MainLayout.kt

class MainLayout : ViewBinder<MainActivity> {

  override fun bind(mainActivity: MainActivity): View =
    mainActivity.UI {
      coordinatorLayout {
        fitsSystemWindows = true

        appBarLayout {
          mainActivity.toolBar = toolbar {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) elevation = 4f
          }.lparams(width = matchParent, height = actionBarSize())
      
        }.lparams(width = matchParent)

        mainActivity.container = frameLayout()
          .lparams(width = matchParent, height = matchParent) {
            behavior = AppBarLayout.ScrollingViewBehavior()
          }
      }
    }.view

  override fun unbind(mainActivity: MainActivity) {
    mainActivity.container = null
    mainActivity.recycView = null
  }
}