Flutter : How to add scroll indicator in ListView

Thanks to Günter Zöchbauer.

You can wrap your ListView in Scrollbar

Scrollbar(
    child: ListView.builder(
      itemCount: 50,
      itemBuilder: (context, index) => ListTile(title: Text("Item= ${index + 1}"),),),
)

I think better to use CupertinoScrollbar instead of Scrollbar. CupertinoScrollbar is can touch and scroll to the bottom..

Ex:

 CupertinoScrollbar(
            child: ListView.builder(...),

Or

Scrollbar(
    child: ListView.builder(...),

You can implement this designer scrollbar library :

1. draggable_scrollbar

2. alphabet scrolling

OR

You can wrap ListView in Scrollbar widget

Scrollbar(
    child: ListView.builder(...),
)