Arduino
Communicator
Client applications
Two examples of how to use the Arduino Communicator app for communicating with your Arduino.
Android-Arduino Blink:
http://www.basic4ppc.com/forum/basic4android-share-your-creations/23692-android-arduino-comms-usb-host.html#post137262
Arduino Communicator Client:
https://github.com/jeppsson/Arduino-Communicator-Client
Arduino Communicator Home.