|1| Bottom AppBar

Flutter |1| Bottom AppBar:

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: "Bottam AppBar",
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomepage(),
    );
  }
}

class MyHomepage extends StatefulWidget {
  @override
  _MyHomepageState createState() => _MyHomepageState();
}
class _MyHomepageState extends State<MyHomepage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      floatingActionButton: FloatingActionButton(
        child: const Icon(Icons.add),
        onPressed: () {},
      ),
      bottomNavigationBar: BottomAppBar(
        color: Colors.red,
        shape: CircularNotchedRectangle(),
        notchMargin: 6.0,
        child: new Row(
          mainAxisSize: MainAxisSize.max,
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: <Widget>[
            IconButton(icon: Icon (Icons.menu),
              onPressed: () {},
              color: Colors.white,
            ),
            IconButton(icon: Icon (Icons.search),
              onPressed: () {},
              color: Colors.white,
            ),
          ],
        ),
      ),
    );
  }
}