[android-developers] How to read data from external device using android USB Host Api ?

Hello ,

I've written an app to connect an USB Device and read data from
external usb device to my android USB Host 3.1 root tab device.
i used http://developer.android.com/guide/topics/usb/host.html android
USB Host Api. But every time read data value got
zero value in every byte from external device.

can anyone send me demo or proper documentation how to read data from
external device ?
any encoding require for reading data ?

Thanks

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