android AlarmManager not waking phone up

Question

I want an activity to be displayed at a certain time. For this, I am using AlarmManager. It works fine when the device is awake, but it doesn\'t wake it up if it\'s asleep.<

Answer 1

For Services (maybe works for activity as well), extend your AlarmReceiver from WakefulBroadcastReceiver, it acquires WAKE_LOCK for you while intent is being processed.

WakefulBroadcastReceiver docs - https://developer.android.com/reference/android/support/v4/content/WakefulBroadcastReceiver.html

Keeping device awake guide - https://developer.android.com/training/scheduling/wakelock.html