Android Question search example of a timer that does not stop when the smartphone is off

[john mad doe]

Hello

For an app like a stopwatch, I need a timer that does not stop when the smartphone goes to sleep (screen off).

I understood that I had to launch a service to create the timer, but the problem is that it stops about 30 seconds after the smartphone goes to sleep.

I read that I had to write instructions like Service.AutomaticForegroundMode=Service.AUTOMATIC_FOREGROUND_ALWAYS but it doesn't solve my problem.

In fact I didn't really understand what to do, so I'm looking for an example.


Thanks for your help.

 

[hatzisn]

Use PhoneWakeState of Phone library. I don't remember the name of the method since I have closed the computer but it is the other than the method that keeps your screen from shutting off.

 

[Biswajit]

Check this tutorial how to use a background service that will run until you stop it manually

Background location tracking

Simple example of a foreground service that keeps the process running in the background. The current location is shown in the persistent notification. The app starts at boot and theoretically should run all the time. It also schedules itself to run with StartServiceAt. This can help in cases...

www.b4x.com

 

[JohnC]

For apps that don't need to wake up the device (like a stopwatch app), one idea is to store the start time of the stopwatch in a file, then the device could even power completely off, and when your app runs again, it will simply calculate and display the time that pasted since the stored start time.