Kotlin and Android | Android Developers

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class="devsite-landing-row-item" description-position="bottom" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <picture> <source class="devsite-dark-theme" srcset="https://developer.android.com/static/images/cluster-illustrations/kotlin-hero_dt.svg" media="(prefers-color-scheme: dark)" alt="" sizes="(max-width: 600px) 100vw, (max-width: 840px) 50vw, 708px" fetchpriority="high"> <img alt="" src="https://developer.android.com/static/images/cluster-illustrations/kotlin-hero.svg" srcset="https://developer.android.com/static/images/cluster-illustrations/kotlin-hero.svg" sizes="(max-width: 600px) 100vw, (max-width: 840px) 50vw, 708px" fetchpriority="high"> </picture> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="develop-android-apps-with-kotlin" data-text="Develop Android apps with Kotlin" class="hide-from-toc no-link" tabindex="0"> Develop Android apps with Kotlin </h3> <div class="devsite-landing-row-item-description-content"> Write better Android apps faster with Kotlin. Kotlin is a modern statically typed programming language used by over 60% of professional Android developers that helps boost productivity, developer satisfaction, and code safety. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/kotlin/first" class="button button-primary " >Get started</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-4-up devsite-landing-row-padding-xlarge android-value-props" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/picto-icons/code_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/picto-icons/code.svg" srcset="https://developer.android.com/static/images/picto-icons/code.svg" sizes="64px" loading="lazy" > </picture> </div> <div class="devsite-landing-row-item-body"> <h3 id="expressive-and-concise" data-text="Expressive and concise" class="hide-from-toc no-link" tabindex="0"> Expressive and concise </h3> <div class="devsite-landing-row-item-description-content"> Kotlin's modern language features allow you to focus on expressing your ideas and write less boilerplate code. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/kotlin/learn" class="button button-white " >Learn more</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/picto-icons/actionable_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/picto-icons/actionable.svg" srcset="https://developer.android.com/static/images/picto-icons/actionable.svg" sizes="64px" loading="lazy" > </picture> </div> <div class="devsite-landing-row-item-body"> <h3 id="safer-code" data-text="Safer code" class="hide-from-toc no-link" tabindex="0"> Safer code </h3> <div class="devsite-landing-row-item-description-content"> With nullability included in its type system, Kotlin helps you avoid NullPointerExceptions. Android apps that use Kotlin are 20% less likely to crash. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/kotlin/learn#null-safety" class="button button-white " >Learn more</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/spot-icons/jetpack-compose_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/spot-icons/jetpack-compose.svg" srcset="https://developer.android.com/static/images/spot-icons/jetpack-compose.svg" sizes="64px" loading="lazy" > </picture> </div> <div class="devsite-landing-row-item-body"> <h3 id="jetpack-compose" data-text="Jetpack Compose" class="hide-from-toc no-link" tabindex="0"> Jetpack Compose </h3> <div class="devsite-landing-row-item-description-content"> Android's modern UI toolkit is built on Kotlin, allowing you to create UI quickly with powerful and intuitive APIs. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/jetpack/compose" class="button button-white " >Learn more</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/picto-icons/sync-2_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/picto-icons/sync-2.svg" srcset="https://developer.android.com/static/images/picto-icons/sync-2.svg" sizes="64px" loading="lazy" > </picture> </div> <div class="devsite-landing-row-item-body"> <h3 id="structured-concurrency" data-text="Structured concurrency" class="hide-from-toc no-link" tabindex="0"> Structured concurrency </h3> <div class="devsite-landing-row-item-description-content"> Kotlin coroutines streamline asynchronous programming, making common tasks like network calls and database updates simple and performant. