如何从XMPP XML消息中获取自定义属性值？

发布时间：2020-12-16 07:46:13 所属栏目：百科来源：网络整理

导读：好的,简单的问题,但对我来说非常重要. 所以,其他Android客户端正在发送此xml消息： message id='6ymdM-19' to='xox@xox.xox/smack' type='chat' subjectnormal/subject received xmlns='urn:xmpp:receipts' id='HVgQw-5'//message 我的听众大致是这样的： pr

好的,简单的问题,但对我来说非常重要.

所以,其他Android客户端正在发送此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>

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,我想在“received”元素标记内获取属性“id”的值.
但我在我的日志上得到的是这样的：

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

那我怎么能得到’HVgQw-5’？

UPDATE

实际上有一些奇怪的东西……
我从我的SMACK调试中收到了xml accordinh,如下所示：

<
 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时,它就像这样打印出来：

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>

为什么会这样？为什么我会错过“id”？

关于ID,首先获取扩展句柄然后查找ID,这样

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

相关讨论：
asmack – receiving custom XML messages

>定义您的EmbeddedPacketExtension(因此您可以获得此处理而不是SMACK提供的DefaultPacketExtension)
>扩展EmbeddedExtensionProvider的提供程序
>您刚刚使用Namespace创建的registerProvider

代码如下：

/**
* 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());

（编辑：李大同）

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