Configure Hilt dependency injection with proper scoping, modules, and constructor injection in Android. Use when setting up Hilt DI, defining modules, or configuring component scoping.
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---
name: android-di
description: Configure Hilt dependency injection with proper scoping, modules, and constructor injection in Android. Use when setting up Hilt DI, defining modules, or configuring component scoping.
metadata:
triggers:
files:
- '**/*Module.kt'
- '**/*Component.kt'
keywords:
- "@HiltAndroidApp"
- "@Inject"
- "@Provides"
- "@Binds"
---
# Android Dependency Injection (Hilt)
## **Priority: P0**
## 1. Bootstrap Hilt
- Annotate `Application` class with `@HiltAndroidApp`.
- Annotate Activities/Fragments with `@AndroidEntryPoint`.
See [module templates](references/files.md) 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](references/files.md) 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](references/files.md)
