facturefacile

This app demonstrates the use of Android, Kotlin, and Firebase Firestore to create a simple invoice management app.

Design patterns

• MVVM
• Dependency injection, using Composition Root method.
• Factory pattern, and façade pattern
• Singleton pattern
• Observer pattern
• Repository pattern

Android

• Activity + Fragment, using viewModel, LiveData
• Two-way Data Binding

Kotlin

• Extension functions
• Coroutines
• Data classes

Data persistence

• Room, SharedPreferences, Firebase Firestore

REST API

• Retrofit, Moshi, OkHttp and custom trust managers.