Clean Architecture in Jetpack Compose — Layer Design Guide

Jetpack Compose enables clean architecture by separating concerns into distinct layers:

Domain Layer

• Use cases with operator invoke() for single responsibility
• Pure functions without Android dependencies
• Entity models independent from UI state

Data Layer

• Repository interfaces defining data contracts
• Local (Room) and remote (Retrofit) data sources
• Mapper functions for Entity ↔ Domain conversions

Presentation Layer

• ViewModel state management
• Composables as pure rendering functions
• MutableState for reactive UI updates

Dependency Injection with Hilt

@Module
@InstallIn(SingletonComponent::class)
object RepositoryModule {
    @Provides
    fun provideUserRepository(
        remoteSource: UserRemoteDataSource,
        localSource: UserLocalDataSource
    ): UserRepository = UserRepositoryImpl(remoteSource, localSource)
}

Repository Pattern

Implement repository interfaces to abstract data sources:

interface UserRepository {
    suspend fun getUser(id: String): Result<User>
}

This structure keeps your Compose code clean, testable, and maintainable.

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