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/kotlin/coroutines" class="button button-white " >Learn more</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-padding-xlarge" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-html"> <hr> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-4-up android-grouped-resources-primary" header-position="left" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" icon-position="top" > <div class="devsite-landing-row-header-icon-container" size="large" > <picture> <source class="devsite-landing-row-header-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/picto-icons/flag_dt.svg" sizes="100vw" loading="lazy" > <img class="devsite-landing-row-header-icon" alt="" src="https://developer.android.com/static/images/picto-icons/flag.svg" srcset="https://developer.android.com/static/images/picto-icons/flag.svg" sizes="100vw" loading="lazy" > </picture> </div> <div class="devsite-landing-row-header-text"> <h2 id="getting-started" data-text="Getting started" tabindex="0"> Getting started </h2> </div> </header> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <div class="devsite-landing-row-item-labels"> <span class=" " >getting started</span> </div> <h3 id="learning-android-kotlin-from-scratch" data-text="Learning Android & Kotlin from scratch" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.android.com/courses/android-basics-compose/course"> Learning Android & Kotlin from scratch </a> </h3> <div class="devsite-landing-row-item-description-content"> View our guides for beginners, teaching you how to build Android apps with Kotlin and Jetpack Compose. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <div class="devsite-landing-row-item-labels"> <span class=" " >getting started</span> </div> <h3 id="kotlin-for-android-java-developers" data-text="Kotlin for Android Java developers" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.android.com/kotlin/add-kotlin"> Kotlin for Android Java developers </a> </h3> <div class="devsite-landing-row-item-description-content"> If you already know Java, our interop guides and documentation can help you get started. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <div class="devsite-landing-row-item-labels"> <span class=" " >getting started</span> </div> <h3 id="advanced-kotlin-guides" data-text="Advanced Kotlin guides" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.android.com/kotlin/coroutines"> Advanced Kotlin guides </a> </h3> <div class="devsite-landing-row-item-description-content"> If you’re already familiar with Kotlin, read our advanced documentation to increase your skills. </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <div class="devsite-landing-row-item-labels"> <span class=" " >getting started</span> </div> <h3 id="bringing-kotlin-to-your-team" data-text="Bringing Kotlin to your team" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.android.com/kotlin/adopt-for-large-teams"> Bringing Kotlin to your team </a> </h3> <div class="devsite-landing-row-item-description-content"> Learn how writing in Kotlin can boost your team’s productivity, improve app quality, and increase developer satisfaction. </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-2-up devsite-landing-row-no-image-background android-promo" header-position="top" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="featured-courses" data-text="Featured courses" tabindex="0"> Featured courses </h2> </div> </header> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item" description-position="left" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <a href="https://developer.android.com/courses/kotlin-bootcamp/overview"> <picture> <img alt="" src="https://developer.android.com/static/images/kotlin/learn/featured1.svg" srcset="https://developer.android.com/static/images/kotlin/learn/featured1.svg" sizes="(max-width: 600px) 100vw, (max-width: 840px) 50vw, 708px" loading="lazy" > </picture> </a> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <div class="devsite-landing-row-item-labels"> <span class=" " >Featured</span> </div> <h3 id="kotlin-bootcamp-for-programmers" data-text="Kotlin Bootcamp for programmers" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.android.com/courses/kotlin-bootcamp/overview"> Kotlin Bootcamp for programmers </a> </h3> <div class="devsite-landing-row-item-description-content"> In the Kotlin Bootcamp for programmers course, you learn the basics of Kotlin as you create various small programs in IntelliJ IDEA. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/courses/kotlin-bootcamp/overview" class="button " >Start course</a> </div> </div> </div> </div> <div class="devsite-landing-row-item" description-position="left" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <a href="https://developer.android.com/codelabs/advanced-kotlin-coroutines"> <picture> <img alt="" src="https://developer.android.com/static/images/kotlin/learn/icon4.svg" srcset="https://developer.android.com/static/images/kotlin/learn/icon4.svg" sizes="(max-width: 600px) 100vw, (max-width: 840px) 50vw, 708px" loading="lazy" > </picture> </a> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <div class="devsite-landing-row-item-labels"> <span class=" " >Featured</span> </div> <h3 id="advanced-coroutines-with-kotlin-flow-and-livedata" data-text="Advanced Coroutines with Kotlin Flow and LiveData" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.android.com/codelabs/advanced-kotlin-coroutines"> Advanced Coroutines with Kotlin Flow and LiveData </a> </h3> <div class="devsite-landing-row-item-description-content"> Learn how to use LiveData with Kotlin Coroutines and Flow. