Android send large files via socket

Question

At the moment I'm trying to create a little socket application for my Android device.

I would like to send large files (~500MB) via a socket connection to my Laptop/PC or whatever. I'm using a socket client on my Android device to connect to my socket server on my PC but, when I try to send a test field (~460MB) my app crashes and it says:

"Throwing OutOfMemoryError "Failed to allocate a 441616290 byte allocationwith 4194304 free bytes and 90MB until OOM""

I guess my client cannot handle this file-size. So my question: is there a way to handle such big files with a TCP socket connection?. My Code works fine with little files (e.g 5MB) but it fails with bigger files.

This is what I have so far:

Client side running on my android device:

private class Connecting extends AsyncTask<String, Integer, String>
{
    @Override
    protected String doInBackground(String... serverAdd) 
    {
        String filePath = "Path to file";

        File sdFile = new File(filePath);

        try {

            client = new Socket("ip", "port");

            outputStream = client.getOutputStream();                
            byte[] buffer = new byte[1024];
            FileInputStream in = new FileInputStream(sdFile);
            int rBytes;
            while((rBytes = in.read(buffer, 0, 1024)) != -1)
            {
              outputStream.write(buffer, 0, rBytes);
            }

            outputStream.flush();
            outputStream.close();
            client.close(); 


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

        return null;
    }
}

Server side:

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;
private static int bytesRead;
private static int current = 0;

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

    serverSocket = new ServerSocket(10898);

    System.out.println("Server started. Listening to the port 10898");

    clientSocket = serverSocket.accept();

    byte[] mybytearray = new byte[filesize];   

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

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

    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");

}
}

Greetz

[EDIT]: Client code.

You need to break your file up into smaller files, often called chunks. Here is a example, in C: stackoverflow.com/questions/1628587/… — Cookster
– Cookster, Commented Jul 15, 2015 at 16:33
Don't read the entire file in at once, do it in smaller chunks. — Buddy
– Buddy, Commented Jul 15, 2015 at 16:34
Ok thank you for that info i need some time to look into this code because i am no familiar with c. — Makky227
– Makky227, Commented Jul 15, 2015 at 16:36
Just use the same code for receiving that you're using for sending. No need to read the entire input into memory before you write it to the file. — user207421
– user207421, Commented Nov 14, 2016 at 4:45

Community · Accepted Answer · 2017-05-23 12:13:40Z

5

Here is sample code for Java on how to chunk a file up. You can adopt this to your TCP/IP client-server application. More on chunking is available here (Java - Read file by chunks?), where I took the sample from.

char[] myBuffer = new char[1024];
int bytesRead = 0;
BufferedReader in = new BufferedReader(new FileReader("foo.txt"));
while ((bytesRead = in.read(myBuffer, 0, 1024)) != -1)
{
    ...
}

edited May 23, 2017 at 12:13

CommunityBot

11 silver badge

answered Jul 15, 2015 at 16:36

Cookster

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1 Comment

Makky227 Over a year ago

ok that helped me i found my mistake and it is sending the file to my server. Tanks a lot to all of you :)

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