An example analysis of UDP sending for the development of socket programming in Android _android

The example of this article describes the implementation of UDP for the development of socket programming in Android. Share to everyone for your reference. The specific analysis is as follows:

Need to implement the function: the use of UDP socket programming, when pressed the confirmation key, the simulator to send text box data, PC computer network debugging assistant to receive

First, the environment:

Win7 + eclipse + SDK

Second, code:

Package test.soket; Import Com.test_button. 
R 
Import Java.io.DataOutputStream; 
Import java.io.IOException; 
Import Java.net.DatagramPacket; 
Import Java.net.DatagramSocket; 
Import java.net.InetAddress; 
Import Java.net.Socket; 
Import java.net.SocketException; 
Import java.net.UnknownHostException; 
Import android.app.Activity; 
Import Android.os.Bundle; 
Import Android.view.View; 
Import Android.widget.Button; 
Import Android.widget.TextView; 
 public class Test_socket extends activity {public static TextView show; 
 public static Button Press; 
 public static Boolean flag; 
 private static final int max_data_packet_length = 40; 
 Private byte[] buffer = new Byte[max_data_packet_length]; 
 Private Datagrampacket Datapacket; 
 Private Datagramsocket Udpsocket; /** called the activity is a. 
  * * @Override public void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); 
  Setcontentview (R.layout.main); Open control Space show = (TextView) Findviewbyid (R.ID.EDITTEXT1); 
  Press = (Button) Findviewbyid (R.id.button1); 
  Flag = false; 
  Soket_send thread = new Soket_send (); 
  Thread.init (); 
  Thread.Start (); 
  try {udpsocket = new Datagramsocket (5554); 
  catch (SocketException e) {//TODO auto-generated catch block E.printstacktrace (); 
  } datapacket = new Datagrampacket (buffer, max_data_packet_length); String str = "HELLO,JDH"; This is the data to be transmitted byte out [] = Str.getbytes (); 
  The transmission content is decomposed into byte datapacket.setdata (out); 
  Datapacket.setlength (out.length); 
  Datapacket.setport (5554); 
   try {inetaddress broadcastaddr = inetaddress.getbyname ("192.168.0.248"); 
   Datapacket.setaddress (BROADCASTADDR); 
  Udpsocket.send (Datapacket); 
  catch (IOException e) {//TODO auto-generated catch block E.printstacktrace (); 
    Press.setonclicklistener (New Button.onclicklistener () {@Override public void OnClick (View v) { 
    Flag = true; 
   /* String str = "HELLO,JDH"; This is the data to be transmitted byte out [] = Str.getbytes (); 
    The transmission content is decomposed into byte datapacket.setdata (out); 
    Datapacket.setlength (out.length); 
    *//Get input box text charsequence str =test_socket.show.gettext (); 
    byte out[] = Str.tostring (). GetBytes (); 
    Datapacket.setdata (out); 
    Datapacket.setlength (out.length); 
     try {inetaddress broadcastaddr = inetaddress.getbyname ("192.168.0.248"); 
     Datapacket.setaddress (BROADCASTADDR); 
    Udpsocket.send (Datapacket); 
    catch (IOException e) {//TODO auto-generated catch block E.printstacktrace (); 
 } 
   } 
  }); } 
}

The interface is as follows:

Note: In the emulator IP is native IP, the port is the emulator name

I hope this article will help you with your Android program.