I have a sketch using the fisica library with "grabbable" objects that functions as expected in Java. It also runs on Android, but nothing is grabbable there.
I put this bit of code in just to test that touch events were registered at all:
void mousePressed(){
println(""+mouseX);
}
Indeed, I get x coordinates printed in the console.
My guess is that the touch event is mapped to a different method by Processing from Android, versus mouse click events from Java. So somehow I would need to bridge the gap to fisica's methods.