Android开发笔记(2) Android Bundle类实现Activity之间通信

PS:改变文章标题只为更加详细说明功能和排版,以方便日后复习,这篇文章已经写得很详细了  

转载地址 http://blog.csdn.net/randyjiawenjie/article/details/6651437


今天发现自己连Bundle类都没有搞清楚,于是花时间研究了一下。

根据google官方的文档(http://developer.android.com/reference/android/os/Bundle.html)

Bundle类是一个key-value对,“A mapping from String values to various Parcelable types.

类继承关系:

java.lang.Object
     android.os.Bundle

Bundle类是一个final类:
public final class
Bundle
extends Objectimplements Parcelable Cloneable

两个activity之间的通讯可以通过bundle类来实现,做法就是:

(1)新建一个bundle类

Bundle mBundle = new Bundle();

(2)bundle类中加入数据(key -value的形式,另一个activity里面取数据的时候,就要用到key,找出对应的value)

mBundle.putString("Data", "data from TestBundle");

(3)新建一个intent对象,并将该bundle加入这个intent对象

Intent intent = new Intent();    
intent.setClass(TestBundle.this, Target.class);    
intent.putExtras(mBundle);  

android mainfest.xml如下:

<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
      package="com.tencent.test"  
      android:versionCode="1"  
      android:versionName="1.0">  
    <application android:icon="@drawable/icon" android:label="@string/app_name">  
        <activity android:name=".TestBundle"  
                  android:label="@string/app_name">  
            <intent-filter>  
                <action android:name="android.intent.action.MAIN" />  
                <category android:name="android.intent.category.LAUNCHER" />  
            </intent-filter>  
        </activity>  
    <activity android:name=".Target"></activity>  
    </application>  
    <uses-sdk android:minSdkVersion="7" />  
</manifest>   

两个类如下:intent从TestBundle类发起,到Target类。

类1:TestBundle类:

import android.app.Activity;    
import android.content.Intent;    
import android.os.Bundle;    
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
  
public class TestBundle extends Activity {    
      
    private Button button1;  
    private OnClickListener cl;   
    public void onCreate(Bundle savedInstanceState) {    
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.main);  
          
        button1 = (Button) findViewById(R.id.button1);  
        cl = new OnClickListener(){  
            @Override  
            public void onClick(View arg0) {  
                // TODO Auto-generated method stub  
                Intent intent = new Intent();    
                intent.setClass(TestBundle.this, Target.class);    
                Bundle mBundle = new Bundle();    
                mBundle.putString("Data", "data from TestBundle");//压入数据    
                intent.putExtras(mBundle);    
                startActivity(intent);  
            }  
        };  
        button1.setOnClickListener(cl);  
    }  
}    


类2: Target

import android.app.Activity;    
import android.os.Bundle;    
  
public class Target extends Activity{    
  
    public void onCreate(Bundle savedInstanceState) {    
          
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.target);    
        Bundle bundle = getIntent().getExtras();//得到传过来的bundle  
        String data = bundle.getString("Data");//读出数据    
        setTitle(data);    
  
    }    
}    

布局文件:

main.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    >  
<TextView    
    android:layout_width="fill_parent"   
    android:layout_height="wrap_content"   
    android:text="@string/hello"  
    />  
<Button    
    android:layout_width="fill_parent"   
    android:layout_height="wrap_content"   
    android:text="@string/button"  
    android:id = "@+id/button1"  
    />   
</LinearLayout>  

target.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    >  
<TextView    
    android:layout_width="fill_parent"   
    android:layout_height="wrap_content"   
    android:text="@string/target"  
    />  
</LinearLayout>


String.xml

<?xml version="1.0" encoding="utf-8"?>  
<resources>  
    <string name="hello">Hello World, TestBundle!</string>  
    <string name="app_name">测试Bundle用法</string>  
    <string name="button">点击跳转</string>  
    <string name="target">来到target activity</string>  
</resources>

结果:

Android开发笔记(2) Android Bundle类实现Activity之间通信_第1张图片

跳转结果:

Android开发笔记(2) Android Bundle类实现Activity之间通信_第2张图片


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