How make a grid image from json clickable

  1. Summary of my problem
    How can i make the image.network part clickable to fullscreen?
    body: GridView.builder(
    gridDelegate:
    SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
    itemCount: imagesUrl.length,
    itemBuilder: (BuildContext context, int index) {
    //IMAGE NETWORK
    return Image.network(
    imagesUrl[index],
    fit: BoxFit.cover,
    );
    onTap:
    () {};
    // ENDE IMAGE NETWORK
    },
    ),
    );

this is my full script

import ‘dart:convert’;
import ‘package:flutter/material.dart’;
import ‘nav_more.dart’;
import ‘package:full_screen_image/full_screen_image.dart’;
import ‘package:http/http.dart’ as http;

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

class MyAppGallery extends StatefulWidget {
@override
_MyAppGalleryState createState() => _MyAppGalleryState();
}

class _MyAppGalleryState extends State {
List data;
List imagesUrl = [];

@override
void initState() {
super.initState();
fetchDataFromApi();
}

Future fetchDataFromApi() async {
var jsonData =
await http.get(Uri.parse(‘https://www.xxxx.de/app/gallery.json’));
var fetchData = jsonDecode(jsonData.body);

setState(() {
  data = fetchData;
  data.forEach((element) {
    imagesUrl.add(element['url']);
  });
});

return "Success";

}

@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.grey[900],
// APPBAR
appBar: AppBar(
leading: Image.asset(
‘assets/images/logo.png’,
fit: BoxFit.contain,
height: 30,
),
title: Center(
child: Text(‘GALLERY’),
),
actions: [
IconButton(
icon: Icon(
Icons.menu,
color: Colors.white,
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => MyAppMore()),
);
},
)
],
backgroundColor: Colors.black87,
),
// APPBAR ENDE
body: GridView.builder(
gridDelegate:
SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
itemCount: imagesUrl.length,
itemBuilder: (BuildContext context, int index) {
//IMAGE NETWORK
return Image.network(
imagesUrl[index],
fit: BoxFit.cover,
);
onTap:
() {};
// ENDE IMAGE NETWORK
},
),
);
}
}