android 开发中:
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,
不同的父元素,在应用时读取的方法也不同。
1 :在Activity应用<meta-data>元素。
xml代码段:
<activity...><meta-data android:name="data_Name" 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("data_Name");Log.d(TAG, " msg == " + msg );
2:在application应用<meta-data>元素。
xml代码段:
<applicationandroid:name=".main.MyApplication"android:icon="@drawable/ic_launcher"android:label="@string/app_name" ><meta-dataandroid:name="RONG_CLOUD_APP_KEY"android:value="sdasdsadassadasdsdas" /></application>
java代码段:
ApplicationInfo appInfo;try {appInfo = MyApplication.this.getPackageManager().getApplicationInfo(MyApplication.this.getPackageName(), PackageManager.GET_META_DATA);String msg = appInfo.metaData.getString("RONG_CLOUD_APP_KEY");} catch (NameNotFoundException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}
3:在service应用<meta-data>元素。
xml代码段:
<service android:name="MetaDataService"><meta-data android:value="hello my service" android:name="data_Name"></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("data_Name");Log.d(TAG, " msg == " + msg );
4: 在receiver应用<meta-data>元素。
xml代码段:
<receiver android:name="MetaDataReceiver"><meta-data android:value="hello my receiver" android:name="data_Name"></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("data_Name");Log.d(TAG, " msg == " + msg );