How to resend SMS verification in Firebase Phone Authentication Android?

Question

According to Firebase documentation (https://firebase.google.com/docs/auth/android/phone-auth#send-a-verification-code-to-the-users-phone), there is callback for handling the phone number authentication.

mCallbacks = new PhoneAuthProvider.OnVerificationStateChangedCallbacks() {      @Override     public void onVerificationCompleted(PhoneAuthCredential credential) {          Log.d(TAG, "onVerificationCompleted:" + credential);         signInWithPhoneAuthCredential(credential);     }      @Override     public void onVerificationFailed(FirebaseException e) {          Log.w(TAG, "onVerificationFailed", e);     }      @Override     public void onCodeSent(String verificationId,                            PhoneAuthProvider.ForceResendingToken token) {          Log.d(TAG, "onCodeSent:" + verificationId);          // Save verification ID and resending token so we can use them later         mVerificationId = verificationId;         mResendToken = token;     } }; 

My question is on onCodeSent method. It said on the doc here (https://firebase.google.com/docs/reference/android/com/google/firebase/auth/PhoneAuthProvider.ForceResendingToken)

that the token can be used to force re-sending an SMS verification code. However, after doing some research on the doc I still don't know how.

I would like to ask how to use this token to resend the SMS verification ?

Answer 1

Source: Firebase Quickstarts for Android

This is the method used to resend SMS Verifications.

private void resendVerificationCode(String phoneNumber,                                     PhoneAuthProvider.ForceResendingToken token) {     PhoneAuthProvider.getInstance().verifyPhoneNumber(             phoneNumber,        // Phone number to verify             60,                 // Timeout duration             TimeUnit.SECONDS,   // Unit of timeout             this,               // Activity (for callback binding)             mCallbacks,         // OnVerificationStateChangedCallbacks             token);             // ForceResendingToken from callbacks }