Android学习笔记——Bundle

该工程的功能是实现不同线程之间数据的传递

以下代码是MainActivity.java中的代码

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");
        }
    }
}

以下代码是activity_main.xml中的代码

<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>