I've been using qPDF on Androids, and most recently, we are using it on a Nexus 10. I created a form with some javascript calculations and validations. The form works great in native Adobe on the desktop, and also works perfectly on an iPad using PDF Expert (not Adobe Reader).
qPDF crashes, though, or simply won't implement parts of the code:
1. check boxes. I have checkbox fields that autopopulate with checks when a condition in another field is true. qPDF (or maybe Android) does not seem to display the check boxes.
2. as a test, instead of check boxes, I simply used text fields that get populated with the letter "x". In qPDf, the x's start to appear, then the form crashes (the app actually closed down).
Let me know if you want to see any of the code, would be glad to post it. In summary, PDF Expert has provided far more javascript support, but unfortunately, only for iOS, not Android.
Thanks for your consideration.