GridView.builder constructor example

GridViewBuilder.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.builder(
        primary: false,
        padding: const EdgeInsets.all(20),
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisSpacing: 10, mainAxisSpacing: 10, crossAxisCount: 2),
        itemCount: 6,
        itemBuilder: (BuildContext context, int index) {
          Widget widget;
          switch (index) {
            case 0:
              widget = Container(
                padding: const EdgeInsets.all(8),
                child: const Text('He\'d have you all unravel at the'),
                color: Colors.teal[100],
              );
              break;
            case 1:
              widget = Container(
                padding: const EdgeInsets.all(8),
                child: const Text('Heed not the rabble'),
                color: Colors.teal[200],
              );
              break;
            case 2:
              widget = Container(
                padding: const EdgeInsets.all(8),
                child: const Text('Sound of screams but the'),
                color: Colors.teal[300],
              );
              break;
            case 3:
              widget = Container(
                padding: const EdgeInsets.all(8),
                child: const Text('Who scream'),
                color: Colors.teal[400],
              );
              break;
            case 4:
              widget = Container(
                padding: const EdgeInsets.all(8),
                child: const Text('Revolution is coming...'),
                color: Colors.teal[500],
              );
              break;
            default:
              widget = Container(
                padding: const EdgeInsets.all(8),
                child: const Text('Revolution, they...'),
                color: Colors.teal[600],
              );
          }
          return widget;
        },
      )),
    );
  }
}