android - 无法捕获 Firebase 异常

Question

我刚刚创建了 SignIn(AppCompatActivity Activity, String email, String password) 方法来登录我的 Firebase Android 应用中的现有用户。它可以在正确的凭据下完美运行，但是当输入不正确的电子邮件和/或密码时，它无法捕获正确的异常。方法如下:

public static int SignIn(final AppCompatActivity activity, String email, String password) {
    int resultTask = -2;
    FirebaseUtil.mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(activity, new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (task.isSuccessful()) {
                if (!FirebaseUtil.mAuth.getCurrentUser().isEmailVerified()) {
                    FirebaseUtil.mAuth.getCurrentUser().sendEmailVerification();
                    FirebaseUtil.mAuth.signOut();
                    resultTask = 1;
                } else {
                    FirebaseUtil.isCustom = true;
                    resultTask = 2;
                }
            } else
                resultTask = -1;
        }
    });
    return resultTask;
}

当输入错误的凭据时，它返回 -2。该方法出了什么问题？

编辑(2)

答案在这里

我通过将方法类型从 int 更改为 void 解决了这个问题。原因如下:

在我的 Activity/fragment 中，我调用了类似的方法，

int result = SignInUpActivity(_params_);

请注意该方法的默认返回值(它是 -2，但在执行登录/注册等 Firebase 操作后，它可能会返回任何其他值)。在这行之后，我检查结果:

if (result == -2) {
    // some stuff
}
else if (result == -1) {
    // some other stuff
}
else if (result == 0) {
    // ...
}
// and other value checks for result handling 

此时，我没有给 Firebase 时间来获取/检查/执行其自己的身份验证方法。因此，SignInUpActivity() 返回其默认值 (-2)。为了彻底解决这个问题，我将方法类型从 int 更改为 void。

我的最终代码如下所示:

public static void SignIn(final AppCompatActivity activity, final String email, final String password) {
    FirebaseUtil.mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (!task.isSuccessful()) {
                if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {
                    /**
                     * Thrown when one or more of the credentials passed to a method fail to
                     * identify and/or authenticate the user subject of that operation.
                     * Inspect the error code and message to find out the specific cause.
                     * https://firebase.google.com/docs/reference/android/com/google/firebase/auth/FirebaseAuthInvalidCredentialsException
                     */
                    ProgressDialog.DismissProgressDialog();
                    AlertDialog.ShowAlertDialog(activity,
                            "Invalid credentials", "Check email and password again.",
                            true, "ok", null,
                            false, "", null,
                            false, -1,
                            true);
                } else if (task.getException() instanceof FirebaseAuthInvalidUserException) {
                    /**
                     * Inspect the error code and message to find out the specific cause.
                     * https://firebase.google.com/docs/reference/android/com/google/firebase/auth/FirebaseAuthInvalidUserException
                     */
                    ProgressDialog.DismissProgressDialog();
                    AlertDialog.ShowAlertDialog(activity,
                            "Invalid credentials", "Check email and password again.",
                            true, "ok", null,
                            false, "", null,
                            false, -1,
                            true);
                }
            } else {
                if (!FirebaseUtil.mAuth.getCurrentUser().isEmailVerified()) {
                    FirebaseUtil.mAuth.getCurrentUser().sendEmailVerification();
                    FirebaseUtil.mAuth.signOut();
                    ProgressDialog.DismissProgressDialog();
                    AlertDialog.ShowAlertDialog(activity,
                            "Email not verified", "To start working, please verify your email.",
                            true, "ok", null,
                            false, "", null,
                            true, R.drawable.ic_verified_user,
                            true);
                } else {
                    FirebaseUtil.isCustom = true;
                    ProgressDialog.DismissProgressDialog();
                }
            }
        }
    });
}

public static void Register(final AppCompatActivity activity, final String email, final String password) {
    FirebaseUtil.mAuth.createUserWithEmailAndPassword(email, password)
        .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (!task.isSuccessful()) {
                    if (task.getException() instanceof FirebaseAuthUserCollisionException) {
                        /**
                         * Thrown when an operation on a FirebaseUser instance couldn't be
                         * completed due to a conflict with another existing user.
                         * https://firebase.google.com/docs/reference/android/com/google/firebase/auth/FirebaseAuthUserCollisionException
                         */
                        ProgressDialog.DismissProgressDialog();
                        AlertDialog.ShowAlertDialog(activity,
                                "Try another", "This email has already registered.",
                                true, "ok", null,
                                false, "", null,
                                false, -1,
                                true);
                    } else {
                        ProgressDialog.DismissProgressDialog();
                        AlertDialog.ShowAlertDialog(activity,
                                "Whoops", "An error occurred. Try again later.",
                                true, "ok", null,
                                false, "", null,
                                false, -1,
                                true);
                    }
                } else {
                    try {
                        FirebaseUtil.mAuth.getCurrentUser().sendEmailVerification();
                        FirebaseUtil.mAuth.signOut();
                        ProgressDialog.DismissProgressDialog();
                        AlertDialog.ShowAlertDialog(activity,
                                "The last step", "For verification, instructions sent to your email. Please, check your email.",
                                true, "ok", null,
                                false, "", null,
                                true, R.drawable.ic_verified_user,
                                true);
                    } catch (Exception e) {
                        ProgressDialog.DismissProgressDialog();
                        AlertDialog.ShowAlertDialog(activity,
                                "Whoops", "An error occurred. Try again later.",
                                true, "ok", null,
                                false, "", null,
                                false, -1,
                                true);
                    }
                }
            }
        });
}

无论如何，问题解决了。

Answer 1

根据这个问题:How to catch a Firebase Auth specific exceptions

你应该检查

if (!task.isSuccessful())

但是你正在做

if (task.isSuccessful())

然后您可以在 try block 内抛出由 task.getException 返回的异常，并捕获您正在使用的方法可能抛出的每种类型的异常