| GooglePlayServicesClient | Base class for clients that connect with Google Play services. |
| GooglePlayServicesClient.ConnectionCallbacks | Provides callbacks that are called when the client is connected or disconnected from the service. |
| GooglePlayServicesClient.OnConnectionFailedListener | Provides callbacks for scenarios that result in a failed attempt to connect the client to the service. |
| AccountPicker | Common account picker similar to the standard framework account picker introduced in ICS:
newChooseAccountIntent. |
| ConnectionResult | Contains all possible error codes for when a client fails to connect to Google Play services. |
| GooglePlayServicesUtil | Utility class for verifying that the Google Play services APK is available and up-to-date on this device. |
| Scopes | OAuth 2.0 scopes for use with Google Play services. |
| SignInButton | The Google sign-in button to authenticate the user. |
| GooglePlayServicesNotAvailableException | Indicates Google Play services is not available. |
| GooglePlayServicesRepairableException | GooglePlayServicesRepairableExceptions are special instances of
UserRecoverableExceptions which are thrown when Google Play Services is not installed,
up-to-date, or enabled. |
| UserRecoverableException | UserRecoverableExceptions signal errors that can be recovered with user action, such as a user login. |