如何在Flutter中创建GridView布局

Question

我正在尝试在 flutter 中布局 4x4 的图块网格。我设法用列和行来做到这一点。但现在我找到了

GridView

组件。谁能提供一个如何使用它的例子吗？

我无法真正理解这些文档。我似乎没有得到我想要的结果。

Answer 1

使用适合您需要的选项。

GridView.count(...)

GridView.count(
  crossAxisCount: 2,
  children: <Widget>[
    FlutterLogo(),
    FlutterLogo(),
    FlutterLogo(),
    FlutterLogo(),
  ],
)

GridView.builder(...)

GridView.builder(
  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
  itemBuilder: (_, index) => FlutterLogo(),
  itemCount: 4,
)

GridView(...)

GridView(
  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
  children: <Widget>[
    FlutterLogo(),
    FlutterLogo(),
    FlutterLogo(),
    FlutterLogo(),
  ],
)

GridView.custom(...)

GridView.custom(
  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
  childrenDelegate: SliverChildListDelegate(
    [
      FlutterLogo(),
      FlutterLogo(),
      FlutterLogo(),
      FlutterLogo(),
    ],
  ),
)

GridView.extent(...)

GridView.extent(
  maxCrossAxisExtent: 400,
  children: <Widget>[
    FlutterLogo(),
    FlutterLogo(),
    FlutterLogo(),
    FlutterLogo(),
  ],
)

输出（全部相同）：

Answer 2

将图像加载到图块中的简单示例。

import 'package:flutter/material.dart';

void main() {
  runApp( MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(

      color: Colors.white30,
      child: GridView.count(
          crossAxisCount: 4,
          childAspectRatio: 1.0,
          padding: const EdgeInsets.all(4.0),
          mainAxisSpacing: 4.0,
          crossAxisSpacing: 4.0,
          children: <String>[
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
            'http://www.for-example.org/img/main/forexamplelogo.png',
          ].map((String url) {
            return GridTile(
                child: Image.network(url, fit: BoxFit.cover));
          }).toList()),
    );
  }
}

Flutter Gallery 应用程序包含一个真实世界的示例，可以在此处找到。

Answer 3

GridView

用于实现材料网格列表。如果您知道自己有固定数量的物品，而且数量不是很多（16 个就可以了），您可以使用

GridView.count

。但是，您应该注意，

GridView

是可滚动的，如果这不是您想要的，那么您最好只使用行和列。

import 'dart:collection';
import 'package:flutter/scheduler.dart';
import 'package:flutter/material.dart';
import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/foundation.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.orange,
      ),
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget{
  @override
  Widget build(BuildContext context){
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Grid Demo'),
      ),
      body: new GridView.count(
        crossAxisCount: 4,
        children: new List<Widget>.generate(16, (index) {
          return new GridTile(
            child: new Card(
              color: Colors.blue.shade200,
              child: new Center(
                child: new Text('tile $index'),
              )
            ),
          );
        }),
      ),
    );
  }
}

Answer 4

请访问此repo。

Widget _gridView() {
    return GridView.count(
      crossAxisCount: 4,
      padding: EdgeInsets.all(4.0),
      childAspectRatio: 8.0 / 9.0,
      children: itemList
          .map(
            (Item) => ItemList(item: Item),
          )
          .toList(),
    );
  }

下面的屏幕截图包含 crossAxisCount: 2

Answer 5

GridView

中很少有针对不同场景的命名构造函数，

构造函数

```
GridView
```
```
GridView.builder
```
```
GridView.count
```
```
GridView.custom
```
```
GridView.extent
```

下面是

GridView

构造函数的示例：

import 'package:flutter/material.dart';

void main() => runApp(
  MaterialApp(
    home: ExampleGrid(),
  ),
);

class ExampleGrid extends StatelessWidget {
  List<String> images = [
    "https://uae.microless.com/cdn/no_image.jpg",
    "https://images-na.ssl-images-amazon.com/images/I/81aF3Ob-2KL._UX679_.jpg",
    "https://www.boostmobile.com/content/dam/boostmobile/en/products/phones/apple/iphone-7/silver/device-front.png.transform/pdpCarousel/image.jpg",
    "https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSgUgs8_kmuhScsx-J01d8fA1mhlCR5-1jyvMYxqCB8h3LCqcgl9Q",
    "https://ae01.alicdn.com/kf/HTB11tA5aiAKL1JjSZFoq6ygCFXaw/Unlocked-Samsung-GALAXY-S2-I9100-Mobile-Phone-Android-Wi-Fi-GPS-8-0MP-camera-Core-4.jpg_640x640.jpg",
    "https://media.ed.edmunds-media.com/gmc/sierra-3500hd/2018/td/2018_gmc_sierra-3500hd_f34_td_411183_1600.jpg",
    "https://hips.hearstapps.com/amv-prod-cad-assets.s3.amazonaws.com/images/16q1/665019/2016-chevrolet-silverado-2500hd-high-country-diesel-test-review-car-and-driver-photo-665520-s-original.jpg",
    "https://www.galeanasvandykedodge.net/assets/stock/ColorMatched_01/White/640/cc_2018DOV170002_01_640/cc_2018DOV170002_01_640_PSC.jpg",
    "https://media.onthemarket.com/properties/6191869/797156548/composite.jpg",
    "https://media.onthemarket.com/properties/6191840/797152761/composite.jpg",
  ];
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: GridView(
        physics: BouncingScrollPhysics(), // if you want IOS bouncing effect, otherwise remove this line
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),//change the number as you want
        children: images.map((url) {
          return Card(child: Image.network(url));
        }).toList(),
      ),
    );
  }
}

如果您希望 GridView 项目根据内容动态变化，您只需几行即可完成，但最简单的方法是使用

StaggeredGridView

包。我已经通过示例提供了答案here。

以下是

GridView.count

的示例：

import 'package:flutter/material.dart';

void main() => runApp(
      MaterialApp(
        home: ExampleGrid(),
      ),
    );

class ExampleGrid extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: GridView.count(
        crossAxisCount: 4,
        children: List.generate(40, (index) {
          return Card(
            child: Image.network("https://robohash.org/$index"),
          ); //robohash.org api provide you different images for any number you are giving
        }),
      ),
    );
  }
}

以上代码片段的屏幕截图：

SliverGridView

的示例：

import 'package:flutter/material.dart';

void main() => runApp(
      MaterialApp(
        home: ExampleGrid(),
      ),
    );

class ExampleGrid extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: CustomScrollView(
        primary: false,
        slivers: <Widget>[
          SliverPadding(
            padding: const EdgeInsets.all(20.0),
            sliver: SliverGrid.count(
              crossAxisSpacing: 10.0,
              crossAxisCount: 2,
              children: List.generate(20, (index) {
                return Card(child: Image.network("https://robohash.org/$index"));
              }),
            ),
          ),
        ],
      )
    );
  }
}

Answer 6

有 4 种不同类型的 GridView :

GridView.count()
GridView.builder()
GridView.custom()
GridView.extent()

GridView.count(crossAxisCount: 2, 子级： imageUrls.map((imageUrl) => Image.network(imageUrl)).toList()),

以下链接给出了详细的代码示例： https://www.codecappuccino.com/post/flutter-gridview

如何在Flutter中创建GridView布局

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如何在Flutter中创建GridView布局

问题描述 投票：0回答：6

6个回答

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问题描述投票：0回答：6