Creates a new Builder

Returns the PhoneAuthOptions that this PhoneAuthOptions.Builder has constructed.

Specifies whether to force an SMS to be sent for second factor validation.

In some cases the phone number can be instantly verified without needing to send or enter a verification code. This feature can be disabled here, and it is enabled by default.

This is only applicable to Multi-Factor Authentication.

Sets the Activity to which the callbacks are scoped, and with which app verification will be completed. This is an optional parameter of the builder, but is required to perform a reCAPTCHA fallback for client verification. If the activity is not set and a reCAPTCHA verification is attempted, a FirebaseAuthMissingActivityForRecaptchaException error is thrown, which can be handled in the PhoneAuthProvider.OnVerificationStateChangedCallbacks.onVerificationFailed(FirebaseException) callback.

Sets the callbacks to get the status of phone number verification. The callbacks will be automatically removed when the specified activity has stopped.

When a test phone number and SMS code pair is set via FirebaseAuthSettings.setAutoRetrievedSmsCodeForPhoneNumber(String, String) and in the Firebase console, PhoneAuthProvider.OnVerificationStateChangedCallbacks.onCodeAutoRetrievalTimeOut(String) will never be triggered.

Sets the PhoneAuthProvider.ForceResendingToken to force another verification SMS to be sent before the auto-retrieval timeout.

Sets the PhoneMultiFactorInfo to use for second factor sign-in.

Sets the MultiFactorSession that holds the necessary data to start an SMS verification for multi-factor authentication enrollment or sign in.

When this is set, the verification will be for validating ownership of a phone SMS second factor, not for phone authentication.

Sets the phone number for sign-in, sign-up, or second factor enrollment.

Sets the maximum amount of time you are willing to wait for SMS auto-retrieval to be completed by the library.

The minimum timeout is 30 seconds, and the maximum timeout is 2 minutes. If you specified a positive value less than 30 seconds, library will default to 30 seconds. Specifying a negative timeout or a timeout that is greater than 120 seconds will result in an IllegalArgumentException being thrown.

Use 0 to disable SMS-auto-retrieval. This will also cause PhoneAuthProvider.OnVerificationStateChangedCallbacks.onCodeAutoRetrievalTimeOut(String) to be called immediately.