用ViewGroup实现的...

效果图:

[img]http://dl2.iteye.com/upload/attachment/0090/9702/e950ad44-aa6b-3730-8ba3-6a17614b7c3b.jpg[/img]

[img]http://dl2.iteye.com/upload/attachment/0090/9704/2fb78d5d-136d-35dc-8316-f85460108f83.jpg[/img]

下面是代码的下载地址: