I have now come pretty far with my first application, see attached.
This has been done with much help from Klaus.
I do however have difficulties to get the keyboard to go away after inputting the diameter value.
I would like the keyboard to disappear after pressing ENTER
I just tried your app on my tablet and after I enter a number and press Done on the keyboard, it already goes away by itself.
If you want the keyboard to go away when the user presses your Calculate key instead of the keyboard's Done key, then enter the code I gave you into the btnCalculate_Click sub
The latest version is part of Basic4android v1.6. If you like, send me an email and I'll send you the updated phone library. Note that it is not fully compatible with B4A v1.5.