lock-google/src/main/java/com/auth0/android/google/GoogleAPI.java
public void logoutAndClearState() {
        if (client != null && client.isConnected()) {
            logout();
            client.disconnect();
        }
        activity = null;
        client = null;
    }
public void logoutAndClearState() {
        if (client != null && client.isConnected()) {
            logout();
            client.disconnect();
        }
        activity = null;
        client = null;
    }
Clears this helper state. After this method is called the provider should not be used.