Handler

handler能够分发Message对象和Runnable对象到主线程中, 每一个Handler实例,都会绑定到建立他的线程中(通常是位于主线程),
        它有两个做用: (1):  安排消息或Runnable 在某个主线程中某个地方执行, (2)安排一个动做在不一样的线程中执行
        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类方法容许你排列一个Runnable对象到主线程队列中,
        sendMessage类方法, 容许你安排一个带数据的Message对象到队列中，等待更新.

示例一、postDelayed(Runnable long)；

Code     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

示例二、sendMessage(Message)

CodeHandler 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);
		}
	};

代码下载连接：http://www.apkbus.com/android-179364-1-1.html