InvasiveSpeciesMapFragment.kt

class InvasiveSpeciesMapFragment: Fragment() {

   private val navController by lazy {
       Navigation.findNavController(requireActivity(), R.id.fragment_container)
   }

  private val viewModel by viewModels<InvasiveSpeciesMapViewModel> {
       InvasiveSpeciesMapViewModelFactory(navigator = Navigator(navController, resources))
   }

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

       viewModel.viewState.observeForever { viewState ->
           viewState?.let { render(it) }
       }
   }

   override fun onCreateView(
       inflater: LayoutInflater, 
        container: ViewGroup?, 
        savedInstanceState: Bundle?): View? = inflater.inflate(R.layout.fragment_invasive_species_map, container, false)

   private fun render(viewState: InvasiveSpeciesMapViewState) {
       when (viewState) {
           is InvasiveSpeciesMapViewState.Loading -> {
               invasive_species_map_loader.visibility = View.VISIBLE
               invasive_species_map_text.visibility = View.GONE
           }
           is InvasiveSpeciesMapViewState.Content -> {
               invasive_species_map_loader.visibility = View.GONE
               invasive_species_map_text.visibility = View.VISIBLE
           }
       }
   }
}