For each style or theme, add a element with a unique name and, optionally, a parent attribute. Create a file named styles.xml in the your application's res/values directory. 
Android provides some default style and theme resources that you can use, or you can declare your own custom style and theme resources. For example, you could define a theme that sets specific colors for the window frame and the panel foreground and background, and sets text sizes and colors for menus, then apply it to the activities of your application.
A theme is a set of one or more formatting attributes that you can apply as a unit to all activities in an application or just a single activity. For example, you could define a style that specifies a certain text size and color, then apply it to instances of a certain type of View element. A style is a set of one or more formatting attributes that you can apply as a unit to single elements in your layout XML file(s). When designing your application, you can use styles and themes to apply uniform formatting to its various screens and UI elements.
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