());
th.printStackTrace();
}
}
}
public class MyThread extends Thread{
public void run(){
MyService s = MyActivity.getMyService();
if (s != null)
s.toast(You're toasted.);
// causes this exception to occur: Can't create
handler inside thread that has not called Looper.prepare()
}
}
Richard Schilling
Root Wireless
--
Dianne Hackborn
Android framework engineer
hack...@android.com
Note: please don't send private questions to me, as I don't have time to
provide private support, and so won't reply to such e-mails. All such
questions should be posted on public forums, where I and others can see and
answer them.
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