How to make Service that is unremovable even if killed by the system?

Question

I am creating a Blue light filter app. So that, I want to display the view over all the apps. I did it by the following Service,

public class OverlayService exte         


        

Answer 1

the service must be restarted because android donot allow it. You can use Foreground service to improve your app.

Answer 2

First Create BroadcastReceiver

public class Restarter extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    Log.i("Broadcast Listened", "Service tried to stop");
    Toast.makeText(context, "Service restarted", Toast.LENGTH_SHORT).show();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        context.startForegroundService(new Intent(context, YourService.class));
    } else {
        context.startService(new Intent(context, YourService.class));
    }
 } 
}

Add below code in your service

 @Override
public void onDestroy() {
    super.onDestroy();
    stoptimertask();

    Intent broadcastIntent = new Intent();
    broadcastIntent.setAction("restartservice");
    broadcastIntent.setClass(this, Restarter.class);
    this.sendBroadcast(broadcastIntent);
}



private Timer timer;
private TimerTask timerTask;
public void startTimer() {
    timer = new Timer();
    timerTask = new TimerTask() {
        public void run() {
            Log.i("Count", "=========  "+ (counter++));
        }
    };
    timer.schedule(timerTask, 1000, 1000); //
}

public void stoptimertask() {
    if (timer != null) {
        timer.cancel();
        timer = null;
    }
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

In your MainActivity add below code

public class MainActivity extends AppCompatActivity {
Intent mServiceIntent;
private YourService mYourService;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mYourService = new YourService();
    mServiceIntent = new Intent(this, mYourService.getClass());
    if (!isMyServiceRunning(mYourService.getClass())) {
        startService(mServiceIntent);
    }
}

private boolean isMyServiceRunning(Class<?> serviceClass) {
    ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
    for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
        if (serviceClass.getName().equals(service.service.getClassName())) {
            Log.i ("Service status", "Running");
            return true;
        }
    }
    Log.i ("Service status", "Not running");
    return false;
}


@Override
protected void onDestroy() {
    stopService(mServiceIntent);
    super.onDestroy();
}   }

In Manifest.XML

 <receiver
    android:name="Restarter"
    android:enabled="true"
    android:exported="true">
    <intent-filter>
        <action android:name="restartservice" />
    </intent-filter>
</receiver>

Answer 3

Try this add this method in service class

@Override
public void onTaskRemoved(Intent rootIntent){
    super.onTaskRemoved(rootIntent);
 }