presence_message_adapter.java

package com.test.groupchatapp;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

/**
 * @author Frank Ibem.
 */
public class MessageAdapter extends ArrayAdapter<Message> {
    private LayoutInflater inflater;

    public MessageAdapter(Context context) {
        super(context, -1);
        inflater = LayoutInflater.from(context);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Message mes = getItem(position);
        if (mes.isPresence()) {
            return getPresenceView(mes, parent);
        } else {
            return getNormalView(mes, parent);
        }
    }

    /**
     * Returns the view to be used for a presence message
     */
    private View getPresenceView(Message mes, ViewGroup parent) {
        TextView presence;

        View view = inflater.inflate(R.layout.presence_item, parent, false);
        presence = (TextView) view.findViewById(R.id.text_presence);
        presence.setText(mes.getMessage());

        return view;
    }

    /**
     * Returns a view to be used for a normal message
     */
    private View getNormalView(Message mes, ViewGroup parent) {
        TextView userName, message;

        View view = inflater.inflate(R.layout.message_item, parent, false);
        userName = (TextView) view.findViewById(R.id.text_username);
        message = (TextView) view.findViewById(R.id.text_message);

        // Set username and message
        userName.setText(mes.getUserName());
        message.setText(mes.getMessage());

        return view;
    }
}