Android用のWebViewを追加。OSのブラウザは起動できないため。

ios/Podfile.lock

@@ -44,6 +44,8 @@ PODS:
     - FMDB (>= 2.7.5)
   - url_launcher_ios (0.0.1):
     - Flutter
+  - webview_flutter_wkwebview (0.0.1):
+    - Flutter
 
 DEPENDENCIES:
   - camera_avfoundation (from `.symlinks/plugins/camera_avfoundation/ios`)
@@ -64,6 +66,7 @@ DEPENDENCIES:
   - shared_preferences_foundation (from `.symlinks/plugins/shared_preferences_foundation/darwin`)
   - sqflite (from `.symlinks/plugins/sqflite/ios`)
   - url_launcher_ios (from `.symlinks/plugins/url_launcher_ios/ios`)
+  - webview_flutter_wkwebview (from `.symlinks/plugins/webview_flutter_wkwebview/ios`)
 
 SPEC REPOS:
   trunk:
@@ -108,6 +111,8 @@ EXTERNAL SOURCES:
     :path: ".symlinks/plugins/sqflite/ios"
   url_launcher_ios:
     :path: ".symlinks/plugins/url_launcher_ios/ios"
+  webview_flutter_wkwebview:
+    :path: ".symlinks/plugins/webview_flutter_wkwebview/ios"
 
 SPEC CHECKSUMS:
   camera_avfoundation: 759172d1a77ae7be0de08fc104cfb79738b8a59e
@@ -131,6 +136,7 @@ SPEC CHECKSUMS:
   shared_preferences_foundation: b4c3b4cddf1c21f02770737f147a3f5da9d39695
   sqflite: 50a33e1d72bd59ee092a519a35d107502757ebed
   url_launcher_ios: bbd758c6e7f9fd7b5b1d4cde34d2b95fcce5e812
+  webview_flutter_wkwebview: b7e70ef1ddded7e69c796c7390ee74180182971f
 
 PODFILE CHECKSUM: 7a34d5e980f9e05ecf4e24c79da64ca020615638
 

lib/pages/WebView/WebView_page.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+import 'package:webview_flutter/webview_flutter.dart';
+
+class WebViewPage extends StatelessWidget {
+  final String url;
+
+  const WebViewPage({Key? key, required this.url}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('WebView'),
+      ),
+      body: WebView(
+        initialUrl: url,
+        javascriptMode: JavascriptMode.unrestricted,
+      ),
+    );
+  }
+}

lib/pages/drawer/drawer_page.dart

@@ -6,6 +6,7 @@ import 'package:rogapp/routes/app_pages.dart';
 import 'package:rogapp/services/auth_service.dart';
 import 'package:rogapp/utils/database_helper.dart';
 import 'package:url_launcher/url_launcher.dart';
+import 'package:rogapp/pages/WebView/WebView_page.dart';
 
 // SafeAreaウィジェットを使用して、画面の安全領域内にメニューを表示しています。
 // Columnウィジェットを使用して、メニューアイテムを縦に並べています。
@@ -23,12 +24,26 @@ class DrawerPage extends StatelessWidget {
   }
   */
 
-  void _launchURL(String urlString) async {
+  void _launchURL(BuildContext context,String urlString) async {
+    try {
       Uri url = Uri.parse(urlString);
       if (await canLaunchUrl(url)) {
         await launchUrl(url);
       } else {
-      throw 'Could not launch $url';
+        // URLを開けない場合のフォールバック動作
+        // 例えば、WebViewを使用してアプリ内でURLを開く
+        Navigator.push(
+          context,
+          MaterialPageRoute(
+            builder: (context) => WebViewPage(url: urlString),
+          ),
+        );
+      }
+    }catch(e){
+      // エラーメッセージを表示する
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text('URLを開けませんでした: $e')),
+      );
     }
   }
 
@@ -242,7 +257,7 @@ class DrawerPage extends StatelessWidget {
                     leading: const Icon(Icons.featured_video),
                     title: Text("rog_web".tr),
                     onTap: () {
-                      _launchURL("https://www.gifuai.net/?page_id=60043");
+                      _launchURL(context, "https://www.gifuai.net/?page_id=60043");
                     },
                   )
                 : const SizedBox(
@@ -255,7 +270,7 @@ class DrawerPage extends StatelessWidget {
               leading: const Icon(Icons.privacy_tip),
               title: Text("privacy".tr),
               onTap: () {
-                _launchURL("https://rogaining.sumasen.net/api/privacy/");
+                _launchURL(context, "https://rogaining.sumasen.net/api/privacy/");
               },
             ),
             ListTile(

pubspec.lock

@@ -1389,6 +1389,38 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.5.1"
+  webview_flutter:
+    dependency: "direct main"
+    description:
+      name: webview_flutter
+      sha256: "392c1d83b70fe2495de3ea2c84531268d5b8de2de3f01086a53334d8b6030a88"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.4"
+  webview_flutter_android:
+    dependency: transitive
+    description:
+      name: webview_flutter_android
+      sha256: "8b3b2450e98876c70bfcead876d9390573b34b9418c19e28168b74f6cb252dbd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.10.4"
+  webview_flutter_platform_interface:
+    dependency: transitive
+    description:
+      name: webview_flutter_platform_interface
+      sha256: "812165e4e34ca677bdfbfa58c01e33b27fd03ab5fa75b70832d4b7d4ca1fa8cf"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.5"
+  webview_flutter_wkwebview:
+    dependency: transitive
+    description:
+      name: webview_flutter_wkwebview
+      sha256: a5364369c758892aa487cbf59ea41d9edd10f9d9baf06a94e80f1bd1b4c7bbc0
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.9.5"
   win32:
     dependency: transitive
     description:

pubspec.yaml

@@ -87,6 +87,7 @@ dependencies:
   flutter_riverpod: ^2.5.1
   http: ^1.1.0
   qr_code_scanner: ^1.0.1
+  webview_flutter: ^3.0.0
 
 flutter_icons:
   android: true