Code pubspec.yaml flutter: # The following line ensures that the Material Icons font is # included with your application, so that you can use the icons in # the material Icons class. uses-material-design: true assets: - images/pic1.jpg - images/pic2.jpg - images/pic3.jpg lib/main.dart import 'package:flutter/material.dart'; import 'package:flutter/rendering.dart' show debugPaintSizeEnabled; void main() { debugPaintSizeEnabled = false; // […]