chronos/src/main/java/com/redmadrobot/chronos/ChronosConnector.java
public final void onSaveInstanceState(@Nullable final Bundle outState) {
        if (outState != null) {
            outState.putInt(KEY_CHRONOS_LISTENER_ID, mChronosListener.getId());
        }
    }
public final void onSaveInstanceState(@Nullable final Bundle outState) {
        if (outState != null) {
            outState.putInt(KEY_CHRONOS_LISTENER_ID, mChronosListener.getId());
        }
    }
GUI client should call this method in its own onSaveInstanceState() method.

@param outState parameter from the corresponding client method