Google official website of the sample for testing Arduino board USB interface is working properly. Including Android and Arduino-side code.

Demokit\.classpath
.......\.project
.......\.settings\org.eclipse.jdt.core.prefs
.......\Android.mk
.......\AndroidManifest.xml
.......\bin\AndroidManifest.xml
.......\...\classes\com\google\android\DemoKit\AccessoryController.class
.......\...\.......\...\......\.......\.......\BaseActivity.class
.......\...\.......\...\......\.......\.......\BuildConfig.class
.......\...\.......\...\......\.......\.......\ColorLEDController$LabelClickListener.class
.......\...\.......\...\......\.......\.......\ColorLEDController$LedValueUpdater.class
.......\...\.......\...\......\.......\.......\ColorLEDController.class
.......\...\.......\...\......\.......\.......\ColorWheel$OnColorChangedListener.class
.......\...\.......\...\......\.......\.......\ColorWheel.class
.......\...\.......\...\......\.......\.......\ColorWheelLEDController.class
.......\...\.......\...\......\.......\.......\DemoKitActivity$1.class
.......\...\.......\...\......\.......\.......\DemoKitActivity$2.class
.......\...\.......\...\......\.......\.......\DemoKitActivity$JoyMsg.class
.......\...\.......\...\......\.......\.......\DemoKitActivity$LightMsg.class
.......\...\.......\...\......\.......\.......\DemoKitActivity$SwitchMsg.class
.......\...\.......\...\......\.......\.......\DemoKitActivity$TemperatureMsg.class
.......\...\.......\...\......\.......\.......\DemoKitActivity.class
.......\...\.......\...\......\.......\.......\DemoKitLaunch.class
.......\...\.......\...\......\.......\.......\DemoKitPhone.class
.......\...\.......\...\......\.......\.......\DemoKitTablet.class
.......\...\.......\...\......\.......\.......\InputController$SwitchDisplayer.class
.......\...\.......\...\......\.......\.......\InputController.class
.......\...\.......\...\......\.......\.......\JoystickView.class
.......\...\.......\...\......\.......\.......\OutputController.class
.......\...\.......\...\......\.......\.......\R$attr.class
.......\...\.......\...\......\.......\.......\R$color.class
.......\...\.......\...\......\.......\.......\R$drawable.class
.......\...\.......\...\......\.......\.......\R$id.class
.......\...\.......\...\......\.......\.......\R$layout.class
.......\...\.......\...\......\.......\.......\R$string.class
.......\...\.......\...\......\.......\.......\R$style.class
.......\...\.......\...\......\.......\.......\R$styleable.class
.......\...\.......\...\......\.......\.......\R$xml.class
.......\...\.......\...\......\.......\.......\R.class
.......\...\.......\...\......\.......\.......\RelayController.class
.......\...\.......\...\......\.......\.......\ServoController.class
.......\...\.......\...\......\.......\.......\Slider$1.class
.......\...\.......\...\......\.......\.......\Slider$SliderPositionListener.class
.......\...\.......\...\......\.......\.......\Slider.class
.......\...\.......\...\......\.......\.......\UsbAccessoryActivity.class
.......\...\.......\...\......\.......\.......\Utilities.class
.......\...\.......\...\......\.......\.......\VerticalSlider.class
.......\...\classes.dex
.......\...\DemoKitLaunch.apk
.......\...\dexedLibs\annotations-e4f61c8d737b438b87068bf2af01f7eb.jar
.......\...\jarlist.cache
.......\...\res\drawable-hdpi\ic_launcher_demokit.png
.......\...\...\.............\indicator_button1_off_noglow.png
.......\...\...\.............\indicator_button1_on_noglow.png
.......\...\...\.............\indicator_button2_off_noglow.png
.......\...\...\.............\indicator_button2_on_noglow.png
.......\...\...\.............\indicator_button3_off_noglow.png
.......\...\...\.............\indicator_button3_on_noglow.png
.......\...\...\.............\indicator_button_capacitive_off_noglow.png
.......\...\...\.............\indicator_button_capacitive_on_noglow.png
.......\...\...\.............\joystick_background.png
.......\...\...\.............\joystick_normal_holo_dark.png
.......\...\...\.............\joystick_pressed_holo_dark.png
.......\...\...\.............\scrubber_control_holo_dark.png
.......\...\...\.............\scrubber_horizontal_blue_holo_dark.9.png
.......\...\...\.............\scrubber_horiz

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