android - How to keep a Service alive?

Question

How Whatsapp service keep working in background in huawei phones ?

I removed whatsapp of protected apps but Whatsapp service not closed in screen off time.

I'm writing critical app that need to run every time but my service killed in screen off.

I want to write service like Whatsapp or AirDroid service anyone can explain about that ?

I mean how to write service that specially not close by screen off in HUAWEI phones

This is my service code

AppLifeService

public class AppLifeService extends Service {
@Override
public IBinder onBind(Intent intent) {

    return null;
}



@Override
public void onCreate() {
    super.onCreate();

}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    super.onStartCommand(intent, flags, startId);


    startForeground(5, AppLifeReciever.createNotification(this));


    return  START_STICKY;
}


@Override
public void onDestroy() {


    //startService(new Intent(this, AppLifeService.class)); Updated : not need


    super.onDestroy();

}
}

Answer 1

Service with START_STICKY in retrun onStartCommand() will start again automatically you dont need to start it again in onDestroy()

    @Override
    public void onDestroy() {

      //  startService(new Intent(this, AppLifeService.class));
        super.onDestroy();

    }