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Difficulty with LiveData implementation guide in Fragment when observing from ViewModel using DataBinding in Android 14

👀 Views: 39 đŸ’Ŧ Answers: 1 📅 Created: 2025-08-28
android livedata databinding viewmodel Kotlin

I'm trying to configure I'm maintaining legacy code that I'm deploying to production and After trying multiple solutions online, I still can't figure this out..... I'm working with an scenario where my LiveData in the ViewModel is not triggering UI updates in the Fragment when using DataBinding. I have a ViewModel that exposes a MutableLiveData property, but even after updating the value, the UI does not reflect these changes. Here's a snippet of what I have: ```kotlin class MyViewModel : ViewModel() { private val _data = MutableLiveData<String>() val data: LiveData<String> get() = _data fun updateData(newValue: String) { _data.value = newValue } } ``` And in my Fragment, I'm setting up the binding like this: ```kotlin class MyFragment : Fragment() { private lateinit var binding: FragmentMyBinding private lateinit var viewModel: MyViewModel override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { binding = DataBindingUtil.inflate(inflater, R.layout.fragment_my, container, false) viewModel = ViewModelProvider(this).get(MyViewModel::class.java) binding.lifecycleOwner = this binding.viewModel = viewModel return binding.root } } ``` I ensured that `lifecycleOwner` is set correctly, but the UI does not update when I call `viewModel.updateData("New Value")`. The observer seems not to be triggered because I'm not seeing any logs from `onChanged` method which I set up earlier. I also checked if the binding was correctly initialized and there are no exceptions in the logcat. I've tried adding an explicit observer in the Fragment: ```kotlin viewModel.data.observe(viewLifecycleOwner, { value -> Log.d("MyFragment", "Data changed: $value") }) ``` However, this also fails to log when I update the data. I suspect it might be related to the Data Binding setup or some lifecycle scenario, but I need to pinpoint the exact cause. Any suggestions on what might be going wrong or what I could check next? Any suggestions would be helpful.