GridView Flutter

import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';

class GridviewTest extends StatefulWidget {
  @override
  _GridviewTestState createState() => _GridviewTestState();
}

class _GridviewTestState extends State<GridviewTest> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: GridView.extent(
        maxCrossAxisExtent: 150.0,
        padding: EdgeInsets.all(8.0),
        children: List.generate(70, (index) {
          print('_buildGridview $index');
          return Card(
            margin: EdgeInsets.all(8.0),
            child: InkWell(
                child: Column(children: <Widget>[
              Icon(
                Icons.flight,
                size: 48.0,
                color: Colors.blue,
              ),
              Divider(),
              Text(
                'Index $index',
                textAlign: TextAlign.center,
                style: TextStyle(fontSize: 16.0),
              )
            ])),
          );
        }),
      ),
    );
  }
}