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/codelabs/advanced-kotlin-coroutines" class="button " >Start Codelab</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-4-up devsite-landing-row-padding-xlarge android-value-props" header-position="top" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="optimized-for-kotlin" data-text="Optimized for Kotlin" tabindex="0"> Optimized for Kotlin </h2> <div class="devsite-landing-row-description"> Kotlin is fully supported for Android development with tools and resources to help you succeed. </div> </div> </header> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/spot-icons/android-studio_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/spot-icons/android-studio.svg" srcset="https://developer.android.com/static/images/spot-icons/android-studio.svg" sizes="64px" loading="lazy" > </picture> </div> <div class="devsite-landing-row-item-body"> <h3 id="android-studio" data-text="Android Studio" class="hide-from-toc no-link" tabindex="0"> Android Studio </h3> <div class="devsite-landing-row-item-description-content"> Android Studio provides first-class support for Kotlin. It even has built-in tools to help you convert Java-based code to Kotlin. The Show Kotlin Bytecode tool lets you to see the equivalent Java-based code as you learn Kotlin. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/studio" class="button button-white " >Download</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/picto-icons/android-ktx_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/picto-icons/android-ktx.svg" srcset="https://developer.android.com/static/images/picto-icons/android-ktx.svg" sizes="64px" loading="lazy" > </picture> </div> <div class="devsite-landing-row-item-body"> <h3 id="android-ktx" data-text="Android KTX" class="hide-from-toc no-link" tabindex="0"> Android KTX </h3> <div class="devsite-landing-row-item-description-content"> Android KTX makes Android development with Kotlin more concise, pleasant, and idiomatic by leveraging Kotlin language features. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/kotlin/ktx" class="button button-white " >Learn more</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/picto-icons/kotlin-friendly-sdk_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/picto-icons/kotlin-friendly-sdk.svg" srcset="https://developer.android.com/static/images/picto-icons/kotlin-friendly-sdk.svg" sizes="64px" loading="lazy" > </picture> </div> <div class="devsite-landing-row-item-body"> <h3 id="kotlin-friendly-sdk" data-text="Kotlin-friendly SDK" class="hide-from-toc no-link" tabindex="0"> Kotlin-friendly SDK </h3> <div class="devsite-landing-row-item-description-content"> Starting with Android 9 (API level 28), the Android SDK contains nullability annotations to help avoid NullPointerExceptions. API reference documentation is also available in Kotlin. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/reference/kotlin" class="button button-white " >See documentation</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <div class="devsite-landing-row-item-icon-container" size="medium" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/picto-icons/learning-resources_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/picto-icons/learning-resources.svg" srcset="https://developer.android.com/static/images/picto-icons/learning-resources.svg" sizes="64px" loading="lazy" > </picture> </div> <div class="devsite-landing-row-item-body"> <h3 id="learning-resources" data-text="Learning resources" class="hide-from-toc no-link" tabindex="0"> Learning resources </h3> <div class="devsite-landing-row-item-description-content"> Explore a curated set of resources in various formats to help you jumpstart learning Kotlin. