How do I correctly create a ViewModel in a `Compon...
# androidl
Lukasz Kalnik
11/27/2023, 3:14 PMHow do I correctly create a ViewModel in a
ComponentDialogDialogFragmentby viewModels()m
marlonlom
11/27/2023, 3:23 PMyou mean bind the viewmodel?
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Lukasz Kalnik
11/27/2023, 3:23 PMYes
Lukasz Kalnik
11/27/2023, 3:23 PMCreate a reference to it inside the ComponentDialog
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marlonlom
11/27/2023, 3:23 PMCheck this from stackoverflow :
https://stackoverflow.com/questions/59212981/viewmodel-in-dialogfragment
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Lukasz Kalnik
11/27/2023, 3:25 PMYes, but
ComponentDialogDialogFragmentLukasz Kalnik
11/27/2023, 3:28 PMI suppose it's not possible for a
ComponentDialogViewModelComponentDialogViewModelStoreOwnerm
marlonlom
11/27/2023, 3:28 PMmmm, i think you can provide an extension or a delegate function for getting the viewmodel
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Lukasz Kalnik
11/27/2023, 3:29 PMHow?
Lukasz Kalnik
11/27/2023, 3:29 PMThis is possible only in `Fragment`s and `Activity`s
Lukasz Kalnik
11/27/2023, 3:29 PMNot in a
Dialogm
marlonlom
11/27/2023, 3:31 PMDid you have this line when creating the viewmodel instance in DialogFragment?
private val viewModel by viewModels<SomeViewModel>(ownerProducer = { this.requireParentFragment() })
marlonlom
11/27/2023, 3:31 PMthe previous comment is based on this link: https://www.linkedin.com/pulse/share-fragment-scoped-view-model-child-fragments-albert/
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Lukasz Kalnik
11/27/2023, 3:32 PMI don't use a
DialogFragmentLukasz Kalnik
11/27/2023, 3:32 PMI use a
ComponentDialogDialogFragmentFragmentLukasz Kalnik
11/27/2023, 3:33 PMIt has no
viewModels()m
marlonlom
11/27/2023, 3:42 PMah, what dependencies related to the viewmodel aspect do you have in app's build.gradle?
marlonlom
11/27/2023, 3:43 PMcheck if you can add this library:
implementation "androidx.lifecyclelifecycle viewmodel ktx2.2.0-rc03"
kapt "androidx.lifecyclelifecycle compiler2.2.0-rc03"
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Lukasz Kalnik
11/27/2023, 3:46 PMI have these dependencies in project. It seems not possible. Thank you for your efforts.
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marlonlom
11/27/2023, 3:48 PMAre you using the mentioned delegates in another fragments/activities?
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Lukasz Kalnik
11/27/2023, 3:50 PMYes, and they work
Lukasz Kalnik
11/27/2023, 3:50 PMThe problem is,
ComponentDialogFragmentLukasz Kalnik
11/27/2023, 3:50 PMIt cannot have a ViewModel of its own
Lukasz Kalnik
11/27/2023, 3:50 PMThank you for your help.
m
marlonlom
11/27/2023, 3:52 PMyes, i know, but, there is some ways to use the lifecycle attributes inside the component dialog.
this link explin a more bit about this: https://proandroiddev.com/dialogs-in-android-mvvm-5d6e1ca53b19
the idea is using the lifecycle observers to delegate the creation and the binding of the viewmodel
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Lukasz Kalnik
11/27/2023, 3:53 PMThe article only mentions `DialogFragment`s everywhere, not `Dialog`s.
Lukasz Kalnik
11/27/2023, 3:55 PMIt also mentions a custom View as Dialog, but there the ViewModel is inside the Activity, which shows the dialog.
Lukasz Kalnik
11/27/2023, 3:56 PMIt also uses DataBinding.
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marlonlom
11/27/2023, 4:03 PMwait, dialog?
mm, where is the dialog opening/showing? in a fragment? activity?
afaik, the dialog contains callbacks for the dialog closing or the button (ok, cancel) click events, have you tried using a callback that includes the negative/positive actions and pass them in the dialog invokation?
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Ian Lake
11/27/2023, 4:05 PMYou need a ViewModelStoreOwner to store ViewModels, yes. A Dialog (and ComponentDialog) are at the same level as View - you'd need to go up one more layer to DialogFragment and Fragment if you want a ViewModelStoreOwner
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