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Compose allows you to do more with less code, compared to using the Android View system: Buttons, lists or animation - whatever you need to build, now there's less code to write.

Using Compose, you can build your user interface by defining a set of composable functions that take in data and emit UI elements. A simple example is a Greeting widget, which takes in a String and emits a Text widget which displays a greeting message.

Recomposition is when Jetpack Compose re-executes the composables that may have changed in response to state changes, and then updates the Composition to reflect any changes. A Composition can only be produced by an initial composition and updated by recomposition.

In this article, we explored the concepts of composition and recomposition in Android Jetpack Compose. We learned that composition involves combining smaller UI components using composable functions to create complex user interfaces in a modular and reusable manner.

To create a new project that has Compose setup correctly, proceed as follows: If you're in the Welcome to Android Studio window, click Start a new Android Studio project. ... In the Select a Project Template window, select Empty Compose Activity and click Next. In the Configure your project window, do the following:

You place the Canvas in your layout the same way you would with any other Compose UI element. Within the Canvas , you can draw elements with precise control over their style and location. Note: Under the hood, Compose relies on the view-based UI's Canvas and other associated objects.

The state variable is used to trigger recomposition. Recomposition is essential in Jetpack Compose because Kotlin files are prioritized over XML files. Many Android developers compare the recomposition process to a donut to simplify how it works; a donut has a hole in the center, which is seen as the scope.