MultiUserChat with XMPP - Android Tutorial

In this post I will show you how to build an application with multi user chat running on XMPP server.

For a small introduction read this post: Introduction to xmpp
Now let's go fucking coding!
You can download the Jar file from here

Step 1 - Define some parameters

    public static final String HOST = "jabber.cz";
    public static final int PORT = 5222;
    public static final String SERVICE = "jabber.cz";

    String mNickName;
    String mGroupChatName;
    private MultiUserChatmMultiUserChat;
    private XMPPConnectionmXmppConnection;
    private ConnectionConfiguration mConnectionConfiguration;

Step 2 - Create a connection

 mConnectionConfiguration = 
new ConnectionConfiguration(HOST, PORT, SERVICE);
mConnectionConfiguration.setRosterLoadedAtLogin(false);
mXmppConnection = new XMPPConnection(mConnectionConfiguration);
mConnectionConfiguration.setSASLAuthenticationEnabled(true);
SASLAuthentication.supportSASLMechanism("PLAIN", 0);
mXmppConnection.connect();

Step 3 - Login and set status

mXmppConnection.login(USERNAME, PASSWORD, NICK_NAME);
// Set the status to available
Presence presence = new Presence(Presence.Type.available);
mXmppConnection.sendPacket(presence);

Step 4 - Set the Mutliuser Chat

// Create a MultiUserChat using a Connection for a room 
// (room name as the second parameter)
mMultiUserChat = new MultiUserChat(mXmppConnection, mGroupChatName);
mMultiUserChat.create(mNickName);
mMultiUserChat.sendConfigurationForm(new Form(Form.TYPE_SUBMIT));
mMultiUserChat.join(mNickName);

Step 5 - Received messages

// Add a packet listener to get messages sent to us
PacketFilter filter = new MessageTypeFilter(Message.Type.groupchat);
mXmppConnection.addPacketListener(new PacketListener()
{
    @Override
    public void processPacket(Packet packet) 
    {
        Message message = (Message) packet;
        if (message.getBody() != null)
        {
            String from = message.getFrom();
            String Body = message.getBody();
            // Add incoming message to the list view or similar
        }
    }
}, filter);

Step 6 - Send message

// import org.jivesoftware.smack.packet.Message;
Message msg = new Message(to, Message.Type.groupchat);
msg.setBody(msgText);
mMultiUserChat.sendMessage(msg);