定时器

    private Timer timer;    private TimerTask task=new TimerTask(){        @Override        public void run() {            SimpleDateFormat format=new SimpleDateFormat("HH:mm:ss");            Date date=new Date();            String currentTime = format.format(date);            Log.e("mrpeng","当前时间是"+currentTime);        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        timer = new Timer();        timer.schedule(task,0,1000);    }