basic-layout-slivers.dart

return SafeArea(
    child: CustomScrollView(
      controller: controller,
      slivers: <Widget>[
        SliverAppBar(
          pinned: true,
          expandedHeight: appBarHeight,
          floating: true,
          flexibleSpace: Stack(
            children: <Widget>[
              //image background
              Text(
                "FlutteRotate",
                style: TextStyle(color: Colors.white, fontSize: 18.0),
              ),
              Align(
                  alignment: Alignment.bottomRight,
                  child: FloatingActionButton(
                    child: Icon(
                      Icons.add,
                      color: Colors.red,
                    ),
                    onPressed: () {},
                  )),
            ],
          ),
        ),
        SliverList(delegate:
            SliverChildBuilderDelegate((BuildContext context, int index) {
          return ListTile(title: Text("Flutter / $index"));
        }))
      ],
    ),
  );