The app’s main functionality was to allow the user to search for any Brazilian address using its postal code (CEP) and get the relevant information, such as the street name, neighborhood, city, and state. The app also stored the previous searches and displayed them in a list for easy access.

I chose Kotlin as the programming language for the app, because of its modern and concise features that make Android development easier and more enjoyable. I also followed the MVVM (Model-View-ViewModel) architectural pattern, which separates the user interface logic from the business logic and the data layer, and creates modular, testable, and maintainable code. I used the ViaCEP API, a free and open source web service, to fetch the address data from the internet, and SQL, a standard language for managing relational databases, to store and retrieve the data locally. I learned a lot from the project and received positive feedback from the users.