android receive and send data through wifi connection to hardware

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class SimpleClientActivity extends Activity {

 private Socket client;
 private FileInputStream fileInputStream;
 private BufferedInputStream bufferedInputStream;
 private OutputStream outputStream;
 private Button button;
 private TextView text;

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

  button = (Button) findViewById(R.id.button1);   //reference to the send button
  text = (TextView) findViewById(R.id.textView1);   //reference to the text view

  //Button press event listener
  button.setOnClickListener(new View.OnClickListener() {

   public void onClick(View v) {


    File file = new File("/mnt/sdcard/input.jpg"); //create file instance, file to transfer or any data

    try {

     client = new Socket("10.0.2.2", 4444);// ip address and port number of ur hardware device

     byte[] mybytearray = new byte[(int) file.length()]; //create a byte array to file

     fileInputStream = new FileInputStream(file);
     bufferedInputStream = new BufferedInputStream(fileInputStream);  

     bufferedInputStream.read(mybytearray, 0, mybytearray.length); //read the file

     outputStream = client.getOutputStream();

     outputStream.write(mybytearray, 0, mybytearray.length); //write file to the output stream byte by byte
     outputStream.flush();
     bufferedInputStream.close();
     outputStream.close();
           client.close();

           text.setText("File Sent");


    } catch (UnknownHostException e) {
     e.printStackTrace();
    } catch (IOException e) {
     e.printStackTrace();
    }


   }
  });

 }
}

// to send message u can also use below code

     public static String ipAddress;// ur ip
    public static int portNumber;// portnumber

    private Socket client;

    private OutputStreamWriter printwriter;
    private String message;


new Thread(new Runnable() {

                    @Override
                    public void run() {
                        // TODO Auto-generated method stub
                        try {
                            client = new Socket(ipAddress, portNumber);
                            printwriter = new OutputStreamWriter(client
                                    .getOutputStream(), "ISO-8859-1");
                            printwriter.write("any message");
                            printwriter.flush();
                            printwriter.close();
                            client.close();
                        }

                        catch (UnknownHostException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }).start();