Android Timer 更好方法

原文：http://blog.csdn.net/vrix/article/details/6337589

Android 的Timer 一般如下面所写

Timer timer = new Timer();
TimerTask task = new TimerTask() {
    public void run() {
        Message message = new Message();
        message.what = 1;
        handler.sendMessage(message);  

    }  

};  

final Handler handler = new Handler() {  

    public void handleMessage(Message msg) {
        switch (msg.what) {
        case 1:
            Log.e("Timer", "Timer");
            update();
            break;
        }
        super.handleMessage(msg);
    }  

};  

protected void onDestroy() {
    if (timer != null) {
        timer.cancel();
        timer = null;
    }
    super.onDestroy();
}  

最重要一点是timer.schedule(task, 1000, 5000);如果设置为timer.schedule(task, 5000)是不会工作的。

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.setContentView(R.layout.main);
                               timer.schedule(task, 1000, 5000);
                }  

但更好的方法是通过下面的代码

private Handler handler = new Handler();  

private Runnable runnable = new Runnable() {  

    public void run() {
        update();
        handler.postDelayed(this, 1000);
    }  

};
 

开始Timer

handler.postDelayed(runnable, 1000);

停止Timer

handler.removeCallbacks(runnable);