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This was one of the first questions I asked when I started working with Compose, and the answer I have arrived at is both yes and no. Hopefully, with a simple but concrete model of how the old system works, we can compare it with the new one. The purpose of showing you this XML file and what it turns into in a process (a process is simply a program that is running on a device), is to demonstrate how nested Views in an XML file translate into a nested View Hierarchy at runtime.
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The debugger and stepper tools are some of my favourite ways to learn about what is going on under the hood of the code that I use from various libraries. Memory Space of (Fragment)HourView.kt: Image of a View Hierarchy Then, using a debugger/stepper tool, we will look at what it looks like in the memory space of the Fragment which inflates this file: To illustrate this, let's look at such an XML file (there’s no need to study it closely, just note the names).
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For Web Developers, the View Hierarchy is essentially Android’s version of the Document Object Model (DOM).įor Android Developers, you can think of the View Hierarchy as a virtual representation of all the Views which you defined either in XML files or programmatically in Java or Kotlin. With that in mind, we get to the important part of this review of the View system: The View Hierarchy.
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And, while sharing most of the same kinds of information as a widget, they also contain information about how to arrange and display other Views which are nested within them. Such containers are commonly referred to as Layouts or Viewgroups depending on the context. It is important to understand that a View can be something like a button (commonly referred to as a “widget”), but it can also be a container of the whole screen, part of the screen, or for other child Views.
While I feel my article will stand on its own as an introduction to the basics of Jetpack Compose, I strongly suggest you read his articles once you have gained some practical experience with Compose (or right away if you prefer to learn that way).
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Leland is not only a Software Engineer working on the Jetpack Compose team, but I see that he is a great writer as well. While this is a beginner's guide to Compose, it will not be a beginner's guide to Android – so you should have built at least an application or two (though not in Compose, necessarily).īefore we begin, I was initially planning to write a follow up article directed towards more senior developers until I came across Leland Richardson’s two part article series. This tutorial will teach you a few fundamental concepts and terms related to the Jetpack Compose UI Library on Android.