skills/ HoangNguyen0403/agent-skills-standard

android-architecture

Apply Clean Architecture layering, modularization, and Unidirectional Data Flow in Android projects. Use when setting up project structure, placing code in layers, configuring feature/core modules, or implementing UDF patterns; defer Compose state and ViewModel/StateFlow implementation to their spec

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Android Architecture Standards

Priority: P0 (CRITICAL)

1. Layer Your Project (Clean Architecture)

  • Domain: Pure Kotlin (No Android deps). Contains UseCases and Models.
  • Data: Repository impl, DataSources (API/DB). Maps DTO -> Domain.
  • UI: ViewModel + Composable. Maps Domain -> UiState.

See structure & examples for Clean Architecture layer examples.

2. Modularize by Feature and Core

  • Feature Modules: :feature:home, :feature:profile.
  • Core Modules: :core:ui (Design System), :core:network, :core:database.
  • App Module: DI Root and Navigation Guard.

See structure & examples for module configuration.

3. Enforce Unidirectional Data Flow (UDF)

  • Events: UI -> ViewModel (user actions flow UP).
  • State: ViewModel -> UI (StateFlow<UiState> flows DOWN).

4. Verify Jetpack Compose Integration

  • Hosting: Use setContent in Activity (No XML Layouts).
  • State: Hoist state to ViewModel using collectAsStateWithLifecycle.
  • Recomposition: Ensure Composable parameters @Stable or @Immutable.
  • Navigation: Use Compose Navigation with Type-Safe destinations.

Anti-Patterns

  • No Logic in Activity: Host Navigation only.
  • No Repo in UI: Access data exclusively via ViewModel.
  • No Context in Domain: Keep Logic Pure.

Verification

  • Domain layer has zero Android framework imports.
  • Each feature module compiles independently.
  • State flows one-way: Events UP, State DOWN.
  • ./gradlew build succeeds.

References

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