Android: why did the Alarm notification stop after system reboot

Question

I am developing an android application that should fire an alarm five times a day:
- the times in each day is not constant
- after the alarm is fired I will schedule th

Answer 1

why did the Alarm notification stop after system reboot

Because alarm schedules are cleared on a reboot. If you want to have your alarms pick up again after a reboot, you will need to implement a BroadcastReceiver that responds to the RECEIVE_BOOT_COMPLETED broadcast. The demo/ project in my WakefulIntentService repo demonstrates this.