How to make Alarm Manager work when Android 6.0 in Doze mode?

Put the application in whitelist only allows network in doze mode. AlarmManager does not affected by whitelist.

For setExactAndAllowWhileIdle() method please check the below description from SDK. It will not wake the phone from doze.

When the alarm is dispatched, the app will also be added to the system's temporary whitelist for approximately 10 seconds to allow that application to acquire further wake locks in which to complete its work.

Doze and App Standby definitely change the behavior in regards to alarms and wakelocks, but they're definitely not the end of the world for you!

Have you tried using the method setAlarmclock() instead of set()? It's designed specifically for alarm clocks and may be able to cut through doze. There are a few adb commands you can use to manually put a phone into doze or app standby mode: https://developer.android.com/preview/features/power-mgmt.html

If that isn't able to wake your app up, there's the surefire method setExactAndAllowWhileIdle() is designed to wake the phone from doze no matter what. Worst case scenario, you can wake your app up with this method and use the wakeup to schedule the next alarm.

Another page worth a read is this blog post with its flowchart for background work and alarms: https://plus.google.com/+AndroidDevelopers/posts/GdNrQciPwqo