GridView Sample from the documentation.

gridview_sample.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: GridView.count(
          primary: false,
          padding: const EdgeInsets.all(20),
          crossAxisSpacing: 10,
          mainAxisSpacing: 10,
          crossAxisCount: 2,
          children: <Widget>[
            Container(
              padding: const EdgeInsets.all(8),
              child: const Text('He\'d have you all unravel at the'),
              color: Colors.teal[100],
            ),
            Container(
              padding: const EdgeInsets.all(8),
              child: const Text('Heed not the rabble'),
              color: Colors.teal[200],
            ),
            Container(
              padding: const EdgeInsets.all(8),
              child: const Text('Sound of screams but the'),
              color: Colors.teal[300],
            ),
            Container(
              padding: const EdgeInsets.all(8),
              child: const Text('Who scream'),
              color: Colors.teal[400],
            ),
            Container(
              padding: const EdgeInsets.all(8),
              child: const Text('Revolution is coming...'),
              color: Colors.teal[500],
            ),
            Container(
              padding: const EdgeInsets.all(8),
              child: const Text('Revolution, they...'),
              color: Colors.teal[600],
            ),
          ],
        )
      ),
    );
  }
}