import 'package:flutter/material.dart';

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

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

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: ListView.builder(
        itemBuilder: (c, i) {
          return _buildItem(i);
        },
        itemCount: 7,
      ),
    );
  }

  Widget _buildItem(int i) {
    switch (i) {
      case 0:
        return AspectRatio(
          aspectRatio: 872 / 370,
          child: Text(
            i.toString(),
            textAlign: TextAlign.center,
          ),
        );
        break;
      case 1:
        return GridView.builder(
          gridDelegate:
              SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 4, childAspectRatio: 1 / 1),
          itemBuilder: (c, i) {
            return Text(
              i.toString(),
              textAlign: TextAlign.center,
            );
          },
          itemCount: 4,
          shrinkWrap: true,
          physics: NeverScrollableScrollPhysics(),
        );
        break;
      default:
        return GridView.builder(
          gridDelegate:
              SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2, childAspectRatio: 6 / 5),
          itemBuilder: (c, i) {
            return Text(
              i.toString(),
              textAlign: TextAlign.center,
            );
          },
          itemCount: 4,
          shrinkWrap: true,
          physics: NeverScrollableScrollPhysics(),
        );
    }
  }
}