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/kotlin/getting-started-resources" class="button button-white " >See resources</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-1-up" header-position="top" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="what-does-kotlin-code-look-like" data-text="What does Kotlin code look like?" tabindex="0"> What does Kotlin code look like? </h2> </div> </header> </div> </section> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-padding-xlarge" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-html"> <picture> <source srcset="https://developer.android.com/static/images/kotlin/code-samples/code-sample-newlarge.svg" media="(min-width: 1000px)"> <source srcset="https://developer.android.com/static/images/kotlin/code-samples/code-sample-newmedium.svg" media="(min-width: 720px) and (max-width: 1000px)"> <img alt="Nullable and NonNull types help reduce NullPointerExceptions, lambdas can be used for concise event handling code, template expressions can be used in strings to avoid concatenation and semicolons are optional." src="/static/images/kotlin/code-samples/code-sample-newsmall.svg"> </picture> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-large-headings devsite-landing-row-75 devsite-landing-row-padding-xlarge android-row-padding-top-xlarge-bottom-small android-section-intro-full-width" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="apps-built-with-kotlin" data-text="Apps built with Kotlin" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.android.com/kotlin/stories"> Apps built with Kotlin </a> </h3> <div class="devsite-landing-row-item-description-content"> Many apps are already built with Kotlin—from the hottest startups to Fortune 500 companies. Learn how Kotlin has helped their teams become more productive and write higher quality apps. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/kotlin/stories" class="button " >See developer stories</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-100 devsite-landing-row-padding-xlarge" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media dac-app-list" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <ul class="devsite-landing-row-item-list"> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.Slack"> <img alt="Slack" src="/static/images/kotlin/apps/slack.png" srcset="https://developer.android.com/static/images/kotlin/apps/slack.png 1x,https://developer.android.com/static/images/kotlin/apps/slack_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=me.lyft.android"> <img alt="Lyft" src="/static/images/kotlin/apps/lyft.png" srcset="https://developer.android.com/static/images/kotlin/apps/lyft.png 1x,https://developer.android.com/static/images/kotlin/apps/lyft_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.robinhood.android"> <img alt="Robinhood" src="/static/images/kotlin/apps/robinhood.png" srcset="https://developer.android.com/static/images/kotlin/apps/robinhood.png 1x,https://developer.android.com/static/images/kotlin/apps/robinhood_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.evernote"> <img alt="Evernote" src="/static/images/kotlin/apps/evernote.png" srcset="https://developer.android.com/static/images/kotlin/apps/evernote.png 1x,https://developer.android.com/static/images/kotlin/apps/evernote_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.squareup"> <img alt="Square" src="/static/images/kotlin/apps/square.png" srcset="https://developer.android.com/static/images/kotlin/apps/square.png 1x,https://developer.android.com/static/images/kotlin/apps/square_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.deliveroo.orderapp"> <img alt="Deliveroo" src="/static/images/kotlin/apps/deliveroo.png" srcset="https://developer.android.com/static/images/kotlin/apps/deliveroo.png 1x,https://developer.android.com/static/images/kotlin/apps/deliveroo_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.dropbox.android"> <img alt="Dropbox" src="/static/images/kotlin/apps/dropbox.png" srcset="https://developer.android.com/static/images/kotlin/apps/dropbox.png 1x,https://developer.android.com/static/images/kotlin/apps/dropbox_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.instacart.client"> <img alt="Instacart" src="/static/images/kotlin/apps/instacart.png" srcset="https://developer.android.com/static/images/kotlin/apps/instacart.png 1x,https://developer.android.com/static/images/kotlin/apps/instacart_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.pinterest"> <img alt="Pinterest" src="/static/images/kotlin/apps/pinterest.png" srcset="https://developer.android.com/static/images/kotlin/apps/pinterest.png 1x,https://developer.android.com/static/images/kotlin/apps/pinterest_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.basecamp.bc3"> <img alt="Basecamp" src="/static/images/kotlin/apps/basecamp.png" srcset="https://developer.android.com/static/images/kotlin/apps/basecamp.png 1x,https://developer.android.com/static/images/kotlin/apps/basecamp_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.ideashower.readitlater.pro"> <img alt="Pocket" src="/static/images/kotlin/apps/pocket.png" srcset="https://developer.android.com/static/images/kotlin/apps/pocket.png 1x,https://developer.android.com/static/images/kotlin/apps/pocket_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.reddit.frontpage"> <img