Android之meta-data使用

<meta-data
    android:name="data_name"
    android:value="@string/meta_data"
    android:resource="@string/meta_data"/>

<activity
     android:name=".MainActivity"
     android:label="@string/app_name">
     <intent-filter>
         <action android:name="android.intent.action.MAIN"/>
         <category android:name="android.intent.category.LAUNCHER"/>
     </intent-filter>
    
    <meta-data
        android:name="data_name"
        android:value="@string/meta_data"
        />
</activity>

    // 使用时注意加上try_catch
    ActivityInfo actInfo = this.getPackageManager().getActivityInfo( 
            getComponentName(), PackageManager.GET_META_DATA); 
    String msg = actInfo.metaData.getString("data_name"); 
    // 如果meta-data类型是资源ID，使用getInt获取资源ID即可

<service android:name=".MyService">
    <meta-data
        android:name="data_name"
        android:value="@string/meta_data"/>
</service>

    ComponentName cn = new ComponentName(this, MyService.class); 
    ServiceInfo serInfo = this.getPackageManager().getServiceInfo(cn, 
            PackageManager.GET_META_DATA);
    String msg = serInfo.metaData.getString("data_name");

<receiver android:name=".MyReceiver">
    <meta-data
        android:name="data_name"
        android:value="@string/meta_data"/>
 
    <intent-filter>
        <action android:name="android.intent.action.PHONE_STATE"/>
    </intent-filter>
</receiver>

    ComponentName cn = new ComponentName(this, MyReceiver.class); 
    ActivityInfo info = this.getPackageManager().getReceiverInfo(cn, 
                PackageManager.GET_META_DATA); 
    String msg = info.metaData.getString("data_name"); 

<application>
    <meta-data
        android:name="data_name"
        android:value="@string/meta_data"/> 
</application>

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