What is firebaseui-android?

FirebaseUI for Android is an open-source library that provides ready-made interface components for connecting an Android app to Firebase, Google's backend-as-a-service platform. Instead of writing all the plumbing code yourself to display database records in a list or build a sign-in screen, FirebaseUI gives you pre-built components that handle those common patterns and wire directly into Firebase services. The library is split into four separate modules, each covering a different Firebase service. The auth module provides a full sign-in flow that supports email and password, phone number, and third-party providers like Google and Facebook. The Firestore and Realtime Database modules provide adapter classes that connect Firebase data collections to Android list views, updating the display automatically when data changes. The storage module provides utilities for downloading and displaying files stored in Firebase Cloud Storage, such as images. Each module is installed by adding a single line to the app's build configuration file. The modules pull in the corresponding Firebase SDK automatically, so there is no need to add Firebase dependencies separately. The repository has a sample app in its app directory that demonstrates how all four modules work in practice, running it requires creating a Firebase project in the Firebase console and downloading a configuration file from there. The library has been through many major versions, and breaking changes between versions are covered in migration guides included in the docs folder. FirebaseUI is maintained by Google and accepts code contributions, though contributors need to sign a license agreement before their pull requests can be accepted.