有多少usb设备连接到Android Raspbery Pi 3？

Question

I'm using Android Raspberry Pi 3 and I want to know how many USB devices connected to it. I know how do do it for camera devices:

Log.d(TAG, "how many camera device? -->" + Camera.getNumberOfCameras());

but I don't know how determine many other USB devices connected to it.

Thanks.

Answer 1

As specified in Andoid USB Host guide , you can enumerate USB host devices with :

UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);

HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
Log.v(TAG, "There are : " + deviceList.size() + " USB devices connected");

You can iterate them with :

Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
while(deviceIterator.hasNext()){
    UsbDevice device = deviceIterator.next();

}