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Android Open Accessory API and Development Kit (ADK)

You have always been able to connect an Android device to your computer, but until now there was no way for Android applications to interact with other hardware via USB. In this talk we cover new support in Android 3.1 for USB input devices, as well as new APIs for applications to communicate with peripherals via USB. The APIs support both Android powered devices that act as a conventional USB host, and non-host Android devices that communicates with a new class of USB hosts known as "Android USB Accessories". Cool hardware is involved.

Check the Arduino demo together with Android half way down the youtube
Check also 37:25 in the Q&A session a question comes in about USB/Ethernet deivices which are uofficiale supported!

[youtube]http://www.youtube.com/watch?v=s7szcpXf ... r_embedded[/youtube]

google.com/events/io/2011/sessions/andr ... t-adk.html

I just watched the video (on my Android Honeycomb of course), cool !!

You can get Android Open Accessory compatible development boards at Modern Devices, which those who are familiar with Arduino stuff will probably know already:
http://shop.moderndevice.com/products/f ... host-board
And more shops can be found here:
http://developer.android.com/guide/topi ... k.html#top

I'd really love to get my hands on one of those boards!