问为什么我的服务在Android上不能工作？(我只想每隔5秒记录一次内容)

EN

public class HelloService extends Service {
    private Timer timer = new Timer();
    private long INTERVAL = 5000;

    public void onCreate() {
        super.onCreate();
        startservice();

    }

    private void startservice() {
        timer.scheduleAtFixedRate( new TimerTask() {
            public void run() {
                Log.d("servy", "This proves that my service works.");
            }
        }, 0, INTERVAL);
    ; }

    private void stopservice() {
        if (timer != null){
            timer.cancel();
        }
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }
}

    Intent helloservice = new Intent(this, HelloService.class);
    startService(helloservice);

<service android:name=".HelloService"/>

   <service android:name="HelloService"></service>