Question

我已经为我的应用登录了Firebase。我想向用户报告异常，以便他可以正确登录。这是电子邮件地址和密码登录signInWithEmailAndPassword(_email, _password)。测试我可以创建两个可以自我解释的异常

1 / Error: PlatformException(exception, There is no user record corresponding to this identifier. The user may have been deleted., null)

2 / Error: PlatformException(exception, The password is invalid or the user does not have a password., null)

我正在使用try catch block来捕获错误。这是我的代码：

void validateAndSubmit() async {
    FocusScope.of(context).requestFocus(new FocusNode());
    if (validateAndSave()) {
      try {
        var auth = AuthProvider.of(context).auth;
        FirebaseUser user =
            await auth.signInWithEmailAndPassword(_email, _password);
        print('Signed in: ${user.uid}');
        Navigator.pop(context);
        widget.loginCallback(user);

      } catch (e) {
        print('Error: $e');
        setState(() {
          _showMessage=true;

        });
      }
    }
  }

我想根据异常情况给出不同的消息。但是似乎没有与异常相关的任何代码。

Answer 1

您可以捕获不同种类的异常，对于每种异常，您都可以检查代码


  void validateAndSubmit() async {
    FocusScope.of(context).requestFocus(new FocusNode());
    if (validateAndSave()) {
      try {
        var auth = AuthProvider.of(context).auth;
        FirebaseUser user =
            await auth.signInWithEmailAndPassword(_email, _password);
        print('Signed in: ${user.uid}');
        Navigator.pop(context);
        widget.loginCallback(user);

      } on FirebaseAuthInvalidUserException catch (e) {
        print('FirebaseAuthInvalidUserException: $e');
        if (e.code === 'ERROR_USER_NOT_FOUND') {
          setState(() {
            _showMessage=true;

          });
        } else {
          // do something
        }
      }
      } on FirebaseAuthInvalidCredentialsException catch (e) {
        // do something InvalidCredentials 
      }  catch (e) {
        // do something else
      } 
    }

Answer 2

您可以选中e.code。签出本地Firebase documentation。它的值类似于“ ERROR_USER_NOT_FOUND”

我该如何区分使用Firebase进行颤动式身份验证的异常之间的区别？

2 个答案: