[英]How to do a GridView with two crossAxisCount in Flutter?
This is the example of expected output 这是预期输出的示例
For the first row, the crossAxisCount will be 3 and the second row, the crossAxisCount will be 2.对于第一行,crossAxisCount 将为 3,第二行,crossAxisCount 将为 2。
GridView.builder(
physics: NeverScrollableScrollPhysics(),
gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 3,
childAspectRatio: 0.75,
mainAxisSpacing: 2.0,
crossAxisSpacing: 1.0,
),
itemCount: int.parse(snapshot.data.result[num].collected),
itemBuilder:
(BuildContext context, int i) {
return Image.asset(
'assets/coin.png');
}),
You can set crossAxisCount
to 1
and childAspectRatio
to number you need, I use 2您可以将
crossAxisCount
设置为1
并将childAspectRatio
设置为您需要的数字,我使用 2
In itemBuilder
check index is Odd
and return Row
with 2 or 3 asset icon在
itemBuilder
检查索引是Odd
和返回Row
具有2个或3资产图标
You can copy paste run full code below您可以在下面复制粘贴运行完整代码
code snippet代码片段
GridView.builder(
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 1, childAspectRatio: 2),
itemCount: _icons.length,
itemBuilder: (context, index) {
if (index.isOdd) {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
child: Image.asset('assets/coin.png'),
),
Container(
child: Image.asset('assets/coin.png'),
),
Container(
child: Image.asset('assets/coin.png'),
),
],
);
} else {
working demo工作演示
full code完整代码
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@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> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Expanded(flex: 1, child: InfiniteGridView()),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
class InfiniteGridView extends StatefulWidget {
@override
_InfiniteGridViewState createState() => new _InfiniteGridViewState();
}
class _InfiniteGridViewState extends State<InfiniteGridView> {
List<IconData> _icons = [];
@override
void initState() {
_retrieveIcons();
}
@override
Widget build(BuildContext context) {
return GridView.builder(
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 1, childAspectRatio: 2),
itemCount: _icons.length,
itemBuilder: (context, index) {
if (index.isOdd) {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
child: Image.asset('assets/coin.png'),
),
Container(
child: Image.asset('assets/coin.png'),
),
Container(
child: Image.asset('assets/coin.png'),
),
],
);
} else {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
child: Image.asset('assets/coin.png'),
),
Container(
child: Image.asset('assets/coin.png'),
),
],
);
}
});
}
void _retrieveIcons() {
Future.delayed(Duration(milliseconds: 200)).then((e) {
setState(() {
_icons.addAll([
Icons.ac_unit,
Icons.airport_shuttle,
Icons.all_inclusive,
Icons.beach_access,
Icons.cake,
Icons.free_breakfast
]);
});
});
}
}
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