How to implement guide with fragment lifecycle and viewmodel state restoration in android 14 using jetpack
I'm trying to configure I've encountered a strange issue with I'm working on a project and hit a roadblock. I'm working with a question with restoring my ViewModel state when navigating back to a fragment in Android 14. I'm using Jetpack Navigation and a ViewModel to hold data for the fragment. The scenario arises when I navigate away from the fragment and return; the data in the ViewModel isn't being restored as expected, leading to a NullPointerException when I try to access it. Here’s a simplified version of my fragment code: ```kotlin class MyFragment : Fragment() { private val viewModel: MyViewModel by viewModels() override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { return inflater.inflate(R.layout.fragment_my, container, false) } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.someLiveData.observe(viewLifecycleOwner) { data -> // Attempting to update UI textView.text = data } } } ``` I’m initializing the ViewModel using the `by viewModels()` delegate, which should tie its lifecycle to the Fragment. However, when I navigate away and back, the `someLiveData` is null. I checked to ensure that I'm not accidentally clearing the ViewModel or losing its state on configuration changes. I also verified that I am not recreating the fragment unnecessarily in the navigation graph. Here’s the relevant part of my navigation graph definition: ```xml <fragment android:id="@+id/myFragment" android:name="com.example.MyFragment" tools:layout="@layout/fragment_my"> </fragment> ``` I would appreciate any insights on why the ViewModel state is lost during navigation or if there's a particular configuration I missed. Is there a best practice for handling ViewModel data when using Jetpack Navigation in Android 14? My development environment is macOS. Is there a better approach? Any help would be greatly appreciated! Thanks in advance!