sprockets/src/main/java/net/sf/sprockets/gms/common/api/GoogleApiClients.java
public static GoogleApiClient connect(GoogleApiClient client, ConnectedListener connected,
                                          OnConnectionFailedListener failed) {
        client.registerConnectionCallbacks(new ConnectionListener(connected));
        client.registerConnectionFailedListener(failed);
        client.connect();
        return client;
    }
public static GoogleApiClient connect(GoogleApiClient client, ConnectedListener connected,
                                          OnConnectionFailedListener failed) {
        client.registerConnectionCallbacks(new ConnectionListener(connected));
        client.registerConnectionFailedListener(failed);
        client.connect();
        return client;
    }
Register the listeners and then connect the client.