update permission flow

lib/pages/permission/permission.dart

@@ -112,8 +112,9 @@ class _PermissionHandlerScreenState extends State<PermissionHandlerScreen> {
 
   requestPermission() async {
   PermissionStatus permission = await Permission.location.status;
-
-  if (permission != PermissionStatus.granted) {
+  if(permission == PermissionStatus.permanentlyDenied){
+     showPermanentAlert(context);
+  }else{
     PermissionStatus newPermission = await Permission.location.request();
     //showAlert(context);
 
@@ -125,6 +126,10 @@ class _PermissionHandlerScreenState extends State<PermissionHandlerScreen> {
       Get.toNamed(AppPages.TRAVEL);
     }
   }
+
+  // if (permission != PermissionStatus.granted) {
+    
+  // }
   // If permission is granted or already was granted
   return true;
 }
@@ -138,6 +143,9 @@ class _PermissionHandlerScreenState extends State<PermissionHandlerScreen> {
         showAlert(context);
         //requestPermission() ? Get.toNamed(AppPages.TRAVEL) : exit(0);
         //Future.delayed(Duration.zero, () => showAlert(context));
+      }
+      else if(value.isPermanentlyDenied){
+        
       }
       else {
          Get.toNamed(AppPages.TRAVEL);
@@ -150,6 +158,33 @@ class _PermissionHandlerScreenState extends State<PermissionHandlerScreen> {
       );
   }
 
+  void showPermanentAlert(BuildContext context) {
+      showDialog(
+      context: context,
+      builder: (_) => AlertDialog(
+          title: const Text('無効'),
+          content: SingleChildScrollView(
+            child: ListBody(
+              children: const <Widget>[
+                Text( '位置情報が無効になっています'),
+                Text('このアプリケーションへの位置情報アクセスが無効になっています。続行するには設定>プライバシーとセキュリティ>位置情報サービス>岐阜ナビ で有効にしてください。'),
+              ],
+            ),
+          ),
+          actions: <Widget>[
+            ElevatedButton(
+              child: const Text('OK'),
+              onPressed: () {
+              //requestPermission();
+              permissionServiceCall();
+            },
+            ),
+          ],
+        )
+    );
+  }
+
+
   void showAlert(BuildContext context) {
       showDialog(
       context: context,