此系统是基于Android无线点菜，主要是登录、点菜、退菜等功能，还有一些娱乐功能-This system is based on the Android wireless order, mainly Log, a la carte, retreat dishes functionality, there are some entertainment features

这是关于如何使用android的组建fragment的，实现了点击底下的菜单完成fragment的切换-This is about how to use android formation fragment, and click on the bottom of the menu of the switch fragment