Use our Android sample app to see how Sign-In works, or add Sign-In to your existing app.
Required: The latest versions of Android Studio and Google Play Services.
Get the project
If this is your first time using a Google services sample, check out the google-services repository.
$ git clone https://github.com/googlesamples/google-services.git
Open Android Studio.
Select File > Open, browse to where you cloned the
google-services
repository, and open
google-services/android/signin
.
Configure a Google API project
To use the sample, you need to provide some additional information to
finish setting up your project. Click the button below, and specify the
package name com
when prompted. You will
also need to provide the SHA-1 hash of your signing certificate. See
Authenticating Your Client
for information.
The sample's IdTokenActivity
and ServerAuthCodeActivity
examples require you to specify an OAuth 2.0 web client ID. In a real app, this
client ID would represent your app's backend server. A client ID for
this purpose was created when you configured the project above.
Find this value by opening the Google API Console:
Google API ConsoleYour web server client ID is displayed next to Web client
(Auto-created for Google Sign-in). Copy and paste the client ID
into your project's strings.xml
file:
<string name="server_client_id">YOUR_SERVER_CLIENT_ID</string>
Run the sample
Now you're ready to build the sample and run it from Android Studio.
Build the sample and click the run button and select a connected device or emulator with the latest version of Google Play services.

How it works
The application builds a GoogleSignInClient
, specifying
the sign-in options it needs. Then, when the sign-in button is
clicked, the application starts the sign-in intent, which prompts the
user to sign in with a Google account.
// Configure sign-in to request the user's ID, email address, and basic // profile. ID and basic profile are included in DEFAULT_SIGN_IN. GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN) .requestEmail() .build();
// Build a GoogleSignInClient with the options specified by gso. mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
private void signIn() { Intent signInIntent = mGoogleSignInClient.getSignInIntent(); startActivityForResult(signInIntent, RC_SIGN_IN); }
Next steps
If you want to see how you can implement Google Sign-In in your own app, take a look at our implementation guide.
Did you have a good experience? Run into trouble? Let us know!