BotZ_app/lib/ui/welcome_page.dart

import 'package:flutter/material.dart';
import 'package:logger/logger.dart';
import 'package:flutter/services.dart';

var log = Logger();

class WelcomePage extends StatefulWidget {
  WelcomePage(
      {@required this.nextRoute,
      this.timeout = const Duration(seconds: 5),
      Key key})
      : assert(nextRoute != null),
        super(key: key);
  final String nextRoute;
  final Duration timeout;

  WelcomePageState createState() => WelcomePageState();
}

class WelcomePageState extends State<WelcomePage> {
  void _goToNext() async {
    // Restore overlays to exit fullscreen mode
    await SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values);
    Navigator.pushReplacementNamed(context, widget.nextRoute);
  }

  @override
  void initState() {
    log.d("Initing WelcomePage...");
    super.initState();
    SystemChrome.setEnabledSystemUIOverlays([]);
    Future.delayed(widget.timeout, _goToNext);
  }

  @override
  Widget build(BuildContext build) {
    log.d("Building WelcomePage...");
    return Material(
        color: Theme.of(context).primaryColor,
        child: Column(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: <Widget>[
              Center(
                  child: Text("Welcome to BotZ",
                      textAlign: TextAlign.center,
                      style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 35.0,
                          color: Colors.black))),
              Image.asset('images/simple_logo.png',
                  width: MediaQuery.of(context).size.width * 0.7),
              FlatButton(
                  color: Colors.green[750],
                  textColor: Colors.black,
                  padding: EdgeInsets.all(8.0),
                  splashColor: Colors.greenAccent,
                  child: Text("Go"),
                  onPressed: _goToNext)
            ]));
  }
}