Android Bundle类

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

  1. 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)

  1. 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

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

完整代码如下:

    <?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);    
            <span style="color:#ff6600;">Bundle bundle = getIntent().getExtras();   </span> //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 Bundle类

跳转结果:

Android Bundle类

转:http://www.cnblogs.com/xiaoruhan/archive/2012/03/02/2377117.html

Android Bundle类,布布扣,bubuko.com

Android Bundle类

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