USB媒体扫描(Enable media scanning on USB) 默认勾选android4.0/frameworks/base/packages/SettingsProvi
USB媒体扫描(Enable media scanning on USB) 默认勾选 android4.0/frameworks/base/packages/SettingsProvider/res/values/defaults.xml<bool name="def_is_scan_usb_host">true</bool>
