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#endif

( 다 안드로이드 소스)
<MainActivity.java>
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Handler;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.format.Formatter;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

import static android.R.attr.id;

public class MainActivity extends AppCompatActivity {

//edittext 선언
private EditText et1, et2, nm;
// 텍스트뷰 선언
private TextView tv4;
// 소켓선언
private Socket socket;
// 소켓 쓰기 설정
private DataOutputStream writeSocket;
// 소켓 읽기 설정
private DataInputStream readSocket;

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