How should I name styles and Themes in Android

What is the convention for naming xml styles in Android.

I have seee things like

Widget.TextView.SpinnerItem 

and

开发者_如何学PythonTheme.Black

If I extend these in my own styles how should I name it?

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The styles can follow the following convention X style parent of Y then you should write Y.X

see Android UI best practices I have found out so far