I'm shooting my arrow, but I already know where it'll land...
Is there out there in the Android market (by any recent miracle) a PDF reader application I can download to test a simple radio button or checkbox on a PDF? I know many forms of rich and interactive media are very limited on mobile, but a simple radio button or checkbox? Come on! Somebody's gotta have an app for that.
I have tested that Adobe Reader Supports AcroForm Field elements like checkboxes, listfields, textinput, combo boxes and also some scripting like send "form back as EMail" on iOS, I guess the Android version has the same functionality.
As far as I know it does not support XFA based PDF forms.