postImage() you can add to your MyApi class. Read more about a multipart request at http://stackoverflow.com/a/9082243

postImage

	public Request<?> postImage(
			String token,
			long l,
			File imageFile,
			Listener<String> listener,
			ErrorListener errorListener) {

		String url = "http://yoururl.com/post-image";

		PhotoMultipartRequest<String> req = new PhotoMultipartRequest<String>(
				url, 
				errorListener, 
				listener, 
				imageFile);

		req.setRetryPolicy(new DefaultRetryPolicy(
				POST_TIMEOUT,
				2, 
				DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));

		return mQueue.add(req);
	}