How it works...

You will now add firebase_analytics to your app and activate a custom event:

1. In the dependencies section of your project's pubspec.yaml file, add the firebase_analytics package:

firebase_analytics: ^8.0.1

2. In the lib folder of your project, create a new file, called happy_screen.dart.
3. At the top of the new file, import material.dart and firebase_analytics:

import 'package:flutter/material.dart';
import 'package:firebase_analytics/firebase_analytics.dart';

4. Under the import statements, create a new stateful widget, calling it HappyScreen:

class HappyScreen extends StatefulWidget {
  @override
  _HappyScreenState createState() => _HappyScreenState();
}

class _HappyScreenState extends State<HappyScreen> {
  @override
  Widget build(BuildContext context) {
    return Container();
  }
}

5. In the build method of the _HappyScreenState class, return Scaffold, with an appBar and a body. body contains a Center widget, and its child is ...