I found 2 built-in NumberPickers:
(source: techbooster.org)
By default, it's the first one, but when I add android:theme="@android:style/Theme.NoTitleBar"
in AndroidManifest.xml, it becomes the second one.
How can I put this line (I need it) and still get the first NumberPicker?
you are setting the non holo theme so you get the non holo numberpicker.
see this as reference, its basically the same thing you asked