Getting scroll index from scrolling position in pixels listview flutter

Question

Is there a way we can use ScrollController.position.pixels to know the scrolling index of a listview in flutter? I'm trying to restore the last scrolling index between app restarts.

Does your `Listview` item have the same height? You like to save scrollPosition on phone storage? — Md. Yeasin Sheikh, Sep 05 '21 at 03:25
No.. list item has different height. I'd like to save index in shared preferences which I can retrieve later. — Noor, Sep 05 '21 at 03:35

score 0 · Answer 1 · answered Aug 02 '22 at 01:28

You can use the flutter_scrollview_observer lib to implement your desired functionality without invasivity

Create and use instance of ListView normally.

ListView _buildListView() {
  return ListView.separated(
    ...
  );
}

Pass the ListView instance to the ListViewObserver, then you can obtain the desired result in the onObserve callback

ListViewObserver(
  child: _buildListView(),
  onObserve: (resultModel) {
    print('firstChild.index -- ${resultModel.firstChild?.index}');
    print('displaying -- ${resultModel.displayingChildIndexList}');
  },
)

Getting scroll index from scrolling position in pixels listview flutter

1 Answers1