skills/ HoangNguyen0403/agent-skills-standard

android-di

Configure Hilt dependency injection with proper scoping, modules, and constructor injection in Android. Use when changing the production Hilt graph; defer test overrides, Room wiring, navigation-specific scopes, and generic DI explanations to their specific skills.

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Android Dependency Injection (Hilt)

Priority: P0 (CRITICAL)

1. Bootstrap Hilt

  • Annotate Application class with @HiltAndroidApp.
  • Annotate Activities/Fragments with @AndroidEntryPoint.

See module templates for bootstrap and module examples.

2. Define Modules

  • Use @Binds (abstract class) over @Provides when possible — generates smaller code.
  • explicit with @InstallIn (SingletonComponent, ViewModelComponent).

See module templates for @Binds examples.

3. Prefer Constructor Injection

  • Use @Inject constructor(...) over field injection.
  • Use @AssistedInject for runtime parameters.

Anti-Patterns

  • No Manual Dagger Components: Use Hilt — it generates all wiring.
  • No Field Injection in Logic: Use constructor injection; field injection only in Android framework classes.

References

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