TCP/IP 예제 (android)

출처: http://goo.gl/pQKG64

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package com.google.zxing.client.android; import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; import java.net.Socket; import java.net.URL; import java.net.URLConnection;   import org.apache.http.util.ByteArrayBuffer; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast;    public class NewClient extends Activity {  private String html = "";  private Handler mHandler;      private Socket socket;  private String name;  private BufferedReader networkReader;  private BufferedWriter networkWriter;  //private String ip = "121.161.14.246"; // SERVER IP를 잡습니다.  //private String ip = "192.168.1.238"; // SERVER IP를 잡습니다.  private String ip = "192.168.0.8"; // SERVER IP를 잡습니다.  private int port = 4040; // PORT를 설정합니다.     public boolean Socket_State = false;     private final CaptureActivity activity;     public NewClient(CaptureActivity activity, String sendstring)  {   this.activity = activity;         Log.d("hslee","Program Start!");   try   {    setSocket(ip, port, sendstring);         if(Socket_State)    {     Log.d("hslee","Server Connect!");     checkUpdate.start();    }   }   catch (IOException e1)   {    Socket_State = false;    e1.printStackTrace();   }      }           @Override  protected void onStop() {    super.onStop();    try   {    socket.close();   }   catch (IOException e)   {    // TODO Auto-generated catch block    e.printStackTrace();   }  }        public void SendSocket(String msg)     {      if (msg != "" && Socket_State)   {    PrintWriter out = new PrintWriter(networkWriter, true);     out.println(msg);    //out.print(msg);    Log.d("hslee","SendMsg:" + msg);   }      }                 private Thread checkUpdate = new Thread()  {   public void run()   {    try    {     String line;     while (true)     {      line = networkReader.readLine();             if(line == null)      {       onStop();       Log.d("hslee", "Server DisConnect");       break;      }             Message message = Message.obtain(activity.getHandler(), R.id.recive_socketmsg, line);      message.sendToTarget();      Log.d("hslee","ReciveMsg:" + line);     }    }    catch (Exception e)    {     Log.d("hslee", "Server DisConnect");    }   }  };     private Runnable showUpdate = new Runnable()  {   public void run()   {    Toast.makeText(NewClient.this, "Coming word: " + html,      Toast.LENGTH_SHORT).show();   }  };           public void setSocket(String ip, int port, String msg) throws IOException  {   try   {    socket = new Socket(ip, port);         networkWriter =     new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));    networkReader =     new BufferedReader(new InputStreamReader(socket.getInputStream()));         Socket_State = true;         SendSocket(msg);    socket.close();   }   catch (IOException e)   {    Socket_State = false;    Log.d("hslee","Server Connect Faild");    System.out.println(e);    e.printStackTrace();   }  } }