Unexpected Behavior When Implementing Paging 3 with StateFlow in Android 14
I've searched everywhere and can't find a clear answer... I'm currently implementing the Paging 3 library in my Android application with Kotlin and I've run into an issue where my paginated list does not update when I toggle filters using a StateFlow. After I change the filter criteria, I expect the list to update with the new data, but it remains unchanged until I manually refresh the UI. Here's a simplified version of my ViewModel code: ```kotlin class MyViewModel(private val repository: MyRepository) : ViewModel() { private val _filter = MutableStateFlow("") val filter: StateFlow<String> = _filter.asStateFlow() val pagedItems = filter.flatMapLatest { currentFilter -> repository.getPaginatedItems(currentFilter) }.cachedIn(viewModelScope) fun setFilter(newFilter: String) { _filter.value = newFilter } } ``` In my Repository, I have the following code that fetches paginated items depending on the filter: ```kotlin class MyRepository(private val apiService: ApiService) { fun getPaginatedItems(filter: String): Flow<PagingData<Item>> { return Pager( config = PagingConfig(pageSize = 20), pagingSourceFactory = { MyPagingSource(apiService, filter) } ).flow } } ``` And here's my PagingSource: ```kotlin class MyPagingSource(private val apiService: ApiService, private val filter: String) : PagingSource<Int, Item>() { override suspend fun load(params: LoadParams<Int>): LoadResult<Int, Item> { // Fetch data from API } } ``` I expected that every time I call `setFilter()` in my ViewModel, it would trigger a new load in the PagingSource and update the UI accordingly. Instead, it only updates when I rotate the device or perform some other configuration change. I also tried using `collectLatest` in my Fragment to observe the `pagedItems`, but I'm still not seeing the expected behavior. ```kotlin viewModel.pagedItems.collectLatest { pagingData -> adapter.submitData(lifecycle, pagingData) } ``` I've also ensured that I'm correctly collecting the flow in a lifecycle-aware way. Am I missing something in the way I'm using StateFlow with Paging 3? Any insights on how to make the UI reactive to the filter changes would be greatly appreciated. Has anyone else encountered this? This is part of a larger application I'm building. Am I missing something obvious?