Stop a service after MainActivity is closed (EDITED)

Question

I think im not clear at all, i do want the service to persist even if the main activity is destroyed via user action or android system does it, it does it well, but when the app

Answer 1

Maybe all you need to do is check to see if it's null before attempting to stop it:

private void stopBg(){
     if(BgServiceIntent != null)
         stopService(BgServiceIntent);
}

Answer 2

If the service already running in background then you need to call stopSelf() on same instance of that service . Now as per service life Cycle onCreate() only call once in the lifetime of service . WhereAs onStartCommand get called each time you call startService() with new intent. So what you can do is to pass a flag in intent to stop it .

Intent BgServiceIntent = new Intent(MainActivity.this, BgScanService.class);
    BgServiceIntent.putExtra("close",true);
    startService(BgServiceIntent);

And in Service .

 @Override
public int onStartCommand(Intent intent, int flags, int startId) {
    boolean shouldClose=intent.getBooleanExtra("close",false);
    if(shouldClose){
        stopSelf();
    } else {
        // Continue to action here
    }
    return START_STICKY;
}

Answer 3

First of all start a service in START_NOT_STICKY.
Override this method in your Service

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return START_NOT_STICKY;
}

and add this in your MainActivity.class

@override
private onDestroy() {
    stopService(YourActiveService);
    finishAffinity();
    super.onDestroy()
}