How to use the new StateRestorationPolicy in Java/Kotlin?

Question

Since this topic is fairly new, could someone tell me how to use this feature? I am trying to use it in a fragment.

 override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
...
Handler().postDelayed({
        homePostAdapter!!.stateRestorationPolicy =
            RecyclerView.Adapter.StateRestorationPolicy.PREVENT_WHEN_EMPTY
    },500)
...
}

Doesn't seem to work like this. Happy to paste the complete fragment class.

For future reading, these links help:

1. https://medium.com/androiddevelopers/restore-recyclerview-scroll-position-a8fbdc9a9334
2. https://developer.android.com/reference/androidx/recyclerview/widget/RecyclerView.Adapter.StateRestorationPolicy

Answer 1

Maybe this will work for you .

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val binding = FragmentMovieActionBinding.bind(view)
        val pagingAdapter =PagingAdapter(lifecycleScope)
        binding.apply {
            rvListTypesMovies.apply {
                adapter= pagingAdapter
                pagingAdapter.stateRestorationPolicy =  RecyclerView.Adapter.StateRestorationPolicy.PREVENT_WHEN_EMPTY
                layoutManager =GridLayoutManager(requireContext(), 2)
                setHasFixedSize(true)

Im using databinding and also Flow.