java - 如何检查用户是否已通过 gmail 或 google 帐户登录？

Question

                if(!em.isEmpty() || !pass.isEmpty()) {
                    mfirebaseAuth.signInWithEmailAndPassword(em, pass).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                        @Override
                        public void onComplete(@NonNull Task<AuthResult> task) {
                            if (task.isSuccessful()) {
                                    Toast.makeText(getApplicationContext(), "Logged in successfully", Toast.LENGTH_SHORT).show();


                            } else {
                                String errorCode = ((FirebaseAuthException) task.getException()).getErrorCode();

                                switch (errorCode) {

                                    case "ERROR_INVALID_EMAIL":
                                        Toast.makeText(MainLoginActivity.this, "The email address is badly formatted.", Toast.LENGTH_LONG).show();
                                        email.setError("The email address is badly formatted.");
                                        email.requestFocus();
                                        break;


                                    case "ERROR_USER_MISMATCH":
                                        Toast.makeText(MainLoginActivity.this, "The supplied credentials do not correspond to the previously signed in user.", Toast.LENGTH_LONG).show();
                                        break;

                                    case "ERROR_ACCOUNT_EXISTS_WITH_DIFFERENT_CREDENTIAL":
                                        Toast.makeText(MainLoginActivity.this, "An account already exists with the same email address but different sign-in credentials. Sign in using associated email address.", Toast.LENGTH_LONG).show();
                                        break;

                                    case "ERROR_EMAIL_ALREADY_IN_USE":
                                        Toast.makeText(MainLoginActivity.this, "The email address is already in use by another account.", Toast.LENGTH_LONG).show();
                                        email.requestFocus();
                                        break;

                                    case "ERROR_CREDENTIAL_ALREADY_IN_USE":
                                        Toast.makeText(MainLoginActivity.this, "This credential is already associated with a different user account.", Toast.LENGTH_LONG).show();
                                        break;

                                    case "ERROR_USER_DISABLED":
                                        Toast.makeText(MainLoginActivity.this, "The user account has been disabled by an administrator.", Toast.LENGTH_LONG).show();
                                        break;

                                    case "ERROR_INVALID_USER_TOKEN":
                                        Toast.makeText(MainLoginActivity.this, "The user\\'s credential is no longer valid. The user must sign in again.", Toast.LENGTH_LONG).show();
                                        break;

                                    case "ERROR_WRONG_PASSWORD":
                                        Toast.makeText(MainLoginActivity.this, "The password is invalid or the user does not have a password.", Toast.LENGTH_LONG).show();
                                        password.setError("password is incorrect ");
                                        password.requestFocus();
                                        password.setText("");
                                        break;

                                    default:
                                        Toast.makeText(getApplicationContext(), "Error! " + task.getException().getMessage(), Toast.LENGTH_SHORT).show();


                                }
                            }
                        }
                    });
                }

我面临的问题是:

用户首次使用“通过电子邮件注册”进行注册。之后，用户使用 Google 帐户注册(使用同一电子邮件)。

之后，当用户尝试通过电子邮件和密码登录时。我收到密码不正确的错误，我知道发生这种情况是因为使用电子邮件详细信息进行注册已被 Google 帐户详细信息覆盖。

我想显示错误“该电子邮件已与 Google 帐户关联。请通过 Google 帐户登录”。

Answer 1

您应该使用AuthCredential和isNewUser这是示例

 private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
        Log.d("TAG", "signInWithCredential:success" + acct.getId());

        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
        mAuth.signInWithCredential(credential).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            boolean isNewUser = task.getResult().getAdditionalUserInfo().isNewUser();
            if (isNewUser) {

                Log.d(TAG, "Is New User!");
                FirebaseUser user = mAuth.getCurrentUser();
                //do something
                //You can call register class or function here


            } else {

                Log.d(TAG, "Is Old User!");
                //Do something else


            }
        }

    });

}