You would need to get the RadEntry used inside the NumericInput control and create a custom renderer on Android for it where you could hide the keyboard.
I've created a sample project to show you how exactly this would work. First, in order to get the entry, you would need to modify the ControlTemplate of the NumericInput.
Inside the ControlTemplate replaced the NumericInputEntry with a custom one which type is used to export a renderer on Android.
Inside the renderer you could handle GotFocus event and hide the keyboard in it. In addition, our Entry has some specifics related to styling its border, that's why creating a new natice control is needed.
Please download the attached file and give it a try. Let me know if any additional questions arise.
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