Handler主线程子线程之间的互相通信

Handler主线程子线程之间的互相通信

 package com.wyl.dansnote; import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.Toast; public class SecActivity extends Activity implements OnClickListener{
     Button btn_main_to_work;
     Button btn_work_to_main;
     Handler handler;
     Handler handler_main_to_work;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.sec_main);
         initViews();
         initMainHandler();//子线程向主线程发送消息
         new MainToWorkThread().start();//主线程向子线程发送消息
         initClicks();
     }     private void initMainHandler() {
         handler = new MainHandler();
     }
     class MainHandler extends Handler{
         @Override
         public void handleMessage(Message msg) {
             String msg_rtn = (String)msg.obj;
 //            System.out.print("MainHandler.handleMessage():"+msg_rtn+",当前线程："+Thread.currentThread().getName());
             Toast.makeText(SecActivity.this, "MainHandler.handleMessage():"+msg_rtn+",当前线程："+Thread.currentThread().getName(), 100).show();
         }
     }
     //子线程向主线程发送消息
     class WorktoMainThread extends Thread{
         @Override
         public void run() {
             Message msg = handler.obtainMessage();
             msg.obj = "我是模拟的网络数据";
             handler.sendMessage(msg);
             System.out.println("开始发送网络数据：");
             //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
 //            Looper.prepare();
 //            Toast.makeText(SecActivity.this, Thread.currentThread().getName()+"开始发送网络数据:", 100).show();
         }
     }     class MainToWorkThread extends Thread{
         @Override
         public void run() {
             Looper.prepare();
             handler_main_to_work = new Handler(){
                 @Override
                 public void handleMessage(Message msg) {
                     String msg_get = (String)msg.obj;
 //                    handler_main_to_work.sendMessage(msg);
                     Toast.makeText(SecActivity.this, Thread.currentThread().getName()+",MaintoWorkHandler.handleMessage()开始接收消息:"+msg_get, 100).show();
                 }
             };
             Message msg = handler_main_to_work.obtainMessage();
             String msg_get = (String) msg.obj;
             System.out.println("MainToWorkThread获取到的消息："+msg_get);
             Looper.loop();
         }
     }     private void initClicks() {
         btn_main_to_work.setOnClickListener(this);
         btn_work_to_main.setOnClickListener(this);
     }     private void initViews() {
         btn_main_to_work = (Button) findViewById(R.id.id_btn_w_to_main);
         btn_work_to_main = (Button) findViewById(R.id.id_btn_main_to_w);
     }     @Override
     public void onClick(View v) {
         switch (v.getId()) {
         case R.id.id_btn_w_to_main:
             new WorktoMainThread().start();
             break;
         case R.id.id_btn_main_to_w:
             Message msg = handler_main_to_work.obtainMessage();
             msg.obj = "我是点击的时候发送给子线程的消息";
             handler_main_to_work.sendMessage(msg);
             break;
         default:
             break;
         }
     }
 }