"restore scroll position in android Paging adapter when user go to another fragment or activity from adapter" problem

Question

How can ı restore paging adapter item state when ı move to another fragment? I tried article below but it didnt work. https://medium.com/@florina.muntenescu

private fun loadData() {
        viewModel.apply {
            lifecycleScope.launch{
                viewModel.getMorePopularMovies().collectLatest { pagingData ->
                    dataAdapter.submitData(viewLifecycleOwner.lifecycle, pagingData)

                }
            }
        }

    }

fun getMorePopularMovies() = Pager(
        PagingConfig(pageSize = 3)
) {
    VerticalMoviePagingSource(api, "Popular")
}.flow

I have the same problem, always go on top when back to fragment — Javi Chaqués, Aug 19 '21 at 10:34

score 2 · Accepted Answer · edited Oct 29 '21 at 05:10

2

Try adding .cachedIn(viewModelScope) in your viewModel code. For your case you will get:

  fun getMorePopularMovies() = Pager(
        PagingConfig(pageSize = 3)
) {
    VerticalMoviePagingSource(api, "Popular")
}.flow.cachedIn(viewModelScope)

And try adding in your fragment:

adapter.stateRestorationPolicy =
        RecyclerView.Adapter.StateRestorationPolicy.PREVENT_WHEN_EMPTY

If it doesn't work then there is another problem in your code, I guess.

edited Oct 29 '21 at 05:10

Troll

1,895
3
15
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answered Oct 28 '21 at 12:09

SimpleX

46
3

it worked, thanks:))) – Ahmet Faruk Çuha Oct 29 '21 at 16:55

"restore scroll position in android Paging adapter when user go to another fragment or activity from adapter" problem

1 Answers1