# Android Dependency Injection (Android)

> Dependency Injection with Hilt and Dagger: @Inject, @Module, @Provides, Scopes, Qualifiers, Testing

- 15 interview questions
- Mid-Level
- [Interview Questions: Android](https://sharpskill.dev/en/technologies/android/interview-questions.md)

## 1. What is Dependency Injection (DI)?

**Answer**

Dependency Injection is a pattern that provides a class's dependencies from the outside rather than creating them inside. This improves testability, modularity and reduces coupling between components.

## 2. What is Hilt?

**Answer**

Hilt is a DI library built on top of Dagger 2, specifically designed for Android. It simplifies DI configuration with standard annotations and automatically manages Android components (Activities, Fragments, ViewModels).

## 3. What is the @HiltAndroidApp annotation used for?

**Answer**

@HiltAndroidApp is applied on the Application class and triggers Hilt code generation. It creates the application root component and enables dependency injection throughout the app. Required to use Hilt.

## 12 more questions available

- What is the @AndroidEntryPoint annotation used for?
- What is the @Inject annotation used for?

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