NumberPickers before API 11

As you may know, Android has a NumberPicker but this NumberPicker is only available for API 11 (HoneyComb) or newer. The workaround for using a number picker is to implement your own Widget Library.

Here is a list of Widget Libraries that you should use:

SimonVT’s NumberPicker(Personally Used):
Michael Novak’s NumberPicker (He also has a demo and a guide on his website):

These two come highly recommended:
Android Wheel:
Horizontal slider widget:

Once you include these files into your project; you can implement the NumberPicker like any regular widget in xml files or dynamically.