Android 颤振:如何在代码中的每个列表项之间添加分隔符?
如何将分隔符添加到列表中?我在Android上使用Flutter。我想在每个列表项之间添加一个分隔符,我想给分隔符上色并添加样式 我尝试添加Android 颤振:如何在代码中的每个列表项之间添加分隔符?,android,ios,flutter,Android,Ios,Flutter,如何将分隔符添加到列表中?我在Android上使用Flutter。我想在每个列表项之间添加一个分隔符,我想给分隔符上色并添加样式 我尝试添加新的分隔符()但我有错误。我还尝试了返回新的分隔符() 以下是我的应用程序的屏幕截图: 这是我的代码: import 'package:flutter/material.dart'; import 'package:flutter/foundation.dart'; void main() => runApp(const MyApp()); cla
新的分隔符()代码>但我有错误。我还尝试了返回新的分隔符()代码>
以下是我的应用程序的屏幕截图:
这是我的代码:
import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp();
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(
primarySwatch: Colors.purple,
buttonTheme: const ButtonThemeData(
textTheme: ButtonTextTheme.primary,
)
),
home: const MyHomePage(),
);
}
}
class Kitten {
const Kitten({this.name, this.description, this.age, this.imageurl});
final String name;
final String description;
final int age;
final String imageurl;
}
final List<Kitten> _kittens = <Kitten>[
Kitten(
name: "kitchen",
description: "mehraboon",
age: 2,
imageurl:
"https://images.pexels.com/photos/104827/cat-pet-animal-domestic-
104827.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=350",
),
Kitten(
name: "garage",
description: "khashen",
age: 1,
imageurl:
"https://images.pexels.com/photos/4602/jumping-cute-playing-animals.jpg?
auto=compress&cs=tinysrgb&dpr=2&h=350",
),
Kitten(
name: "bedroom",
description: "khar zoor",
age: 5,
imageurl:
"https://images.pexels.com/photos/978555/pexels-photo-978555.jpeg?
auto=compress&cs=tinysrgb&dpr=2&h=350",
),
Kitten(
name: "living room",
description: "chorto",
age: 3,
imageurl:
"https://images.pexels.com/photos/209037/pexels-photo-209037.jpeg?
auto=compress&cs=tinysrgb&dpr=2&h=350",
),
];
class MyHomePage extends StatelessWidget {
const MyHomePage({Key key}) : super(key: key);
Widget _dialogBuilder(BuildContext context, Kitten kitten) {
return SimpleDialog(contentPadding: EdgeInsets.zero, children: [
Image.network(kitten.imageurl, fit: BoxFit.fill),
Padding(
padding: const EdgeInsets.all(16.0),
child:
Column(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
Text(kitten.name),
Text('${kitten.age}'),
SizedBox(
height: 16.0,
),
Text(kitten.description),
Align(
alignment: Alignment.centerRight,
child: Wrap(
children: [
FlatButton(onPressed: () {}, child: const
Text("noooo!"),color: Colors.red,),
Padding(padding: const EdgeInsets.all(2.0),),
RaisedButton(onPressed: () {}, child: const
Text("yesss!"),color: Colors.green)
],
),
)
]))
]);
}
Widget _listItemBuilder(BuildContext context, int index) {
return new GestureDetector(
onTap: () => showDialog(
context: context,
builder: (context) => _dialogBuilder(context, _kittens[index])),
child:
Container(
padding: EdgeInsets.all( 16.0),
alignment: Alignment.centerLeft,
child: Text(_kittens[index].name,
style: Theme.of(context).textTheme.headline),
),
) ;
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Keys"),
centerTitle: true,
),
body: ListView.builder(
itemCount: _kittens.length,
itemExtent: 60.0,
itemBuilder: _listItemBuilder,
),
);
}
}
导入“包装:颤振/材料.省道”;
进口“包装:颤振/基础.dart”;
void main()=>runApp(const MyApp());
类MyApp扩展了无状态小部件{
常量MyApp();
@凌驾
小部件构建(构建上下文){
返回材料PP(
主题:主题数据(
原色样本:颜色。紫色,
buttonTheme:const buttonTheme数据(
textTheme:buttonexttheme.primary,
)
),
主页:const MyHomePage(),
);
}
}
班猫{
const Kitten({this.name,this.description,this.age,this.imageurl});
最后的字符串名;
最终字符串描述;
最终积分;
最终字符串imageurl;
}
最终名单_小猫=[
小猫(
名称:“厨房”,
描述:“mehraboon”,
年龄:2岁,
图像URL:
"https://images.pexels.com/photos/104827/cat-pet-animal-domestic-
104827.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=350“,
),
小猫(
名称:“车库”,
描述:“哈申”,
年龄:1,,
图像URL:
"https://images.pexels.com/photos/4602/jumping-cute-playing-animals.jpg?
