mravn-google/google_sign_in

google_sign_in

A Flutter plugin for Google Sign In.

Note: This is a work-in-progress, and is not fully supported by the Flutter team. (For example, we don't have this under continuous integration and testing.)

Android integration

To access Google Sign-In, you'll need to make sure to register your application. The instructions to find the SHA-1 of your signing certificate can be misleading if you're building in google3. You can get the correct SHA-1 building an APK and running this command on it:

unzip -p /path/to/app.apk META-INF/CERT.?SA|keytool -printcert|grep 'SHA1:'|sed 's/^.*SHA1: //'

You don't need to include the google-services.json file in your app unless you are using Google services that require it. You do need to enable the OAuth APIs that you want, using the Google Cloud Platform API manager. For example, if you want to mimic the behavior of the Google Sign-In sample app, you'll need to enable the Google People API.

Add the following code to your main activity:

private GoogleSignInPlugin googleSignIn;

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    googleSignIn.onActivityResult(requestCode, resultCode, data);
}

Add the following to your Activity's onCreate method:

googleSignIn = GoogleSignInPlugin.register(this);

iOS integration

To access Google Sign-In, you'll need to make sure to register your application. Add the generated GoogleService-Info.plist to root of your Runner project in Xcode, so that the Google Sign-In framework can determine your client id.

You'll need to add this to the main dictionary of your application's Info.plist:

        <key>CFBundleURLTypes</key>
        <array>
                <dict>
                        <key>CFBundleTypeRole</key>
                        <string>Editor</string>
                        <key>CFBundleURLSchemes</key>
                        <array>
                                <!-- bundle id, for example: -->
                                <string>com.yourcompany.myapp</string>
                        </array>
                </dict>
                <dict>
                        <key>CFBundleTypeRole</key>
                        <string>Editor</string>
                        <key>CFBundleURLSchemes</key>
                        <array>
                                <!-- reverse url of your client id, for example: -->
        <string>com.googleusercontent.apps.861823949799-11qfr04mrfh2mndp3el2vgc0e357a2t6</string>
                        </array>
                </dict>
        </array>

Add the following private member data to your AppDelegate:

@implementation AppDelegate {
  GoogleSignInPlugin* _googleSignInPlugin;
}

Add the following code to application:didFinishLaunchingWithOptions::

_googleSignInPlugin = [[GoogleSignInPlugin alloc] initWithFlutterView:flutterController];

Add the following code to your AppDelegate:

- (BOOL)application:(UIApplication *)app
            openURL:(NSURL *)url
            options:(NSDictionary *)options {
    NSString *sourceApplication = options[UIApplicationOpenURLOptionsSourceApplicationKey];
    id annotation = options[UIApplicationOpenURLOptionsAnnotationKey];
    return [_googleSignInPlugin handleURL:url
                        sourceApplication:sourceApplication
                               annotation:annotation];
}

Usage

Add the following import to your Dart code:

import 'package:google_sign_in/google_sign_in.dart';

Initialize GoogleSignIn with the scopes you want:

GoogleSignIn.initialize(
    scopes: [
      'email',
      'https://www.googleapis.com/auth/contacts.readonly',
    ],
);

You can now use the GoogleSignIn class to authenticate in your Dart code, e.g.

GoogleSignInAccount account = await (await GoogleSignIn.instance).signIn();

See google_sign_in.dart for more API details.

Issues and feedback

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