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
最简单的方法是使用flutter_native_splash包
首先,把它添加到你的开发依赖项中:
dev_dependencies:
flutter_native_splash: ^1.3.1 # make sure to us the latest version
现在,你可以配置你的启动画面你喜欢:
flutter_native_splash:
android: true # show for android, you may set it to false
ios: true # show for IOS, you may set it to false
image: assets\logo.png # the default image for light and dark themes. Until now, images should be png images
image_dark: aassets\logo_dark.png # It will override the 'image' in the dark mode
color: "#ffffff" # the default color for light and dark themes
color_dark: "#0a0a0a" # will override the 'color' in the dark mode
android_gravity: fill # make the image fill the screen for android
ios_content_mode: scaleAspectFill # make the image fill the screen for android
这样做之后,运行:
flutter clean && flutter pub get && flutter pub run flutter_native_splash:create
你会注意到的。“\android\app\src\main\res*”已经改变,并添加了新的启动画面。
其他回答
在flutter中添加启动画面的最简单的方法是imho这个包: https://pub.dev/packages/flutter_native_splash
安装指南(由软件包作者提供):
1. 设置启动画面
将您的设置添加到项目的pubspec中。Yaml文件或在根项目文件夹中创建一个名为flutter_native_splash的文件。Yaml与您的设置。
flutter_native_splash:
image: assets/images/splash.png
color: "42a5f5"
图像必须为PNG文件。
你也可以在颜色中使用#。颜色:“# 42 a5f5” 如果你不想为特定平台创建启动画面,你也可以将android或ios设置为false。
flutter_native_splash:
image: assets/images/splash.png
color: "42a5f5"
android: false
如果你的图像应该使用所有可用的屏幕(宽度和高度),你可以使用填充属性。
flutter_native_splash:
image: assets/images/splash.png
color: "42a5f5"
fill: true
注意:填充属性还没有在iOS启动画面中实现。
如果你想在Android上禁用全屏闪屏,你可以使用android_disable_fullscreen属性。
flutter_native_splash:
image: assets/images/splash.png
color: "42a5f5"
android_disable_fullscreen: true
2. 运行包
添加设置后,运行with的包
Flutter pub运行flutter_native_splash:创建 当包完成运行时,你的启动画面就准备好了。
如果有人在应用验证答案后发现图像不存在,请确保您添加的是@mipmap/ic_launcher而不是@mipmap/ic_launcher .png
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。
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")),
);
}
}
最简单的方法是使用flutter_native_splash包
首先,把它添加到你的开发依赖项中:
dev_dependencies:
flutter_native_splash: ^1.3.1 # make sure to us the latest version
现在,你可以配置你的启动画面你喜欢:
flutter_native_splash:
android: true # show for android, you may set it to false
ios: true # show for IOS, you may set it to false
image: assets\logo.png # the default image for light and dark themes. Until now, images should be png images
image_dark: aassets\logo_dark.png # It will override the 'image' in the dark mode
color: "#ffffff" # the default color for light and dark themes
color_dark: "#0a0a0a" # will override the 'color' in the dark mode
android_gravity: fill # make the image fill the screen for android
ios_content_mode: scaleAspectFill # make the image fill the screen for android
这样做之后,运行:
flutter clean && flutter pub get && flutter pub run flutter_native_splash:create
你会注意到的。“\android\app\src\main\res*”已经改变,并添加了新的启动画面。