The code is released under the GNU General Public License.
This is the source code for the Android application for the following example: https://github.com/felis/USB_Host_Shield_2.0/blob/master/examples/adk/ArduinoBlinkLED/ArduinoBlinkLED.ino.
It demonstrates how to send between an Arduino and an Android phone.
The code for the Android application is heavily based on this guide: http://allaboutee.com/2011/12/31/arduino-adk-board-blink-an-led-with-your-phone-code-and-explanation/ by Miguel.
This project is intended to be used with Android Studio and Gradle. See the following page for more information: http://developer.android.com/sdk/installing/studio.html.
For more information send me an email at kristianl@tkjelectronics.dk.