说明：  基于安卓的天气查询的APP，实现的功能： 1、可以罗列出全国所有的省市县 2、可以查看任意城市天气 3、可以手动切换城市，查看其它地方天气 4、提供手动更新一集后台更新天气功能
(Based on the weather query APP Andrews, the functions: 1, you can list all the provincial cities and counties nationwide 2, 3 can view any city weather, you can manually switch the city to view weather elsewhere 4, to provide a set of manually update the background Weather update function)