auto=compress&cs=tinysrgb&dpr=2&h=350“,
),
小猫(
姓名:“卧室”,
描述:“哈尔·祖尔”,
年龄:5岁,
图像URL:
"https://images.pexels.com/photos/978555/pexels-photo-978555.jpeg?
auto=compress&cs=tinysrgb&dpr=2&h=350“,
),
小猫(
名称:“客厅”,
描述:“chorto”,
年龄:3岁,
图像URL:
"https://images.pexels.com/photos/209037/pexels-photo-209037.jpeg?
auto=compress&cs=tinysrgb&dpr=2&h=350“,
),
];
类MyHomePage扩展了无状态小部件{
constmyhomepage({Key}):超级(Key:Key);
Widget\u dialogBuilder(BuildContext上下文,Kitten Kitten){
返回SimpleDialog(contentPadding:EdgeInsets.zero,子项:[
Image.network(kitten.imageurl,fit:BoxFit.fill),
填充物(
填充:常数边集全部(16.0),
儿童:
列(crossAxisAlignment:crossAxisAlignment.stretch,子项:[
文本(kitten.name),
文本(“${kitten.age}”),
大小盒子(
身高:16.0,
),
文本(kitten.description),
对齐(
对齐:alignment.centerRight,
孩子:包裹(
儿童:[
扁平按钮(按下时:(){},子项:常量
文本(“noooo!”),颜色:Colors.red,),
填充(填充:常量边集全部(2.0),),
RaisedButton(按下时:(){},子项:常量
文本(“是!”),颜色:Colors.green)
],
),
)
]))
]);
}
Widget\u listItemBuilder(BuildContext上下文,int索引){
返回新的手势检测器(
onTap:()=>showDialog(
上下文:上下文,
生成器:(context)=>\u dialogBuilder(context,\u kittens[index]),
儿童:
容器(
填充:所有边缘设置(16.0),
对齐:alignment.centerLeft,
子项:文本(_kittens[index]。名称,
风格:Theme.of(context.textTheme.headline),
),
) ;
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(“键”),
标题:对,
),
正文:ListView.builder(
itemCount:_kittens.length,
项目范围:60.0,
itemBuilder:\u listItemBuilder,
),
);
}
}
在本书中,他们提供的解决方案如下:
body: ListView.builder(
itemCount: _kittens.length,
itemExtent: 60.0,
itemBuilder: (context, i) {
// Add a one-pixel-high divider widget before each row in theListView.
if (i.isOdd) return new Divider(color: Colors.purple); // notice color is added to style divider
return _listItemBuilder();
},
),
...
考虑到奇数行和偶数行,应该添加分隔符
还要将分隔器pas“颜色”涂成:
将您的小部件放入容器中,并按如下所示使用BoxEdition
Container(
child: YourWidgetHere(),
decoration: BoxDecoration(
border: Border(bottom: BorderSide(color: Colors.black26))),
);
查看此问题:
它明确指出:
如果您需要使用动态元素构建列表,那么现在您必须自己处理这个问题。我建议在row小部件构建中,在底部包含一个带有列或其他内容的,但最后一个除外(可以测试index==listData.length-1
)
但是,如您所展示的示例中所示,如果您已经知道所有列表数据,或者您构建它时没有使用ListView.builder
,那么您可以并且应该使用命名构造函数ListView.divideTiles
ListView(
children: ListTile.divideTiles( // <-- ListTile.divideTiles
context: context,
tiles: [
ListTile(
title: Text('Horse'),
),
ListTile(
title: Text('Cow'),
),
ListTile(
title: Text('Camel'),
),
ListTile(
title: Text('Sheep'),
),
ListTile(
title: Text('Goat'),
),
]
).toList(),
)
最正确的方法是使用ListView.separated
ListView.separated(
itemCount: 25,
separatorBuilder: (BuildContext context, int index) => Divider(height: 1),
itemBuilder: (BuildContext context, int index) {
return ListTile(
title: Text('item $index'),
);
},
);
做同样的事情有很多方法。让我在这里比较一下
查看一个简短的静态列表
使用listile.divideTiles
ListView(
children: ListTile.divideTiles( // <-- ListTile.divideTiles
context: context,
tiles: [
ListTile(
title: Text('Horse'),
),
ListTile(
title: Text('Cow'),
),
ListTile(
title: Text('Camel'),
),
ListTile(
title: Text('Sheep'),
),
ListTile(
title: Text('Goat'),
),
]
).toList(),
)
这将为每个项目返回两个小部件,最后一个项目除外。separatorBuilder
用于添加分隔符
