Accessory Development Kit

The Accessory Development Kit (ADK) is a reference implementation for hardware manufacturers and hobbyists to use as a starting point for building accessories for Android. Each ADK release is provided with source code and hardware specifications to make the process of developing your own accessories easier. Creating new and alternative hardware based on the ADK is encouraged!

Android accessories can be audio docking stations, exercise machines, personal medical testing devices, weather stations, or any other external hardware device that adds to the functionality of Android.

Accessories use the Android Open Accessory (AOA) protocol to communicate with Android devices, over USB cable or through a Bluetooth connection. If you are building an accessory for Android devices, make sure you review the information below to understand about how to implement the AOA protocol.

The following sections provide more information about the Android Accessory Development Kits, how to use them, and how to get started building your own accessories for Android.

ADK 2012 Guide
Guide to getting started with the ADK released at Google I/O 2012.
ADK 2011 Guide
Guide to getting started with the original ADK, released at Google I/O 2011.
Android Open Accessory Protocol
Guide to implementing the Android Open Accessory Protocol.
Android Open Accessory Protocol 2.0
A description and guide to implementing the extended Android Open Accessory Protocol which supports audio dock accessories.