_example_18.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _MyAppState();
  }
}

class _MyAppState extends State<MyApp> {
// Declare a set list of images to cycle through as a final
  final List<Image> _itemImages = [
    Image.asset('assets/Google.png'),
    Image.asset('assets/dtw.png'),
    Image.asset('assets/GDGDetroit.png')
  ];

  int _index = 0;
  List<Image> _listOfImagesForScreen = [];

  void onButtonPressed() {
    setState(() {
      _index++;
      if (_index >= _itemImages.length) {
        _index = 0;
      }
      _listOfImagesForScreen.add(_itemImages[_index]);
      // print('Item Name = ' + _listOfImagesForScreen.toString());
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Detroit Tech Watch',
        home: Scaffold(
            appBar: AppBar(
              title: Text('Detroit Tech Watch'),
            ),
            body: Stack(
              children: <Widget>[
                ListView(
                  children: _listOfImagesForScreen
                      .map((element) => Card(
                            margin: EdgeInsets.all(8),
                            child: Column(
                              children: <Widget>[
                                element,
                                Padding(
                                  padding: const EdgeInsets.all(8),
                                ),
                              ],
                            ),
                          ))
                      .toList(),
                ),
                Positioned(
                    bottom: 16.0,
                    right: 16.0,
                    child: FloatingActionButton(
                      child: const Icon(Icons.add),
                      onPressed: () {
                        onButtonPressed();
                      },
                    ))
              ],
            )));
  }
}