Android中的使用

时间:2024-05-02 18:34:02

[转]  原文

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:
   <activity...>
       <meta-data android:name="myMsg" 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("myMsg");
    System.out.println("myMsg:"+msg);

2:在application的应用。
   xml代码段:
  <application...>
       <meta-data android:value="hello my application" android:name="myMsg"></meta-data>
   </application>
  
   java代码段:
    ApplicationInfo appInfo = this.getPackageManager()
                                 .getApplicationInfo(getPackageName(),
                         PackageManager.GET_META_DATA);
    String msg=appInfo.metaData.getString("myMsg");
    System.out.println("myMsg:"+msg);

3:在service的应用。
   xml代码段:
   <service android:name="MetaDataService">
      <meta-data android:value="hello my service" android:name="myMsg"></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("myMsg");
    System.out.println("myMsg:"+msg);

4: 在receiver的应用。
   xml代码段:
    <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代码段:
    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);