👀 Views: 0 💬 Answers: 1 📅 Created: 2025-06-15

kotlin android viewmodel stateflow Kotlin

I've searched everywhere and can't find a clear answer. I need help solving I'm converting an old project and I'm experiencing a question with StateFlow in my ViewModel where it fails to emit the latest value after configuration changes like screen rotations. I'm using Kotlin 1.6.10 with AndroidX ViewModel 2.4.0. My ViewModel has a StateFlow that should trigger UI updates, but it seems to reset its state during these lifecycle changes. Here's the relevant part of my ViewModel: ```kotlin class MyViewModel : ViewModel() { private val _stateFlow = MutableStateFlow(0) val stateFlow: StateFlow<Int> = _stateFlow fun increment() { _stateFlow.value++ } } ``` In my Fragment, I'm collecting the StateFlow like this: ```kotlin class MyFragment : Fragment() { private val viewModel: MyViewModel by viewModels() override fun onViewCreated(view: View, savedInstanceState: Bundle?) { lifecycleScope.launchWhenStarted { viewModel.stateFlow.collect { value -> // Update the UI textView.text = value.toString() } } } } ``` After a screen rotation, the textView shows `0` instead of the incremented value. I've tried retaining the ViewModel instance using `by viewModels()` and also checked that `increment()` is called before the rotation, but the StateFlow still resets. I also verified that the ViewModel is not being recreated by logging its lifecycle. What could be causing this scenario with StateFlow not emitting the latest value? Any insights would be appreciated. What am I doing wrong? My team is using Kotlin for this web app. Any ideas what could be causing this?