android-kotlin

Modern Android development with Kotlin coroutines, Jetpack Compose, dependency injection, and structured testing. - Covers three-layer architecture (data, domain, UI) with Hilt for dependency injection and Room for local persistence - Jetpack Compose for declarative UI with StateFlow-based state management and lifecycle-aware collection patterns - Coroutines and Flow for asynchronous operations, including repository patterns with network-first and cache-first strategies - MockK and Turbine for unit testing ViewModels, repositories, and flows with proper test dispatcher setup - Includes Gradle Kotlin DSL configuration, detekt/ktlint linting rules, and GitHub Actions CI pipeline - ❌ Blocking coroutines on Main - Never use runBlocking on main thread - ❌ GlobalScope usage - Use structured concurrency with viewModelScope/lifecycleScope - ❌ Collecting flows in init - Use repeatOnLifecycle or collectAsStateWithLifecycle - ❌ Mutable state exposure - Expose StateFlow not MutableStateFlow - ❌ Not handling exceptions in flows - Always use catch operator - ❌ Lateinit for nullable - Use lazy or nullable with ? - ❌ Hardcoded dispatchers - Inject dispatchers for testability - ❌ Not using sealed classes - Prefer sealed for finite state sets - ❌ Side effects in Composables - Use LaunchedEffect / SideEffect - ❌ Unstable Compose parameters - Use stable/immutable types or @Stable