alt="Reddit" src="/static/images/kotlin/apps/reddit.png" srcset="https://developer.android.com/static/images/kotlin/apps/reddit.png 1x,https://developer.android.com/static/images/kotlin/apps/reddit_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=vStudio.Android.Camera360"> <img alt="Camera360" src="/static/images/kotlin/apps/camera360.png" srcset="https://developer.android.com/static/images/kotlin/apps/camera360.png 1x,https://developer.android.com/static/images/kotlin/apps/camera360_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.trello"> <img alt="Trello" src="/static/images/kotlin/apps/trello.png" srcset="https://developer.android.com/static/images/kotlin/apps/trello.png 1x,https://developer.android.com/static/images/kotlin/apps/trello_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.joelapenna.foursquared"> <img alt="Foursquare" src="/static/images/kotlin/apps/foursquare.png" srcset="https://developer.android.com/static/images/kotlin/apps/foursquare.png 1x,https://developer.android.com/static/images/kotlin/apps/foursquare_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.duolingo"> <img alt="Duolingo" src="/static/images/kotlin/apps/duolingo.png" srcset="https://developer.android.com/static/images/kotlin/apps/duolingo.png 1x,https://developer.android.com/static/images/kotlin/apps/duolingo_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.americanexpress.android.acctsvcs.us"> <img alt="Amex" src="/static/images/kotlin/apps/amex.png" srcset="https://developer.android.com/static/images/kotlin/apps/amex.png 1x,https://developer.android.com/static/images/kotlin/apps/amex_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.expedia.bookings"> <img alt="Expedia" src="/static/images/kotlin/apps/expedia.png" srcset="https://developer.android.com/static/images/kotlin/apps/expedia.png 1x,https://developer.android.com/static/images/kotlin/apps/expedia_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.netflix.mediaclient"> <img alt="Netflix" src="/static/images/kotlin/apps/netflix.png" srcset="https://developer.android.com/static/images/kotlin/apps/netflix.png 1x,https://developer.android.com/static/images/kotlin/apps/netflix_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.amazon.kindle"> <img alt="Kindle" src="/static/images/kotlin/apps/kindle.png" srcset="https://developer.android.com/static/images/kotlin/apps/kindle.png 1x,https://developer.android.com/static/images/kotlin/apps/kindle_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.kii.safe"> <img alt="Keepsafe" src="/static/images/kotlin/apps/keepsafe.png" srcset="https://developer.android.com/static/images/kotlin/apps/keepsafe.png 1x,https://developer.android.com/static/images/kotlin/apps/keepsafe_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.nytimes.android"> <img alt="NYTimes" src="/static/images/kotlin/apps/nytimes.png" srcset="https://developer.android.com/static/images/kotlin/apps/nytimes.png 1x,https://developer.android.com/static/images/kotlin/apps/nytimes_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.teslacoilsw.launcher"> <img alt="Nova Launcher" src="/static/images/kotlin/apps/nova-launcher.png" srcset="https://developer.android.com/static/images/kotlin/apps/nova-launcher.png 1x,https://developer.android.com/static/images/kotlin/apps/nova-launcher_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=org.wordpress.android"> <img alt="Wordpress" src="/static/images/kotlin/apps/wordpress.png" srcset="https://developer.android.com/static/images/kotlin/apps/wordpress.png 1x,https://developer.android.com/static/images/kotlin/apps/wordpress_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.banksimple"> <img alt="Simple" src="/static/images/kotlin/apps/simple.png" srcset="https://developer.android.com/static/images/kotlin/apps/simple.png 1x,https://developer.android.com/static/images/kotlin/apps/simple_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.twitter.android"> <img alt="Twitter" src="/static/images/kotlin/apps/twitter.png" srcset="https://developer.android.com/static/images/kotlin/apps/twitter.png 1x,https://developer.android.com/static/images/kotlin/apps/twitter_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.airbnb.android"> <img alt="Airbnb" src="/static/images/kotlin/apps/airbnb.png" srcset="https://developer.android.com/static/images/kotlin/apps/airbnb.png 1x,https://developer.android.com/static/images/kotlin/apps/airbnb_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=flipboard.app"> <img alt="Flipboard" src="/static/images/kotlin/apps/flipboard.png" srcset="https://developer.android.com/static/images/kotlin/apps/flipboard.png 1x,https://developer.android.com/static/images/kotlin/apps/flipboard_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.foursquare.robin"> <img alt="Foursquare