Android uses MulticastSocket to implement multicast pictures

public class ComUtil
{
 public static final String BROADCAST_IP = "224.2.2.2";
 public static final int BOADCAST_PORT = 30000;
 private static final int DATA_LEN = 100 * 1024;
 //Define the MulticastSocket instance of this program private MulticastSocket socket = null;
 //Define the IP address of the broadcast private InetAddress broadcastAddress = null;
 //Define the character array that receives network data byte[] inBuff = new byte[DATA_LEN];
 //Create DatagramPacket object ready to be accepted with a specified byte array private DatagramPacket inPacket = new DatagramPacket(inBuff , );
 //Define a DatagramPacket object for sending private DatagramPacket outPacket = null;
 private Handler handler;

 //Constructor, initialize resource public ComUtil(Handler handler) throws Exception
 {
  = handler;
 //Because the MulticastSocket object needs to receive data, there is a specified port socket = new MulticastSocket(BOADCAST_PORT);
 broadcastAddress = (BROADCAST_IP);
 //Add the socket to the specified multicast address (broadcastAddress);
 //Set the datagram sent by this MultcastSocket will be sent to itself (false);
 //Initialize the DatagramSocket for sending, which contains an array of bytes of length 0 outPacket = new DatagramPacket(new byte[0] , 0 , broadcastAddress , BOADCAST_PORT);
 new ReadBroad().start();
 }

 //Tools and methods for broadcasting messages public void broadCast(byte[] msg)
 {
 try
 {
  //Convert msg string to byte array  byte[] buff = msg;
  //Set the byte array in the DatagramPacket for sending  (buff);
  //Send data  (outPacket);
 }
 catch (IOException e)
 {
  ();
 }
 }

 //Continuously read the thread of MulticastSocket class ReadBroad extends Thread
 {
 public void run()
 {
  while (true)
  {
  try
  {
   //Read the data in the Socket   (inPacket);
   Message msg = new Message();
    = 0x123;
    = inBuff;
   (msg);
  }
  catch (IOException e)
  {
   ();
  }
  }
 }
 }
}

public class MainActivity extends Activity
{
 private Button button;
 private ImageView img;
 private ComUtil comUitl;
 Handler handler = new Handler()
 {
 @Override
 public void handleMessage(Message msg)
 {
  if ( == 0x123)
  {
  byte[] result = (byte[]) ;
  ((result , 0 , ));
  }
 }
 };

 @Override
 protected void onCreate(Bundle savedInstanceState)
 {
 (savedInstanceState);
 setContentView(.main_activity);
 try
 {
  comUitl = new ComUtil(handler);
 }
 catch (Exception e)
 {
  ();
 }

 button = (Button) findViewById(.send_img_all);
 img = (ImageView) findViewById(.receiver_img);
 (new ()
 {
  @Override
  public void onClick(View view)
  {
  sendData();
  }
 });
 }

 private void sendData()
 {
 Bitmap bitmap = (getResources() , .wenqing2);
 ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
 ( , 100 , byteArray);
 ();
 final byte[] msg = ();
 new Thread()
 {
  @Override
  public void run()
  {
  (msg);
  }
 }.start();

 try
 {
  ();
 }
 catch (IOException e)
 {
  ();
 }
 }
}