![]() In a real app, they should be added as string resources in the strings.xml file and referenced using Compose's stringResource API. You'll hardcode all strings inline in snippets.In a production app, however, files should be logically structured in subpackages. You can add all Kotlin files in the root package of the app module.Key idea: State determines what is shown in the UI at any particular time. The scroll position in a list of items.The most recent messages received in a chat app.A few examples of state in Android apps are: This is a very broad definition and encompasses everything from a Room database to a variable in a class.Īll Android apps display state to the user. Īn app's "state" is any value that can change over time. Warning: The project's name is BasicStateCodelab. During the codelab, you are presented with snippets of code that you need to add to your project. We recommend that you follow the codelab step by step at your own pace and check the solution if you need help. You'll find the solution code in the BasicStateCodelab project. You can get the solution code for the BasicStateCodelab from GitHub: $ git clone Īlternatively you can download the repository as a Zip file. The and app/ files contain options and dependencies needed for Compose.The AndroidManifest.xml file, which defines your app's permissions, components, and custom resources.A MainActivity class configured with a composable function that displays some text on the screen.When you choose the Empty Compose Activity template, Android Studio sets up the following for you in your project: Note: For more information about setting up Compose with an empty activity or adding it to an existing project, check out the Compose Setup documentation. Make sure you select a minimumSdkVersion of at least API level 21, which is the minimum API Compose supports. Click Next and configure your project, calling it " BasicStateCodelab".For a new project, choose Empty Activity from the available templates.If you already have an Android Studio project open, select File > New > New Project from the menu bar. If you're in the Welcome to Android Studio window, click Start a new Android Studio project.To start a new Compose project, open Android Studio.A list of wellness tasks to do throughout the day.įor more support as you're walking through this codelab, check out the following code-along:.A water counter to track your water intake. ![]() You will implement a simple Wellness app: We will be doing a full recap of State in this codelab. ![]() Follow the Jetpack Compose basics codelab before this codelab.How to work with lists and state: using the mutableStateListOf and toMutableStateList APIs.How memory and internal state work in a composable function: using the remember and rememberSaveable APIs.How Compose automatically tracks state with the State API.How stateful and stateless composable functions work.How Compose uses state to determine which elements to display on the screen.How to think about state and events in a Jetpack Compose UI.Basic understanding of Architecture Component's ViewModel.Basic understanding of Compose (you can start with the Jetpack Compose tutorial).It shows you how the app's state determines what is displayed in the UI, how Compose updates the UI when state changes by working with different APIs, how to optimize the structure of our composable functions, and using ViewModels in a Compose world. ![]() This codelab explains the core concepts related to using State in Jetpack Compose.
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