BlackBerry菜单项

Question

当用户按菜单项时按下屏幕的正确方法是什么？我正在以这种方式开发我的代码，但我不知道它是否正确：

    private MenuItem _descriptionItem = new MenuItem("Descripción",110, 10) {
    public void run() {
        int selectedIndex = _listField.getSelectedIndex();
        final Event event = (Event)_listElements.elementAt(selectedIndex);
        UiApplication.getUiApplication().invokeLater(new Runnable(){
            public void run(){
                Dialog.inform(event.getDescription());
            }
        });
    }
};

谢谢！

Answer 1

菜单项在事件线程上执行。所以你可以删除invokeLater代码。

 private MenuItem _descriptionItem = new MenuItem("Descripción",110, 10) {
    public void run() {
        int selectedIndex = _listField.getSelectedIndex();
        final Event event = (Event)_listElements.elementAt(selectedIndex);
        Dialog.inform(event.getDescription());
    }
};

Answer 2

private MenuItem MNU_BACK = new MenuItem（null，100000000,100）{                public void run（）{                     closeform（）;            }

         public String toString() {
                 return "BACK";
     }
  };

Answer 3

实际上已弃用：

private MenuItem _descriptionItem = new MenuItem("Descripción",110, 10) 
{
    public void run() {
        int selectedIndex = _listField.getSelectedIndex();
        final Event event = (Event)_listElements.elementAt(selectedIndex);
        Dialog.inform(event.getDescription());
    }
};

请改用：

private MenuItem _descriptionItem = new MenuItem(new StringProvider("Descripción"),110, 10)
{
    public void run() {
        int selectedIndex = _listField.getSelectedIndex();
        final Event event = (Event)_listElements.elementAt(selectedIndex);
        Dialog.inform(event.getDescription());
    }
};

使用菜单项时，这将避免编译器警告。