如何从XMPP XML消息获取自定义属性值？

Question

好吧，大家，简单的问题，但对我来说很重要。

如此，其他Android客户端在发送这个XML消息：

<message 
    id='6ymdM-19' 
    to='xox@xox.xox/smack' 
    type='chat'> 
    <subject>normal</subject> 
    <received xmlns='urn:xmpp:receipts' id='HVgQw-5'/> 
</message> 

和我的听众大致是这样的：

private class MsgListener implements ChatStateListener { 
/** 
* Constructor. 
*/ 
public MsgListener() { 
} 

@Override 
public void processMessage(Chat chat, org.jivesoftware.smack.packet.Message message) { 
    String xmlMessage = message.toXML(); 
    Log.v(TAG, "XML Chat: "+xmlMessage); 
    // getExtension namespace try urn:xmpp:receipts 
    if(xmlMessage.contains("<request xmlns=")) { 
     Log.d(TAG, "new chat message arrive! reply with RECEIVED!"); 
     replyReceived(message); 
    } else if(xmlMessage.contains("<received xmlns=")) { 
     Log.d(TAG, "RECEIVED notification arrived!"); 
     PacketExtension statusExtension = 
       message.getExtension("urn:xmpp:receipts"); 
     Log.d(TAG, "Extension name: "+statusExtension.getElementName()); 
     Log.d(TAG, "Extension XML: "+statusExtension.toXML()); 
     Log.d(TAG, "Extension string: "+statusExtension.toString()); 
    } 

    .... 
    .... 
    .... 
} 

在这种情况下，我想获得属性的值“标识“，在”收到“元素标签内。 但我对我的日志得到的是这样的：

RECEIVED notification arrived! 
D/ChatAdapter(320): Extension name: received 
D/ChatAdapter(320): Extension XML: <received xmlns="urn:xmpp:receipts"></received> 
D/ChatAdapter(320): Extension string:    
org.jivesoftware.smack.packet.DefaultPacketExtension@44f10430 

所以，我怎么能得到“HVgQw-5”？

UPDATE

实际上，有一些奇怪...... 我从SMACK调试接收XML accordinh这样的：

< 
D/SMACK(320): 05:40:28 PM RCV (1156991856): message id="6ymdM-19" 
to="syeikh@emass.sangkuriang.co.id/Smack" from="emu22@emass.sangkuriang.co.id/Smack" 
type="chat"><subject> 
D/SMACK(320): 05:40:28 PM RCV (1156991856): normal</subject><thread>cr0900</thread> 
**<received xmlns="urn:xmpp:receipts" id="HVgQw-5"/>**<active  
xmlns="http://jabber.org/protoc 
D/SMACK(320): 05:40:28 PM RCV (1156991856): ol/chatstates"/></message> 

但是，当我执行message.toXML它只是打印出来像这样：

XML Chat: <message id="6ymdM-19" to="syeikh@emass.sangkuriang.co.id/Smack" from="emu22@emass.sangkuriang.co.id/Smack" type="chat"><subject>normal</subject><thread>cr0900</thread>**<received xmlns="urn:xmpp:receipts">**</received><active xmlns="http://jabber.org/protocol/chatstates" /></message> 

为什么会发生这种情况？为什么我会错过“id”？

Answer 1

关于ID，第一个得到扩展的句柄然后找ID，所以

DeliveryReceipt deliveryReceiptObj =(DeliveryReceipt) message.getExtension(DeliveryReceipt.NAMESPACE); 
    // ID below is what you want 
    deliveryReceiptObj.getId(); 

相关讨论

asmack - receiving custom XML messages

1）定义EmbeddedPacketExtension（这样你就得到一个处理这而不是由SMACK提供的DefaultPacketExtension）

2）扩展EmbeddedExtensionProvider

3）registerProvider你只是命名空间

代码中创建如下：

     /** 
        * User: suvrat 
        * Represents a <b>message delivery receipt</b> entry as specified by 
        * <a href="http://xmpp.org/extensions/xep-0184.html">Message Delivery Receipts</a>. 
        * 
        */ 
        import org.jivesoftware.smack.packet.PacketExtension; 

        public class DeliveryReceipt implements PacketExtension 
       { 
         public static final String NAMESPACE = "urn:xmpp:receipts"; 

        private String id; /// original ID of the delivered message 

        public DeliveryReceipt(String id) 
        { 
         this.id = id; 
        } 

        public String getId() 
        { 
         return id; 
        } 

        public String getElementName() 
        { 
         return "received"; 
        } 

        public String getNamespace() 
        { 
         return NAMESPACE; 
        } 

        public String toXML() 
        { 
         return "<received xmlns='" + NAMESPACE + "' id='" + id + "'/>"; 
        } 
       } 

       /** 
       * User: suvrat 
       * The DeliveryReceiptProvider parses DeliveryReceipt packets. 
       */ 

       */ 
       import org.jivesoftware.smack.packet.PacketExtension; 
       import org.jivesoftware.smackx.provider.EmbeddedExtensionProvider; 
       import org.xmlpull.v1.XmlPullParser; 

       import java.util.List; 
       import java.util.Map; 

       public class DeliveryReceiptProvider extends EmbeddedExtensionProvider 
       { 

        @Override 
        protected PacketExtension createReturnExtension(String currentElement, String currentNamespace, 
          Map<String, String> attributeMap, List<? extends PacketExtension> content) 
        { 
         return new DeliveryReceipt(attributeMap.get("id")); 
        } 

       } 

         //3.) finally where ever you would like to parse packet 
        ProviderManager.getInstance().addExtensionProvider("received", DeliveryReceipt.NAMESPACE, new DeliveryReceiptProvider());