我希望通过Firebase分析在Flutter应用中跟踪选项卡更改。在示例应用程序中，它们只是将FirebaseAnalyticsObserver传递到小部件树下：

class MyApp extends StatelessWidget {
  static FirebaseAnalytics analytics = FirebaseAnalytics();
  static FirebaseAnalyticsObserver observer =
      FirebaseAnalyticsObserver(analytics: analytics);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Firebase Analytics Demo',theme: ThemeData(
        primarySwatch: Colors.blue,),navigatorObservers: <NavigatorObserver>[observer],home: MyHomePage(
        title: 'Firebase Analytics Demo',analytics: analytics,observer: observer,);
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key,this.title,this.analytics,this.observer})
      : super(key: key);

  final String title;
  final FirebaseAnalytics analytics;
  final FirebaseAnalyticsObserver observer;

  @override
  _MyHomePageState createState() => _MyHomePageState(analytics,observer);
}

class _MyHomePageState extends State<MyHomePage> {
  _MyHomePageState(this.analytics,this.observer);

  final FirebaseAnalyticsObserver observer;
  final FirebaseAnalytics analytics;

但是问题是我的标签页位于小部件树的下方。因此很难一路走下去。

如何初始化FirebaseAnalytics观察器以跟踪正常的屏幕路线，但也可以将其提供给标签页？

我正在使用Provider和ChangeNotifier。所以也许我可以初始化一个服务，然后提供下来？例如

class Analytic extends ChangeNotifier {

static FirebaseAnalyticsObserver observer =
FirebaseAnalyticsObserver(analytics: analytics);
}