👀 Views: 1 💬 Answers: 1 📅 Created: 2025-06-08

android livedata viewmodel fragment kotlin

I'm experimenting with I've searched everywhere and can't find a clear answer. I've been working on this all day and I'm relatively new to this, so bear with me..... I'm facing a problem where my `LiveData` in the `ViewModel` is not updating the UI in the `Fragment` after the `ViewModel` is initialized. I have a simple setup where I fetch data from a remote API and observe it in the `Fragment`. The data is correctly fetched and updated in the `ViewModel`, but the `Fragment` does not reflect the changes unless I navigate away and back. Here’s a snippet of my code: ```kotlin class MyViewModel : ViewModel() { private val _data = MutableLiveData<String>() val data: LiveData<String> get() = _data fun fetchData() { // Simulating network call _data.postValue("Fetched Data") } } 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?) { viewModel.data.observe(viewLifecycleOwner, Observer { newData -> // Updating UI textView.text = newData }) viewModel.fetchData() // This is where I expect the UI to update } } ``` Despite calling `fetchData()` correctly, the `TextView` in my `Fragment` does not update with "Fetched Data". I have verified that the `LiveData` is indeed being updated by logging its value inside the `Observer`. The issue seems to stem from the fact that the `Fragment` does not trigger the `Observer` correctly on the first call. I’ve tried placing the `fetchData()` call in various lifecycle methods (e.g., `onStart()` and `onResume()`) but the issue persists. I also checked the dependencies and ensured that I’m using the correct version of `AndroidX` libraries. Any advice on why the `LiveData` does not immediately update the UI in this scenario would be greatly appreciated! I'm working on a application that needs to handle this. Am I missing something obvious? This is for a service running on CentOS. Is this even possible? My development environment is Debian. Is this even possible?