众所周知, 每个组件都有<meta-data>元素, 用于接收一些外部数据(eg: appKey), 那其中的值应该怎么读取呢.
引用
1> Application
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<meta-data
android:name="application_meta_data"
android:value="application_meta_data_value" /> <!--可以关联资源ID, 支持多种数据类型 -->
ApplicationInfo info = null;
try {
info = getPackageManager()
.getApplicationInfo(getPackageName(), PackageManager.GET_META_DATA);
} catch (NameNotFoundException e) {
e.printStackTrace();
}
Log.v(TAG, "application meta data value:" + info.metaData.getString("application_meta_data"));
引用
2> Activity
<activity
android:name="fyc.app.testandroid.MainActivity" >
<meta-data
android:name="activity_meta_data"
android:value="activity_meta_data_value" />
</activity>
ActivityInfo info = null;
try {
info = getPackageManager()
.getActivityInfo(getComponentName(), PackageManager.GET_META_DATA);
} catch (NameNotFoundException e) {
e.printStackTrace();
}
Log.v(TAG, "activity meta data value:" + info.metaData.getString("activity_meta_data"));
引用
3> Service
<service android:name="fyc.app.testandroid.MyService" >
<meta-data
android:name="service_meta_data"
android:value="service_meta_data_value" />
</service>
ServiceInfo info = null;
try {
info = getPackageManager()
.getServiceInfo(new ComponentName(this, MyService.class), PackageManager.GET_META_DATA); //如果在当前组件获取直接使用getcomponentName()
} catch (NameNotFoundException e) {
e.printStackTrace();
}
Log.v(TAG, "service meta data value:" + info.metaData.getString("service_meta_data"));
引用
4> BroadcastReceiver
<receiver android:name="fyc.app.testandroid.MyReceiver" >
<meta-data
android:name="receiver_meta_data"
android:value="receiver_meta_data_value" />
</receiver>
ActivityInfo info = null;
try {
info = getPackageManager()
.getReceiverInfo(new ComponentName(this, MyReceiver.class), PackageManager.GET_META_DATA);
} catch (NameNotFoundException e) {
e.printStackTrace();
}
Log.v(TAG, "receiver meta data value:" + info.metaData.getString("receiver_meta_data"));
Logcat输出信息
11:11:46.733: V/MainActivity(571): application meta data value:application_meta_data_value
11:11:46.733: V/MainActivity(571): activity meta data value:activity_meta_data_value
11:11:46.763: V/MainActivity(571): service meta data value:service_meta_data_value
11:11:46.783: V/MainActivity(571): receiver meta data value:receiver_meta_data_value
官方介绍
http://developer.android.com/guide/topics/manifest/meta-data-element.html