FooPresenter.kt

/**
* Implementation Detail
*/ 
interface FooPresenterContract {
    interface Presenter {
        fun doWork()
    }
    
    interface View {
        fun inflated(message: String)
    }
}


class FooView : FooPresenterContract.View {
    
    private val presenter: FooPresenterContract.Presenter = FooPresenter(this)
    
    @override
    fun onViewAttached() {
        presenter.doWork()
    }
    
}

class FooPresenter(
   private val view: FooPresenterContract.View
): FooPresenterContract.Presenter {
   
   override fun doWork() {
       // simulate computation
       Thread.sleep(1000)
       
       view.inflated("it was success!")
   }
}