Scoping a viewmodel to multiple fragments (not activity) using the navigation component

Question

I\'m using the navigation component, I want a view model to be shared between a few fragments but they should be cleared when I leave the fragments (hence not scoping them t

Answer 1

so when i posted this the functionality was there but didn't quite work as expected, since then i now use this all the time and this question keeps getting more attention so thought i would post an up to date example,

using

//Navigation
implementation "androidx.navigation:navigation-fragment:2.2.0-rc04"
// Navigation UI
implementation "androidx.navigation:navigation-ui:2.2.0-rc04"

i get the view model store owner like this

private ViewModelStoreOwner getStoreOwner() {

        NavController navController = Navigation
                .findNavController(requireActivity(), R.id.root_navigator_fragment);
        return navController.getViewModelStoreOwner(R.id.root_navigator);
}

im using the one activity multiple fragments implementation, but using this i can effectively tie my view models to just the scoped fragments and with the new live data you can even limit that too

the first id comes from the nav graphs fragment

and the second comes from the id of the nav graph

and then you can use it like so

private void setUpSearchViewModel() {
    searchViewModel = new ViewModelProvider(getStoreOwner()).get(SearchViewModel.class);
}