try {

            String messageStr = "Hello Android!";
            int server_port = 9876;
            DatagramSocket s = new DatagramSocket();
            InetAddress local = InetAddress.getByName("10.0.2.2");
            int msg_length = messageStr.length();
            byte[] message = messageStr.getBytes();
            DatagramPacket p = new DatagramPacket(message, msg_length, local,
                    server_port);
            s.send(p);
        } catch (Exception e) {
        }