一堆什么烂机子都得做扩展机型……尤其是MIDP1.0的，不支持全屏，只好往上安Command，结果真机和模拟器还不一样
真机不行：
cmdBack = new Command("返回",Command.BACK,1);
cmdSelect = new Command("选择",Command.ITEM,1);
cmdCancel = new Command("取消",Command.BACK,1);
真机行：
cmdBack = new Command("返回",Command.ITEM,2);
cmdSelect = new Command("选择",Command.ITEM,1);
cmdCancel = new Command("取消",Command.ITEM,2);
