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How to Set Recurring AlarmManager to execute code daily

Asked 2010-12-13T16:11:29.163
16

I am currently trying to write alarm manager that will make an alarm go off within a specified period of time, daily. First I check to see if the user has had an alarm set for that for that day:

      if ((User.getReminderTime(Home.this) > 0)
    && (dt.getDate() != today.getDate() || dt.getDay() != today
      .getDay())) {
   AppointmentManager.setFutureAppointmentCheck(this
     .getApplicationContext());
   User.setLongSetting(this, "futureappts", today.getTime());
  }

Then I go and set the actual alarm to go off between 12 and 12:10 of the next day:

     public static void setFutureAppointmentCheck(Context con) {
  AlarmManager am = (AlarmManager) con
    .getSystemService(Context.ALARM_SERVICE);

  Date futureDate = new Date(new Date().getTime() + 86400000);
  Random generator = new Random();

  futureDate.setHours(0);
  futureDate.setMinutes(generator.nextInt(10));
  futureDate.setSeconds(0);

  Intent intent = new Intent(con, FutureAppointmentReciever.class);

  PendingIntent sender = PendingIntent.getBroadcast(con, 0, intent,
    PendingIntent.FLAG_ONE_SHOT);

  am.set(AlarmManager.RTC_WAKEUP, futureDate.getTime(), sender);

 }

Now I setup a test environment for this to go off every two minutes and it seems to be working fine, however when I deploy to an actual device, the reciever does not seem to be recieving the alarms. I thought it might be an issue with the device being asleep, so I added the power manager. But it still does not work:

      PowerManager pm = (PowerManager) context
    .getSystemService(Context.POWER_SERVICE);
  PowerManager.WakeLock wl = pm.newWakeLock(
    PowerManager.PARTIAL_WAKE_LOCK, "keepAlive");
  wl.acquire();
  setFutureAppointments(context.getApplicationContext());
  AppointmentManager.setFutureAppointmentCheck(context
    .getApplicationContext());
  User.setLongSetting(context.getApplicationContext(), "futureappts",
    new
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43

I usually do something more along the lines of:

Intent i = new Intent(this, MyService.class);
PendingIntent pi = PendingIntent.getService(this, 0, i, 0);
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.cancel(pi); // cancel any existing alarms
am.setInexactRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
    SystemClock.elapsedRealtime() + AlarmManager.INTERVAL_DAY,
    AlarmManager.INTERVAL_DAY, pi);

This way, you don't have to worry about re-setting the AlarmManager in your Service.

I usually run this bit of code when my app starts (onResume in my main activity) and in a BroadcastReceiver that is set up to receive BOOT_COMPLETED.

I've written a guide on creating Services and using the AlarmManager, which is based on my own experience and a few tips & tricks I picked off from watching a Google I/O talk. If you're interested, you can read it here.

To answer your question below, all I can do is quote the docs:

public void setInexactRepeating (int type, long triggerAtTime, long interval, PendingIntent operation)

Schedule a repeating alarm that has inexact trigger time requirements; for example, an alarm that repeats every hour, but not necessarily at the top of every hour. These alarms are more power-efficient than the strict recurrences supplied by setRepeating(int, long, long, PendingIntent), since the system can adjust alarms' phase to cause them to fire simultaneously, avoiding waking the device from sleep more than necessary.

Your alarm's first trigger will not be before the requested time, but it might not occur for alm

answered 2010-12-13T16:36:17.613

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