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  • android中的Handler

      我的实例:

    package com.wyl.wylhandler;
    
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.support.v7.app.ActionBarActivity;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.TextView;
    
    public class MainActivity extends ActionBarActivity {
    	TextView tv;
    	Button btn;
    	Message msg;
    	Handler handler;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            tv = (TextView)findViewById(R.id.textViewId); //获取TextView
            btn = (Button)findViewById(R.id.buttonId);	  //获取Button
            myOnclickListener l = new myOnclickListener();//实例化一个监听器l
            btn.setOnClickListener(l);					  //btn绑定上面获取的监听器l
            
        }
    
        class myOnclickListener implements OnClickListener{
        	@Override
        	public void onClick(View v) {
        		String c = "wyl";//设置断点用的
        		int len = c.length();//设置断点用的
        		System.out.println("len:"+len);
        		//1 .通过handler对象来获取message
        		myHandler myhandler = new myHandler();
        		msg = myhandler.obtainMessage();
        		String a = "zhang雅岚";//设置断点用的
        		msg.what = len;
        		msg.obj = a;
        		//handler sendMessage(msg)后,looper就自动从消息队列里取出msg(通过handleMessage方法),
        		myhandler.sendMessage(msg);	//handler把msg存入队列中
        		System.out.println("onClick所在线程:"+Thread.currentThread().getName());
        	}	//调试发现,loop是在这一行的时候获取handler存入队列中的值msg
        }
        
        class myHandler extends Handler{
        	@Override
        	public void handleMessage(Message message) {
        		String name = "weiyongle";		//设置断点用的
        		int len2 = name.length();		//设置断点用的
        		System.out.println("len2:"+len2+","+"myHandler:"+Thread.currentThread().getName());
        		Object obj = message.obj;		
        		System.out.println("myHandler里打印出来:"+obj+"myHandler所在线程:"+Thread.currentThread().getName());
        		
        	}
        }
        
    
    }
    

      

      

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  • 原文地址:https://www.cnblogs.com/Sunnor/p/4671120.html
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