Random Generator 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. I want to make a horizontal number picker as shown in the image below: I tried using horizontal listview and pageview widgets but couldn't do it. I've even tried using some

number4d, Random Number Picker.