我添加了一个条件块，当权限状态返回为拒绝时，RequestPermissionPage小部件将在其中显示。它显示了RequestPermissionPage小部件，请求权限的按钮也按预期工作，但在给予权限后，主页仍然无法正常显示。
我正在对provider使用permission_handler。下面是我的代码：

class _HomeState extends State<Home> {
  final AppPermissionState _perm = AppPermissionState();
  final List<Widget> _pages = [const HomePage(), RecentPage(), StoragePage()];
  @override
  void initState() {
    super.initState();
    _perm.checkPermissionStatus();
  }

  int _selectedIndex = 0;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: _perm.permissionStatus.isGranted
          ? _pages.elementAt(_selectedIndex) //this doesn't show after requesting
          : const RequestPermissionPage(), //this works as intended
      bottomNavigationBar: NavigationBar(
        destinations: const [
          NavigationDestination(
              icon: Icon(Icons.folder_open), label: "Library"),
          NavigationDestination(
              icon: Icon(Icons.timelapse_rounded), label: "Recent"),
          NavigationDestination(
              icon: Icon(Icons.storage_outlined), label: "Storage"),
        ],
        selectedIndex: _selectedIndex,
        labelBehavior: NavigationDestinationLabelBehavior.onlyShowSelected,
        onDestinationSelected: (value) {
          setState(() {
            _selectedIndex = value;
          });
        },
      ),
    );
  }
}

class RequestPermissionPage extends StatelessWidget {
  const RequestPermissionPage({super.key});

  @override
  Widget build(BuildContext context) {
    return Consumer<AppPermissionState>(
      builder: (context, permissionStateValue, child) {
        return Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              const Padding(
                padding: EdgeInsets.all(16.0),
                child: Text("This feature require storage permission"),
              ),
              FilledButton.tonal(
                onPressed: () {
                  permissionStateValue.requestPermission(); //this works as intended too
                },
                child: const Text("Grant Permission"),
              )
            ],
          ),
        );
      },
    );
  }
}

权限提供者：

class AppPermissionState extends ChangeNotifier {
  PermissionStatus _permissionStatus = PermissionStatus.denied;

  PermissionStatus get permissionStatus => _permissionStatus;

  Future<void> requestPermission() async {
    _permissionStatus = await Permission.manageExternalStorage.request();
    notifyListeners();
  }

  Future<void> checkPermissionStatus() async {
    _permissionStatus = await Permission.manageExternalStorage.status;
  }
}

在Android Q、S和T上测试
AndroidManifest.xml中已提及的权限

<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" tools:ignore="ScopedStorage" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

已尝试将AppPermissionState中的checkPermissionStatus（）更改为以下代码

Future<void> checkPermissionStatus() async {
    await requestPermission();
    _permissionStatus = await Permission.manageExternalStorage.status;
    notifyListeners();
  }

应在授予权限后立即仅显示_pages.elementAt（_selectedIndex）中的内容，而不重新启动应用程序。
但即使在授予权限后仍显示RequestPermissionPage，奇怪的是，在重新启动应用程序后，我可以切换_pages中的元素，而RequestPermissionPage在更改底部导航栏页面后不显示，但每次打开应用程序时都会显示RequestPermissionPage。我该怎么解决？