I am working on a app locker which has some background services (to lock apps). I am using Xiaomi Redmi Note 4g for the development. The MIUI has an in-built task manager which can be used to kill running apps. When I kill apps with this, all services, broadcastreceivers and alarmmanagers are getting removed (as expected from a task manager). My requirement is to prevent my background services from getting cleared from task-killers, but if the user navigates to settings and force closes, the service should stop. How do I achieve this?
Btw, I know that its not impossible to achieve this since Whatsapp and Truedialer (some egs) are already doing this on the latest android versions.
My observations from Whatsapp:
- I kill the app from the task manager
- All services in Whatsapp are stopped except for "MessagingService"
- The list view of the running apps show status as "Restarting"
- "AlarmService" service starts up (not sure if MessagingService is starting it or from an AlarmManager)
- After a time lag, all services are up and running
Note: The timer on the MessagingService isn't reset and it still keeps on ticking. But if I force stop the service, its not started again until I manually fire the app.
Similar observations are made for TrueDialer.
I have tried to replicate this with START_STICKY, AlarmManager, BroadcastReceiver, but was unsuccessful. Can someone help me on this? I just want to understand how Whatsapp is achieving this. Feel free to ask if you need more info.
I've solved the problem.
Solution for MIUI 7.0 => Security => Autostart => select Apps that you want to run in background => Reboot After reboot your device should able to run your application services in background like other android devices do.
来源：https://stackoverflow.com/questions/31558866/restarting-killed-stopped-by-task-killers-services-in-android-like-whatsapp