如何从XMPP XML消息中获取自定义属性值？

关于ID，首先获取扩展名的句柄，然后查找ID，因此

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

1. 定义您的

   EmbeddedPacketExtension

   （这样您就可以对此进行处理，而不是

   DefaultPacketExtension

   由SMACK提供）

2. 扩展的提供者

   EmbeddedExtensionProvider

3. registerProvider

   您刚刚使用命名空间创建的

代码如下：

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 + "'/>";    }}  */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());