Android doesn't do what it is told!?

Hi there,
here's my stuff: Arduino(1.0.5 IDE) Mega ADK board and Android 4.1.2 Sony Xperia Go with a wifi connection to the Internet.
Sketch intends to make the Android load an apk file from an internet site. On connecting to the Android a mensagem ia ndisplayed:
"No installed applications work with this USB accessory. Learn more about this accessory at ..." and a link is given tiven to the url of my apk file.
My Android is not rooted and is configured to allow 3rd party installation of apps.
I thought that the open accessory should be working on Android 4.1.2 or is my phone missing someting? Does anyone know how this problem can be solved?
All the best,
RA