How To Use Async And Await Using Flutter Android App

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'After Layout',
      home: new AsyncAwait(),
    );
  }
}

class AsyncAwait extends StatefulWidget {
  @override
  _AsyncAwaitState createState() => _AsyncAwaitState();
}

class _AsyncAwaitState extends State<AsyncAwait> {
  bool _isLoading = false;

  void _asyncAction() async {
    setState(() => _isLoading = true);

    await Future.delayed(Duration(seconds: 5));

    setState(() => _isLoading = false);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.amber,
          title: Text("Async and Await"
          )),
      body: Center(
        child: _isLoading
            ? CircularProgressIndicator()
            : RaisedButton(
          child: Text("Start Asyncronous action",style: TextStyle(color: Colors.white),),
          color: Colors.amber,
          onPressed: _asyncAction,
        ),
      ),
    );
  }
}