class ContactActivity : AppCompatActivity() {

    private val contactId by lazy {
        intent.extras["contact-id"]
    }

    private val view by lazy {
      ContactViewImpl(context = this)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(view)

      // handle redraw when view model updates, for example
      DI.contactViewModel.onUpdate = { viewState ->
        redraw(contactViewState = viewState)(view)
      }

      // bind views
      bind(DI.loadContactInteractor(contactId))(view)
      bind(DI.favContactInteractor(contactId))(view)
    }
}