AlarmManager triggers only the first time even when set to repeating

Question

I am trying to figure this out for a while now.
In my activity I have set an alarm manager to trigger every 2 mins(for testing) and invoke a service via a receiver. The service is suppose to make network calls etc.

My problem is the AlarmManager triggers the first time correctly but never triggers it again. What did I miss?

In my activity I do this -

        //Register an alarm manager
        //If no alarm is set
        Intent alarmIntent = new Intent(context, AlarmReceiver.class);
        alarmIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, alarmIntent, 0);

        if(!defaultSharedPref.getBoolean("isAlarmSet",false)){
            AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
          manager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                    SystemClock.elapsedRealtime(),
                    R.string.interval,
                    pendingIntent);
            editor = defaultSharedPref.edit();
            editor.putBoolean("isAlarmSet",true);
            editor.commit();
        }

In my manifest:-

<receiver android:process=":remote" android:name=".receiver.AlarmReceiver" />

<service android:name=".service.AlarmService"/>

My receiver :-

public class AlarmReceiver extends WakefulBroadcastReceiver{

    @Override
    public void onReceive(Context context, Intent intent) {
        Intent i = new Intent(context, AlarmService.class);
        startWakefulService(context,i);
    }
}

I even tried the "setRepeating" but no luck. It still triggers only once. Can someone point out where I missed something?

Thanks in advance.

Answer 1

As the interval for your repeating timer you are giving a resource id - R.string.interval. This doesn't make sense, but will compile since it's an integer. If you want your interval as a resource, you'd be better of using an integer resource, but the most crucial change you need is to pass the actual value of the resource rather than the resource id . So for this, use Resources.getInteger or getString.

This should work, however I encourage you not to use a string resource at all:

manager.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, 
    SystemClock.elapsedRealtime(),
    Integer.parseInt(getResources().getString(R.string.interval)), 
    pendingIntent);`

The reason you aren't seeing any triggered alarms in practice is that resource ids are very large integers, typically in the 0x8000000 range, so you're effectively setting a recurrent alarm with a very very long interval. If you wait for a month or so, the alarm would be triggered. :-)

Answer 2

如果您想以更灵活的方式安排作业，我建议您使用该库为您摘要使用的计划程序： https : //github.com/evernote/android-job