Android UI主进程跟子进程直接相互通信

package com.example.threadcomm;

import android.R.integer;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
/** Called when the activity is first created. */
// 主线程给子线程发送消息
Button verifyButton;
TextView textView;

private static int FROM_MAIN_MSG1 = 1;
private static int FROM_SUB_MSG2 = 11;

// 主线程
MainActivityHandler mainHandler;
// 其它线程
SubThreadHandler subThreadHandler;

private int i = 0;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

verifyButton = (Button) findViewById(R.id.verify_button);
textView = (TextView) findViewById(R.id.text);

textView.setText("");

verifyButton.setOnClickListener(clickListener);

// 创建子线程
MyThread thread = new MyThread();
thread.start();
}

OnClickListener clickListener = new OnClickListener() {

@Override
public void onClick(View v) {
switch (v.getId()) {
// 主线程给子线程发送消息
case R.id.verify_button:
textView.append("UI main thread: shall send message to sub-thread......\n\n");
subThreadHandler.sendEmptyMessage(1);
break;

default:
break;
}
}
};

// 主线程处理消息

class MainActivityHandler extends Handler {

public MainActivityHandler(Looper looper) {
super(looper);
}

@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);

if (msg.what == 11) {
textView.append("UI main thread: received message from sub-thread......\n\n");
}
}
}

// 以下是子线程类和他的handler类
class MyThread extends Thread {
@Override
public void run() {
Log.e("threads_comm", "sub thread was created here......");

super.run();
// 创建该线程的Looper对象，用于接收消息
Looper.prepare();
// 线程的looper创建的handler表示消息接收者是子线程
subThreadHandler = new SubThreadHandler(Looper.myLooper());
// 循环从MessageQueue中取消息。
Looper.loop();
}
}

// 子线程的Handler

class SubThreadHandler extends Handler {
public SubThreadHandler(Looper looper) {
super(looper);
}

@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);

if (msg.what == FROM_MAIN_MSG1) {
mainHandler = new MainActivityHandler(Looper.getMainLooper());
textView.append("Sub-thread: received message from UI main thread, and will send message to UI main thread......\n\n");
mainHandler.sendEmptyMessage(11);

}
}
}
}

对应的activity_main.xml文件：

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