First two characters 0x tell the compiler that this is a hexadecimal number.Since ARGB Hex is just a bunch of jargon to describe what the heck " 0XFF00bc00" means, let me translate: You can either use a predefined value like Color.Black or supply your own ARGB Hex value. Example of light and dark color schemes.Ĭreate a file called something like Color.kt (the name does not matter) and fill it with immutable values: import .graphics.Color If you plan to support light and dark app themes (explained shortly), try to select a color scheme which supports white text and a color scheme which supports black text. If you have not already decided upon a color scheme for your application, I suggest that you use the various resources available on the official Material Design website. How to Replace Colors.xml Resources with Kotlin Compose I have structured it in the order I follow when writing this code in a new App. In simple terms, this means much less boilerplate code, and much more control at runtime.įor the practical part of this article, my suggestion to you is to follow this process in the order I explain it. Since we will be doing that work in Kotlin, it means one very important thing: Both we and the platform developers are much less bound by translation (compilation) and API bridges (Android's R class and Context) between XML and the JVM. I said I would keep this practical, but allow one point. With our review of the old system out of the way, let's explore a much prettier and simpler way to style and theme an Android application. How to Set Up Themes, Colors, and Fonts with Jetpack Compose Not to mention the main API for getting these resources is Context, which is a class you really do not want to leak in memory.Įnter Jetpack Compose. The result for us application developers is most often a lot of boilerplate code, some hacky workarounds for things which intuitively seem like they should be one-liners. Add that they must also try to have new features work on older Android OS versions, and that becomes a very thankless job. The root problem for everyone involved is tight coupling to the View system and the Android resource system (which are themselves tightly coupled together).įor the platform developers, this means they have to build on top of, or work around gigantic and old codebases. I have to write some ridiculous boilerplate code just to change the look of a View (that is, override something defined within resource styles and themes).I want access to a resource in a place where I do not want tight coupling to the platform APIs which provide the resource.This can present difficulties for both platform and application developers. In order to integrate our XML-based resources into our JVM-based application code, we must necessarily have layers of translation (compilation) and platform bridges (APIs). It is merely an observation of how design decisions always have benefits and costs. Please note that this is not meant as a criticism of the platform developers/engineers. ![]() Personal preference aside, there is a more technical reason why XML resources are not always ideal. In fact, there are very few things I would prefer to do in XML over a modern, idiomatic, and elegant language such as Kotlin or Swift. While I would never want to manage the boilerplate code necessary for localized string resources myself, that does not mean I enjoy writing XML. This saves us having to write that boilerplate code ourselves. The resource system gives us a place where app developers can provide localized resources which the platform can select for at compile time. Those are just two common examples – there are plenty more.
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