Circular Notched Rectangle With Different Design In Flutter

floatingActionButton: new FloatingActionButton.extended(
  onPressed: () {},
  icon: new Icon(Icons.add),
  label: const Text("label"),
  backgroundColor: Colors.pinkAccent,
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
bottomNavigationBar: BottomAppBar(
  shape: CircularNotchedRectangle(),
  child: Material(
    child: SizedBox(
      width: double.infinity,
      height: 60.0,
    ),
    color: Colors.pinkAccent,
  ),
),

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);


  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {

      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        backgroundColor: Colors.pinkAccent,
        title: Text('Circular Notched Rectangle'),
      ),
      body: Center(

        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
        floatingActionButton: new FloatingActionButton.extended(
          onPressed: () {},
          icon: new Icon(Icons.add),
          label: const Text("label"),
          backgroundColor: Colors.pinkAccent,
        ),
        floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
        bottomNavigationBar: BottomAppBar(
          shape: CircularNotchedRectangle(),
          child: Material(
            child: SizedBox(
              width: double.infinity,
              height: 60.0,
            ),
            color: Colors.pinkAccent,
          ),
        ),
    );
  }
}