customAppBar.dart

Scaffold(
      appBar: AppBar(
        title: AutoSizeText('Doctors List'),
        bottom: PreferredSize(child: Row(children: <Widget>[
customButton((){},Icons.filter,'Filter'),
customButton((){},Icons.filter,'Filter'),
customButton((){},Icons.filter,'Filter'),
        ],), preferredSize: Size.fromHeight(70)),
      )
      );

customButton.dart

customButton(VoidCallback callback, IconData icon, String desc){
 return InkWell(
        onTap: callback,
              child: Material(
              elevation:0,
          borderRadius: BorderRadius.circular(10),
          color: Colors.white.withOpacity(.5),
          child: Padding(
            padding: const EdgeInsets.all(15.0),
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.center,
              children: <Widget>[
              Icon(icon,color: Colors.white,),
              SizedBox(width:10),
              Text(desc,style: TextStyle(color: Colors.white),
            ],),
          ),
        ),
      ),
    );       
}

customTabAppBar.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class ConnectAccountPage extends StatefulWidget {
  @override
  _ConnectAccountPageState createState() => _ConnectAccountPageState();
}

class _ConnectAccountPageState extends State<ConnectAccountPage> {
  int sharedValue = 0;
  final Map<int, Widget> logoWidgets = const <int, Widget>{
    0: Text('Accepted'),
    1: Text('Pending'),
  };

  List<Widget> _children = [
    AcceptedListPage(),
    PendingListPage(),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Column(
          children: <Widget>[
            Container(
              width: MediaQuery.of(context).size.width,
              height: 50,
              padding: const EdgeInsets.all(8),
              child: CupertinoSegmentedControl<int>(
                selectedColor: Colors.red,
                borderColor: Colors.red,
                children: logoWidgets,
                onValueChanged: (int val) {
                  setState(() {
                    sharedValue = val;
                  });
                },
                groupValue: sharedValue,
              ),
            ),
            Expanded(
              child: _children[sharedValue],
            ),
           
          ],
        ));
  }
}