// Given some classes 
class MyRepository()
// Inject via constructor
class MyPresenter(val repository : MyRepository) 
 
// just declare it 
val myModule = module { 
  singleOf(::MyPresenter)
  singleOf(::MyRepository)
}

fun main() { 
  
  // Just start Koin
  startKoin {
    // load modules
    modules(myModule)
  }
} 

class MyApplication : Application() {
  override fun onCreate() {
    super.onCreate()
    // start Koin!
    startKoin {
      // declare used Android context
      androidContext(this)
      // declare modules
      modules(myModule)
    }
  } 
} 

class MyActivity : Application() {
  // Just inject your dependency
  val myPresenter : MyPresenter by inject()
}