title: sending and receiving UDP packet on datagram socket in android
body: <p>I have two classes,one sender class and the other is the receiver class.Both of the sending and receiving apps stops after few seconds and close down.
  My sender class is :</p>
  
  <pre><code>    public class MainActivity extends Activity {
  InetAddress receiverAddress;
  DatagramSocket datagramSocket;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
  
      try {
          datagramSocket = new DatagramSocket(4444);
      } catch (SocketException e1) {
          // TODO Auto-generated catch block
          e1.printStackTrace();
      }
  
      byte[] buffer = "0123456789".getBytes();
      byte[] address="192.168.1.101".getBytes();
  
      try {
          receiverAddress = InetAddress.getByAddress(address);
      } catch (UnknownHostException e1) {
          // TODO Auto-generated catch block
          e1.printStackTrace();
      }
  
      DatagramPacket packet = new DatagramPacket(
              buffer, buffer.length, receiverAddress, 4444);
  
      try {
          datagramSocket.send(packet);
      } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
      }
  
  
  
  
  }
  </code></pre>
  
  <p>My receiving or listening class is:</p>
  
  <pre><code>public class MainActivity extends Activity {
  DatagramSocket datagramSocket;
  DatagramPacket packet;
  TextView tv1;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      tv1=(TextView)findViewById(R.id.textView1);
       try {
          datagramSocket = new DatagramSocket(80);
      } catch (SocketException e1) {
          // TODO Auto-generated catch block
          e1.printStackTrace();
      }
  
      byte[] buffer = new byte[10];
       packet = new DatagramPacket(buffer, buffer.length);
  
      try {
          datagramSocket.receive(packet);
      } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
      }
      byte[] buff = packet.getData();
  
  tv1.setText(buff.toString());
  
  }
  </code></pre>
  
  <p>Thanks in advance for the help.</p>