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效果图：

 

 实现代码：

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter Row'),
        ),
        body: GridView.count(
          crossAxisCount: 3,
          children: <Widget>[
            Container(
              child: Text('第一块'),
              color: Colors.red,
            ),
            Text('第二块'),
            Text('第三块'),
          ],
        )
      ),
    );
  }
}