Handler主线程子线程之间的互相通信

 1 package com.wyl.dansnote;
 2 
 3 
 4 import android.app.Activity;
 5 import android.os.Bundle;
 6 import android.os.Handler;
 7 import android.os.Looper;
 8 import android.os.Message;
 9 import android.view.View;
10 import android.view.View.OnClickListener;
11 import android.widget.Button;
12 import android.widget.Toast;
13 
14 public class SecActivity extends Activity implements OnClickListener{
15     Button btn_main_to_work;
16     Button btn_work_to_main;
17     Handler handler;
18     Handler handler_main_to_work;
19     @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.sec_main);
23         initViews();
24         initMainHandler();//子线程向主线程发送消息
25         new MainToWorkThread().start();//主线程向子线程发送消息
26         initClicks();
27     }
28     
29 
30     private void initMainHandler() {
31         handler = new MainHandler();
32     }
33     class MainHandler extends Handler{
34         @Override
35         public void handleMessage(Message msg) {
36             String msg_rtn = (String)msg.obj;
37 //            System.out.print("MainHandler.handleMessage():"+msg_rtn+",当前线程："+Thread.currentThread().getName());
38             Toast.makeText(SecActivity.this, "MainHandler.handleMessage():"+msg_rtn+",当前线程："+Thread.currentThread().getName(), 100).show();
39         }
40     }
41     //子线程向主线程发送消息
42     class WorktoMainThread extends Thread{
43         @Override
44         public void run() {
45             Message msg = handler.obtainMessage();
46             msg.obj = "我是模拟的网络数据";
47             handler.sendMessage(msg);
48             System.out.println("开始发送网络数据：");
49             //暂时还不清楚为什么这个线程里使用Toast的时候一定要加上Looper.prepare()，否则就报错
50 //            Looper.prepare();
51 //            Toast.makeText(SecActivity.this, Thread.currentThread().getName()+"开始发送网络数据:", 100).show();
52         }
53     }
54     
55     class MainToWorkThread extends Thread{
56         @Override
57         public void run() {
58             Looper.prepare();
59             handler_main_to_work = new Handler(){
60                 @Override
61                 public void handleMessage(Message msg) {
62                     String msg_get = (String)msg.obj;
63 //                    handler_main_to_work.sendMessage(msg);
64                     Toast.makeText(SecActivity.this, Thread.currentThread().getName()+",MaintoWorkHandler.handleMessage()开始接收消息:"+msg_get, 100).show();
65                 }
66             };
67             Message msg = handler_main_to_work.obtainMessage();
68             String msg_get = (String) msg.obj;
69             System.out.println("MainToWorkThread获取到的消息："+msg_get);
70             Looper.loop();
71         }
72     }
73 
74     private void initClicks() {
75         btn_main_to_work.setOnClickListener(this);
76         btn_work_to_main.setOnClickListener(this);
77     }
78 
79     private void initViews() {
80         btn_main_to_work = (Button) findViewById(R.id.id_btn_w_to_main);
81         btn_work_to_main = (Button) findViewById(R.id.id_btn_main_to_w);
82     }
83 
84     @Override
85     public void onClick(View v) {
86         switch (v.getId()) {
87         case R.id.id_btn_w_to_main:
88             new WorktoMainThread().start();
89             break;
90         case R.id.id_btn_main_to_w:
91             Message msg = handler_main_to_work.obtainMessage();
92             msg.obj = "我是点击的时候发送给子线程的消息";
93             handler_main_to_work.sendMessage(msg);
94             break;
95         default:
96             break;
97         }
98     }
99 }