WIFI 背景扫描 流程及相关解释和技术细节-WIFI background scanning process and the related explanations and technical details

android探索周围wifi信号强度，并且记录在文件中，可用于构建wifi定位数据库-The android exploration around the wifi signal strength, and recorded in the file can be used to build a wifi location database

扫描周围的WiFi信息的信号强度，并用于室内定位(scan the rssi of wifi)