Firebase - How to check whether a user has already signed up using Phone Number
Solution 1
In order to detect whether that phone number has already been used for account registration, you can't only rely on the default authentication table. But also has to use the Firebase database to create a Dummy user table for checking.
For example, you can create a json tree to save user data in the realtime database in to something structured like this:
And your piece of code should looks similar to:
On the piece of code of successful login/user registration:
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();
}
}
Solution 2
onTask
result check FirebaseAuthUserCollisionException
if (task.getException() instanceof FirebaseAuthUserCollisionException) {
Toast.makeText(Signup.this, "User already exist.", Toast.LENGTH_SHORT).show();
}
Solution 3
I have done this into my project and it is working perfectly, you can use this, you can use your phone number instead of "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);
Solution 4
For the solution,
After signup please make some entry in Database which makes an identity of the user, so next time you can identify user already signup.
After OTP verification check in RealTime database already Mobile number exists then so its already otherwise do an entry of that particular mobile number.
Solution 5
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) {
}
});
Mirza Asad
A Young , Enthusiast, Self-motivated Software-Engineer who love taking initiatives, experimenting with new technology and diving into new domains.
Updated on June 17, 2022Comments
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Mirza Asad about 2 years
I am using firebase phone Authentication . When a user creates a account using phone number and next time he creates account with same phone number Than I want to show a message saying account already exists