在AndroidManifest.xml中,<meta-data>元素可以作爲子元素,被包含在<activity>、<application> 、<service>和<receiver>元素中,但
不同的父元素,在應用時讀取的方法也不同。
1 :在Activity的應用。
xml代碼段:
<activity...>
<meta-data
android:name="myMsg" android:value="hello my activity"></meta-data>
</activity>
java代碼段:
ActivityInfo
info=this.getPackageManager()
.getActivityInfo(getComponentName(),
PackageManager.GET_META_DATA);
String
msg=info.metaData.getString("myMsg");
System.out.println("myMsg:"+msg);
2:在application的應用。
xml代碼段:
<application...>
<meta-data
android:value="hello my application" android:name="myMsg"></meta-data>
</application>
java代碼段:
ApplicationInfo appInfo
= this.getPackageManager()
.getApplicationInfo(getPackageName(),
PackageManager.GET_META_DATA);
String
msg=appInfo.metaData.getString("myMsg");
System.out.println("myMsg:"+msg);
3:在service的應用。
xml代碼段:
<service
android:name="MetaDataService">
<meta-data
android:value="hello my service" android:name="myMsg"></meta-data>
</service>
java代碼段:
ComponentName cn=new
ComponentName(this, MetaDataService.class);
ServiceInfo info=this.getPackageManager()
.getServiceInfo(cn,
PackageManager.GET_META_DATA);
String
msg=info.metaData.getString("myMsg");
System.out.println("myMsg:"+msg);
4: 在receiver的應用。
xml代碼段:
<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代碼段:
ComponentName cn=new
ComponentName(context, MetaDataReceiver.class);
ActivityInfo
info=context.getPackageManager()
.getReceiverInfo(cn,
PackageManager.GET_META_DATA);
String
msg=info.metaData.getString("myMsg");
System.out.println("myMsg:"+msg);