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2024-10-06 10:00:02

添加一个启动屏幕颤振应用程序

你会如何在Flutter应用程序中添加启动画面?它应该在任何其他内容之前加载和显示。目前，在Scaffold(home:X)小部件加载之前，会有一个短暂的颜色闪烁。

当前回答

这是在Flutter中添加动态启动画面的最佳方法。

主要。飞镖

import 'package:flutter/material.dart';
import 'constant.dart';

void main() => runApp(MaterialApp(
      title: 'GridView Demo',
      home: SplashScreen(),
      theme: ThemeData(
        primarySwatch: Colors.red,
        accentColor: Color(0xFF761322),
      ),
      routes: <String, WidgetBuilder>{
        SPLASH_SCREEN: (BuildContext context) => SplashScreen(),
        HOME_SCREEN: (BuildContext context) => BasicTable(),
        //GRID_ITEM_DETAILS_SCREEN: (BuildContext context) => GridItemDetails(),
      },
    ));

SPLASHSCREEN。飞镖

import 'dart:async';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:app_example/constants.dart';


class SplashScreen extends StatefulWidget {
  @override
  SplashScreenState createState() => new SplashScreenState();
}

class SplashScreenState extends State<SplashScreen>
    with SingleTickerProviderStateMixin {
  var _visible = true;

  AnimationController animationController;
  Animation<double> animation;

  startTime() async {
    var _duration = new Duration(seconds: 3);
    return new Timer(_duration, navigationPage);
  }

  void navigationPage() {
    Navigator.of(context).pushReplacementNamed(HOME_SCREEN);
  }

@override
dispose() {
  animationController.dispose();  
  super.dispose();
}

  @override
  void initState() {
    super.initState();
    animationController = new AnimationController(
      vsync: this,
      duration: new Duration(seconds: 2),
    );
    animation =
        new CurvedAnimation(parent: animationController, curve: Curves.easeOut);

    animation.addListener(() => this.setState(() {}));
    animationController.forward();

    setState(() {
      _visible = !_visible;
    });
    startTime();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        fit: StackFit.expand,
        children: <Widget>[
          new Column(
            mainAxisAlignment: MainAxisAlignment.end,
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              Padding(
                padding: EdgeInsets.only(bottom: 30.0),
                child: new Image.asset(
                  'assets/images/powered_by.png',
                  height: 25.0,
                  fit: BoxFit.scaleDown,
                ),
              )
            ],
          ),
          new Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              new Image.asset(
                'assets/images/logo.png',
                width: animation.value * 250,
                height: animation.value * 250,
              ),
            ],
          ),
        ],
      ),
    );
  }
}

常量。飞镖

String SPLASH_SCREEN='SPLASH_SCREEN';
String HOME_SCREEN='HOME_SCREEN';

主屏幕。飞镖

import 'package:flutter/material.dart';

class BasicTable extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("Table Widget")),
      body: Center(child: Text("Table Widget")),
    );
  }
}
2019-11-14 12:53:04

其他回答

如果你想要一个次要的启动画面(在原生画面之后)，这里有一个简单的例子:

class SplashPage extends StatelessWidget {
  SplashPage(BuildContext context) {
    Future.delayed(const Duration(seconds: 3), () {
      // Navigate here to next screen
    });
  }

  @override
  Widget build(BuildContext context) {
    return Text('Splash screen here');
  }
}
2019-07-11 17:38:16

这是在Flutter中添加动态启动画面的最佳方法。

主要。飞镖

import 'package:flutter/material.dart';
import 'constant.dart';

void main() => runApp(MaterialApp(
      title: 'GridView Demo',
      home: SplashScreen(),
      theme: ThemeData(
        primarySwatch: Colors.red,
        accentColor: Color(0xFF761322),
      ),
      routes: <String, WidgetBuilder>{
        SPLASH_SCREEN: (BuildContext context) => SplashScreen(),
        HOME_SCREEN: (BuildContext context) => BasicTable(),
        //GRID_ITEM_DETAILS_SCREEN: (BuildContext context) => GridItemDetails(),
      },
    ));

