Gist demonstrating how to get an ViewModel from your custom view

MyView.kt

class MyView(context: Context) : FrameLayout(context) {
    private val viewModel by lazy { setupViewModel() }
    private val activity by lazy { scanForActivity(context) }

    private fun scanForActivity(context: Context?): FragmentActivity = when (context) {
        is FragmentActivity -> context
        is ContextWrapper -> scanForActivity(context.baseContext)
        else -> throw IllegalArgumentException("Context must be a FragmentActivity!")
    }

    private fun setupViewModel() = createViewModel(id.toString()) {
        MyViewModel()
    }

    @Suppress("UNCHECKED_CAST")
    private inline fun <reified T : ViewModel> createViewModel(key: String, crossinline initializer: () -> T): T {
        val factory = object : ViewModelProvider.NewInstanceFactory() {
            override fun <T : ViewModel?> create(modelClass: Class<T>): T = initializer() as T
        }
        return ViewModelProviders.of(activity, factory).get(key, T::class.java)
    }

    class MyViewModel : ViewModel() {
        //TODO
    }
}