创建一个 Grid List

在某些情况下,您可能希望将item显示为网格,而不是一个普通列表。对于这需求,我们可以使用GridView Widget。

使用网格的最简单方法是使用GridView.count构造函数,它允许我们指定行数或列数。

在这个例子中,我们将生成一个包含100个widget的list,在网格中显示它们的索引。这将帮助我们观察GridView如何工作。

new GridView.count(
  // Create a grid with 2 columns. If you change the scrollDirection to 
  // horizontal, this would produce 2 rows.
  crossAxisCount: 2,
  // Generate 100 Widgets that display their index in the List
  children: new List.generate(100, (index) {
    return new Center(
      child: new Text(
        'Item $index',
        style: Theme.of(context).textTheme.headline,
      ),
    );
  }),
);

完整的例子

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final title = 'Grid List';

    return new MaterialApp(
      title: title,
      home: new Scaffold(
        appBar: new AppBar(
          title: new Text(title),
        ),
        body: new GridView.count(
          // Create a grid with 2 columns. If you change the scrollDirection to
          // horizontal, this would produce 2 rows.
          crossAxisCount: 2,
          // Generate 100 Widgets that display their index in the List
          children: new List.generate(100, (index) {
            return new Center(
              child: new Text(
                'Item $index',
                style: Theme.of(context).textTheme.headline,
              ),
            );
          }),
        ),
      ),
    );
  }
}