语法如下:

<meta-data android:name="string"
android:resource="resource specification"
android:value="string" />

<meta-data>标签可以作为子标签,可以被包含在<activity>、<application> 、<service>和<receiver>中:

1. Activity标签中:

 <activity...>
<meta-data android:name="Data_Name" android:value="DataValue"></meta-data>
</activity>

在代码中动态获取:

ActivityInfo info=this.getPackageManager()
.getActivityInfo(getComponentName(),
PackageManager.GET_META_DATA);
String msg =info.metaData.getString("Data_Name");

2.application标签中:

<application...>
<meta-data android:value="DataValue" android:name="Data_Name"></meta-data>
</application>

在代码中动态获取:

 ApplicationInfo appInfo = this.getPackageManager()
.getApplicationInfo(getPackageName(),
PackageManager.GET_META_DATA);
String msg=appInfo.metaData.getString("Data_Name");

3.在service标签中:

<service android:name="MetaDataService">
<meta-data android:value="DataValue" android:name="Data_Name"></meta-data>
</service>

在代码中获取:

ComponentName cn=new ComponentName(this, MetaDataService.class);
ServiceInfo info=this.getPackageManager()
.getServiceInfo(cn, PackageManager.GET_META_DATA);
String msg=info.metaData.getString("Data_Name");

4. 在receive标签中:

 <receiver android:name="MetaDataReceiver">
<meta-data android:value="DataValuer" android:name="Data_Name"></meta-data>
<intent-filter>
<action android:name="android.intent.action.PHONE_STATE"></action>
</intent-filter>
</receiver>

在代码中获取:

ComponentName cn=new ComponentName(context, MetaDataReceiver.class);
ActivityInfo info=context.getPackageManager()
.getReceiverInfo(cn, PackageManager.GET_META_DATA);
String msg=info.metaData.getString("Data_Name");
05-07 15:50
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