👀 Views: 0 💬 Answers: 1 📅 Created: 2025-07-03

android kotlin retrofit stateflow viewmodel Kotlin

I'm stuck on something that should probably be simple. I'm not sure how to approach I recently switched to Hey everyone, I'm running into an issue that's driving me crazy... I'm working on a project and hit a roadblock. Hey everyone, I'm running into an issue that's driving me crazy. I'm working with a question where my UI is not updating correctly when I fetch data from a REST API using Retrofit within a ViewModel. I'm using StateFlow to observe the data, but it seems that the UI doesn't reflect the changes after the data has been fetched. I'm running on Android 12 with Kotlin 1.6.10 and Retrofit 2.9.0. Here’s a snippet of my ViewModel: ```kotlin class MyViewModel : ViewModel() { private val _data = MutableStateFlow<List<MyData>>(emptyList()) val data: StateFlow<List<MyData>> = _data.asStateFlow() fun fetchData() { viewModelScope.launch { val response = myApiService.getData() // Assume this is a suspend function if (response.isSuccessful) { _data.value = response.body() ?: emptyList() } else { Log.e("MyViewModel", "behavior: ${response.errorBody()}") } } } } ``` In my fragment, I’m observing the data like this: ```kotlin class MyFragment : Fragment() { private val viewModel: MyViewModel by viewModels() override fun onViewCreated(view: View, savedInstanceState: Bundle?) { lifecycleScope.launchWhenStarted { viewModel.data.collect { newData -> // Update UI here updateUI(newData) } } } } ``` When `fetchData()` is called, I see logs showing that the data fetch was successful and the data is being set in the MutableStateFlow, but the `collect` block in my fragment is not triggered. I’ve confirmed that the API is returning data as expected, but I’m not sure what I’m missing. Could this be related to the scope or lifecycle of the coroutine? Or am I not correctly observing the StateFlow? What could be causing the UI not to update despite the state change? My development environment is Ubuntu. I'm working on a API that needs to handle this. Any ideas what could be causing this? Could someone point me to the right documentation? Thanks in advance! I'm coming from a different tech stack and learning Kotlin.