In fact you can think of 2 “types” of theme you can use in your app: There are a number of handy theme overlays provided by MDC (and AppCompat) that you can use to flip the color of a subsection of your app from light to dark:īy definition, theme overlays don’t specify a number of things and shouldn’t be used in isolation e.g. Theme overlays are narrowly scoped themes, defining as few attributes as possible, designed to overlay another themeīy convention, we name these beginning with “ThemeOverlay”. Consider the following Button which species a theme, but who’s parent also specifies a theme: Setting a theme at any level in this tree doesn’t replace the theme currently in effect, it overlays it. setting a theme on a ViewGroup applies to all the Views within it (in contrast to styles which only apply to a single view). Specifying a theme at any level of this tree cascades to descendent nodes e.g. These objects exist in a tree, where an Activity contains ViewGroups which contain Views etc. ScopeĪ Theme is accessed as a property of a Context and can be obtained from any object which is or has a context e.g. Today we’ll focus on actually using themes, how they are applied to your app and the implications for how you build them. In previous articles in this series on Android styling, we’ve looked at the difference between styles and themes, talked about the benefits of using themes and theme attributes and highlighted some common attributes to use.
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