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How to add a custom attribute (nickname) to your XMPP message tag in Smack 4.1

I want to add a custom attribute (nickname) to my XMPP chat message, for example the following example

<message from='*' to='*' id='123' nick='KASHIF' type='chat'><body>hello</body></message>

I know XMPP is not recommended , but this is my requirement, since this attribute (nick) is already implemented in the iOS version of the application in which I work on.

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To do this, you need to edit the 2 classes of Smack 4.1

  • Stanza class ( org.jivesoftware.smack.packet )
  • PacketParserUtils class in ( org.jivesoftware.smack.util )

1. Stanza class

Define your custom attribute ( nick )

  private String nick = null;

Define Getter and Setters

 public String getNick() { return this.nick; } public void setNick(String paramString) { this.nick = paramString; }

Edit Constructor Stanza

 protected Stanza(Stanza p) { //add this line nick = p.getNick(); }

Change the addCommonAttributes method

 protected void addCommonAttributes(XmlStringBuilder xml) { //add this line if(getNick()!= null) xml.optAttribute("nick", getNick()); }

2. Class PacketParserUtils

Change parseMessage method

  public static Message parseMessage(XmlPullParser parser) throws XmlPullParserException, IOException, SmackException { //add this line message.setNick(parser.getAttributeValue("", "nick")); }

Now you can simply set the nickname and send the message as follows

 Message message = new Message(); message.setType(Message.Type.chat); message.setStanzaId("123"); message.setTo(number); message.setNick("SHAYAN"); try { connection.sendStanza(message); } catch (NotConnectedException e) { }
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Do not do this, it is not recommended for any reason. Probably, some servers will deprive the attribute or even completely refuse to process the packet. Instead, we recommend adding a custom element.

In fact, such an extension already exists, XEP-0172 :

 <message from='*' to='*' id='123' type='chat'> <nick xmlns='http://jabber.org/protocol/nick'>KASHIF</nick> <body>hello</body> </message>

This may work already with other clients or libraries, so this is a much better solution.

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