Android 用meta-data配置参数

http://blog.csdn.net/r8HZGEmq/article/details/8228423

一，在activity中

xml中配置如下

 <!-- Activity -->
         <activity android:name=".MyActivity" 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="activity_name" android:value="activity_value" />
         </activity>

java代码如下

 ActivityInfo actInfo = mContext.getPackageManager().getActivityInfo(
                     getComponentName(), PackageManager.GET_META_DATA);
             String msg = actInfo.metaData.getString("activity_name");

二，在service中

xml中配置如下

 <!-- 服务 -->
         <service android:name=".MyService">
             <meta-data android:name="service_name" android:value="service_value" />
         </service>

java代码如下

 ComponentName cn = new ComponentName(this, MyService.class);
         try {
             ServiceInfo serInfo = this.getPackageManager().getServiceInfo(cn,
                     PackageManager.GET_META_DATA);
         } catch (NameNotFoundException e) {
             e.printStackTrace();
         }
         String msg = serInfo.metaData.getString("service_name");

三，在application中

xml中配置如下

 <!-- app -->
         <meta-data android:name="application_name" android:value="application_value" />

java代码如下

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

四，在receiver中，也就是广播接收者（拨打电话的时候会看到toast消息）
xml中配置如下

 <receiver android:name=".MyReceiver">
             <meta-data android:name="receiver_name" android:value="receiver_value" />
             <intent-filter>
                 <action android:name="android.intent.action.PHONE_STATE" />
             </intent-filter>
         </receiver>

java代码如下

 if (TextUtils.equals("android.intent.action.PHONE_STATE", intent
                 .getAction())) {
             ComponentName cn = new ComponentName(context, MyReceiver.class);
             try {
                 ActivityInfo info = context.getPackageManager().getReceiverInfo(cn,
                         PackageManager.GET_META_DATA);
             } catch (NameNotFoundException e) {
                 e.printStackTrace();
             }
             String msg = info.metaData.getString("receiver_name");
             // 打电话测试即可
             Toast.makeText(context, msg, Toast.LENGTH_SHORT).show();
         }