fix(rudder_sdk_flutter_example): fixed the issue of automatic screen …

…events being sent before SDK initialization

packages/example/lib/home_screen.dart

@@ -8,6 +8,8 @@ import 'package:rudder_integration_firebase_flutter/rudder_integration_firebase_
 // ignore: depend_on_referenced_packages
 import 'package:rudder_sdk_flutter_platform_interface/platform.dart';
 
+bool isInitialized = false;
+
 class HomeScreen extends StatefulWidget {
   const HomeScreen({Key? key}) : super(key: key);
 
@@ -42,6 +44,7 @@ class HomeScreenState extends State<HomeScreen> {
     builder.withLogLevel(RudderLogger.VERBOSE);
     String writeKey = dotenv.env['WRITE_KEY'] ?? "INVALID_WRITE_KEY";
     rudderClient.initialize(writeKey, config: builder.build(), options: null);
+    isInitialized = true;
 
     setOutput("initialize:\nwriteKey: $writeKey");
   }

packages/example/lib/my_route_observer.dart

@@ -1,20 +1,25 @@
 import 'package:flutter/material.dart';
 import 'package:rudder_sdk_flutter/RudderController.dart';
+import 'home_screen.dart';
 
 class MyRouteObserver extends RouteObserver<PageRoute<dynamic>> {
   @override
   void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
     super.didPush(route, previousRoute);
     if (route is PageRoute && route.settings.name != null) {
-      RudderController.instance.screen(route.settings.name!);
+      if (isInitialized) {
+        RudderController.instance.screen(route.settings.name!);
+      }
     }
   }
 
   @override
   void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
     super.didPop(route, previousRoute);
     if (previousRoute is PageRoute && route is PageRoute) {
-      RudderController.instance.screen(previousRoute.settings.name!);
+      if (isInitialized) {
+        RudderController.instance.screen(previousRoute.settings.name!);
+      }
     }
   }
 }