Example of using the whats new custom widget for flutter.

startpage.dart

import 'package:flutter/material.dart';
import 'package:Unify_Mobile/globals.dart' as globals;
import 'package:Unify_Mobile/custom/whatsnew.dart';

class StartPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    List<WhatsNewItem> _items = [
      WhatsNewItem(
        title: Text('Dart Theme'),
        subtitle: Text('Black and grey theme'),
        leading: Icon(Icons.color_lens),
        onPressed: () {
          Navigator.of(context).popAndPushNamed("/settings");
        },
      ),
      WhatsNewItem(
        title: Text('Quick Send'),
        subtitle: Text('Step by step guide for sending emails'),
        leading: Icon(Icons.send),
        onPressed: () {
          Navigator.of(context).popAndPushNamed("/settings");
        },
      ),
      WhatsNewItem(
        title: Text('Video List Layout'),
        subtitle: Text('Choose between a Grid layout and List layout'),
        leading: Icon(Icons.grid_on),
        onPressed: () {
          Navigator.of(context).popAndPushNamed("/settings");
        },
      ),
      WhatsNewItem(
        title: Text('Thumbnail Management'),
        subtitle:
            Text('Edit and view the current video for any editable email'),
        leading: Icon(Icons.color_lens),
        onPressed: () {
          globals.Utility.showAlertPopup(context, "Info",
              "Select a video, go to the video details (bottom right icon), scroll down to the thumbnail tile.");
        },
      ),
    ];

    return new Scaffold(
      body: SafeArea(
        child: WhatsNewPage(
          title: Text(
            "What's New",
            textAlign: TextAlign.center,
            style: TextStyle(
              fontSize: 22.0,
              fontWeight: FontWeight.bold,
            ),
          ),
          buttonText: Text('Continue'),
          items: _items,
          onPressed: () {
            Navigator.of(context).popAndPushNamed("/menu");
          },
        ),
      ),
    );
  }
}