Swarm" src="/static/images/kotlin/apps/foursquare-swarm.png" srcset="https://developer.android.com/static/images/kotlin/apps/foursquare-swarm.png 1x,https://developer.android.com/static/images/kotlin/apps/foursquare-swarm_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.tencent.mm"> <img alt="WeChat" src="/static/images/kotlin/apps/wechat.png" srcset="https://developer.android.com/static/images/kotlin/apps/wechat.png 1x,https://developer.android.com/static/images/kotlin/apps/wechat_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.gojek.app"> <img alt="GO-JEK" src="/static/images/kotlin/apps/go-jek.png" srcset="https://developer.android.com/static/images/kotlin/apps/go-jek.png 1x,https://developer.android.com/static/images/kotlin/apps/go-jek_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.atlassian.android.confluence.core"> <img alt="Confluence Cloud" src="/static/images/kotlin/apps/confluence-cloud.png" srcset="https://developer.android.com/static/images/kotlin/apps/confluence-cloud.png 1x,https://developer.android.com/static/images/kotlin/apps/confluence-cloud_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.offgrid.electric.zola.sales"> <img alt="Zola Sales" src="/static/images/kotlin/apps/zola-sales.png" srcset="https://developer.android.com/static/images/kotlin/apps/zola-sales.png 1x,https://developer.android.com/static/images/kotlin/apps/zola-sales_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.getsomeheadspace.android"> <img alt="Headspace" src="/static/images/kotlin/apps/headspace.png" srcset="https://developer.android.com/static/images/kotlin/apps/headspace.png 1x,https://developer.android.com/static/images/kotlin/apps/headspace_2x.png 2x"> </a> </li> <li class="devsite-landing-row-item-list-item"> <a href="https://play.google.com/store/apps/details?id=com.adobe.reader"> <img alt="Adobe Acrobat Reader" src="/static/images/kotlin/apps/adobe-acrobat-reader.png" srcset="https://developer.android.com/static/images/kotlin/apps/adobe-acrobat-reader.png 1x,https://developer.android.com/static/images/kotlin/apps/adobe-acrobat-reader_2x.png 2x"> </a> </li> </ul> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-2-up devsite-landing-row-padding-xlarge" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <div class="devsite-landing-row-item-labels"> <span class=" " >Developer story</span> </div> <h3 id="zomato-uses-kotlin-to-write-safer-more-concise-code" data-text="Zomato uses Kotlin to write safer, more concise code" class="hide-from-toc no-link" tabindex="0"> Zomato uses Kotlin to write safer, more concise code </h3> <div class="devsite-landing-row-item-description-content"> <p>Kotlin helped Zomato reduce the number of lines of code in their app significantly, and it has also helped them find important defects in their app at compile time.</p> <p>Watch Zomato's Rahul, Vice President, Product Management, and Prateek Sharma, Android developer, talk about how Zomato started adopting Kotlin and about how they now use it for all new feature releases.</p> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-description" description-position="bottom" > <div class="devsite-landing-row-item-media "> <devsite-video autohide="1" showinfo="0" video-id="ao9QvtpszOU" ></devsite-video> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-67 devsite-landing-row-no-image-background android-promo" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item android-border-radius-opt-out" description-position="left" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <a href="https://github.com/JetBrains/kotlin"> <picture> <img alt="" src="https://developer.android.com/static/images/kotlin/kotlin-logo-color.svg" srcset="https://developer.android.com/static/images/kotlin/kotlin-logo-color.svg" sizes="(max-width: 600px) 100vw, (max-width: 840px) 50vw, 464px" loading="lazy" > </picture> </a> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <div class="devsite-landing-row-item-labels"> <span class=" " >Featured</span> </div> <h3 id="kotlin-is-open-source" data-text="Kotlin is open source" class="hide-from-toc no-link" tabindex="0"> <a href="https://github.com/JetBrains/kotlin"> Kotlin is open source </a> </h3> <div class="devsite-landing-row-item-description-content"> Kotlin is an open source project available at no charge under the Apache 2.0 license. The code for the project is developed openly on GitHub primarily by the team employed at JetBrains, with contributions from Google and others. Our choice of Kotlin reaffirms our commitment to an open developer ecosystem as we evolve and grow the Android platform, and we are excited to see the language evolve. