For the More Curious: Accessing Theme Attributes

Once attributes are declared in your theme, you can access them in XML or in code.

To access a theme attribute in XML, you use the notation that you saw on the listSeparatorTextViewStyle attribute in Chapter 8. When referencing a concrete value in XML, such as a color, you use the @ notation. @color/gray points to a specific resource.

When referencing a resource in the theme, you use the ? notation:

    <Button xmlns:android=""
        android:background="?attr/colorAccent" tools:text="Sound name"/> ...

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