{"slug":"loulanyue-android-clean-architecture","name":"android-clean-architecture","description":"Clean Architecture patterns for Android and Kotlin Multiplatform projects — module structure, dependency rules, UseCases, Repositories, and data layer patterns.","long_description":"---\nname: android-clean-architecture\ndescription: Clean Architecture patterns for Android and Kotlin Multiplatform projects — module structure, dependency rules, UseCases, Repositories, and data layer patterns.\nsource_path: skills/android-clean-architecture/SKILL.md\norigin: ECC\n---\n\n# Android Clean Architecture\n\nClean Architecture patterns for Android and KMP projects. Covers module boundaries, dependency inversion, UseCase/Repository patterns, and data layer design with Room, SQLDelight, and Ktor.\n\n## When to Activate\n\n- Structuring Android or KMP project modules\n- Implementing UseCases, Repositories, or DataSources\n- Designing data flow between layers (domain, data, presentation)\n- Setting up dependency injection with Koin or Hilt\n- Working with Room, SQLDelight, or Ktor in a layered architecture\n\n## Module Structure\n\n### Recommended Layout\n\n```\nproject/\n├── app/ # Android entry point, DI wiring, Application class\n├── core/ # Shared utilities, base classes, error types\n├── domain/ # UseCases, domain models, repository interfaces (pure Kotlin)\n├── data/ # Repository implementations, DataSources, DB, network\n├── presentation/ # Screens, ViewModels, UI models, navigation\n├── design-system/ # Reusable Compose components, theme, typography\n└── feature/ # Feature modules (optional, for larger projects)\n ├── auth/\n ├── settings/\n └── profile/\n```\n\n### Dependency Rules\n\n```\napp → presentation, domain, data, core\npresentation → domain, design-system, core\ndata → domain, core\ndomain → core (or no dependencies)\ncore → (nothing)\n```\n\n**Critical**: `domain` must NEVER depend on `data`, `presentation`, or any framework. It contains pure Kotlin only.\n\n## Domain Layer\n\n### UseCase Pattern\n\nEach UseCase represents one business operation. Use `operator fun invoke` for clean call sites:\n\n```kotlin\nclass GetItemsByCategoryUseCase(\n private val repository: ItemRepository\n) {\n suspend operator fun invoke(category: String): Result> {\n return repository.getItemsByCategory(category)\n }\n}\n\n// Flow-based UseCase for reactive streams\nclass ObserveUserProgressUseCase(\n private val repository: UserRepository\n) {\n operator fun invoke(userId: String): Flow {\n return repository.observeProgress(userId)\n }\n}\n```\n\n### Domain Models\n\nDomain models are plain Kotlin data classes — no framework annotations:\n\n```kotlin\ndata class Item(\n val id: String,\n val title: String,\n val description: String,\n val tags: List,\n val status: Status,\n val category: String\n)\n\nenum class Status { DRAFT, ACTIVE, ARCHIVED }\n```\n\n### Repository Interfaces\n\nDefined in domain, implemented in data:\n\n```kotlin\ninterface ItemRepository {\n suspend fun getItemsByCategory(category: String): Result>\n suspend fun saveItem(item: Item): Result\n fun observeItems(): Flow>\n}\n```\n\n## Data Layer\n\n### Repository Implementation\n\nCoordinates between local and remote data sources:\n\n```kotlin\nclass ItemRepositoryImpl(\n private val localDataSource: ItemLocalDataSource,\n private val remoteDataSource: ItemRemoteDataSource\n) : ItemRepository {\n\n override suspend fun getItemsByCategory(category: String): Result> {\n return runCatching {\n val remote = remoteDataSource.fetchItems(category)\n localDataSource.insertItems(remote.map { it.toEntity() })\n localDataSource.getItemsByCategory(category).map { it.toDomain() }\n }\n }\n\n override suspend fun saveItem(item: Item): Result {\n return runCatching {\n localDataSource.insertItems(listOf(item.toEntity()))\n }\n }\n\n override fun observeItems(): Flow> {\n return localDataSource.observeAll().map { entities ->\n entities.map { it.toDomain() }\n }\n }\n}\n```\n\n### Mapper Pattern\n\nKeep mappers as extension functions near the data models:\n\n```kotlin\n// In data layer\nfun ItemEntity.toDomain() = Item(\n id = id,\n title = title,\n description = description,\n tags = tags.split(\"|\"),\n status = Status.valueOf(status),\n category = category\n)\n\nfun ItemDto.toEntity() = ItemEntity(\n id = id,\n title = title,\n description = description,\n tags = tags.joinToString(\"|\"),\n status = status,\n category = category\n)\n```\n\n### Room Database (Android)\n\n```kotlin\n@Entity(tableName = \"items\")\ndata class ItemEntity(\n @PrimaryKey val id: String,\n val title: String,\n val description: String,\n val tags: String,\n val status: String,\n val category: String\n)\n\n@Dao\ninterface ItemDao {\n @Query(\"SELECT * FROM items WHERE category = :category\")\n suspend fun getByCategory(category: String): List\n\n @Upsert\n suspend fun upsert(items: List)\n\n @Query(\"SELECT * FROM items\")\n fun observeAll(): Flow>\n}\n```\n\n### SQLDelight (KMP)\n\n```sql\n-- Item.sq\nCREATE TABLE ItemEntity (\n id TEXT NOT NULL PRIMARY KEY,\n title TEXT NOT NULL,\n description TEXT NOT NULL,\n tags TEXT NOT NULL,\n status TEXT NOT NULL,\n category TEXT NOT NULL\n);\n\ngetByCategory:\nSELECT * FROM ItemEntity WHERE category = ?;\n\nupsert:\nINSERT OR REPLACE INTO ItemEntity (id, title, description, tags, status, category)\nVALUES (?, ?, ?, ?, ?, ?);\n\nobserveAll:\nSELECT * FROM ItemEntity;\n```\n\n### Ktor Network Client (KMP)\n\n```kotlin\nclass ItemRemoteDataSource(private val client: HttpClient) {\n\n suspend fun fetchItems(category: String): List {\n return client.get(\"api/items\") {\n parameter(\"category\", category)\n }.body()\n }\n}\n\n// HttpClient setup with content negotiation\nval httpClient = HttpClient {\n install(ContentNegotiation) { json(Json { ignoreUnknownKeys = true }) }\n install(Logging) { level = LogLevel.HEADERS }\n defaultRequest { url(\"https://api.example.com/\") }\n}\n```\n\n## Dependency Injection\n\n### Koin (KMP-friendly)\n\n```kotlin\n// Domain module\nval domainModule = module {\n factory { GetItemsByCategoryUseCase(get()) }\n factory { ObserveUserProgressUseCase(get()) }\n}\n\n// Data module\nval dataModule = module {\n single { ItemRepositoryImpl(get(), get()) }\n single { ItemLocalDataSource(get()) }\n single { ItemRemoteDataSource(get()) }\n}\n\n// Presentation module\nval presentationModule = module {\n viewModelOf(::ItemListViewModel)\n viewModelOf(::DashboardViewModel)\n}\n```\n\n### Hilt (Android-only)\n\n```kotlin\n@Module\n@InstallIn(SingletonComponent::class)\nabstract class RepositoryModule {\n @Binds\n abstract fun bindItemRepository(impl: ItemRepositoryImpl): ItemRepository\n}\n\n@HiltViewModel\nclass ItemListViewModel @Inject constructor(\n private val getItems: GetItemsByCategoryUseCase\n) : ViewModel()\n```\n\n## Error Handling\n\n### Result/Try Pattern\n\nUse `Result` or a custom sealed type for error propagation:\n\n```kotlin\nsealed interface Try {\n data class Success(val value: T) : Try\n data class Failure(val error: AppError) : Try\n}\n\nsealed interface AppError {\n data class Network(val message: String) : AppError\n data class Database(val message: String) : AppError\n data object Unauthorized : AppError\n}\n\n// In ViewModel — map to UI state\nviewModelScope.launch {\n when (val result = getItems(category)) {\n is Try.Success -> _state.update { it.copy(items = result.value, isLoading = false) }\n is Try.Failure -> _state.update { it.copy(error = result.error.toMessage(), isLoading = false) }\n }\n}\n```\n\n## Convention Plugins (Gradle)\n\nFor KMP projects, use convention plugins to reduce build file duplication:\n\n```kotlin\n// build-logic/src/main/kotlin/kmp-library.gradle.kts\nplugins {\n id(\"org.jetbrains.kotlin.multiplatform\")\n}\n\nkotlin {\n androidTarget()\n iosX64(); iosArm64(); iosSimulatorArm64()\n sourceSets {\n commonMain.dependencies { /* shared deps */ }\n commonTest.dependencies { implementation(kotlin(\"test\")) }\n }\n}\n```\n\nApply in modules:\n\n```kotlin\n// domain/build.gradle.kts\nplugins { id(\"kmp-library\") }\n```\n\n## Anti-Patterns to Avoid\n\n- Importing Android framework classes in `domain` — keep it pure Kotlin\n- Exposing database entities or DTOs to the UI layer — always map to domain models\n- Putting business logic in ViewModels — extract to UseCases\n- Using `GlobalScope` or unstructured coroutines — use `viewModelScope` or structured concurrency\n- Fat repository implementations — split into focused DataSources\n- Circular module dependencies — if A depends on B, B must not depend on A\n\n## References\n\nSee skill: `compose-multiplatform-patterns` for UI patterns.\nSee skill: `kotlin-coroutines-flows` for async patterns.\n\n## 原文\n- [英語版の原文](../../../../skills/android-clean-architecture/SKILL.md)\n\n## ナビゲーション\n- [日本語ドキュメント一覧](../../README.md)\n- [skills/README.md](../README.md)\n- [貢献ガイド](../../../../CONTRIBUTING.md)\n","tagline":"Clean Architecture patterns for Android and Kotlin Multiplatform projects — module structure, dependency rules, UseCases, 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