原来试着用
getFromLocation(double latitude, double longitude, int maxResults) //Returns an array of Addresses that are known to describe the area immediately surrounding the given latitude and longitude.
但发现老是返回空值：http://blog.csdn.net/dadoneo/archive/2011/03/17/6255486.aspx
于是就采用了此种方案！
改天把代码贴上来：
严重参照了下面的链接：
http://code.google.com/intl/zh-CN/apis/maps/documentation/javascript/v2/services.html#ReverseGeocoding
http://www.smnirven.com/?p=39