android程序显示时间,在Android应用程序中显示当前时间和日期

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public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    Thread myThread = null;    Runnable runnable = new CountDownRunner();    myThread= new Thread(runnable);       myThread.start();}public void doWork() {    runOnUiThread(new Runnable() {        public void run() {            try{                TextView txtCurrentTime= (TextView)findViewById(R.id.lbltime);                    Date dt = new Date();                    int hours = dt.getHours();                    int minutes = dt.getMinutes();                    int seconds = dt.getSeconds();                    String curTime = hours + ":" + minutes + ":" + seconds;                    txtCurrentTime.setText(curTime);            }catch (Exception e) {}        }    });}class CountDownRunner implements Runnable{    // @Override    public void run() {            while(!Thread.currentThread().isInterrupted()){                try {                doWork();                    Thread.sleep(1000);                } catch (InterruptedException e) {                        Thread.currentThread().interrupt();                }catch(Exception e){                }            }    }}