Best Random Number Picker Generator

number picker This answer changes color of all fields of number picker, I mean color of unselected fields will change, too. But what if I want to change just selected field?!. The Random Number Picker.

number picker, I added a NumberPicker to my layout and debugged my app. Now I see that the NumberPicker doesn´t work, I can´t see any + or - button and also when I click on a number on my.