How To Create Circular Button Using Flutter Android App

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.indigo[800],
        title: Text("Circular Button"),
      ),
      body: Center(
          child: GestureDetector(
            onTap: () {},
            child: ClipOval(
              child: Container(
                color: Colors.indigo[800],
                height: 120.0,
                width: 120.0,
                child: Center(child: Text('Circular Button',
                  style: TextStyle(
                      color: Colors.white
                  ),
                )),
              ),
            ),
          )),
    );
  }
}