我试着用 Hive 内部Flutter Mobx ，在签入用户数据后 Hive 我切换到另一个屏幕，如 HomeView 或者
Intro main.dart :

Future<void> main() async {
  ...
  final appDocumentDirectory = await path_provider.getApplicationDocumentsDirectory();
  Hive.init(appDocumentDirectory.path);
  Hive.registerAdapter(UserAdapter());
  _setUpLogging();
  runApp(MultiProvider(providers: providers, child: StartupApplication()));
}
``` `StartupApplication` 班级：我不使用 `Hive` ```
class StartupApplication extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final isPlatformDark = WidgetsBinding.instance.window.platformBrightness == Brightness.dark;
    final initTheme = isPlatformDark ? nebrassLightTheme : nebrassLightTheme;
    return ThemeProvider(
      initTheme: initTheme,
      duration: const Duration(milliseconds: 400),
      child: Builder(builder: (context) {
        return MaterialApp(
          title: 'TEST',
          theme: ThemeProvider.of(context),
          home: const OverlaySupport(child: OKToast(
           child: MyHomePage() //--> checking user data widget
          )),
          onGenerateRoute: Routes.sailor.generator(),
          navigatorKey: Routes.sailor.navigatorKey,
        );
      }),
    );
  }
}

检查 User 在 Hive 内部 MyHomePage 班级：

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key key}) : super(key: key);
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
    class _MyHomePageState extends State<MyHomePage> {
      @override
      Widget build(BuildContext context) {
        return FutureBuilder<Box<User>>(
            future: Hive.openBox('user'),
            builder: (context, snapshot) {
              if (snapshot.connectionState == ConnectionState.done) {
                final Box<User> userBox = snapshot.data;
                if (userBox.values.isNotEmpty && userBox.get(0).active == 1) {
                  return HomeView();
                } else {
                  return Intro();
                }
              } else {
                return Container();
              }
            });
      }
      @override
      void dispose() {
        Hive.close();
        super.dispose();
      }
    }

现在在其他屏幕中，例如 RegisterScreen 一级实施 MobX 我想在里面 user 框，例如：

class Register extends StatefulWidget {
  @override
  _RegisterState createState() => _RegisterState();
}
class _RegisterState extends State<Register> {
  TextEditingController _mobileNumber;
  final GlobalKey<ScaffoldState> _scaffoldState = GlobalKey<ScaffoldState>();
  @override
  void initState() {
    super.initState();
    _mobileNumber = TextEditingController();
  }
  @override
  Widget build(BuildContext context) {
    final _registerViewModel = Provider.of<RegisterViewModel>(context, listen: false);
    return Directionality(
      textDirection: TextDirection.ltr,
      child: Scaffold(
        key: _scaffoldState,
        ...
        //_registerViewModel.registerAccount(_mobileNumber.text, '111');
      ),
    );
  }
  void _showSnackBar(String message, BuildContext context) {
    _scaffoldState.currentState.showSnackBar(SnackBar(
        content: Directionality(
            textDirection: TextDirection.rtl,
            child: Text(
              '$message',
              style: AppTheme.of(context).caption().copyWith(color: Colors.white),
            ))));
  }
}
``` `MobX` 实施：

enum RegisterLoadingState { loading, done }
enum ActiveLoadingState { loading, done }
enum RegisteringState { initial, registered, activated, registerError, activeError }

class RegisterViewModel = _RegisterViewModel with _$RegisterViewModel;

abstract class _RegisterViewModel with Store {
final WebApi _webApi;

_RegisterViewModel({@required WebApi webApi}) : _webApi = webApi;

...

@action
Future registerAccount(String mobileNumber, String deviceId) async {
final RegisterRequest _request = RegisterRequest(mobileNumber, deviceId);
try {
loadingState = RegisterLoadingState.loading;
final _res = await _webApi.register(_request);
loadingState = RegisterLoadingState.done;

  _registerResponse = RegisterResponse.fromJson(_res.body as Map<String, dynamic>);
  /* I GET ERROR IN THIS LINE -- HiveError: The box "user" is already open and of type Box<User>.*/
  final userBox = await Hive.openBox('user');
  final user = User(/*...*/);
  userBox.putAt(0, user);

}

@action
Future activeAccount(String mobileNumber, String verifyCode) async {
final ActiveAccountRequest _activeAccount = ActiveAccountRequest(mobileNumber, verifyCode);

final userBox = await Hive.openBox('user');
final User currentUser = userBox.getAt(0) as User;
final user = User(/*...*/);
userBox.putAt(0, user);

}
}