# 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.

- Skill: `hoangnguyen0403/android-di` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds add hoangnguyen0403/android-di`
- Raw SKILL.md: https://api.skillmd.com/api/skills/hoangnguyen0403/android-di/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: HoangNguyen0403 (https://skillmd.com/u/hoangnguyen0403)
- Updated: 2026-08-19
- Page: https://skillmd.com/skills/hoangnguyen0403/android-di

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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](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)