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Jetpack Compose is a modern declarative UI Toolkit for Android. Compose makes it easier to write and maintain your app UI by providing a declarative API that allows you to render your app UI without imperatively mutating frontend views.

The solution here is to provide item keys. Providing a stable key for each item lets Compose avoid unnecessary recompositions. In this case, Compose can see that the item now at spot 3 is the same item that used to be at spot 2. Since none of the data for that item has changed, Compose doesn't have to recompose it.

Modifiers allow you to decorate or augment a composable. Modifiers let you do these sorts of things: Change the composable's size, layout, behavior, and appearance. Add information, like accessibility labels. Process user input.

Composable functions can recompose, so they are not like standard functions, in the sense that they will not be called only once as part of a call stack. This is how a normal call stack would look. Each function gets called once, and it can call one or multiple other functions.

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.

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.

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.

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:

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.

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.