Flutter tabview refresh issue

Question

I have a TabBarView in my main.dart and every tab got a class to show the content(it's listview object), when i go between the tabs, the listview page refresh everytime, is it normal for tabbarview? I don't expect it will refresh everytime when i go between the tabs.

is it the problem my class? how to fix this? the code is something like this.

    class ListWidget extends StatefulWidget {
  final catID;

  ListWidget(this.catID);


  _ListWidgetState createState() => new _ListWidgetState(catID);
}

class _ListWidgetState extends State<ListWidget> {

  var catID;

  void initState() {
    super.initState();
    _fetchListData();
  }

  @override

  Widget build(BuildContext context) {
    // TODO: implement build

    return new Scaffold(.......
}

Answer 1

MahMoos is right, however it's good to have an example here ...

1. Use AutomaticKeepAliveClientMixin
2. override wantKeepAlive property and return true

`

class ListWidget extends StatefulWidget {

  @override
  _ListWidgetState createState() => _ListWidgetState();

}

class _ListWidgetState extends State<ListWidget> with 
                  AutomaticKeepAliveClientMixin<ListWidget>{ // ** here

  @override
  Widget build(BuildContext context) {
    super.build(context)
    return Container();
  }

  @override
  bool get wantKeepAlive => true; // ** and here
}