handler实例

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public class MyHandlerActivity extends Activity {    Button button;    MyHandler myHandler;    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.handlertest);        button = (Button) findViewById(R.id.button);        myHandler = new MyHandler();        // 当创建一个新的Handler实例时, 它会绑定到当前线程和消息的队列中,开始分发数据        // Handler有两个作用, (1) : 定时执行Message和Runnalbe 对象        // (2): 让一个动作,在不同的线程中执行.        // 它安排消息,用以下方法        // post(Runnable)        // postAtTime(Runnable,long)        // postDelayed(Runnable,long)        // sendEmptyMessage(int)        // sendMessage(Message);        // sendMessageAtTime(Message,long)        // sendMessageDelayed(Message,long)              // 以上方法以 post开头的允许你处理Runnable对象        //sendMessage()允许你处理Message对象(Message里可以包含数据,)        MyThread m = new MyThread();        new Thread(m).start();    }    /**    * 接受消息,处理消息 ,此Handler会与当前主线程一块运行    * */    class MyHandler extends Handler {        public MyHandler() {        }        public MyHandler(Looper L) {            super(L);        }        // 子类必须重写此方法,接受数据        @Override        public void handleMessage(Message msg) {            // TODO Auto-generated method stub            Log.d("MyHandler", "handleMessage......");            super.handleMessage(msg);            // 此处可以更新UI            Bundle b = msg.getData();            String color = b.getString("color");            MyHandlerActivity.this.button.append(color);        }    }    class MyThread implements Runnable {        public void run() {            try {                Thread.sleep(10000);            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }            Log.d("thread.......", "mThread........");            Message msg = new Message();            Bundle b = new Bundle();// 存放数据            b.putString("color", "我的");            msg.setData(b);            MyHandlerActivity.this.myHandler.sendMessage(msg); // 向Handler发送消息,更新UI        }    }}
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