How to implement adding items to the cart in an Android application?

Question

Android

I am making an online store, naturally there is a basket of selected goods. The cart is local. I see two options. The first is with the help of a database - for example, Room. The second one is in sharedPreferences. Everything has to be reactive. The database is convenient, but you don’t want to connect the database for the sake of the basket. In SP, it's somehow a crutch to do this - it seems to me so. Ask for advice from more experienced developers. Thank you!

Answer 1

DB

Answer 2

and that there is no local cache of the list of goods, how without a database?
so it can be stored in SP, usually serialized in json