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I am creating a group-focused app that has a lot of business logic dependent on which group is currently selected by the user. Is there a way to share this selected group state between all my viewmodels?

Create a data layer that sits below all your view models and holds the source of truth for the group state(s)

<https://developer.android.com/topic/architecture#data-layer|https://developer.android.com/topic/architecture#data-layer>