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collinjackson and kroikie Introduce credentials to firebase_auth (#928)
* Move classes into separate files

* Refactoring to use auth providers

* Merge refactoring

* Update to use revised signInWithCredential API
Latest commit a444ad1 Nov 28, 2018


firebase_auth plugin

A Flutter plugin to use the Firebase Authentication API.

pub package

For Flutter plugins for other Firebase products, see FlutterFire.md.

Note: This plugin is still under development, and some APIs might not be available yet. Feedback and Pull Requests are most welcome!


Configure the Google sign-in plugin

The Google Sign-in plugin is required to use the firebase_auth plugin. Follow the Google sign-in plugin installation instructions.

Import the firebase_auth plugin

To use the firebase_auth plugin, follow the plugin installation instructions.

Android integration

Enable the Google services by configuring the Gradle scripts as such.

  1. Add the classpath to the [project]/android/build.gradle file.
dependencies {
  // Example existing classpath
  classpath 'com.android.tools.build:gradle:3.2.1'
  // Add the google services classpath
  classpath 'com.google.gms:google-services:4.2.0'
  1. Add the apply plugin to the [project]/android/app/build.gradle file.
apply plugin: 'com.google.gms.google-services'

Note: If this section is not completed you will get an error like this:

Default FirebaseApp is not initialized in this process [package name].
Make sure to call FirebaseApp.initializeApp(Context) first.

Note: When you are debugging on android, use a device or AVD with Google Play services. Otherwise you will not be able to authenticate.

Use the plugin

Add the following imports to your Dart code:

import 'package:firebase_auth/firebase_auth.dart';

Initialize GoogleSignIn and FirebaseAuth:

final GoogleSignIn _googleSignIn = GoogleSignIn();
final FirebaseAuth _auth = FirebaseAuth.instance;

You can now use the Firebase _auth to authenticate in your Dart code, e.g.

Future<FirebaseUser> _handleSignIn() async {
  GoogleSignInAccount googleUser = await _googleSignIn.signIn();
  GoogleSignInAuthentication googleAuth = await googleUser.authentication;
  FirebaseUser user = await _auth.signInWithGoogle(
    accessToken: googleAuth.accessToken,
    idToken: googleAuth.idToken,
  print("signed in " + user.displayName);
  return user;

Then from the sign in button onPress, call the _handleSignIn method using a future callback for both the FirebaseUser and possible exception.

    .then((FirebaseUser user) => print(user))
    .catchError((e) => print(e));

Phone Auth

You can use Firebase Authentication to sign in a user by sending an SMS message to the user's phone. The user signs in using a one-time code contained in the SMS message.

iOS setup

  1. Enable Phone as a Sign-In method in the Firebase console
  • When testing you can add test phone numbers and verification codes to the Firebase console.
  1. Enable App verification

Note: App verification may use APNs, if using a simulator (where APNs does not work) or APNs is not setup on the device you are using you must set the URL Schemes to the REVERSE_CLIENT_ID from the GoogleServices-Info.plist file.

Android setup

  1. Enable Phone as a Sign-In method in the Firebase console
  • When testing you can add test phone numbers and verification codes to the Firebase console.


See the example application source for a complete sample app using the Firebase authentication.

Issues and feedback

Please file issues to send feedback or report a bug. Thank you!