Android中USB相關的文件

a) frameworks/base/core/java/android/hardware/usb/*

Provides support to communicate with USB hardware peripherals that are connected to Android-powered devices.

https://developer.android.google.cn/reference/android/hardware/usb/package-summary.html

b) frameworks/base/libs/usb/*

獲取UsbManager和UsbAccessory類的一些實例。

c) frameworks/base/services/usb/*

Usb服務框架（重要）

d) frameworks/base/packages/SystemUI/src/com/android/systemui/usb/*

各種activity.

e) hardware/interfaces/usb/* （Android O 及以上版本）

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內容見 https://source.android.google.cn/reference/hidl/android/hardware/usb/1.0/IUsb

https://source.android.google.cn/devices/tech/config/usb-hal

f)kernel/driver/usb/*

內核驅動

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