PendingIntent和AlarmManager

Question

I'm trying to broadcast after 20 seconds and receive the broadcast with an extended receiver ExtendedReceiver .

Here is my function that creates an alarm and sets the PendingIntent to go off after 20 seconds:

public void alert() {
    GregorianCalendar cal = new GregorianCalendar();
    cal.add(Calendar.SECOND, 20);

    Intent i = new Intent(this, ExtendedReceiver.class);
    int _uid = (int) System.currentTimeMillis();
    PendingIntent pi = PendingIntent.getBroadcast(this, _uid, i, PendingIntent.FLAG_ONE_SHOT);

    AlarmManager am = (AlarmManager)getSystemService(Activity.ALARM_SERVICE);
    am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), pi);

    Log.i("Title", "Alarm has been set");
}

Here is the ExtendedReceiver class:

public class ExtendedReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("Title", "Broadcast received");
    }
}

I get my first log message: Alarm has been set but I don't get my second log message. I'm unsure where the problem lies (first day on Android)

Answer 1

If i may this is what i always do.

change your

PendingIntent pi = PendingIntent.getBroadcast(this, _uid, i, PendingIntent.FLAG_ONE_SHOT);

to

 PendingIntent pi = PendingIntent.getBroadcast(this, _uid, new Intent(EXTENDED_RECEIVER_ACTION), PendingIntent.FLAG_ONE_SHOT);

and important: Register your ExtendedReceiver like this:

...
registerReceiver(new ExtendedReceiver() , new IntentFilter(EXTENDED_RECEIVER_ACTION));

PS: EXTENDED_RECEIVER_ACTION is a String and dont forget to unregister your receiver.

further docs here

hope it helps :)