Level 10

Dependency Injection (Hilt)

Hilt for DI

Automating how classes get their dependencies.

📚 Explanation

Hilt (built on Dagger) automates dependency injection. `@Module` defines how to create dependencies. `@InstallIn` specifies the component scope. `@HiltAndroidApp` initializes Hilt in the Application class. `@AndroidEntryPoint` enables field injection in Activities/Fragments.

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kotlin

@Module
@InstallIn(SingletonComponent::class) // Available throughout the app
object NetworkModule {

    @Provides
    @Singleton
    fun provideRetrofit(): Retrofit {
        return Retrofit.Builder()
            .baseUrl("https://api.example.com/")
            .build()
    }

    @Provides
    fun provideUserService(retrofit: Retrofit): UserService {
        return retrofit.create(UserService::class.java)
    }
}

// Application setup
@HiltAndroidApp
class MyApp : Application()

// Activity Setup
@AndroidEntryPoint
class MainActivity : ComponentActivity() { ... }

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