wifi 默认扫描间隔时间:当驱动不支持Background扫描时,Framework将定时展开扫描工作,默认时间为300秒
base/core/res/res/values/config.xml
<integer translatable="false" name="config_wifi_framework_scan_interval">300000</integer>
mDefaultFrameworkScanIntervalMs = mContext.getResources().getInteger(R.integer.config_wifi_framework_scan_interval);