Build a Android Cart Module with expandable recyclerview and sqlite database .

I have my project with me i need some who can help me with a particular module the module consist of four different activities i will explain one of them Barsale activity it fetches data from database and a add button creates a list on the screen with details of that particular product . the user can add different items suppose he added 5 different items in a list when he click on add to cart button i need those items to be displayed in a cart like item1 consists child1 child2 and so and and again when user add 10 more items a diffrent parent will get created in cart activity and its child items . and a delete button on parent in cart class so if he click on delete button it can the whole of child get deleted from internal database. person has to build the cart functionality .