use many pub in different page

covas_mobile/lib/main.dart

@@ -1,9 +1,9 @@
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:http/http.dart' as http;
-import 'classes/ad_helper.dart';
 import 'dart:convert';
-import 'package:flutter_dotenv/flutter_dotenv.dart';
+
+import 'classes/ad_helper.dart';
 import 'package:google_mobile_ads/google_mobile_ads.dart';
 
 import 'dart:io';
@@ -39,6 +39,7 @@ class LoginDemo extends StatefulWidget {
 }
 
 class _LoginDemoState extends State<LoginDemo> with ShowAlertDialog {
+  BannerAd? _bannerAd;
   TextEditingController inputPseudo = TextEditingController();
   TextEditingController inputPassword = TextEditingController();
   Future<void> _login(BuildContext context) async {
@@ -134,18 +135,16 @@ class _LoginDemoState extends State<LoginDemo> with ShowAlertDialog {
   @override
   void initState() {
     super.initState();
-    AdHelper.loadBannerAd(setState);
+    AdHelper.createBannerAd(() => setState(() {})).then((ad) {
+      setState(() {
+        _bannerAd = ad;
+      });
+    });
 
     _checkLocationPermission();
     start();
   }
 
-  @override
-  void dispose() {
-    AdHelper.disposeAd(); // Dispose of ad when the widget is removed
-    super.dispose();
-  }
-
   Future<void> _checkLocationPermission() async {
     PermissionStatus status = await Permission.location.status;
 
@@ -196,6 +195,13 @@ class _LoginDemoState extends State<LoginDemo> with ShowAlertDialog {
       body: SingleChildScrollView(
         child: Column(
           children: <Widget>[
+            _bannerAd == null
+                ? SizedBox.shrink()
+                : SizedBox(
+                    height: _bannerAd!.size.height.toDouble(),
+                    width: _bannerAd!.size.width.toDouble(),
+                    child: AdWidget(ad: _bannerAd!),
+                  ),
             Padding(
               padding: const EdgeInsets.only(top: 60.0),
               child: Center(
@@ -266,12 +272,6 @@ class _LoginDemoState extends State<LoginDemo> with ShowAlertDialog {
                   Navigator.push(
                       context, MaterialPageRoute(builder: (_) => AddProfile()));
                 }),
-            if (AdHelper.isBannerAdLoaded)
-              SizedBox(
-                height: AdHelper.bannerAd!.size.height.toDouble(),
-                width: AdHelper.bannerAd!.size.width.toDouble(),
-                child: AdWidget(ad: AdHelper.bannerAd!),
-              ),
           ],
         ),
       ),