Try using a callback such as the following, and observe that the old value is always -1

listView.getSelectionModel().selectedIndexProperty().addListener(new ChangeListener<Number>() {
    public void changed(ObservableValue<? extends Number> ov, Number t, Number t1) {
        System.out.println("change listener: " + t + " -> " + t1);
    }
});

Workaround: Developer can locally record the old value of the selected index within the ChangeListener anonymous inner class.