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MainActivity.java
package com.example.sockest;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity
{
  
    private String return_msg;
    private EditText mEt;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
      
        initData();

    }
  
    public void initData()
    {
        mEt = (EditText) findViewById(R.id.EditText01);
    }
  
    public void onClickBtn(View v)
    {
        Toast toast = Toast.makeText(getApplicationContext(), mEt.getText().toString(), 0);
        toast.show();
        TCPclient tcpThread = new TCPclient(mEt.getText().toString());
        Thread thread = new Thread(tcpThread);
        thread.start();
    }
  
    private class TCPclient implements Runnable
    {
        private static final String serverIP = "¼­¹ö ¾ÆÀÌÇÇÁÖ¼Ò ÀÔ·Â(000.000.000.000)";
        private static final int serverPort = 9999;    //Æ÷Æ®¹øÈ£
        private Socket inetSocket = null;
        private String msg;

        // private String return_msg;
        public TCPclient(String _msg)
        {
            this.msg = _msg;
        }

        public void run()
        {
            // TODO Auto-generated method stub
            try
            {
                Log.d("TCP", "C: Connecting...");
              
                inetSocket = new Socket(serverIP ,serverPort );
                //inetSocket.connect(socketAddr);

                try
                {
                    Log.d("TCP", "C: Sending: '" + msg + "'");
                    PrintWriter out = new PrintWriter(new BufferedWriter(
                            new OutputStreamWriter(inetSocket.getOutputStream())), true);
                    out.println(msg);

                    BufferedReader in = new BufferedReader(
                            new InputStreamReader(inetSocket.getInputStream()));
                    return_msg = in.readLine();

                    Log.d("TCP", "C: Server send to me this message -->"
                            + return_msg);
                }
                catch (Exception e)
                {
                    Log.e("TCP", "C: Error1", e);
                }
                finally
                {
                    inetSocket.close();
                }
            }
            catch (Exception e)
            {
                Log.e("TCP", "C: Error2", e);
            }
        }
    }
}


activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="vertical" >

    <EditText
       android:id="@+id/EditText01"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content" />

    <Button
       android:id="@+id/Button01"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="Send"
       android:onClick="onClickBtn"/>

</LinearLayout>

AndroidManifest.xml
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<uses-permission android:name="android.permission.INTERNET" />
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