MainActivityViewModel.kt

sealed class MainActivityViewState {
   object Loading : MainActivityViewState()
   object Content : MainActivityViewState()
}

class MainActivityViewModel: ViewModel() {

  private val _viewState = MutableLiveData<MainActivityViewState>()
   val viewState: LiveData<MainActivityViewState> = _viewState

   init {
       _viewState.value = MainActivityViewState.Loading
       loadContent()
   }

   private fun loadContent() {
       navigator.navigateToInvasiveSpeciesMap()
   }
}