How to send a “multipart/form-data” POST in Android with Volley

Question

Has anyone been able to accomplish sending a multipart/form-data POST in Android with Volley yet? I have had no success trying to upload an image/png

Answer 1

A very simple approach for the dev who just want to send POST parameters in multipart request.

Make the following changes in class which extends Request.java

First define these constants :

String BOUNDARY = "s2retfgsGSRFsERFGHfgdfgw734yhFHW567TYHSrf4yarg"; //This the boundary which is used by the server to split the post parameters.
String MULTIPART_FORMDATA = "multipart/form-data;boundary=" + BOUNDARY;

Add a helper function to create a post body for you :

private String createPostBody(Map params) {
        StringBuilder sbPost = new StringBuilder();
        if (params != null) {
            for (String key : params.keySet()) {
                if (params.get(key) != null) {
                    sbPost.append("\r\n" + "--" + BOUNDARY + "\r\n");
                    sbPost.append("Content-Disposition: form-data; name=\"" + key + "\"" + "\r\n\r\n");
                    sbPost.append(params.get(key).toString());
                }
            }
        }
        return sbPost.toString();
    } 

Override getBody() and getBodyContentType

public String getBodyContentType() {
    return MULTIPART_FORMDATA;
}

public byte[] getBody() throws AuthFailureError {
        return createPostBody(getParams()).getBytes();
}