How to bring Android existing activity to front via notification

Question

I have one Android application, when it runs a service, I want to show the notification on the status bar. Then the user could navigate to other application by pressing HOME key. However when I try to bring the previous running application back to Front via notification icon, there is some problem with the existing activity. Even I declare it as "Single Top" mode (I want to run the existing activity since there is an associated service running) , somehow that activity's OnDestroy has been called before OnResume. Here is my code of creating the notification object. Could you please point me what wrong it is. Thanks.

private void showNotification ()
{

  Intent toLaunch = new Intent(getApplicationContext(),
                                          MySingleTopActivity.class);

  PendingIntent intentBack = PendingIntent.getActivity(getApplicationContext(),   0,toLaunch, PendingIntent.FLAG_UPDATE_CURRENT);

  notification.setLatestEventInfo(getApplicationContext(),
         getText(R.string.GPS_service_name), text, intentBack);
....
}

Answer 1

private void showNotification() {
    Intent toLaunch = new Intent(getApplicationContext(), MySingleTopActivity.class);

    //add these two lines will solve your issue
    toLaunch.setAction("android.intent.action.MAIN");
    toLaunch.addCategory("android.intent.category.LAUNCHER");

    PendingIntent intentBack = PendingIntent.getActivity(getApplicationContext(), 0, toLaunch, PendingIntent.FLAG_UPDATE_CURRENT);

    notification.setLatestEventInfo(getApplicationContext(), getText(R.string.GPS_service_name), text, intentBack);
    ...
}