D/InputConnectionAdaptor（3218）：输入方法切换光标监视

Question

这是我在我的auth_screen.dart文件中使用的表单的一部分：该 file：

child: Obx(() => Form(
      key: _formKey,
      child: SingleChildScrollView(
        child: Column(
          children: <Widget>[
            TextFormField(
              decoration: const InputDecoration(labelText: 'E-Mail'),
              keyboardType: TextInputType.emailAddress,
              validator: (value) {
                if (value!.isEmpty || !value.contains('@')) {
                  return 'Invalid email!';
                }
              },
              onSaved: (value) {
                _authData['email'] = value as String;
              },
            ),
            TextFormField(
              decoration: const InputDecoration(labelText: 'Password'),
              obscureText: true,
              controller: _passwordController,
              validator: (value) {
                if (value!.isEmpty || value.length < 5) {
                  return 'Password is too short!';
                }
              },
              onSaved: (value) {
                _authData['password'] = value as String;
              },
            ),

它有两个textformfield用于电子邮件的密码。

另外，相关auth_controller.dart文件如下：

enum AuthMode { Signup, Login }

class AuthController extends GetxController
    with GetSingleTickerProviderStateMixin {
  static AuthController instance = Get.find();
  Rx<dynamic>? authMode = AuthMode.Login.obs;
  RxBool? isLoading = false.obs;
  String? _token;
  DateTime? _expiryDate;
  String? _userId;
  Timer? _authTimer;
  final _isAuth = false.obs;

  AnimationController? controller;
  Animation<Offset>? slideAnimation;
  Animation<double>? opacityAnimation;
  late TextEditingController passwordController;
  final key = GlobalKey<FormState>();

  @override
  void onInit() {
    super.onInit();
    tryAutoLogin();
    controller = AnimationController(
      vsync: this,
      duration: const Duration(
        milliseconds: 300,
      ),
    );
    slideAnimation = Tween<Offset>(
      begin: const Offset(0, -1.5),
      end: const Offset(0, 0),
    ).animate(
      CurvedAnimation(
        parent: controller as Animation<double>,
        curve: Curves.fastOutSlowIn,
      ),
    );
    opacityAnimation = Tween(begin: 0.0, end: 1.0).animate(
      CurvedAnimation(
        parent: controller as Animation<double>,
        curve: Curves.easeIn,
      ),
    );
    // _heightAnimation.addListener(() => setState(() {}));

    passwordController = TextEditingController();
  }

  @override
  void onClose() {
    super.onClose();
    passwordController.dispose();
  }

  bool get isAuth {
    _isAuth.value = token != null;
    return _isAuth.value;
  }

  String? get token {
    if (_expiryDate != null &&
        _expiryDate!.isAfter(DateTime.now()) &&
        _token != null) {
      return _token;
    }
    return null;
  }

  String? get userId {
    return _userId;
  }

  Future<void> _authenticate(
      String email, String password, String urlSegment) async {
    // print('app is here!!!5555');
    // const host = "localhost";
    final host = UniversalPlatform.isAndroid ? '10.0.2.2' : '127.0.0.1';
    final url = Uri.parse('http://$host:8000/api/$urlSegment');

    try {
      final http.Response response = await http.post(
        url,
        headers: {"Content-Type": "application/json"},
        body: json.encode(
          {
            'email': email,
            'password': password,

            //'returnSecureToken': true,
          },
        ),
      );
      // print('this is responsde ' );
      // print(response);

      final responseData = json.decode(response.body);
        print(responseData);

      if (responseData['error'] != null) {
        throw HttpException(responseData['error']['message']);
      } else {
        _token = responseData['idToken'];
        _userId = responseData['id'];
        _expiryDate = DateTime.now().add(
          Duration(
            milliseconds: responseData['expiresIn'],
          ),
        );
      }
      _autoLogout();
      // update();
      final prefs = await SharedPreferences.getInstance();
      final userData = json.encode(
        {
          'token': _token,
          'userId': _userId,
          'expiryDate': _expiryDate!.toIso8601String(),
        },
      );
      prefs.setString('userData', userData);
      isLoading?.value = false;

      // print(prefs.getString('userData'));
      Get.toNamed(rootRoute);
    } catch (error) {
      throw error;
    }
  }

  Future<void> signup(String email, String password) async {
    return _authenticate(email, password, 'signup');
  }

  Future<void> login(String email, String password) async {
    return _authenticate(email, password, 'sessions');
  }

  Future<bool> tryAutoLogin() async {
final prefs = await SharedPreferences.getInstance();
    if (!prefs.containsKey('userData')) {
      return false;
    }
    final Map<String, Object> extractedUserData = Map<String, Object>.from(
        json.decode(prefs.getString('userData') as String));
    final expiryDate =
        DateTime.parse(extractedUserData['expiryDate'] as String);

    if (expiryDate.isBefore(DateTime.now())) {
      return false;
    }
    _token = extractedUserData['token'] as String;
    _userId = extractedUserData['userId'] as String;
    _expiryDate = expiryDate;
     _isAuth.value = true;
    _autoLogout();
    return true;
  }

  Future<void> logout() async {
    _token = null;
    _userId = null;
    _expiryDate = null;
    if (_authTimer != null) {
      _authTimer!.cancel();
      _authTimer = null;
    }
    // update();
    final prefs = await SharedPreferences.getInstance();
    // prefs.remove('userData');
    prefs.clear();
    _isAuth.value = false;
  }

  void _autoLogout() {
    if (_authTimer != null) {
      _authTimer!.cancel();
    }
    final timeToExpiry = _expiryDate!.difference(DateTime.now()).inSeconds;
    _authTimer = Timer(Duration(seconds: timeToExpiry), logout);
  }
}

当我启动应用程序时，它似乎没有错误运行，但是当我单击textformfield s以输入电子邮件或密码，Android模拟器上的虚拟键盘将立即打开并关闭，并且不允许我输入任何内容。它还在调试控制台中显示以下消息：

d/inputConnectionAdaptor（3218）：输入方法切换光标 监视

Answer 1

经过如此多的努力，我发现而不是neceslesswidget请使用statefullwidget对此。
我希望它能帮助您！

Answer 2

就我而言，解决方案是将globalkey（）从build（）方法

关闭键盘中取出：

Form(key: GlobalKey<FormState>());

解决方案：

final _formKey = GlobalKey<FormState>();
Form(key: _formKey)

Answer 3

在textformfield上设置“ 键”属性为我解决了此问题。我在initstate方法中创建了密钥（尽管可以使用globalkey＆formfieldState＆gt;（）构造函数，但可以在其他位置创建它。

Answer 4

我面临着同样的问题。解决方案是使用状态小部件，并将_FormKey直接放在类范围下，而不是窗口小部件的构建。

    class _SignupFormState extends State<SignupForm> {
  final _formkey = GlobalKey<FormState>();
  @override
  Widget build(BuildContext context) {
//rest of the code
}

Answer 5

我使用 hooks_riverpod 。以下代码在构建方法中为我解决了问题。

final formKey = useMemoized(() => GlobalKey<FormState>());

我希望如果您使用 flutter_hooks 。