Android AlarmManager setExact() is not exact

Question

I need to plan sheduled task every 10 minutes.

As in Lollipop and higher version setRepeating() is inexact, I use setExact() and (on alarm

Answer 1

To answer the question on the system alarm...

Android's stock Alarm Clock/Desk Clock app uses a combination of setAlarmClock and setExactAndAllowWhileIdle.

The following code is used to update notifications:

final PendingIntent operation = PendingIntent.getBroadcast(context, 0, 
    AlarmStateManager.createIndicatorIntent(context), flags);
final AlarmClockInfo info = new AlarmClockInfo(alarmTime, viewIntent);

alarmManager.setAlarmClock(info, operation);

While at the same time the following code is used to schedule the actual alarm:

if (Utils.isMOrLater()) {
    // Ensure the alarm fires even if the device is dozing.
    alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, timeInMillis, pendingIntent);
} else {
    alarmManager.setExact(AlarmManager.RTC_WAKEUP, timeInMillis, pendingIntent)
}

The Pending intent set in setExactAndAllowWhileIdle triggers the alarm while setAlarmClock's intent is then simply ignored.

Android Googlesource