LoginWithBindingPresenter.kt

class LoginWithBindingPresenter(var viewModel: LoginDataBindingViewModel?, 
                                var view: LoginWithBindingInf.ViewInf) 
                                : LoginWithBindingInf.PresenterInf {
    override fun onInit() {
        viewModel?.onClickLogin = View.OnClickListener { _ ->
            view.performLogin(viewModel?.email + " " + viewModel?.password)
            viewModel?.email = ""
            viewModel?.password = ""
        }
    }
}