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📋 📋 Important Topics Checklist

4 min read · Notion

Use this page to track your preparation progress. Check off topics as you feel confident.

🟢 Kotlin Fundamentals

  • null safety (?., ?:, !!)
  • val vs var
  • Data class, sealed class, enum class
  • Companion object vs Object
  • Extension functions
  • Scope functions (let, apply, also, run, with)
  • Higher-order functions & lambdas
  • inline, noinline, crossinline
  • lazy vs lateinit
  • Generics: in, out, reified
  • Delegation pattern
  • typealias
  • Destructuring declarations
  • Coroutine Channels
  • Result<T> class

🟡 Android Core

  • Activity Lifecycle
  • Fragment Lifecycle
  • Launch Modes (standard, singleTop, singleTask, singleInstance)
  • Explicit vs Implicit Intents
  • Parcelable vs Serializable
  • RecyclerView + DiffUtil
  • ViewBinding
  • Runtime Permissions
  • Broadcast Receivers
  • Services (Foreground, Background, Bound)
  • WorkManager
  • Navigation Component
  • Room Database (Entity, DAO, Database)
  • SharedPreferences / DataStore
  • Handlers, Loopers
  • ViewPager2
  • min/compile/target SDK differences

🔵 Coroutines & Flow

  • launch vs async
  • suspend function
  • Dispatchers (Main, IO, Default)
  • Structured concurrency
  • viewModelScope, lifecycleScope
  • CoroutineExceptionHandler
  • SupervisorJob
  • Cold vs Hot Flow
  • StateFlow vs SharedFlow vs Flow
  • collectLatest, debounce, conflate
  • buffer() for backpressure
  • combine, zip, merge operators
  • snapshotFlow

🟣 Jetpack Compose

  • @Composable rules
  • Recomposition internals
  • remember vs rememberSaveable
  • mutableStateOf, derivedStateOf
  • State hoisting
  • LaunchedEffect, DisposableEffect, SideEffect
  • LazyColumn / LazyRow with keys
  • Modifier system
  • Scaffold, TopAppBar, BottomNavigationBar
  • Navigation in Compose
  • Animations (AnimatedVisibility, animate*AsState)
  • Compose + ViewModel integration
  • collectAsStateWithLifecycle
  • @Stable / @Immutable for performance
  • Compose Compiler Metrics
  • Custom composables / Slot API

🏗️ Architecture

  • MVVM pattern
  • Clean Architecture (layers)
  • UseCase / Interactor pattern
  • Repository pattern
  • MVI pattern
  • Single Source of Truth
  • Sealed class for UI state
  • SOLID principles
  • Dependency Inversion

💉 Dependency Injection

  • DI vs Service Locator
  • Hilt setup (@HiltAndroidApp, @AndroidEntryPoint)
  • @HiltViewModel
  • @Module, @Provides, @Binds
  • Hilt scopes
  • @Qualifier
  • @EntryPoint

🧪 Testing

  • Unit test for ViewModel
  • MainDispatcherRule
  • runTest for coroutines
  • MockK basics
  • Testing StateFlow
  • In-memory Room testing
  • Compose UI testing
  • InstantTaskExecutorRule for LiveData

⚙️ Performance & Memory

  • Memory leak common causes
  • LeakCanary
  • App startup types (cold/warm/hot)
  • ANR detection + StrictMode
  • Compose performance pitfalls
  • @Stable / @Immutable
  • Baseline Profiles
  • Value classes (@JvmInline)

🌐 Kotlin Multiplatform

  • expect / actual
  • Shared module structure
  • KMP with Ktor + SQLDelight
  • KMP limitations
  • Compose Multiplatform status

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