package com.example.threadcomm;
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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：
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" >
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world"
android:layout_above="@+id/button3"
android:layout_marginBottom="50dp"
/>
android:id="@+id/verify_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="send"
android:layout_centerInParent="true"
android:background="@drawable/shape"
/>