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://github.com/JetBrains/kotlin" class="button " >See Kotlin on GitHub</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-3-up devsite-landing-row-padding-xlarge android-illustrated-resources-primary android-row-background-grey-50 android-row-dark-background-grey-900" header-position="top" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="featured-resources" data-text="Featured resources" tabindex="0"> Featured resources </h2> </div> </header> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media android-fully-clickable-opt-out" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <a href="https://codelabs.developers.google.com/codelabs/kotlin-coroutines/#0"> <div class="devsite-landing-row-item-icon-container" size="large" > <picture> <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/kotlin/icons/android-codelabs.svg" srcset="https://developer.android.com/static/images/kotlin/icons/android-codelabs.svg" sizes="64px" loading="lazy" > </picture> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="android-codelabs-in-kotlin" data-text="Android codelabs in Kotlin" class="hide-from-toc no-link" tabindex="0"> <a href="https://codelabs.developers.google.com/codelabs/kotlin-coroutines/#0"> Android codelabs in Kotlin </a> </h3> <div class="devsite-landing-row-item-description-content"> Learn the latest best practices and APIs with Android codelabs in Kotlin. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://codelabs.developers.google.com/codelabs/kotlin-coroutines/#0" class="button " >Coroutines</a> <a href="https://codelabs.developers.google.com/codelabs/android-room-with-a-view-kotlin/#0" class="button " >Room with a view</a> <a href="https://codelabs.developers.google.com/codelabs/java-to-kotlin/#0" class="button " >Refactoring to Kotlin</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media android-fully-clickable-opt-out" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <a href="https://medium.com/androiddevelopers/tagged/kotlin"> <div class="devsite-landing-row-item-icon-container" size="large" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/logos/medium_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/logos/medium.svg" srcset="https://developer.android.com/static/images/logos/medium.svg" sizes="64px" loading="lazy" > </picture> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="android-kotlin-on-medium" data-text="Android + Kotlin on Medium" class="hide-from-toc no-link" tabindex="0"> <a href="https://medium.com/androiddevelopers/tagged/kotlin"> Android + Kotlin on Medium </a> </h3> <div class="devsite-landing-row-item-description-content"> Technical articles on Kotlin from the Android team. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://medium.com/androiddevelopers/tagged/kotlin" class="button " >Explore articles</a> </div> </div> </div> </div> <div class="devsite-landing-row-item devsite-landing-row-item-no-media android-fully-clickable-opt-out" description-position="bottom" > <div class="devsite-landing-row-item-description" icon-position="top" > <a href="https://developer.android.com/courses/android-basics-compose/course"> <div class="devsite-landing-row-item-icon-container" size="large" > <picture> <source class="devsite-landing-row-item-icon devsite-dark-theme" alt="" media="(prefers-color-scheme: dark)" srcset="https://developer.android.com/static/images/picto-icons/courses_dt.svg" sizes="64px" loading="lazy" > <img class="devsite-landing-row-item-icon" alt="" src="https://developer.android.com/static/images/picto-icons/courses.svg" srcset="https://developer.android.com/static/images/picto-icons/courses.svg" sizes="64px" loading="lazy" > </picture> </div> </a> <div class="devsite-landing-row-item-body"> <h3 id="android-basics-with-compose-course" data-text="Android Basics with Compose course" class="hide-from-toc no-link" tabindex="0"> <a href="https://developer.android.com/courses/android-basics-compose/course"> Android Basics with Compose course </a> </h3> <div class="devsite-landing-row-item-description-content"> For those with no programming experience, learn the basics of the Kotlin programming language and how to build simple Android apps. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://developer.android.com/courses/android-basics-compose/course" class="button " >Start course</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-2-up android-illustrated-resources-primary android-row-background-grey-50 android-row-dark-background-grey-900" header-position="top" > <div class="devsite-landing-row-inner"> <header class="devsite-landing-row-header" > <div class="devsite-landing-row-header-text"> <h2 id="kotlin-language-documentation" data-text="Kotlin language documentation" tabindex="0"> Kotlin language documentation </h2> </div> </header> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item devsite-landing-row-item-no-media" description-position="bottom" > <div 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