android meta-data 读取

 

在AndroidManifest.xml文件中,<meta-data>元素可以作为子元素,被包含在<activity>、<application> 、<service>和<receiver>元素中,但不同的父元素,在应用时读取的方法也不同。

 

1 .在Activity的应用
    xml代码段:
   <activity...>
       <meta-data android:name="myMsg" android:value="hello my activity"></meta-data>
    </activity>
    
    java代码段:
    ActivityInfo info=this.getPackageManager().getActivityInfo(getComponentName(),
                          PackageManager.GET_META_DATA);
    String msg=info.metaData.getString("myMsg");

   

2.在application的应用
   xml代码段:
  <application...>
       <meta-data android:value="hello my application" android:name="myMsg"></meta-data>
   </application>
   
   java代码段:
    ApplicationInfo appInfo = this.getPackageManager().getApplicationInfo(getPackageName(), 
                          PackageManager.GET_META_DATA);
    String msg=appInfo.metaData.getString("myMsg");

 

3.在service的应用
   xml代码段:
   <service android:name="MetaDataService">
      <meta-data android:value="hello my service" android:name="myMsg"></meta-data>
   </service>

 

   java代码段:
   ComponentName cn=new ComponentName(this, MetaDataService.class);
   ServiceInfo info=this.getPackageManager()
                        .getServiceInfo(cn, PackageManager.GET_META_DATA);
    String msg=info.metaData.getString("myMsg");

 

4.在receiver的应用
   xml代码段:
    <receiver android:name="MetaDataReceiver">
            <meta-data android:value="hello my receiver" android:name="myMsg"></meta-data>
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE"></action>
            </intent-filter>
    </receiver>


   java代码段:
    ComponentName cn=new ComponentName(context, MetaDataReceiver.class);
    ActivityInfo info=context.getPackageManager()
                             .getReceiverInfo(cn, PackageManager.GET_META_DATA);
    String msg=info.metaData.getString("myMsg");
  

 


本文转自:http://blog.csdn.net/dianyueneo/article/details/7427722

 

 

 

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