why my items are not showing in wishlist in android studio

I am working on an application where I want to add items in the wishlist section. I have some data which I am fetching from the firestore in recyclerview on each item I have a heart icon when someone clicks on that icon that particular item should be added to the wishlist section. I am new to android please guide me on how can I achieve this or refer to any document thank you

Answer

Do the following thing –

1. Create one collection name with Wishlist
2. When the user clicks on a particular Item heart and adds respective data with the Item Id and userId in Wishlist collection, It will create one document.
3. Fetch data from Wishlist collection to show user wishlist using a query like get data from Wishlist collection by userId using where clause.