Project configuration

Go to Firebase console and inside the authentication window, go to sign-in method and enable phone number sign- in. Now, we need to add the phone number provider inside the getAuthProviderList method:

private List<AuthUI.IdpConfig> getAuthProviderList() {
    List<AuthUI.IdpConfig> providers = new ArrayList<>();
    providers.add(
            new AuthUI.IdpConfig.Builder(AuthUI.EMAIL_PROVIDER).build());
    providers.add(new
            AuthUI.IdpConfig.Builder(AuthUI.GOOGLE_PROVIDER).build());
    providers.add(new
            AuthUI.IdpConfig.Builder(AuthUI.FACEBOOK_PROVIDER).build());
    providers.add(new
            AuthUI.IdpConfig.Builder(AuthUI.TWITTER_PROVIDER).build());
    providers.add(new
            AuthUI.IdpConfig.Builder(AuthUI.PHONE_VERIFICATION_PROVIDER).build());
    return providers;
}

Now that we have successfully integrated phone number verification into the application,  let's compile the output:

This screenshot shows the successful integration of the FirebaseUI for phone number sign-in.