android Timer使用方法

Timer属性:http://www.apihome.cn/api/java/Timer.html

声明创建:

 1 private Timer mTimer;
 2 
 3 protected void onCreate(Bundle savedInstanceState) { 
 5         super.onCreate(savedInstanceState);
 6         this.setContentView(R.layout.main); 7 
 8         timer = new Timer();
 9         timer.schedule(task, 1000, 5000);
11     }
13 
14 TimerTask task = new TimerTask() {
15         @Override    
16         public void run() {
18             Message message = new Message();
20             message.what = 1;
22             handler.sendMessage(message);
24         }
26     };
27 
28     final Handler handler = new Handler() {
30         public void handleMessage(Message msg) {
32             switch (msg.what) {
34             case 1:
36                 log.e("Timer", "Timer");
38                 //要实现的功能代码:update();
40                 break;
42             }
44             super.handleMessage(msg);
46         }
48     };
49 
50     protected void onDestroy() {
52         if (timer != null) {
54             timer.cancel();
56             timer = null;
58         }
60         super.onDestroy();
62     }

最重要的一点是 timer.schedule(task,1000,5000),如果设置为 timer.schedule(task,5000)是不会工作的。
因为timer.schedule(task,5000) 是表示执行一次的任务。
timer.schedule(task,1000,5000)表示 1 秒钟后开始 5 秒钟为周期 重复执行

 1     private Handler handler = new Handler( );
 2 
 3     private Runnable runnable = new Runnable( ) {
 4 
 5     public void run ( ) {
 6 
 7        update( );
 8 
 9        handler.postDelayed(this,1000);     //postDelayed(this,1000)方法安排一个Runnable对象到主线程队列中
10 
11       }
12 
13     };
14 
15     handler.postDelayed(runnable,1000);         // 开始Timer
16 
17     handler.removeCallbacks(runnable);           //停止Timer

(转自:http://blog.csdn.net/jincf2011/article/details/6603916)

posted @ 2015-03-12 09:50  jenson138  阅读(7121)  评论(0编辑  收藏  举报