Android Kotlin Apps

A hands-on collection of Android applications built while deepening Kotlin and Android SDK knowledge beyond university coursework. Each sub-project targets a specific architectural pattern or Android API surface, making it easy to reference individual patterns in isolation.

What’s inside

The repository is structured as a monorepo of small, focused apps rather than one large project. Each app is self-contained with its own build.gradle, so you can open any of them independently in Android Studio.

Architecture patterns explored

• MVVM with ViewModel + LiveData / StateFlow — separation of concerns, reactive UI updates without tight coupling to the Activity lifecycle
• Jetpack Compose — declarative UI, recomposition, state hoisting, side effects, and custom themes
• Room + DAO — local persistence with SQLite under the hood, migrations, and type converters
• Hilt dependency injection — constructor injection, @HiltViewModel, scoped components

Networking

• Ktor HTTP client — async REST calls, JSON deserialization with kotlinx.serialization, error handling and retry logic
• API integration patterns including suspend functions, coroutine scopes in ViewModel, and Flow-based data streams

Testing

• Unit tests with JUnit 4/5 and Kotlin coroutines test library (runTest, TestCoroutineDispatcher)
• UI tests with Espresso and Compose UI test APIs

Key learnings

Working through these projects solidified understanding of the Android component lifecycle, how Compose handles state vs. side effects, and why dependency injection frameworks matter at scale. The Hilt setup in particular demonstrates how to avoid the “ViewModel factory boilerplate” problem that makes Android code painful without DI.