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In order to access Google Play games services functionality, your game needs to provide thesigned-in player’s account. If the player is not authenticated, your game may encounter errorswhen making calls to the Google Play games services APIs. This documentation describes how toimplement a seamless sign-in experience in your game.

Implementing player sign-in

The GoogleSignInClient class is the main entry point to retrieve the account of the currentlysigned-in player, and to sign-in the player if they have not previously done so on your app in thedevice.

To create a sign-in client, follow these steps:

1. Create a sign-in client via theGoogleSignInOptionsobject, as shown in the following code snippet. In theGoogleSignInOptions.Builderto configure your sign-in, you must specifyGoogleSignInOptions.DEFAULT_GAMES_SIGN_IN.

2. If you want to use aSnapshotsClient,then you need to add .requestScopes(Drive.SCOPE_APPFOLDER) to yourGoogleSignInOptions.Builder,as shown in the following code snippet:

   Caution: Don't request any other scopes or Google profile data unlessthey're essential for your use case. Any other scope causes the first timesilent sign-in to fail, except for users who have already signed insuccessfully on a different device.

3. Call the GoogleSignIn.getClient() method and pass inthe options that you configured in the previous steps. If the call issuccessful, the Google Sign-In API returns an instance ofGoogleSignInClient.

Check whether player is already signed in

You can check whether an account is already signed inon the current device using GoogleSignIn.getLastSignedInAccount()and whether this account already has the required permissions granted usingGoogleSignIn.hasPermissions().If both conditions are true—that is, getLastSignedInAccount() returns anon-null value and hasPermissions() returns true—you can safely usethe account returned from getLastSignedInAccount(), even if the device isoffline.

Performing silent sign-in

You can call silentSignIn() to retrieve the currently signed-in player’s account,and try to sign players in without displaying a user interface if they havesuccessfully signed in to your app on a different device.

The silentSignIn() method returns a Task<GoogleSignInAccount>. When the task completes,you set the GoogleSignInAccount field you declared earlier to the sign-in account that the taskreturns as the result, or to null, indicating there is not a signed-in user.

If the silent sign-in attempt fails, you can optionally send the sign-in intent to display asign-in user interface, as described inPerforming interactive sign-in.

Since the state of the signed-in player can change when the activity is not in the foreground, werecommended calling silentSignIn() from the activity'sonResume()method.

To perform the sign-in silently, follow these steps:

1. Call the silentSignIn() method on the GoogleSignInClient to start the silent sign-in flow.This call returns an Task<GoogleSignInAccount> object which contains a GoogleSignInAccount ifsilent sign-in is succesful.
2. Handle the success or failure of the player sign-in by overridingOnCompleteListener.
   • If the sign-in task was successful, get the GoogleSignInAccountobject by calling getResult().
   • If sign-in was not successful, you can send a sign-in intent to launch an interactive sign-in flow.For a list of additional callback listeners you can use, see theTasks API developer guideand TaskAPI reference.

The following code snippet shows how your app can perform silent sign-in:

If the silent sign-in attempt fails, you can callgetException() toobtain an ApiExceptionwith the detailed status code. A status code of CommonStatusCodes.SIGN_IN_REQUIREDindicates that the player needs to take explicit action to sign-in. In this case, your app shouldlaunch an interactive sign-in flow as described in the next section.

Performing interactive sign-in

To sign in with player interaction, your app needs to launch the sign-in intent. If successful,the Google Sign-In API displays a user interface that prompts the player to enter their credentialsto sign in. This approach simplifies your app development, since the sign-in activity handlesscenarios such as needing to update Google Play services or showing consent prompts, on your app’sbehalf. The result is returned via theonActivityResultcallback.

To perform the sign-in interactively, follow these steps:

1. Call getSigninIntent() on the GoogleSignInClient to obtain a sign-in intent, then callstartActivity()and pass in that intent. The following code snippet shows how your app canlaunch an interactive sign-in flow:

2. In the onActivityResult()callback, handle the result from the returned intent.

   • If the sign-in result was successful, get theGoogleSignInAccount object from the GoogleSignInResult.
   • If sign-in result was not successful, you should handle the sign-in error (for example, bydisplaying an error message in an alert).The following code snippet shows how your app can handle the results of player sign-in:

Retrieving player information

The GoogleSignInAccount that the Google Sign-In API returns does not contain any playerinformation. If your game uses player information, such as the player’s display name and player ID,you can follow these steps to retrieve this information.

1. Obtain a PlayersClient object by calling the getPlayersClient() method, and passing inthe GoogleSignInAccount as a parameter.
2. Use the PlayersClient methods to asynchronously load the Playerobject that contains a player’s information. For example, you can call getCurrentPlayer()to load the currently signed-in player. If the task returns anApiException with status codeof SIGN_IN_REQUIRED,this indicates that the player needs to be re-authenticated. To do this, callGoogleSignInClient.getSignInIntent()to sign in the player interactively.
3. If the task successfully returns the Player object, you can then call the methods of thePlayer object to retrieve specific player details (for example,getDisplayName()or getPlayerId().

Providing a sign-in button

To provide a standard Google sign-in button in your game, you can use one ofthese approaches:

• Include a com.google.android.gms.common.SignInButtonon the main activity layout; or
• Design a custom sign-in button according to the Google Sign-In brandingguidelines.

When users click the sign-in button, your game should initiate the sign-in flow by sending asign-in intent, as described in Performing interactive sign-in.

This code snippet shows how you can add a sign-in button in the onCreate()method for your activity.

The following code snippet shows how you can send the sign-in intent when the user clicks on thesign-in button.

Displaying game pop-ups

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You can display pop-up views in your game using the GamesClient class. For example, your gamecan display a “Welcome back” or an “Achievements unlocked” pop-up. To allow Google Play games servicesto launch pop-ups in views in your game, call thesetViewForPopups()method. You can further customize where the pop-up appears in the screen by callingsetGravityForPopups().

Signing the player out

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Signing-out is done via call the signOut() method on the GoogleSignInClient.