I used Expandable in NestedScrollView and add ScrollOnExpand to fully display the widget that exceeds the screen.

The problem is that triggering ScrollOnExpand when the Widget exceeds the upper area of ​​the screen will cause the screen to scroll to the top:

NestedScrollView(
      headerSliverBuilder: (BuildContext context, bool innerBoxIsScrolled) {
        return <Widget>[
          SliverAppBar(
            expandedHeight: 200.0,
            flexibleSpace: FlexibleSpaceBar(
              title: Text('SliverAppBar'),
            ),
            pinned: true,
          ),
        ];
      },
      body: CustomScrollView(
        slivers: [
          SliverList.builder(
            itemCount: 20,
            itemBuilder: (BuildContext context, int index) {
              return Container(
                key: ValueKey('test1 $index'),
                margin: EdgeInsets.all(30),
                color: Colors.grey,
                child: ExpandableNotifier(
                  key: ValueKey('test2 $index'),
                  child: ScrollOnExpand(
                    key: ValueKey('test3 $index'),
                    child: Column(
                      key: ValueKey('test4 $index'),
                      children: [
                        ExpandableTheme (
                          data:ExpandableThemeData(
                            animationDuration: Duration(milliseconds: 1000),
                          ),
                          child: ExpandablePanel(
                            key: ValueKey('test5 $index'),
                            header: Text('test $index'),
                            collapsed: Text('test collapsed $index'),
                            expanded: SizedBox(height:100,child: Text('test expanded $index')),
                          ),
                        ),
                        ExpandableButton(child: Text('button $index') ,)
                      ],
                    ),
                  ),
                ),
              );
            },
          ),
        ],
      ),
    )

I found a similar question in the author’s Github, but it didn’t work.