I did it in this way and it work fine for me.
Create a class and Call it something like ScheduledService it extends IntentService, in this class you'll do what you want to do when alarm goes off.
public class ScheduledService extends IntentService {
public ScheduledService() {
super("My service");
}
@Override
protected void onHandleIntent(Intent intent) {
//Do something, fire a notification or whatever you want to do here
Log.d("debug", "Ring Rind !");
}
}
then in you activity to start the alarm use the following:
AlarmManager mgr = (AlarmManager) YourActivity.getSystemService(Context.ALARM_SERVICE);
Intent i = new Intent(YourActivity, ScheduledService.class);
PendingIntent pi = PendingIntent.getService(YourActivity, 0, i, 0);
mgr.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + PERIOD, pi);
Which PERIOD is after how much milliseconds you want the alarm to goes off.
To cancel stop the timer and cancel the alarm use:
if (mgr != null)
mgr.cancel(pi);
Finally for all this to work you need to register your ScheduledService class as a Service.
In your manifest add this tou your application:
<application
... />
...
<service android:name=".ScheduledService" >
</service>
</application>
This way the Android OS will take care of firing the alarm when it's time. even if other application is running or even if your app process is terminated.
Hope this help.
Regards.
Just a crazy idea: Create an activity and set it's theme to be fullscreen with no title bar and a button to stop the alarm maybe, instead of doing a notification just make an intent that starts that activity "maybe you will need This" to work even when phone is locked and play some annoying sounds, "This" may help, when the activity starts. you can also override the onBackPressed() to do nothing.
