How do I create an Android calculator using numberpickers instead of buttons?

See more:

Mobile

Android

Hi. I would like to create an Android app that multiplies 2 numbers. Each number will need to be defined within a specific range. Example:

1st number range = .1, .2, .5, 1.25, 1.625
2nd number range = 0 to 100

To keep the UI simple, I would like to use 2 NumberPicker controls, a Calculate button, and a TextView.

Can anyone point me to a solid example? Thank you.