用于在最后一项后添加分隔符
创建使用分隔符或框装饰的自定义项小部件
使用分隔器
final items=[“马”、“牛”、“骆驼”、“羊”、“山羊”];
@凌驾
小部件构建(构建上下文){
返回ListView.builder(
itemCount:items.length,
itemBuilder:(上下文,索引){
返回列(
儿童:[
列表砖(
标题:文本(项目[索引]),
),
除法器(),//以下仅添加除法器():
列(
儿童:[
容器(
填充:所有边缘设置(16.0),
子:列(
儿童:[
Image.network(视频[“imageUrl”]),
容器(
身高:6.0,
ListView.separated(
itemCount: 100,
itemBuilder: (context, index) {
return ListTile(
title: Text('$index sheep'),
);
},
separatorBuilder: (context, index) {
return Divider();
},
)
final items = ['Horse', 'Cow', 'Camel', 'Sheep', 'Goat'];
@override
Widget build(BuildContext context) {
return ListView.builder(
itemCount: items.length,
itemBuilder: (context, index) {
return Column(
children: <Widget>[
ListTile(
title: Text(items[index]),
),
Divider(), // <-- Divider
],
);
},
);
}
final items = ['Horse', 'Cow', 'Camel', 'Sheep', 'Goat'];
@override
Widget build(BuildContext context) {
return ListView.builder(
itemCount: items.length,
itemBuilder: (context, index) {
return Container(
decoration: BoxDecoration( // <-- BoxDecoration
border: Border(bottom: BorderSide()),
),
child: ListTile(
title: Text(items[index]),
),
);
},
);
}
final items = ['Horse', 'Cow', 'Camel', 'Sheep', 'Goat'];
@override
Widget build(BuildContext context) {
return ListView.builder(
itemCount: items.length,
itemBuilder: (context, index) {
return Card( // <-- Card
child: ListTile(
title: Text(items[index]),
),
);
},
);
}
Column(
children: <Widget>[
Container(
padding: EdgeInsets.all(16.0),
child: Column(
children: <Widget>[
Image.network(video["imageUrl"]),
Container(
height: 6.0,
),
Text(
video["name"],
textScaleFactor: 1.05,
style: TextStyle(fontWeight: FontWeight.bold),
),
],
),
),
Divider(
color: Theme.of(context).primaryColor,
)
],
);
ListTile(
leading: Icon(Icons.home),
title: Text('Home'),
),
Container(height: 1, color: Colors.grey), //divider
ListTile(
leading: Icon(Icons.logout),
title: Text('Logout'),
),
Column(
children: [
for(var i=0; i<4; i+=1)
...[Container(height: 100, width: 100),
Divider()
]])
Container(height: 1, color: Colors.grey),
ListView.builder(
itemCount: _feed.items.length,
itemBuilder: (BuildContext context, int index) {
final item = _feed.items[index];
return Column(
children: <Widget>[
Container(height: 1, color: Colors.grey), //Container for devider
ListTile( //Your tile item
title: title(item.title),
subtitle: subtitle(item.pubDate),
leading: thumbnail(item.enclosure.url),
trailing: rightIcon(),
contentPadding: EdgeInsets.all(5.0),
onTap: () => openFeed(item.link),
)]);
},
);
Column(
children: <Widget>[
row, // A custom Row
Padding(
padding: const EdgeInsets.only(
left: 16, // Adjust separator left padding.
right: 16, // Adjust separator right padding.
),
child: Container(
height: 1,
color: Styles.productRowDivider, // Custom style
),
),
],
);
ListView.separated(
itemCount: 100,
itemBuilder: (context, index) {
return row;
},
separatorBuilder: (context, index) {
return Container(
height: 1,
color: Styles.productRowDivider, // Custom style
);
},
);