Android 读取<meta-data>元素的数据
在AndroidManifest.xml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:
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ActivityInfo info= this .getPackageManager().getActivityInfo(getComponentName(),PackageManager.GET_META_DATA); |
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String msg=info.metaData.getString( "myMsg" ); |
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System.out.println( "myMsg:" +msg); |
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:
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ApplicationInfo appInfo = this .getPackageManager().getApplicationInfo(getPackageName(),PackageManager.GET_META_DATA); |
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String msg=appInfo.metaData.getString( "myMsg" ); |
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System.out.println( "myMsg:" +msg); |
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:
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ComponentName cn= new ComponentName( this , MetaDataService. class ); |
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ServiceInfo info= this .getPackageManager().getServiceInfo(cn, PackageManager.GET_META_DATA); |
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String msg=info.metaData.getString( "myMsg" ); |
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System.out.println( "myMsg:" +msg); |
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:
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ComponentName cn= new ComponentName(context, MetaDataReceiver. class ); |
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ActivityInfo info=context.getPackageManager().getReceiverInfo(cn, PackageManager.GET_META_DATA); |
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String msg=info.metaData.getString( "myMsg" ); |
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System.out.println( "myMsg:" +msg); |
以上例子在android2.1运行通过