Using a suite of standard protocols, you can implement compelling accessories that extend Android capabilities in a wide range of Android-powered devices.
Android supports local on-device audio and remote off-device audio over a wired 3.5 mm headset jack, USB connection, or Bluetooth. Manufacturers should see the wired audio headset specification, while users can learn how to record and play back audio using USB host mode.
What do you want to connect to your Android device? Alarm clock? Keyboard? Thermostat? Robot? Learn how to connect existing equipment or your own unique hardware to Android using the Android Open Accessory (AOA) protocol.