In what cases is the Hilt library used for dependency injection in Android?

Hilt is used to simplify dependency injection in Android applications by automating the creation of Dagger components and their connections.

Main use cases:

• Large and medium projects: Simplifies managing a large number of dependencies.
• Active development: Accelerates adding new dependencies and refactoring.
• Using standard Android components: Hilt automatically provides dependencies for Application, Activity, Fragment, View, Service, BroadcastReceiver.
• Integration with Jetpack: Works well with ViewModel, WorkManager, and other Jetpack libraries.
• Improving testability: Simplifies replacing real dependencies with mocks or stubs in tests.

Example of using @AndroidEntryPoint for an activity:

// MainActivity.kt
@AndroidEntryPoint
class MainActivity : AppCompatActivity() {

    @Inject
    lateinit var myRepository: MyRepository

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Using the injected dependency
        myRepository.doSomething()
    }
}

Example of a module providing a dependency:

// AppModule.kt
@Module
@InstallIn(SingletonComponent::class)
object AppModule {

    @Provides
    @Singleton
    fun provideMyRepository(): MyRepository {
        return MyRepository()
    }
}

Thus, Hilt is beneficial when it is necessary to standardize and simplify the dependency injection process in typical Android applications, especially when using recommended architectural approaches.