TCP 통신

public class TCP_Client extends AsyncTask {
 
    protected static String SERV_IP = "server ip"; 
    protected static int PORT = 0000;
 
    @Override
    protected Object doInBackground(Object... params) {
        // TODO Auto-generated method stub
 
        
        try {
            Socket sock = new Socket(SERV_IP, PORT);
            DataInputStream input = new DataInputStream(sock.getInputStream());
            DataOutputStream output = new DataOutputStream(sock.getOutputStream());
 
            
            try {
                
                WriteSocket(output);
//                ReadSock(input);
 
 
            } catch (IOException e) {
                e.printStackTrace();
            }
 
        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
 
        return null;
    }
 
    public void WriteSocket(DataOutputStream data) throws IOException {
        // data send
        byte[] bData = new byte[2];
        
 
        bData[0] = (byte) 0x00;
        bData[1] = (byte) 0x00;
   
        
        data.write(bData);
    }
 
    public void ReadSock(DataInputStream data) throws IOException {
        // data recieve
        byte[] datafile = null;
 
        data.read(datafile);
 
    }
}

public class MainActivity extends Activity {
 
    private Button btn;
    TCP_Client tc;
 
    public void onCreate(Bundle savedInstanceState) {
 
        super.onCreate(savedInstanceState);
 
        setContentView(R.layout.activity_main);
 
        btn = (Button) findViewById(R.id.Button01);
        btn.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                tc = new TCP_Client();
                tc.execute(this);
            }
        });
 
    }
 
}