import 'dart:async';
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(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: SplashPage(),
      routes: {
        '/page2': (_) => Page2(),
      },
    );
  }
}

class SplashPage extends StatefulWidget {
  SplashPage({Key key}) : super(key: key);

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

class _SplashPageState extends State<SplashPage> {
  @override
  void initState() {
    super.initState();
    startTimer();
  }

  startTimer() {
    Timer(Duration(milliseconds: 1500), () async {
      doDummyFetch().then((res) async {
        print('READY TO NAVIGATE');
        await Navigator.of(context).pushNamed('/page2');
        startTimer();
      });
    });
  }

  Future<bool> doDummyFetch() async {
    Future.delayed(Duration(milliseconds: 750));
    return true;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Splash'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('Splash Page'),
            const SizedBox(height: 20),
            const CircularProgressIndicator(),
          ],
        ),
      ),
    );
  }
}

class Page2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Page 2'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('Page 2'),
          ],
        ),
      ),
    );
  }
}