How to automatically restart a service even if user force close it?

Question

I want a service to run all the time in my application. So I want to restart it even if it is force closed by user. There is definitely a way to do it as apps like facebook

Answer 1

The only real solution for keeping services alive ist to call Service.startForeground(...) with a provided Notification. This will be the only valid solution, every other one will be very dependent on how Google will change the behaviour of it's system. With every API update, Google could prevent every other hack.

This also keeps the user aware, that your app is performing some background task which will keep the app alive and the user has to stop this. If you provide the user the ability to stop it is part of your application, though.

See the Documentation:

void startForeground (int id, Notification notification)

Make this service run in the foreground, supplying the ongoing notification to be shown to the user while in this state. By default services are background, meaning that if the system needs to kill them to reclaim more memory (such as to display a large page in a web browser), they can be killed without too much harm. You can set this flag if killing your service would be disruptive to the user, such as if your service is performing background music playback, so the user would notice if their music stopped playing.