Android学习笔记——Bundle

package com.example.bundle;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//打印了当前线程的ID
System.out.println("Activity-->"  + Thread.currentThread().getId());
//生成一个HandleThread对象，实现了使用Looper来处理消息队列的功能，这个类由android程序框架提供
HandlerThread handlerThread = new HandlerThread("handler_thread");
//在使用HandlerThread的getLooper（）方法之前，必须先调用该类的start（）
handlerThread.start();
MyHandler myHandler = new MyHandler(handlerThread.getLooper());
Message msg = myHandler.obtainMessage();
//msg.obj="abc";
//将msg发送到目标对象，所谓的目标对象，就是生成该msg对象的handler对象
Bundle b = new Bundle();
b.putInt("age", 20);
b.putString("name", "John");
msg.setData(b);
msg.sendToTarget();
}

class MyHandler extends Handler{
public MyHandler(){

}
public MyHandler(Looper looper){
//super调用父类
super(looper);
}
public void handleMessage(Message msg){
//String s = (String)msg.obj;
Bundle b = msg.getData();
int age = b.getInt("age");
String name = b.getString("name");
System.out.println("age is " + age +", name is " + name);
System.out.println("Handler-->" + Thread.currentThread().getId());
System.out.println("handlerMessage");
}
}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="${relativePackage}.${activityClass}" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

</LinearLayout>