Android Bundle類筆記

來源:互聯網
上載者:User

Bundle類是一個key-value對,“A mapping from String values to various Parcelable types.”
兩個activity之間的通訊可以通過bundle類來實現,做法就是:
(1)建立一個bundle類
[java]  
Bundle mBundle = new Bundle();  
(2)bundle類中加入資料(key -value的形式,另一個activity裡面取資料的時候,就要用到key,找出對應的value)
[java] 
mBundle.putString("Data", "data from TestBundle"); 

(3)建立一個intent對象,並將該bundle加入這個intent對象
[cpp]
Intent intent = new Intent();   
intent.setClass(TestBundle.this, Target.class);   
intent.putExtras(mBundle); 
完整代碼如下:
android mainfest.xml如下:
[java] 
<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="www.2cto.com" 
      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>  

兩個類如下:intent從TestBundle類發起,到Target類。
類1:TestBundle類:
[java]  
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");//壓入資料   
                intent.putExtras(mBundle);   
                startActivity(intent); 
            } 
        }; 
        button1.setOnClickListener(cl); 
    } 
}   

類2: Target
[java]  
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> //得到傳過來的bundle 
        String data = bundle.getString("Data");//讀出資料   
        setTitle(data);   
 
    }   
}   

布局檔案:
main.xml
[java]
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android=www.2cto.com 
    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
[java] 
<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="www.2cto.com" 
    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
[java] 
<?xml version="1.0" encoding="utf-8"?> 
<resources> 
    <string name="hello">Hello World, TestBundle!</string> 
    <string name="app_name">測試Bundle用法</string> 
    <string name="button">點擊跳轉</string> 
    <string name="target">來到target activity</string> 
</resources> 

結果:

跳轉結果:
作者:by317966834

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