android-di

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

• Module Templates