Flutter 启动应用程序时,如何在Flitter的ListView中随机排列卡片?
我有一个由多张卡片组成的列表视图,如何使其在应用程序启动时,这些卡片在列表视图中的顺序是随机的?在生成卡片之前,您可以将所有要显示的元素放在一个列表中(如果它们还没有在列表中),并使用“shuffle”功能: 随机卡片 我为您构建了一个完整的工作示例:Flutter 启动应用程序时,如何在Flitter的ListView中随机排列卡片?,flutter,random,flutter-layout,Flutter,Random,Flutter Layout,我有一个由多张卡片组成的列表视图,如何使其在应用程序启动时,这些卡片在列表视图中的顺序是随机的?在生成卡片之前,您可以将所有要显示的元素放在一个列表中(如果它们还没有在列表中),并使用“shuffle”功能: 随机卡片 我为您构建了一个完整的工作示例: import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { // Thi
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: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
var imageNames = ["screen.png", "screen1.png", "screen2.png", "screen3.png", "screen4.png", "another_image.png"]; // you don't need to store the whole path
@override
void initState() {
imageNames.shuffle(); // shuffle your list of images
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: ListView(
padding: EdgeInsets.all(16),
children: [
for (String imageName in imageNames) // iterate over your list
buildImageCard('assets/images/$imageName'),
]
)));
}
}
Widget buildImageCard(String imagePath) => Card( // from https://stackoverflow.com/a/66893064/3161139
clipBehavior: Clip.antiAlias,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(24),
),
child: Column(
children: [
Stack(
children: [
Ink.image(
image: AssetImage(imagePath),
height: 240,
fit: BoxFit.cover,
),
Positioned(
bottom: 30,
right: 16,
left: 16,
child: Text(
'Interesting fact!',
style: TextStyle(
fontWeight: FontWeight.bold,
color: Colors.white,
fontSize: 24,
),
),
),
],
),
],
),
);
导入“包装:颤振/材料.省道”;
void main(){
runApp(MyApp());
}
类MyApp扩展了无状态小部件{
//此小部件是应用程序的根。
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
var imageNames=[“screen.png”、“screen1.png”、“screen2.png”、“screen3.png”、“screen4.png”、“other_image.png”];//不需要存储整个路径
@凌驾
void initState(){
imageNames.shuffle();//洗牌图像列表
super.initState();
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
正文:中(
子:ListView(
填充:边缘设置。全部(16),
儿童:[
for(imageNames中的字符串imageName)//遍历列表
buildImageCard('assets/images/$imageName'),
]
)));
}
}
小部件buildImageCard(字符串imagePath)=>Card(//来自https://stackoverflow.com/a/66893064/3161139
clipBehavior:Clip.antiAlias,
形状:圆形矩形边框(
边界半径:边界半径。圆形(24),
),
子:列(
儿童:[
堆叠(
儿童:[
墨水图像(
图像:AssetImage(图像路径),
身高:240,
适合:BoxFit.cover,
),
定位(
底数:30,
右:16,
左:16,
子:文本(
“有趣的事实!”,
样式:TextStyle(
fontWeight:fontWeight.bold,
颜色:颜色,白色,
尺寸:24,
),
),
),
],
),
],
),
);
多展示一些代码,以帮助您提高效率