Parsing EventElement for XMPP using Smack Library

Question

Can anyone please help to show me on how to parse this Event pub element and get the Message object for the following Packet. Maybe my keyword/search term googling is not correct but I'm not able to find anything helpful while looking for the documentation or tutorial about this.

I have read something about PacketParserUtils and XmlPullParser and tried to implement it, I keep on getting null.

Code

EventElement event = groupMessage.getExtension("event", "http://jabber.org/protocol/pubsub#event");

try {
    XmlPullParser parser = PacketParserUtils.newXmppParser();

    Log.d(TAG, "processStanza event: "+ event.toXML().toString());
    parser.setInput(new StringReader(event.toXML().toString()));
    Item  items = (Item) parser.getProperty("items");

    Log.d(TAG, "processStanza: " + items);
} catch (XmlPullParserException e) {
    e.printStackTrace();
}

<message to='[email protected]/Resource' from='[email protected]'>
    <event xmlns='http://jabber.org/protocol/pubsub#event'>
        <items node='urn:xmpp:mucsub:nodes:messages'>
            <item id='17100773132085304799'>
                <message xmlns='jabber:client' lang='en' to='[email protected]' from='[email protected]/[email protected]' type='groupchat' id='21D85845-8434-4E0B-BB0C-5768256C5B66'>
                    <body xmlns='jabber:client'>This is the message</body>
                </message>
            </item>
        </items>
    </event>
</message>

Nischal Nischal · Accepted Answer · 2019-05-07T08:35:24

Though its late, it may help new users. You can parse custom muc-sub xml as :

(In Kotlin)

xmppTcpConnection.addAsyncStanzaListener(StanzaListener {
it?.let { stanza ->
  if (stanza is Message) {

    val eventElement: EventElement? = stanza.getExtension(

              "event",
              "http://jabber.org/protocol/pubsub#event") 

    if (eventElement != null) {

        val itemsExtension: ItemsExtension = eventElement .event as ItemsExtension 

        itemsExtension.items?.forEach { namedElement ->
             val payloadItem = namedElement as PayloadItem<*>

             val simplePayload: SimplePayload = payloadItem.payload as SimplePayload

             val parserString: String = simplePayload.toXML(null)

             val xmlPullParser: XmlPullParser = PacketParserUtils.getParserFor(parserString)

             val message: Message = PacketParserUtils.parseMessage(xmlPullParser)

             //Your code here
         }
       }
   }
 }
}, StanzaTypeFilter(Message::class.java))

Refer Smack Discussion here

Parsing EventElement for XMPP using Smack Library

1 Answers