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Vector Fragment

Vector Fragment is an abstract class that extends the AndroidX Fragment class.

VectorFragment class also has an abstract renderState(state: S, renderer: (S) -> Unit) method. It is supposed to be the place where Views update themselves according to the state update provided by the ViewModel.

You are free to choose your own implementation and not extend from VectorFragment at all.

An example of how the renderState function should look like:

class UsersListFragment: VectorFragment() {

    private val viewModel: UserViewModel by viewModel()

    override fun onViewCreated(...) {
        renderState(viewModel) { state ->
            // Update your views here
        }
    }
}

The renderState method internally launches a coroutine in a Coroutine Scope scoped to fragment's view-lifecycle.

Vector is not opinionated about what should be used as Views in an app, so please feel free to use whatever you like. However, the VectorViewModel class exposes the current state observable as a Kotlin Flow object, so it helps if your View object is a CoroutineScope.