public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
        if(!isMyServiceRunning(SensorService.class)){
            Log.i("isServiceRunning","Not");
        }else {
            Log.i("isServiceRunning","Don");
        }
    }
    public void Test(View view){
        startService(new Intent(this, SensorService.class));
    }
    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())) {
                return true;
            }
        }
        return false;
    }
}
/// Service 
public class SensorService extends Service {
    public int counter=0;
    public SensorService() {
        super();
        Log.i("HERE", "here I am!");
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        super.onStartCommand(intent, flags, startId);
        startTimer();
        return START_STICKY;
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i("EXIT", "ondestroy!");
      //  Intent broadcastIntent = new Intent(this, SensorRestarterBroadcastReceiver.class);
        stoptimertask();
    }
    private Timer timer;
    private TimerTask timerTask;
    long oldTime=0;
    public void startTimer() {
        //set a new Timer
        Log.i("startTimer", "Don");
        timer = new Timer();
        //initialize the TimerTask's job
        initializeTimerTask();
        //schedule the timer, to wake up every 1 second
        timer.schedule(timerTask, 1000, 1000); //
    }
    /**
     * it sets the timer to print the counter every x seconds
     */
    public void initializeTimerTask() {
        Log.i("initializeTimerTask", "Don");
        timerTask = new TimerTask() {
            public void run() {
                Log.i("in_timer", "in timer ++++  "+ (counter++));
            }
        };
    }
     /**
     * not needed
     */
    public void stoptimertask() {
        //stop the timer, if it's not already null
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
    }
    @Nullable
    @Override
    public IBinder onBind(Intent intent){
        return null;
    }
}