What Problems Exist With Multi Activities blog post

FragmentInteraction.kt

class SharedUiData

class FragmentInteractionViewModel : ViewModel() {
  val interactionLiveData = MutableLiveData<SharedUiData>()
}

class FragmentA : Fragment() {
  fun publishNextUiDataToNextScreen(sharedUiData: SharedUiData) {
    val viewModel = ViewModelProviders.of(activity)
        .get(FragmentInteractionViewModel::class.java)
    viewModel.interactionLiveData.value = sharedUiData
  }
}

class FragmentB : Fragment() {
  override fun onViewCreated(
    view: View?,
    savedInstanceState: Bundle?
  ) {
    super.onViewCreated(view, savedInstanceState)
    val viewModel = ViewModelProviders.of(activity)
        .get(FragmentInteractionViewModel::class.java)
    viewModel.interactionLiveData.observe({lifecycle}) {
      // do something with SharedUiData
    }
  }
}