Android 3.1 has Android Open Accessory Development Kit Support

The Android 3.1 platform (also backported to Android 2.3.4) introduces Android Open Accessory Development Kit support, which allows external USB hardware to interact with an Android-powered device in a special "accessory" mode. When an Android-powered powered device is in accessory mode, the connected accessory acts as the USB host and the Android-powered device acts as the device.

Android USB accessories are specifically designed to attach to Android-powered devices and adhere to a simple Android accessory protocol that allows them to detect Android-powered devices that support accessory mode.

Android Open Accessory support overcomes this limitation and allows you to build accessories that can interact with an assortment of Android-powered devices by allowing the accessory initiate the connection.

For more information, visit link: http://developer.android.com/guide/topics/usb/adk.html

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