implementing LiveData implementation guide UI in nested ViewModels on Android using Hilt
I tried several approaches but none seem to work. Does anyone know how to I'm sure I'm missing something obvious here, but I'm working with an scenario where my `LiveData` in a nested `ViewModel` is not updating the UI as expected when using Hilt for dependency injection. I have a parent fragment that initializes a `ViewModel`, which in turn has a child `ViewModel` injected. The question occurs when I update the `LiveData` in the child `ViewModel`, but the UI in the parent fragment does not reflect these changes. Here’s a simplified version of what I have: In my `ParentFragment`: ```kotlin class ParentFragment : Fragment() { @Inject lateinit var parentViewModel: ParentViewModel override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { // Hilt injection (requireActivity().application as MyApplication).appComponent.inject(this) return inflater.inflate(R.layout.fragment_parent, container, false) } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { parentViewModel.childViewModel.liveData.observe(viewLifecycleOwner) { data -> // Update UI with data textView.text = data } } } ``` In my `ParentViewModel`: ```kotlin @HiltViewModel class ParentViewModel @Inject constructor( val childViewModel: ChildViewModel ) : ViewModel() { // Additional logic here } ``` And in my `ChildViewModel`: ```kotlin @HiltViewModel class ChildViewModel @Inject constructor() : ViewModel() { private val _liveData = MutableLiveData<String>() val liveData: LiveData<String> get() = _liveData fun updateData(newData: String) { _liveData.value = newData } } ``` I attempted to debug this by checking if `updateData` is called and confirming that the `LiveData` is indeed being updated. However, the observer in `ParentFragment` is never triggered. I also made sure that the `viewLifecycleOwner` is correctly set. I'm using Android API level 30 and following the latest best practices with Hilt. Any ideas on what might be going wrong or how to fix this scenario? My development environment is Linux. What am I doing wrong? Any ideas how to fix this? This is happening in both development and production on Ubuntu 20.04.