Question

我正在使用firebase手机身份验证。当用户使用电话号码创建帐户时，下次他创建具有相同电话号码的帐户比我想显示一条消息说帐户已存在

Answer 1

对于解决方案，

注册后，请在数据库中输入一些用户身份的条目，以便下次您可以识别用户已注册。

在实时数据库中进行OTP验证检查后，手机号码已经存在，因此它已经输入了该特定手机号码。

Answer 2

我已经在我的项目中完成了这项工作并且工作正常，您可以使用此功能，您可以使用您的电话号码而不是“deviceId”。

 mFirebaseDatabaseRefrence.orderByChild("deviceId").equalTo(deviceId).addListenerForSingleValueEvent(new ValueEventListener() {

            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                if (dataSnapshot.getValue() != null) {
                    Log.d(TAG, "Datasnap Shots: " + dataSnapshot.getValue());
                      /* if alredy exist and check for first time, second time isExist=true*/
                    if (!isExist) {

                        for (DataSnapshot userSnapshot : dataSnapshot.getChildren()) {
                            UserbasicInfo user = userSnapshot.getValue(UserbasicInfo.class);
                              Toast.makeText(UserInfoActivity.this, "User already exist...!", Toast.LENGTH_SHORT).show();

                        }

                    }
                    isExist = true;
                } else {
                    isExist = false;
                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });

        /*if not exist add data to firebase*/
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                Log.d(TAG, "isExist: " + isExist);
                if (!isExist) {
                    addDataToDB(false);
                } else {
                    addDataToDB(true);

                }
            }
        };
        new Handler().postDelayed(runnable, 5000);

Answer 3

为了检测该电话号码是否已用于帐户注册，您不仅可以依赖默认的身份验证表。但是还必须使用Firebase数据库来创建虚拟用户表以进行检查。

例如，您可以创建一个json树，将实时数据库中的用户数据保存为以下结构：

您的代码应该类似于：

在成功登录/用户注册的代码：

DatabaseRef userRef = FirebaseDatabase.getInstance.getRef("users");
userRef.orderByChild("telNum").equalTo(phoneNumber).addListenerForSingleValueEvent(new ValueEventListener() {

     if (dataSnapshot.getValue() != null){
        //it means user already registered
        //Add code to show your prompt
        showPrompt();
     }else{
        //It is new users
        //write an entry to your user table
        //writeUserEntryToDB();
     }
}

Answer 4

onTask结果检查FirebaseAuthUserCollisionException

if (task.getException() instanceof FirebaseAuthUserCollisionException) {
    Toast.makeText(Signup.this, "User already exist.",  Toast.LENGTH_SHORT).show();
}

Answer 5

我这样处理过。 Firebase会因为在身份验证和其他无效操作时遇到错误而抛出一些异常，我们只需处理它们并通知用户。

示例代码：

    private void signInWithPhoneAuthCredential(PhoneAuthCredential credential) {
    mAuth.signInWithCredential(credential)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if (task.isSuccessful()) {
                        Log.d(TAG, "signInWithCredential:success");
                        //do something on success
                    } else {
                        //handle the error here
                        showInfoToUser(task)
                        }
                    }
                }
            });
}

并通过检查此处的例外来检查我们得到的错误

 private void showInfoToUser(Task<AuthResult> task) {
    //here manage the exceptions and show relevant information to user
    hideProgressDialog();
    if (task.getException() instanceof FirebaseAuthUserCollisionException) {
        showSnackBar(getString(R.string.user_already_exist_msg));
    } else if (task.getException() instanceof FirebaseAuthWeakPasswordException) {
        showSnackBar(task.getException().getMessage());
    } else if (task.getException() instanceOf FirebaseAuthInvalidCredentialsException){
        //invalid phone /otp
        showSnackBar(task.getException().getMessage());
    }
    else {
        showSnackBar(getString(R.string.error_common));
    }
}

Answer 6

DatabaseReference userRef = FirebaseDatabase.getInstance().getReference("Users");
userRef
    .orderByChild("phonenumber")
    .equalTo(mMobile.getText().toString())
    .addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if (dataSnapshot.getValue() != null) {
                //it means user already registered
                //Add code to show your prompt
                OpenErrorAlrt("Mobile Number already registed");
            } else {
                Intent intent = new Intent(getApplicationContext(), OTPVerifyActivity.class);
                intent.putExtra("phonenumber", mMobile.getText().toString());
                startActivity(intent);
            }

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

Answer 7

这是检查用户是否已经在Firebase中注册的非常简单的方法。

 AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
    mAuth.signInWithCredential(credential)
            .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if (task.isSuccessful()) {
                        // Sign in success, update UI with the signed-in user's information
                        Log.d(TAG, "signInWithCredential:success");
                        FirebaseUser user = mAuth.getCurrentUser();
                        if(task.getResult().getAdditionalUserInfo().isNewUser()){
                            register(user);
                        }else{
                            Intent intent = new Intent(LoginActivity.this,MainActivity.class);
                            startActivity(intent);
                        }
                        Toast.makeText(LoginActivity.this, "welcome"+user.getDisplayName(), Toast.LENGTH_SHORT).show();
                    } else {
                        // If sign in fails, display a message to the user.
                        Log.w(TAG, "signInWithCredential:failure", task.getException());
                        Toast.makeText(LoginActivity.this, "signin Failed", Toast.LENGTH_SHORT).show();
                    }

                    // ...
                }
            });

Firebase - 如何检查用户是否已使用电话号码注册

7 个答案: