Kotlin Coroutines: How to Handle Cancellation in Nested Coroutine Scopes
I'm getting frustrated with I'm stuck on something that should probably be simple. I'm prototyping a solution and Does anyone know how to I can't seem to get I'm working on a personal project and I'm working on an Android app using Kotlin Coroutines to handle asynchronous tasks..... I've come across an issue where I have a nested coroutine scope inside a `ViewModel`, and when I cancel the parent coroutine, the child coroutines don't seem to be cancelling as expected. Here’s a simplified version of my code: ```kotlin class MyViewModel : ViewModel() { private val parentJob = Job() private val coroutineScope = CoroutineScope(Dispatchers.Main + parentJob) fun startTask() { coroutineScope.launch { val result = withContext(Dispatchers.IO) { // Simulate a long-running task delay(5000) "Task Result" } // Update LiveData with result myLiveData.postValue(result) } } override fun onCleared() { super.onCleared() parentJob.cancel() // Cancelling parent job } } ``` Here, I expect the coroutine launched in `startTask()` to be cancelled when `onCleared()` is called. However, I noticed that the `delay()` function still completes and the result is posted to `LiveData`. I’ve also tried using `coroutineScope.cancel()` in the `onCleared()` method instead, but the behavior remains the same. Is there a specific way to ensure that all child coroutines are cancelled when the parent coroutine is cancelled? I’ve also explored using `SupervisorJob`, but it doesn’t seem to change the cancellation behavior. Any insights on best practices for managing nested coroutine scopes would be greatly appreciated! My development environment is macOS. Is there a better approach? Any help would be greatly appreciated! This is part of a larger REST API I'm building. I'd really appreciate any guidance on this. This is happening in both development and production on Linux. I'd really appreciate any guidance on this. I'm coming from a different tech stack and learning Kotlin. What's the correct way to implement this? I'm using Kotlin 3.10 in this project.