Handler

handler可以分发Message对象和Runnable对象到主线程中, 每个Handler实例,都会绑定到创建他的线程中(一般是位于主线程),
        它有两个作用: (1):  安排消息或Runnable 在某个主线程中某个地方执行, (2)安排一个动作在不同的线程中执行
        Handler中分发消息的一些方法
        post(Runnable)
        postAtTime(Runnable,long)
        postDelayed(Runnable long)
        sendEmptyMessage(int)
        sendMessage(Message)
        sendMessageAtTime(Message,long)
        sendMessageDelayed(Message,long)
        以上post类方法允许你排列一个Runnable对象到主线程队列中,
        sendMessage类方法, 允许你安排一个带数据的Message对象到队列中，等待更新.

示例1、postDelayed(Runnable long)；

     private Handler myHandler = new Handler();
	Runnable myrun = new Runnable() {
		@Override
		public void run() {
			// TODO Auto-generated method stub
			myHandler.postDelayed(myrun, 1000);
		}
	};
myHandler.post(myrun);  //start
myHandler.removeCallbacks(myrun);  //stop

示例2、sendMessage(Message)

Handler handler = new Handler(){
		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			switch(msg.what){
			case 1:
                      //do your action;
			}
		}
	};
Runnable runnable = new Runnable() {
		
		@Override
		public void run() {
			// TODO Auto-generated method stub
			msg.what = 1;
			//do your action;
			handler.sendMessage(msg);
		}
	};

代码下载链接：http://www.apkbus.com/android-179364-1-1.html