Trouble with ViewModel State Restoration in Kotlin Multiplatform Mobile on App Restart
I'm sure I'm missing something obvious here, but I'm having a hard time understanding I'm prototyping a solution and After trying multiple solutions online, I still can't figure this out..... I'm working on a Kotlin Multiplatform Mobile (KMM) project where I'm using ViewModel to manage UI-related data in my iOS and Android apps. I've implemented state restoration to retain the ViewModel state when the app is restarted. However, I'm encountering an issue where the state isn't being restored correctly after the app is killed and relaunched on Android. I've set up my ViewModel as follows: ```kotlin class MyViewModel : ViewModel() { var someData: String? = null fun saveState() { someData = "Important Data" } } ``` In my Activity, I'm trying to restore the state in `onCreate`: ```kotlin override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) val viewModel: MyViewModel by viewModels() viewModel.saveState() // Save state when the Activity is created } ``` However, when I kill the app and restart it, `someData` is always null. I’ve also tried using `onSaveInstanceState` to save the state, but that doesn't seem to help either. Here’s the relevant part of my AndroidManifest: ```xml <activity android:name=".MainActivity" android:configChanges="orientation|screenSize" /> ``` I am not using any specific state restoration framework, just relying on ViewModel as per best practices. I would expect the data to persist, but it seems like the ViewModel instance is recreated from scratch, losing its state. I've looked into the lifecycle in Android and the way ViewModels are retained, but I'm not sure what I'm missing here. Any advice on how to properly manage state restoration with ViewModel in KMM, particularly when dealing with the app's lifecycle would be greatly appreciated. I'm using Android 14 and Kotlin 1.8. This is my first time working with Kotlin 3.10. What's the correct way to implement this? I recently upgraded to Kotlin stable. What would be the recommended way to handle this? For context: I'm using Kotlin on Ubuntu 20.04. Has anyone else encountered this?