Hilt Multi-module Cannot create an instance of class ViewModel

Question

I'm trying out a new architecture with multi-module and DI though Hilt, I have the following modules:

When I start the app I'm getting java.lang.RuntimeException: Cannot create an instance of class HomeViewModel

App module

@AndroidEntryPoint
class MainActivity: AppCompatActivity()

FeatureHome

class HomeFragment: Fragment() {
    private val viewModel: HomeViewModel by viewModels()
    ...
}

@HiltViewModel
class HomeViewModel @Inject constructor(): ViewModel {
    ....
}

I'm not sure what to do to resolve this. Should my HomeFragment also have @AndroidEntryPoint ?

[An activity or a fragment that is annotated with @AndroidEntryPoint can get the ViewModel instance as normal using ViewModelProvider or the by viewModels() KTX extensions:](https://developer.android.com/training/dependency-injection/hilt-jetpack#viewmodels) — bylazy, Apr 30 '23 at 06:45
Yes it works when the `HomeFragment` and `HomeViewModel` are in the same module as the `MainActivity` but when I move them to my `featureHome` module this doesn't work anymore — Biscuit, Apr 30 '23 at 06:50
HomeFragment must also have @AndroidEntryPoint as the other comment suggests. And make sure hilt is in both modules. — jeprubio, Apr 30 '23 at 08:07
But why ? When both Fragment and Activity are in the same package you don't need to have @AndroidEntryPoint on the Fragment — Biscuit, Apr 30 '23 at 08:43
You are injecting the ViewModel in your fragment with `by viewModels()`. This requires the annotation to work. — Atick Faisal, Apr 30 '23 at 10:03
Does this answer your question? [Cannot create an instance of class ViewModel](https://stackoverflow.com/questions/44998051/cannot-create-an-instance-of-class-viewmodel) — Victor Sklyarov, Apr 30 '23 at 10:21
@AtickFaisal that's what I'm saying when HomeFragment is in the same module as MainActivity it is not needed, why the difference? — Biscuit, Apr 30 '23 at 17:38

score 0 · Answer 1 · answered Apr 30 '23 at 10:10

0

Your Fragment has to be marked with the annotation @AndroidEntryPoint in order to tell Hilt to inject instances in your Fragment. (documentation)

answered Apr 30 '23 at 10:10

Mikhail Guliaev

1 Answers1