How to create unique token, in every users firebase android?

Question

I want to generate and store token everytime users login. I tried for my code below, but it always generate same token when I login with another account.

mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(LoginActivity.this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        AlertDialog.dismiss();
                        if (!task.isSuccessful()) {
                            if (password.length() < 6) {
                                new SweetAlertDialog(LoginActivity.this, SweetAlertDialog.ERROR_TYPE)
                                        .setTitleText("Oops...")
                                        .setContentText("Enter minimum 6 charachters !! ")
                                        .show();
                            } else {
                                passwordInput.setText("");
                                new SweetAlertDialog(LoginActivity.this, SweetAlertDialog.ERROR_TYPE)
                                        .setTitleText("Oops...")
                                        .setContentText("Authentication failed !!")
                                        .show();
                            }
                        } else {



                            Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                            startActivity(intent);
                            FirebaseUser users = FirebaseAuth.getInstance().getCurrentUser();
                            DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference("users/"+ users.getUid());
                            String token = FirebaseInstanceId.getInstance().getToken();

                            Log.e("tokenid",""+token);
                            mDatabase.child("token_id").setValue(token);
                            finish();
                        }
                    }
                });
            }
        });

please help, thanks..

Alex Mamo · Accepted Answer · 2018-09-17T10:48:53.500

3

When using the following line of code:

String token = FirebaseInstanceId.getInstance().getToken();

You are getting the Firebase Instance ID token, which is also known as FCM token, on the client side. You need to know that in Firebase there two different tokens:

A FCM Token/Instance ID token that identifies an installation of a specific application on a specific user device. It doesn't identify in any way a particular user.
An Auth ID token identifies a specific user of a specific application. It doesn't identify in any way a particular device.

The two tokens are quite different and serve different purposes. Please see the official documentation for Android regarding on how to retrieve ID tokens on clients.

The identity of the user is remembered indefinitely (or until you sign out). But their credentials (or rather, whether their token is still valid) are re-checked every hour.

edited Sep 17 '18 at 10:48

answered Sep 17 '18 at 10:21

Alex Mamo

130,605
17
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I'm using for your code it work nice and generate different token, but every time im login with the same account. It also generate different token – yehezkiel yehezkiel Sep 17 '18 at 10:31
Good to hear that it worked! :) Yes, the identity of the user is remembered indefinitely (or until you sign out). But their credentials (or rather, whether their token is still valid) are re-checked every hour. – Alex Mamo Sep 17 '18 at 10:46
1 more question, how to delete the token, when users loging out? – yehezkiel yehezkiel Sep 17 '18 at 11:29
See this: https://github.com/googlearchive/firebase-token-generator-node/issues/3 – Alex Mamo Sep 17 '18 at 11:30
Sir, after long process I'm realize. This is not fcm token. I want to generate FCM Token – yehezkiel yehezkiel Sep 19 '18 at 08:44
@yehezkielyehezkiel In this case, you should make your own attempt and ask another question if something else comes up. – Alex Mamo Sep 19 '18 at 08:46

score 0 · Answer 2 · answered Sep 17 '18 at 10:27

FCM generates a registration token for the client app instance, hence It may happen that you'll get the same token for different users in your app. You can use forceRefresh to generate a new token every time. Register new token everytime user logins to any device and save it in DB and update with a new token on new login this way you will have a new token for each user on every login (If this fits your requirement)

Here is a good answer to understand how it works Firebase FCM force onTokenRefresh() to be called

Rostyslav Barmakov · Answer 3 · 2018-09-17T10:12:49.760

-1

Use UUID.randomUUID().toString()

You can read more here.

java docs - and here =)

edited Sep 17 '18 at 10:12

answered Sep 17 '18 at 10:10

Rostyslav Barmakov

186
9

I want to store token, not uid sir.. please read the question carefully – yehezkiel yehezkiel Sep 17 '18 at 10:12
Oh. Got it. Sorry. Let me think a little bit – Rostyslav Barmakov Sep 17 '18 at 10:17

How to create unique token, in every users firebase android?

3 Answers3