Shop List Simple

Just a tiny program to manage your Shopping List, with a couple of screens and no unwanted complexity: The yellow one to checkout everything you put into your cart, with prices adding up, and the blue one, to choose what you want to bring from your next expedition to the shop.
This is just the first version, I plan to add a few more abilities, and I'd like to hear your suggestions and criticisms. I've been only able to test it on my own phone, so please be kind with unexpected errors and lousy design :)