👀 Views: 642 💬 Answers: 1 📅 Created: 2025-08-26

android hilt livedata kotlin

I'm attempting to set up I need help solving I'm sure I'm missing something obvious here, but I'm working with a `ClassCastException` when trying to observe a LiveData object from my ViewModel in a Fragment that's using Hilt for dependency injection. The behavior occurs on the line where I attempt to set up the observer in my Fragment: ```kotlin viewModel.myData.observe(viewLifecycleOwner) { data -> // Update UI with data } ``` The ViewModel is defined like this: ```kotlin @HiltViewModel class MyViewModel @Inject constructor(private val repository: MyRepository) : ViewModel() { val myData: LiveData<List<MyData>> = repository.getData() } ``` In my Fragment, I'm injecting the ViewModel using: ```kotlin @AndroidEntryPoint class MyFragment : Fragment() { private val viewModel: MyViewModel by viewModels() } ``` The repository method looks like: ```kotlin class MyRepository @Inject constructor() { fun getData(): LiveData<List<MyData>> { // Simulate database fetching return MutableLiveData<List<MyData>>() } } ``` The `ClassCastException` stack trace indicates that it is trying to cast `MutableLiveData` to `LiveData`, which should normally be fine because `MutableLiveData` is a subclass of `LiveData`. I've verified that `MyData` is a proper data class and that all necessary Hilt annotations are in place. I've tried cleaning my project and invalidating caches, but the scenario continues. Is there something I'm missing in the way Hilt handles ViewModels or LiveData? I've ensured that my dependencies in build.gradle are up to date, including Hilt and lifecycle components. Here are the relevant dependencies I’m using: ```groovy implementation "com.google.dagger:hilt-android:2.42" annotationProcessor "com.google.dagger:hilt-android-processor:2.42" implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.5.1" implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1" ``` Has anyone faced a similar scenario, or can anyone point out what might be going wrong? My development environment is Windows. I'd really appreciate any guidance on this. My team is using Kotlin for this service. Any ideas how to fix this? I recently upgraded to Kotlin 3.11. I'd be grateful for any help.