Probably not with the official usb api. I'm not sure if a port of libusb or something on that level may help.
Am Freitag, 20. September 2013 16:03:20 UTC+2 schrieb eli: > > How do I get an app to read data from a USB barcode reader if the > usbManager can't even detect that its there. > > On Thursday, September 19, 2013 3:55:19 PM UTC-4, eli wrote: > >> <http://stackoverflow.com/questions/18900666/android-usb-problems#> >> ** >> >> 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(); >> >> -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups "Android Developers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
