How to upload (put) image using Volley

Question

I need to upload image to certain URL. Classic HTTP request building would look lik this:

            HttpClient httpClient = new DefaultHttpClient();
            HttpContext localContext = new BasicHttpContext();
            HttpPost httpPost = new HttpPost(
                    getString(R.string.WebServiceURL)
                            + "/cfc/iphonewebservice.cfc?method=uploadPhoto");

            MultipartEntity entity = new MultipartEntity(
                    HttpMultipartMode.BROWSER_COMPATIBLE);

            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            bitmap.compress(CompressFormat.JPEG, 100, bos);
            byte[] data = bos.toByteArray();
            entity.addPart("photoId", new StringBody(getIntent()
                    .getStringExtra("photoId")));
            entity.addPart("returnformat", new StringBody("json"));
            entity.addPart("uploaded", new ByteArrayBody(data,
                    "myImage.jpg"));
            entity.addPart("photoCaption", new StringBody(caption.getText()
                    .toString()));
            httpPost.setEntity(entity);

In short, suppose that what I need to do is to use httpPost.setEntity() method to put an image into a request.

I already know how to build request using Volley library; one has to override getBody method in com.android.volley.Request class, for example like this:

public byte[] getBody() throws AuthFailureError {
    JsonObject json = new JsonObject();
    Set<String> keySet = mParameters.keySet();
    for (String key : keySet) {
        json.addProperty(key, mParameters.get(key));
    }

    return json.toString().getBytes();
}

Now the problem is how to set entity in Request class? there's no method like setEntity().