Android Application to Send a File to Remote Server

This simple Android application sends a file to a remote server. In this example code server runs on local host. When the Send button is clicked the file is sent to the server.

Android Client Application
SimpleClientActivity.java

/*
 * This is a simple Android mobile client
 * This application send any file to a remort server when the 
 * send button is pressed
 * Author by Lak J Comspace
 */

package lakj.comspace.simpleclient;

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
    
    try {
     
     client = new Socket("10.0.2.2", 4444);
     
     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();
    }
          

   }
  });

 }
}

main.xml

AndroidManifest.xml

Server Application
main.java

/*
 * This is a simple server application
 * This server receive a file from a Android client and save it in a given place.
 * Author by Lak J Comspace
 */
package simpleserver;

import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class Main {

    private static ServerSocket serverSocket;
    private static Socket clientSocket;
    private static InputStream inputStream;
    private static FileOutputStream fileOutputStream;
    private static BufferedOutputStream bufferedOutputStream;
    private static int filesize = 10000000; // filesize temporary hardcoded 
    private static int bytesRead;
    private static int current = 0;

    public static void main(String[] args) throws IOException {


        serverSocket = new ServerSocket(4444);  //Server socket

        System.out.println("Server started. Listening to the port 4444");


        clientSocket = serverSocket.accept();


        byte[] mybytearray = new byte[filesize];    //create byte array to buffer the file

        inputStream = clientSocket.getInputStream();
        fileOutputStream = new FileOutputStream("D:\\output.jpg");
        bufferedOutputStream = new BufferedOutputStream(fileOutputStream);

        System.out.println("Receiving...");

        //following lines read the input slide file byte by byte
        bytesRead = inputStream.read(mybytearray, 0, mybytearray.length);
        current = bytesRead;

        do {
            bytesRead = inputStream.read(mybytearray, current, (mybytearray.length - current));
            if (bytesRead >= 0) {
                current += bytesRead;
            }
        } while (bytesRead > -1);


        bufferedOutputStream.write(mybytearray, 0, current);
        bufferedOutputStream.flush();
        bufferedOutputStream.close();
        inputStream.close();
        clientSocket.close();
        serverSocket.close();

        System.out.println("Sever recieved the file");

    }
}