How to make persistent AppBar and floating widget just below AppBar in flutter

Question

I want to make my AppBar persistent (it should not float like tabbar) while I want to place a widget or say tabbar just below appbar which will float and be pinned to appbar just like spotify app of library page see below for proper understanding

So far I have used slivers in flutter not able to achieve what I want, Please check my code and correct me,

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(body: Test()),
    );
  }
}
class Test extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: DefaultTabController(
        length: 2,
        child: NestedScrollView(
          headerSliverBuilder: (context, value) {
            return [
              SliverAppBar(excludeHeaderSemantics: true,
                floating: true,
                           
                pinned: true,
                title: Text('This should be fixed not moving'),
                bottom: TabBar(
                  tabs: [
                    Tab( text: "Call"), // this shoudl be floating n pinned 
                    Tab( text: "Message"),// this should be floating n pinned
                  ],
                ),
              ),
            ];
          },
          body: TabBarView(
            children: [
              Container(child: ListView.builder(
                  itemCount: 100,
                  itemBuilder: (context,index){
                return Text("Item $index");
              })),
              Container(child: ListView.builder(
                  itemCount: 100,
                  itemBuilder: (context,index){
                    return Text("Item $index");
                  })),
            ],
          ),
        ),
      ),
    );

  }
}

Answer 1

Code below is working as I wanted,

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(body: Test()),
    );
  }
}

class Test extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: DefaultTabController(
        length: 2,
        child: NestedScrollView(
          floatHeaderSlivers: true,
          headerSliverBuilder: (context, value) {
            return [
              SliverAppBar(
                floating: true,
                pinned: true,
                
                title: Text('This should be fixed not moving'),
              ),
              SliverList(
                delegate: SliverChildListDelegate.fixed(
                  [
                    TabBar(
                      labelColor: Colors.blue,
                      tabs: [
                        Tab(text: "Call"),
                        Tab(text: "Message"),
                      ],
                    ),
                  ],
                ),
              ),
            ];
          },
          body: TabBarView(
            children: [
              Container(
                  child: ListView.builder(
                      itemCount: 100,
                      itemBuilder: (context, index) {
                        return Text("Item $index");
                      })),
              Container(
                  child: ListView.builder(
                      itemCount: 100,
                      itemBuilder: (context, index) {
                        return Text("Item $index");
                      })),
            ],
          ),
        ),
      ),
    );
  }
}