Import 'package:firebase_auth/firebase_auth. Go to the Sign-in Method page in the Firebase Authentication section to enable Email/Password sign-in and any other identity providers you want for your app. Import 'package:firebase_core/firebase_core.dart' So if you run that, leave the e-mail address blank and hit the Sign Up Button, you will see the error, shown in the picture to the right. Kind of hard to explain so hopefully that made sense. So when you press the sign up button, if the validators return null, it assumes everything is ok and contacts Firebase. Screenshot when enabling Email/Password provider in Firebase by author Install the firebaseauth package into your Flutter app if you haven’t already done so. Click on it, enable the checkbox, and confirm with Save. But our return is also set to String ? (String ? validateEmail) because as you can tell by the last line of the validateEmail method, if everything is ok, we are returning null. Example: Authentication with mail and password First, we need to activate the Email/Password provider. Then we check to see if it's null or empty and if it is we return that the E-mail address is required. So we say it can potentially come through null with "String ? formEmail". You can use Firebase Authentication to sign in a user by sending them an email containing a link, which they can click to sign in. Besides levying a user on constantly remembering multiple passwords, social authentication eases the registration process and improves security. ![]() In manycases, you will need to know about the authentication stateof your user,such as whether theyre logged in or logged out. JTopics: API Social authentication is an authentication technique in which one uses an existing account to log into or create a new account in another application. The e-mail address is sent through the validator automatically. Firebase Auth provides many methods and utilities for enabling you to integratesecure authentication into your new or existing Flutter application. So since Null Safety is new to Flutter I'll try to explain what's going on. 6 min read 1938 Whether you’re working a simple to-do application or building your dream app, authentication helps you personalize the experience with user-specific information.
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