Receiving multiple messages after sending in group chat using asmack

Question

after sending a message it is receiving to the group. But at the same time again I'm receiving all the previous messages. Help me out of this. Here is my code:

send.setOnClickListener(new View.OnClickListener() {            
    public void onClick(View view) {
        to = groupname + "@conference.localhost".toString();
        String text = (textMessage.getText().toString());
        textMessage.setText("");

        muc = new MultiUserChat(connection, to);

        try {
            muc.join(USERNAME);
        } catch (XMPPException e) {
            e.printStackTrace();
        }

        Message msg = new Message(to, Message.Type.groupchat);
        msg.setBody(text);
        if (connection != null) {
            connection.sendPacket(msg);
            Msg data = new Msg();
            data.setMessage(text);
            data.setName(userFrom);
            data.setDate(DateAndTime.getCurrentDate());
            data.setTime(DateAndTime.getCurrentTime());
            data.setSender(true);
            MessageListAdapter.messagesItems.add(data);
            notifyMyAdapter();
        }
    }
});

and here is my receiving code:

public void setConnection(XMPPConnection connection) {

    this.connection = connection;
    if(connection != null) {

        PacketFilter filter = new MessageTypeFilter(Message.Type.groupchat);
        connection.addPacketListener(new PacketListener() {
            @Override
            public void processPacket(Packet packet) {

                Message message = (Message) packet;
                if (message.getBody() != null) {
                    String fromName = StringUtils.parseBareAddress(message.getFrom());
                 Log.i("XMPPChatDemoActivity ", " Text Recieved " + message.getBody() + " from " + fromName);
                    Msg data = new Msg();
                    String subject = message.getSubject();

                    if (subject == null) {
                        data.setMessage(message.getBody());
                        data.setName(NAME);
                        data.setDate(DateAndTime.getCurrentDate());
                        data.setTime(DateAndTime.getCurrentTime());
                        data.setSender(false);
                        MessageListAdapter.messagesItems.add(data);

                    mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            notifyMyAdapter();
                        }
                    });
                } else if (subject.equals("")){
                    data.setMessage(message.getBody());
                    data.setName(NAME);
                    data.setDate(DateAndTime.getCurrentDate());
                    data.setTime(DateAndTime.getCurrentTime());
                    data.setSender(false);
                    MessageListAdapter.messagesItems.add(data);
                    // Add the incoming message to the list view
                    mHandler.post(new Runnable() {
                        public void run() {
                            notifyMyAdapter();
                        }
                    });
                }
            }
        }

        },filter);
    }

}

Answer 1

In MultiUserChat To control the amount of history to receive while joining a room you will need to provide a configured DiscussionHistory object. for more info about MultiUserChat refer this

muc.join(String nickname, String password, DiscussionHistory history, long timeout)

where DiscussionHistory class controls the number of characters or messages to receive when entering a room. The room will decide the amount of history to return if you don't specify a DiscussionHistory while joining a room. for more info refer this

Example :

MultiUserChat muc = new MultiUserChat(connection, to);
DiscussionHistory history = new DiscussionHistory(); history.setMaxStanzas(0);
muc.join("username", "password", history, SmackConfiguration.getPacketReplyTimeout());