无法使用构造函数创建类 ViewModel 的实例

Question

I'm trying to use the viewmodel in my activity but my app crashes the error "Cannot create an instance of class" from the viewmodel. The ViewModel is like this:

class MyViewModel@Inject constructor(val application: Application) : ViewModel() {
   //...
}

In my activity, I have this:

class Activity: BaseActivity(){
       val viewModel: MyViewModel by viewModels()

       override fun onCreate(savedInstanceState: Bundle?) {
                 super.onCreate(savedInstanceState)
       }
}

If I delete the constructor, my app works but I need to get packageName, so I need context or application.

Why I'm getting this error? Any idea?

Answer 1

您可以使用 AndroidViewModel

class MyViewModel@Inject constructor(val application: Application) : AndroidViewModel(application)

Answer 2

If you using Dagger-hilt may b you can't add @HiltViewModel. also check in your activity whether this tag (@AndroidEntryPoint) is added or not.