如何在黑莓中为ListField设置FieldChangeListener？

Question

我是黑莓新手..我需要一些帮助。如何在黑莓中为ListField设置FieldChangeListener？

Answer 1

这样：

yourListField.setChangeListener(fieldChangeListenerInterfaceImplementation);

实现 FieldChangeListener 并将实现实例传递给 setChangeListener();

Answer 2

listField = new ListField() {
        protected boolean invokeAction(int action) {
        UiApplication.getUiApplication().invokeLater(new Runnable() {
           public void run() {

                    <** apply your code here **>                    

                    }
                });
                return true;
            };

            public void focusChangeNotify(int index) {
                mainlist = listField.getSelectedIndex();
                listField.invalidate();
                super.focusChangeNotify(index);
            };

            protected void onUnfocus() {
                mainlistflag = true;
                listField.invalidate();
                super.onUnfocus();
            };

            protected void onFocus(int direction) {

                mainlistflag = false;
                super.onFocus(direction);

            };
        };