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:
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2
3
|
<activity...>
<meta-data android:name=
"myMsg"
android:value=
"hello my activity"
></meta-data>
</activity>
|
java代码段:
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3
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ActivityInfo info =
this
.getPackageManager().getActivityInfo(getComponentName(), PackageManager.GET_META_DATA);
String msg = info.metaData.getString(
"myMsg"
);
System.out.println(
"myMsg:"
+ msg);
|
2:在application的应用。
xml代码段:
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2
3
|
<application...>
<meta-data android:value=
"hello my application"
android:name=
"myMsg"
></meta-data>
</application>
|
java代码段:
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2
3
|
ApplicationInfo appInfo =
this
.getPackageManager().getApplicationInfo(getPackageName(), PackageManager.GET_META_DATA);
String msg = appInfo.metaData.getString(
"myMsg"
);
System.out.println(
"myMsg:"
+ msg);
|
3:在service的应用。
xml代码段:
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3
|
<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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4
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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的应用。
xml代码段:
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6
|
<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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4
|
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);
|
参考资料:http://blog.sina.com.cn/s/blog_8417aea8010110he.html
本文转自 glblong 51CTO博客,原文链接:http://blog.51cto.com/glblong/1539248,如需转载请自行联系原作者