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());
