What tools or libraries for Dependency Injection have you used in your projects?

In Android projects, the following dependency injection libraries are commonly used:

• Dagger 2 — a static, compile-time DI framework from Google that generates code during compilation, ensuring high performance.
• Hilt — a wrapper over Dagger 2 that simplifies its usage and integration with Android components.
• Koin — a lightweight Kotlin DI framework that does not require code generation and is easier to set up, suitable for small to medium projects.

Example of using Koin:

// Define a module
val appModule = module {
    single { Repository() }
    factory { ViewModel(get()) }
}

// Initialize Koin in Application
class App : Application() {
    override fun onCreate() {
        super.onCreate()
        startKoin {
            androidContext(this@App)
            modules(appModule)
        }
    }
}

// Inject into Activity
class MainActivity : AppCompatActivity() {
    private val viewModel: ViewModel by inject()
}

The choice of tool depends on project requirements and team preferences.