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val toastPub:PublishSubject<ToastData> = PublishSubject.create()

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viewModel.toastPub.subscribe { toastData ->
    when(toastData) {
        is ShortToast -> Toast.makeText(this, toastData.msgId, Toast.LENGTH_SHORT).show()
        is LongToast -> Toast.makeText(this, toastData.msgId, Toast.LENGTH_LONG).show()
    }
}

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/**
 * Representation of [Toast] data that can be exposed by a view model, observed, and bound to
 * the current UI
 */
sealed class ToastData

data class ShortToast(@StringRes val msgId:Int) : ToastData()
data class LongToast(@StringRes val msgId:Int) : ToastData()

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typealias SnackFinishedListener = () -> Unit
typealias SnackActionListener = () -> Unit

/**
 * Representation of [Snackbar] data that can be exposed by a view model, observed, and bound to
 * the current UI
 */
sealed class SnackData

/**

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/**
 * Provides a [ViewDataBinding] object of the declared type by
 * calling [DataBindingUtil.setContentView] with the property owning [Activity] and the specified
 * layout resource id
 */
class ActivityBindingProvider<out T : ViewDataBinding>(
        @LayoutRes private val layoutRes: Int) : ReadOnlyProperty<Activity, T> {

    private var binding : T? = null

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@BindingAdapter("isHeaderVisible")
fun setHeaderVisibility(view: View, isVisible: Boolean) {
    if (view.visibility == View.VISIBLE) {
        if (isVisible) {
            return
        }

        view.animate()
                .alpha(0f)
                .translationY(-1f * view.height)

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@BindingAdapter("imageUrl")
fun setProgress(view: ImageView, url: String) {
    Glide.with(view.context)
            .load(url)
            .error(R.drawable.ic_broken_image_black)
            .listener(object : RequestListener<String, GlideDrawable> {
                override fun onException(e: Exception?, model: String?, target: Target<GlideDrawable>?, isFirstResource: Boolean): Boolean {
                    // use this to ensure placeholder icon doesn't stretch to fill too much space
                    view.scaleType = ImageView.ScaleType.CENTER_INSIDE
                    return false

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// I would typically place this adapter in main/_BindingAdapters.kt
// The gist tool won't allow that filename structure
//
@BindingAdapter("mainSubtitleText")
fun setText(view: TextView, value:Int) {
    view.text = view.context.getString(R.string.main_subtitle_format, value)
}

@BindingAdapter("textColor")
fun setTextColor(view: TextView, @ColorRes resId: Int) = view.setTextColor(ContextCompat.getColor(view.context, resId))

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class MainActivity : AppCompatActivity(), ViewModelListener {

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

        val binding = DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main).bindData {
            viewModel = MainViewModel("hello", 5, this@MainActivity)
        }
    }

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inline fun <T : ViewDataBinding> T.bindData(block: T.() -> Unit): T { block(); return this }