What are the reasons for the delay in Android Service?

Question

Android

Good afternoon,
Such a problem:
There is a service that sends notifications (notification) on a schedule, during operation, if the device is inactive, there are delays in the service. That is, notifications are late, and the delay depends on the time of inactivity.
Inside the service, there is an infinite loop in the child thread that checks the condition:
if(date.before(new Date())) { ... }(as well as whether a notification has already been sent)
The problem is that if the device is inactive for several hours, then notifications do not come at all.
Thank you!

Answer 1

Good afternoon,
Just a cycle in the service is not enough, the device needs to be woken up after it has fallen asleep. I think this is done so that the services do not plant the battery while the device is turned off.

Answer 2

You need to pull WakeLock .
If the service is started from a BroadcastReceiver, use WakefulBroadcastReceiver