Android share ViewModel between fragment and dialog fragment?

Question

How to share same viewModel between dialog and dialogFragment? I know that viewModel can be shared in activity scope. But it is too big scope for me.

 private val model: SharedViewModel by activityViewModels()

Unfortunately I don't have in a project navigation component.

Antichrist

You can check out here developer.android.com/topic/libraries/architecture/… – Trigonal

Yeah I exactly used this source. This line in question is even from this page. The problem is that my fragment shows product details and I have multiple products and I need to clean my liveData manually. And I have only one activity, so I don't needed this viewModel all the time. Only when user enters the details page. – Antichrist

you show dialog and dialogFragment at the same time? – Eliath

Yes. I show fragment and over it I show dialog fragment. I run same request to update UI in fragment and dialogFragment. – Antichrist

and you want to share between fragment and dialogFragment right? – Eliath

Yes. Only between them. – Antichrist

Check my answer – Eliath

Let us continue this discussion in chat. – Antichrist

Answer 1

1. Use childFragmentManager to show DialogFragment

2. Declare shared ViewModel inside Fragment by

private val sharedViewModel: YourViewModel by viewModels()

3. Inside DialogFragment declare ViewModel by

private val sharedViewModel: YourViewModel by viewModels(ownerProducer = { requireParentFragment() })

Elevenses

Really appreciated. Nicely described. – Haemagglutinate

Is there an updated version where we show it using android navigation? – Aldas

@Aldas you can use the same by viewModels delegate because the navigation component uses the childFragmentManager as well. – Pinter

what about the opposite case, get viewModel for a fragment that opened by dialoge. so i need viewmodel between parent (dialoge), and fragment [child]? – Simsar

hmmm this didn't work. app crashes when dialog fragment tries to get the vm – Playmate