Nivel 10: inyección de dependencias (Hilt)

@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() { ... }