How To Make Thumbnail Tap Image Using Flutter Android App

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(
      debugShowCheckedModeBanner: false,
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool _isImageShown = false;
  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        backgroundColor: Colors.blue[700],
        title: Text('Thumbnail Tap Image'),
      ),
      body: Stack(
        children: <Widget>[
          !_isImageShown
              ? Center(
            child: GestureDetector(
              onTap: () => setState(() => _isImageShown = !_isImageShown),
              child: new Image.network(
                'https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQ0JhaimSD1ayvA9vffVRcueFMd8MqD5cJH9A&usqp=CAU',
                width: 90,
                height: 150,
                fit: BoxFit.cover,
              ),
            ),
          )
              : SizedBox(),
          _isImageShown
              ? Center(
            child: new Image.network(
              'https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQ0JhaimSD1ayvA9vffVRcueFMd8MqD5cJH9A&usqp=CAU',
              width: size.width,
              height: size.height,
              fit: BoxFit.fill,
            ),
          )
              : SizedBox(),
        ],
      ),
    );
  }
}