<http://stackoverflow.com/questions/18900666/android-usb-problems#>
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I have a tablet, an OTG cable and a barcode reader. I know this works
because when I start the Google app I can scan barcodes and see them on the
screen.
I created a very simple application that starts the USB manager and checks
how many devices are attached.
When I have a memory flash stick in the OTG cable the program shows 1.
(correct)
When I have a mouse in the OTG cable it shows 0. (why)
Interesting observation. When I connect the mouse to the OTG cable it works
fine. I use it to click on the button to ask the usbManager how many
devices are attached and the response is 0.
When I attach a barcode reader to the OTG cable, the application goes
through onDestroy() and then shows 0. (Why does this happen)
Basics of my program developed using Eclipse:
In onCreate() I have:
usbManager = (UsbManager)getSystemService(Context.USB_SERVICE);
In onClick() I have (there is a button on the screen):
Map<String, UsbDevice> usbDeviceList =
sbManager.getDeviceList();Toast.makeText(this, String.format("Number of devices
= %d", usbDeviceList.size()), Toast.LENGTH_SHORT).show();
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