This app has been released into the Android Play store. You can get it here
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Create a Directory "LibraryProjects" outside the app directory and clone following github repositories https://github.com/SimonVT/android-numberpicker.git
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Also add google play services as a dependency on the project. Steps to do so, listed here https://docs.google.com/document/pub?id=19nQzvKP-CVLd7_VrpwnHfl-AE9fjbJySowONZZtNHzw