闪屏中的闪屏实现 [英] Splash screen implementation in flutter

问题描述

我是Flutter的新手，我想在我的应用程序中显示启动画面。我使用了initState（）和导航器。但这没用。该应用程序将打开显示初始屏幕，但之后不会导航到下一个屏幕。

I am new to Flutter and I wanted to have splash screen in my app. I used initState() and the navigator. But it didn't work. The app opens the splashscreen appears but after that it does not navigate to the next screen.

我的main.dart

My main.dart

import 'package:flutter/material.dart';
import 'package:bmi/HomePage.dart';
import 'dart:async';

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

 class MyApp extends StatelessWidget{
 @override
 Widget build(BuildContext context) {
    return SplashScreen();
 }
}

class SplashScreen extends StatefulWidget{
  @override
  State<StatefulWidget> createState() {
    return SplashScreenState();
  }
}

class SplashScreenState extends State<SplashScreen>{
  @override
  void initState() {
    super.initState();
    Future.delayed(
      Duration(
        seconds: 4
      ),
      (){
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => HomePage(),
          )
        );
      }
  );
}
@override
Widget build(BuildContext context) {
  return MaterialApp(
    home: Scaffold(
      backgroundColor: Colors.red,
      body: Text(
        'Welcome to BMI Calculator',
        style: new TextStyle(
          fontSize: 15.0,
          color: Colors.white,
          fontWeight: FontWeight.bold
        ),
      ),
    ),
  );
}
}

还有我的HomePage.dart

And my HomePage.dart

import 'package:flutter/material.dart';

class HomePage extends StatelessWidget{
   @override
   Widget build(BuildContext context) {
      return MaterialApp(
        home: Scaffold(
          appBar: AppBar(
            backgroundColor: Colors.red,
             title: Text(
              'BMI Calculator',
               style: new TextStyle(
                 color: Colors.white
               ),
            ),
          ),
        ),
      );
    }
  }

我该如何解决？

由于我是新手，所以我不知道这是否是实现splashScreen的正确方法，如果还有其他更简单的方法，也请您提出建议。

Since I am new to flutter I dont know whether this is the right way to implement splashScreen if there are any other easier ways can you please suggest that also.

谢谢。

推荐答案

已更正代码：

MaterialApp应该是所有小部件的父级（根）。

MaterialApp should be the parent(root) of all Widgets.

import 'package:flutter/material.dart';
import 'package:bmi/HomePage.dart';
import 'dart:async';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(home: SplashScreen()); // define it once at root level.
  }
}

class SplashScreen extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return SplashScreenState();
  }
}

class SplashScreenState extends State<SplashScreen> {
  @override
  void initState() {
    super.initState();
    Future.delayed(Duration(seconds: 4), () {
      Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => HomePage(),
          ));
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.red,
      body: Text(
        'Welcome to BMI Calculator',
        style: new TextStyle(
            fontSize: 15.0, color: Colors.white, fontWeight: FontWeight.bold),
      ),
    );
  }
}

class HomePage extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.red,
          title: Text(
            'BMI Calculator',
            style: new TextStyle(
                color: Colors.white
            ),
          ),
        ),
    );
  }

}

这篇关于闪屏中的闪屏实现的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！