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i need functionality like..connect android device to external usb device using RS232 interface.
also receiving / fetching data from external USB device to my application. this type functionality possible in android ? which step follows for this type of functionality ?
Not directly: however, this will probably let you do what you want.
http://www.sparkfun.com/products/10585
Its a combination USB host controller and Android API that uses the ADB protocol to pass data. Alternatively, you can also look at this:
http://code.google.com/p/microbridge/
Which needs an Arduino and doesn’t appear to be that cleanly integrated but should also do what you want.