How To Set Up Diamond Tabbar With Flutter Using Android

TabBar(
      unselectedLabelColor: Colors.blueGrey,
      indicatorPadding: EdgeInsets.only(left: 30, right: 30),
      indicator: ShapeDecoration(
          color: Colors.blueGrey,
          shape: BeveledRectangleBorder(
              borderRadius: BorderRadius.circular(10),
              side: BorderSide(
                color: Colors.blueGrey,
              )
          )
      ),
      tabs: [
        Tab(
          child: Align(
            alignment: Alignment.center,
            child: Text("HOME"),
          ),
        ),
        Tab(
          child: Align(
            alignment: Alignment.center,
            child: Text("MESSAGE"),
          ),
        ),
        Tab(
          child: Align(
            alignment: Alignment.center,
            child: Text("GAMES"),
          ),
        ),
      ]),
),
body: TabBarView(children: [
  Icon(Icons.home, size: 50),
  Icon(Icons.message, size: 50),
  Icon(Icons.games, size: 50),
]),

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: 'App Design',
      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 DefaultTabController(
        length: 3,
        child: Scaffold(
          appBar: AppBar(
            centerTitle: true,
            title: Text('Diamond TabBar'),
            backgroundColor: Colors.pinkAccent,
            elevation: 0,
            bottom: TabBar(
                unselectedLabelColor: Colors.blueGrey,
                indicatorPadding: EdgeInsets.only(left: 30, right: 30),
                indicator: ShapeDecoration(
                    color: Colors.blueGrey,
                    shape: BeveledRectangleBorder(
                        borderRadius: BorderRadius.circular(10),
                        side: BorderSide(
                          color: Colors.blueGrey,
                        )
                    )
                ),
                tabs: [
                  Tab(
                    child: Align(
                      alignment: Alignment.center,
                      child: Text("HOME"),
                    ),
                  ),
                  Tab(
                    child: Align(
                      alignment: Alignment.center,
                      child: Text("MESSAGE"),
                    ),
                  ),
                  Tab(
                    child: Align(
                      alignment: Alignment.center,
                      child: Text("GAMES"),
                    ),
                  ),
                ]),
          ),
          body: TabBarView(children: [
            Icon(Icons.home, size: 50),
            Icon(Icons.message, size: 50),
            Icon(Icons.games, size: 50),
          ]),
        )
    );
  }
}