shravyapatel2803/android_app ? reverse-engineered prompt

Build me an Android app for a small business bill generator.

I want a simple, clean app where I can create new bills by adding a customer, entering item names, quantities, and prices, then saving the total. It should also let me manage customer details, keep track of stock items, and update inventory when things are added or sold.

I need a bill history screen too, so I can browse past bills and search or filter them when needed. Please make it easy to use and practical for daily billing, not flashy.

If possible, add biometric login with fingerprint or face unlock so the app stays private. Use a straightforward interface that feels polished and works well on a phone. If you need to look up any current Android docs or best practices, feel free to do that.