# Android Dependency Injection (Hilt)

> Standards for Hilt Setup, Scoping, and Modules

- Skill: `majiayu000/android-dependency-injection-hilt` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/android-dependency-injection-hilt`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/android-dependency-injection-hilt/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/android-dependency-injection-hilt

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# Android Dependency Injection (Hilt)

## **Priority: P0**

## Implementation Guidelines

### Setup

- **App**: Must annotate `Application` class with `@HiltAndroidApp`.
- **Entries**: Annotate Activities/Fragments with `@AndroidEntryPoint`.

### Modules

- **Binding**: Use `@Binds` (abstract class) over `@Provides` when possible (smaller generated code).
- **InstallIn**: Be explicit (`SingletonComponent`, `ViewModelComponent`).

### Construction

- **Constructor Injection**: Prefer over Field Injection (`@Inject constructor(...)`).
- **Assisted Injection**: Use for runtime parameters (`@AssistedInject`).

## Anti-Patterns

- **Component Manual Creation**: `**No Manual Dagger**: Use Hilt Standard.`
- **Field Inject in Logic**: `**No Field Inject**: Only in Android Components.`

## References

- [Module Templates](references/files.md)