👀 Views: 0 💬 Answers: 1 📅 Created: 2025-07-08

android viewmodel livedata fragment Kotlin

I'm prototyping a solution and Does anyone know how to I'm working on a personal project and I've been banging my head against this for hours. I'm experiencing unexpected behavior when trying to update my UI based on LiveData within a Fragment's lifecycle. I'm using Android's ViewModel and LiveData components, with the following relevant setup: I have a ViewModel where I fetch data from a repository, and I expose a LiveData object. In my Fragment, I'm observing that LiveData object. However, I'm seeing inconsistent updates, particularly when the Fragment is resumed after being paused. Here's a simplified version of the code: ```kotlin class MyViewModel : ViewModel() { private val _data = MutableLiveData<List<String>>() val data: LiveData<List<String>> get() = _data fun fetchData() { // Simulating a network call _data.postValue(listOf("Item 1", "Item 2", "Item 3")) } } class MyFragment : Fragment() { private lateinit var viewModel: MyViewModel override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { viewModel = ViewModelProvider(this).get(MyViewModel::class.java) return inflater.inflate(R.layout.fragment_my, container, false) } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) viewModel.data.observe(viewLifecycleOwner, Observer { dataList -> // Assuming there's a RecyclerView that needs to be updated recyclerView.adapter = MyAdapter(dataList) }) } override fun onResume() { super.onResume() viewModel.fetchData() // Fetching data again on resume } } ``` The main issue arises when I navigate away from the Fragment and come back; the RecyclerView does not update as expected. I can see the `fetchData()` method is called, but the observer does not trigger an update to the adapter. I checked that the LiveData isn't null, and I even tried using `viewLifecycleOwner` to ensure that the observer is tied to the Fragment's lifecycle. I've also verified that the adapter is correctly set and should reflect the new data. It's frustrating because it seems like the observer isn't firing for some reason when the Fragment resumes. Any insights on why the updates might not be occurring would be greatly appreciated! I'm using AndroidX libraries, specifically `androidx.lifecycle:lifecycle-extensions:2.2.0` and `androidx.fragment:fragment-ktx:1.3.6`. Thanks for your help in advance! I'm using Kotlin LTS in this project. I'd be grateful for any help.