InkWell ripple over Image

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    title: 'Flutter Demo',
    debugShowCheckedModeBanner: false,
    theme: ThemeData(
      primarySwatch: Colors.blue,
    ),
    home: HomePage(),
  ));
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home Page'),
      ),
      body: Center(
        child: Stack(
          children: <Widget>[
            Image.network('https://flutter.dev/images/flutter-logo-sharing.png'),
            Positioned.fill(
              child: Material(
                color: Colors.transparent,
                child: InkWell(
                  onTap: () {
                    print('Sure');
                  },
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Originally published for: https://stackoverflow.com/questions/48066321/inkwell-ripple-over-top-of-image-in-gridtile-in-flutter/59317162#59317162