[펌] 안드로이드 UDP 내용

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UDP-Networking - within the Emulator

What you will learn: You will learn how to setup a UDP-Connection within the Emulator.

Problems/Questions: Write it right below...

Difficulty: 2 of 5

What it will look like:

"S:" stands for server, "C:" stands for Client:

Java:

D/UDP(1515): S: Connecting... D/UDP(1515): S: Receiving... D/UDP(1515): C: Connecting... D/UDP(1515): C: Sending: 'Hello from Client' D/UDP(1515): S: Received: 'Hello from Client' D/UDP(1515): S: Done. D/UDP(1515): C: Sent. D/UDP(1515): C: Done.

Description:
0.) The MainActivity will do nothing, except to start 2 Threads. The first will be the Server waiting for a packet, that will be sent by the second Thread, the Client, 500ms later.
This is the simple MainActivity:

Java:

package org.anddev.android.udpconnection; import android.app.Activity; import android.os.Bundle; public class UDPConnection extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle icicle) {         super.onCreate(icicle);         setContentView(R.layout.main);                 /* Kickoff the Server, it will          * be 'listening' for one client packet */         new Thread(new Server()).start();         /* GIve the Server some time for startup */         try {                Thread.sleep(500);           } catch (InterruptedException e) { }                    // Kickoff the Client         new Thread(new Client()).start();     } }

1.) The Server waiting for one packet.

Java:

package org.anddev.android.udpconnection; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import android.util.Log; public class Server implements Runnable {      public static final String SERVERIP = "127.0.0.1"; // 'Within' the emulator!      public static final int SERVERPORT = 4444;      @Override      public void run() {           try {                /* Retrieve the ServerName */                InetAddress serverAddr = InetAddress.getByName(SERVERIP);                Log.d("UDP", "S: Connecting...");                /* Create new UDP-Socket */                DatagramSocket socket = new DatagramSocket(SERVERPORT, serverAddr);                /* By magic we know, how much data will be waiting for us */                byte[] buf = new byte[17];                /* Prepare a UDP-Packet that can                 * contain the data we want to receive */                DatagramPacket packet = new DatagramPacket(buf, buf.length);                Log.d("UDP", "S: Receiving...");                /* Receive the UDP-Packet */                socket.receive(packet);                Log.d("UDP", "S: Received: '" + new String(packet.getData()) + "'");                Log.d("UDP", "S: Done.");           } catch (Exception e) {                Log.e("UDP", "S: Error", e);           }      } }

2.) The Client that sends just one packet to the Server.

Java:

package org.anddev.android.udpconnection; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import android.util.Log; public class Client implements Runnable {      @Override      public void run() {           try {                // Retrieve the ServerName                InetAddress serverAddr = InetAddress.getByName(Server.SERVERIP);                                Log.d("UDP", "C: Connecting...");                /* Create new UDP-Socket */                DatagramSocket socket = new DatagramSocket();                                /* Prepare some data to be sent. */                byte[] buf = ("Hello from Client").getBytes();                                /* Create UDP-packet with                 * data & destination(url+port) */                DatagramPacket packet = new DatagramPacket(buf, buf.length, serverAddr, Server.SERVERPORT);                Log.d("UDP", "C: Sending: '" + new String(buf) + "'");                                /* Send out the packet */                socket.send(packet);                Log.d("UDP", "C: Sent.");                Log.d("UDP", "C: Done.");           } catch (Exception e) {                Log.e("UDP", "C: Error", e);           }      } }

Regards,
plusminus
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