@Peter Thanks for testing! One of my test phones is a G1, yes the prehistoric Android phone from when Android could only say "Danger Will Robinson!"
So you're guaranteed that the app will always support "them old geezers".
I use Google AppInventor. I wasn't going to tell anyone which development environment I use, as Google appinventor seemed like a not very serious toy-like devenv. But now that I've used it for a while, I must admit that it is very powerfull and comprehensive. And it will become more powerfull still, as it is still in it's infancy and new features are added each week.