方法一：Handler.postDelayed實現
1、執行迴圈的函式如下：

private Handler handler = new Handler();   
    private Runnable task = new Runnable() {  
        public void run() {   
            // TODO Auto-generated method stub
                handler.postDelayed(this,5*1000);//設定迴圈時間，此處是5秒
                //需要執行的程式碼
        }   
    };
 

2、呼叫的程式碼如下：

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        handler.postDelayed(task,5000);//延遲呼叫
        handler.post(task);//立即呼叫

    }

方法二：Timer 實現

1.TimerTask例項

    TimerTask timerTask = new TimerTask() {

        @Override
 

        public void run() {
            Message msg = new Message();
            msg.what = 1;
            handler.sendMessage(msg);
        }
    };

    Handler handler = new Handler(){
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case 1:
                //需要迴圈執行的程式碼
 

                break;
            default:
                break;
            }
        };
    };
    ```

2.呼叫方式

mTimer = new Timer();
        //5s響一次 
        mTimer.schedule(timerTask, 0, 5000);

3.onDestroy()處理

protected void onDestroy() {
        super.onDestroy();
        mTimer.cancel();
    };