how to Update LiveData from Worker in Android 14 Using Hilt - Getting Null Pointer handling
I'm integrating two systems and I've been struggling with this for a few days now and could really use some help. I'm working on a project and hit a roadblock... Quick question that's been bugging me - I'm working with an scenario where I want to update a `LiveData` object from a `Worker` in my Android app using Hilt for dependency injection... My `Worker` is supposed to fetch data from an API and then update the `LiveData`, but I'm getting a `NullPointerException` when I try to access the `LiveData` instance. Here’s the relevant part of my code: I have a `ViewModel` that contains a `MutableLiveData<List<Item>>` called `items`. ```kotlin class MyViewModel @Inject constructor() : ViewModel() { private val _items = MutableLiveData<List<Item>>() val items: LiveData<List<Item>> get() = _items fun updateItems(newItems: List<Item>) { _items.postValue(newItems) } } ``` In my `Worker`, I’m trying to get an instance of `MyViewModel` like this: ```kotlin class MyWorker(context: Context, params: WorkerParameters) : Worker(context, params) { @Inject lateinit var viewModel: MyViewModel init { HiltWorkerFactory.create(context).inject(this) } override fun doWork(): Result { // Simulate API call and get items val newItems = fetchItemsFromApi() viewModel.updateItems(newItems) // This line causes NullPointerException return Result.success() } } ``` I have ensured that my `Worker` is properly annotated with `@HiltWorker` and my Application class is set up for Hilt. Here’s how I’m initializing the worker in my activity: ```kotlin val workRequest = OneTimeWorkRequestBuilder<MyWorker>().build() WorkManager.getInstance(this).enqueue(workRequest) ``` The stack trace shows that `viewModel` is `null` when I call `viewModel.updateItems(newItems)`. I have tried using `@AssistedInject` and passing the `ViewModel` instance to the worker, but I still encounter issues. What am I doing wrong? How can I correctly access and update the `LiveData` from within the `Worker` without running into this `NullPointerException`? This is part of a larger service I'm building. I'm working on a web app that needs to handle this. Any suggestions would be helpful. This issue appeared after updating to Kotlin stable. What's the best practice here? I recently upgraded to Kotlin 3.9.