Difference between 'setExact' and 'setAlarmClock'

Question

In my application which was supposed to trigger an alarm at a specified time, alarm whose purpose was to inform the user via a Notification, I despaired at obta

Answer 1

Doze mode, introduced in Android 6.0 (API level 23), adds further restrictions to those outlined above: (TL;DR: only setAlarmClock triggers in doze mode, and adds a system icon)

Doze restrictions

The following restrictions apply to your apps while in Doze: [...]

• The system ignores wake locks.
• Standard AlarmManager alarms (including setExact() and setWindow()) are deferred to the next maintenance window.
  • If you need to set alarms that fire while in Doze, use setAndAllowWhileIdle() or setExactAndAllowWhileIdle().
  • Alarms set with setAlarmClock() continue to fire normally — the system exits Doze shortly before those alarms fire. [...]

The devices enter the low-power doze-state with periodic wake-ups to perform the other alarms etc.