moai-lang-kotlin

Kotlin best practices for Android emphasize MVVM architecture with Jetpack Compose for UI, structured concurrency using coroutines for async operations, and dependency injection. This approach ensures testable, maintainable code that leverages Kotlin's null safety and extension functions.

Kotlin Multiplatform (KMM) enables shared business logic across Android, backend, and web targets. You organize code into common, Android, and backend modules, allowing Spring Boot or Ktor backends to share data models and domain logic with Android apps while keeping platform-specific APIs separate.

MockK and Kotest provide idiomatic testing for Kotlin across Android and backend contexts. MockK handles mocking with Kotlin syntax, while Kotest offers property-based testing and readable assertions. Together they enable unit, integration, and behavioral testing aligned with coroutine-based concurrent code.

Gradle Kotlin DSL replaces Groovy for type-safe, IDE-friendly build scripts. It integrates with dependency management tools to version libraries consistently across multiplatform modules and enables gradle tasks for scaffolding, testing, and cross-platform builds.

Compose Multiplatform extends Jetpack Compose beyond Android to share declarative UI code across desktop, web, and iOS. It maintains a single UI codebase while platform modules handle native integration, reducing duplication in KMM projects.

Structured concurrency with coroutines provides cancellation safety and parent-child job relationships for both Ktor backends and Android services. Launch and async builders, supervisors, and exception handling ensure non-blocking I/O and predictable lifecycle management.