https://stuff.mit.edu/afs/sipb/project/android/docs/reference/android/hardware/usb/UsbManager.html
UsbManager - Android SDK | Android Developers
android sdkdevelopers
https://developer.android.google.cn/reference/android/hardware/usb/UsbManager?authuser=5
UsbManager | API reference | Android Developers
api referenceandroiddevelopers
https://developer.android.google.cn/reference/android/hardware/usb/UsbManager?authuser=0
UsbManager | API reference | Android Developers
api referenceandroiddevelopers
https://developer.android.com/reference/android/hardware/usb/UsbManager?authuser=2
UsbManager | API reference | Android Developers
api referenceandroiddevelopers