linking facebook authentication with phone authentication

[tanujraj08]

i would like to know if i am linking face book authentication with phone no. authentication and i have done it once but after logging out and if i try to login again it will again ask for my phone no. is there any way so that when i am logging in again it remembers that i have already done phone no. authentication.by adding these feature i can also restrict user from logging in without adding phone no.

my codes for fb authenticaton

      
 AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        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");
                            Intent intent = new Intent(MainActivity.this,PhoneAuth.class);
                            startActivity(intent);
                            finish();
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "signInWithCredential:failure", task.getException());
                            Toast.makeText(MainActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();

                        }


                        progressBar.setVisibility(View.GONE);
                        // [END_EXCLUDE]
                    }
                });
    }

and here is my codes phon no authentication login

public void signInWithPhoneAuthCredential(PhoneAuthCredential credential){
        mAuth.getCurrentUser().linkWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            Log.d(TAG, "linkWithCredential:success");
                            Intent intent = new Intent(PhoneAuth.this, Main2Activity.class);
                            startActivity(intent);


                        } else {
                            Log.w(TAG, "signInWithCredential:failure", task.getException());
                            if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {
                                // The verification code entered was invalid
                                // [START_EXCLUDE silent]
                                mVerificationField.setError("Invalid code.");
                                // [END_EXCLUDE]
                            }else{
                                Toast.makeText(PhoneAuth.this, "No.Already Used",
                                        Toast.LENGTH_SHORT).show();
                                Intent intent=new Intent(PhoneAuth.this,Main2Activity.class);
                                startActivity(intent);

                            }
                        }



                    }
                });

@samtstern

[samtstern]

is there any way so that when i am logging in again it remembers that i have already done phone no. authentication.by adding these feature i can also restrict user from logging in without adding phone no.

Sorry I don't quite understand what you are asking. Could you explain the flow you want step by step?

[tanujraj08]

the thing is i want to add phone no. to a user who has logged in using facebook but before adding that phone no. i want to verify that the no. is authentic using otp. but i don't want the user to login using phone no. just verify the no.is there any way to do so in firebase

[samtstern]

@tanujraj08 in general we don't support phone number verification without signing in.

However, if you were to create a second FirebaseApp instance (and therefore a separate FirebaseAuth instance) you could get a similar effect. Each FirebaseApp has its own authentication state. So if you do phone auth on the second app, you will not disturb the sign-in state on the default app.