fragment.kt

override fun onViewCreated(view: View, savedInstanceState: Bundle ?) {
    super.onViewCreated(view, savedInstanceState)
    recyclerview.adapter = MyAdapter()
    activityViewModel.listStateParcel?.let {parcelable - >
      recyclerview.layoutManager?.onRestoreInstanceState(parcelable)
      activityViewModel.listStateParcel = null  
    }
}

override fun onDestroyView() {
    val listState = planet_list?.layoutManager?.onSaveInstanceState()
    listState?.let { activityViewModel.saveListState(it) }
    super.onDestroyView()
}