👀 Views: 74 💬 Answers: 1 📅 Created: 2025-06-06

android retrofit coroutines viewmodel kotlin

Hey everyone, I'm running into an issue that's driving me crazy. I'm working with an intermittent crash in my Android application when making network calls using Retrofit with coroutines. I have set up Retrofit with a simple API interface like this: ```kotlin interface ApiService { @GET("users") suspend fun getUsers(): List<User> } ``` In my ViewModel, I launch a coroutine to fetch the users: ```kotlin class UserViewModel(private val apiService: ApiService) : ViewModel() { private val _users = MutableLiveData<List<User>>() val users: LiveData<List<User>> get() = _users fun fetchUsers() { viewModelScope.launch { try { val usersList = apiService.getUsers() _users.postValue(usersList) } catch (e: Exception) { Log.e("UserViewModel", "behavior fetching users", e) } } } } ``` This works fine most of the time, but I occasionally see a `CancellationException` in my logs when I navigate away from the screen while the data is being fetched. The behavior log shows: ``` java.util.concurrent.CancellationException at kotlinx.coroutines.JobSupport.getCancellationException(JobSupport.kt:1134) at kotlinx.coroutines.JobSupport.joinInternal(JobSupport.kt:960) at kotlinx.coroutines.AbstractCoroutine.join(AbstractCoroutine.kt:117) ``` I have attempted to handle the cancellation by wrapping my network call in a `try-catch` block, but the crash still occurs when the coroutine is canceled. I tried to use `withContext(Dispatchers.Main)` before posting the result, but it doesn't seem to help. Is there a better way to manage coroutine cancellation in this context? What best practices should I follow to avoid such issues? Any advice would be greatly appreciated! I'm working on a API that needs to handle this.