SPLASHSCREEN。飞镖

import 'dart:async';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:app_example/constants.dart';


class SplashScreen extends StatefulWidget {
  @override
  SplashScreenState createState() => new SplashScreenState();
}

class SplashScreenState extends State<SplashScreen>
    with SingleTickerProviderStateMixin {
  var _visible = true;

  AnimationController animationController;
  Animation<double> animation;

  startTime() async {
    var _duration = new Duration(seconds: 3);
    return new Timer(_duration, navigationPage);
  }

  void navigationPage() {
    Navigator.of(context).pushReplacementNamed(HOME_SCREEN);
  }

@override
dispose() {
  animationController.dispose();  
  super.dispose();
}

  @override
  void initState() {
    super.initState();
    animationController = new AnimationController(
      vsync: this,
      duration: new Duration(seconds: 2),
    );
    animation =
        new CurvedAnimation(parent: animationController, curve: Curves.easeOut);

    animation.addListener(() => this.setState(() {}));
    animationController.forward();

    setState(() {
      _visible = !_visible;
    });
    startTime();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        fit: StackFit.expand,
        children: <Widget>[
          new Column(
            mainAxisAlignment: MainAxisAlignment.end,
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              Padding(
                padding: EdgeInsets.only(bottom: 30.0),
                child: new Image.asset(
                  'assets/images/powered_by.png',
                  height: 25.0,
                  fit: BoxFit.scaleDown,
                ),
              )
            ],
          ),
          new Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              new Image.asset(
                'assets/images/logo.png',
                width: animation.value * 250,
                height: animation.value * 250,
              ),
            ],
          ),
        ],
      ),
    );
  }
}

常量。飞镖

String SPLASH_SCREEN='SPLASH_SCREEN';
String HOME_SCREEN='HOME_SCREEN';

主屏幕。飞镖

import 'package:flutter/material.dart';

class BasicTable extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("Table Widget")),
      body: Center(child: Text("Table Widget")),
    );
  }
}
2019-11-14 12:53:04

当我们必须在应用程序启动之前获得用户位置或其他数据时，我们可以在flutter中使用自定义启动画面，这将使您的应用程序用户友好

代码如下:示例:-

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();
    when we have to get data we can show splash 
    Like this:- 
    FutureMethodForData.then((value) {
       Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => HomePage(),
          )
        );

    });
    Or we can show splash for fix duration like this:-
    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: // add image text or whatever you want as splash
    ),
  );
}
}
2021-12-28 12:00:03

目前还没有一个很好的例子，但你可以自己使用每个平台的本地工具:

iOS: https://docs.nativescript.org/tooling/publishing/creating-launch-screens-ios

Android: https://www.bignerdranch.com/blog/splash-screens-the-right-way/

订阅issue 8147以获得启动画面示例代码的更新。如果iOS上的启动画面和应用程序之间的黑色闪烁让你感到困扰，请订阅第8127期更新。

编辑:自2017年8月31日起，对启动画面的改进支持现在可以在新的项目模板中使用。看到# 11505。

2017-05-09 20:43:55

对于Android，转到这个路径，

Android > app > SRC > main > res > drawable > launcher_background.xml

默认代码为白色背景屏幕。 像这样,

<!-- You can insert your own image assets here -->
 <item>
    <bitmap
        android:gravity="center"
        android:src="@mipmap/launch_image" />
</item>

您可以通过添加图标或任何自定义设计来更改它的颜色或修改它。更多的定制细节签出这为android。

为Ios

在Xcode中打开Ios项目。

选择Runner，然后。内部Runner文件夹Main。故事板文件在那里， 在这里输入图像描述

默认情况下，它的颜色是白色，你可以根据自己的要求自定义或改变颜色，更多的自定义检查这个Ios。

2021-01-30 05:37:45

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