Android Open Source Project

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docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Release notes </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/whatsnew/latest-security-bulletins" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/whatsnew/latest-security-bulletins" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Latest security bulletins </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/whatsnew/latest-cdd" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/whatsnew/latest-cdd" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Latest Compatibility Definition Document (CDD) </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/whatsnew/site-updates" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/whatsnew/site-updates" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Site updates </div> </a> </li> </ul> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Getting Started</li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/setup/about" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/setup/about" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> About </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/setup/start" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/setup/start" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Start </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/setup/download" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/setup/download" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Download </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/setup/build" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/setup/build" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Build </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/setup/test" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/setup/test" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Test </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/setup/create/coding-tasks" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/setup/create/coding-tasks" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Create </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/setup/contribute" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/setup/contribute" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Contribute </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/setup/community/cofc" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/setup/community/cofc" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Community </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/setup/reference" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/setup/reference" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Tools, build, and related reference </div> </a> </li> </ul> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Security</li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/security/overview" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/security/overview" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Overview </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/security/bulletin" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/security/bulletin" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Bulletins </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/security/features" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/security/features" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Features </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/security/test/fuzz-sanitize" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/security/test/fuzz-sanitize" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Testing </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/security/best-practices" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/security/best-practices" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="what's new?" tooltip > <div class="devsite-nav-item-title"> Best Practices </div> </a> </li> </ul> </div> <div class="devsite-tabs-dropdown-column android-source-tabs-dropdown-column-small"> <ul class="devsite-tabs-dropdown-section "> <li class="devsite-nav-title" role="heading" tooltip>Core Topics</li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/architecture" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/architecture" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Architecture </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/audio" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/audio" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Audio </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/camera" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/camera" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Camera </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/connect" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/connect" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Connectivity </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/data" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/data" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Data </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/display" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/display" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Display </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/fonts/custom-font-fallback" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/fonts/custom-font-fallback" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Fonts </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/graphics" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/graphics" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Graphics </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/interaction" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/interaction" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Interaction </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/media" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/media" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Media </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/perf" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/perf" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Performance </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/permissions" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/permissions" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Permissions </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/power" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/power" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Power </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/runtime" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/runtime" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Runtime </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/settings" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/settings" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Settings </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/storage" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/storage" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Storage </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/tests" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/tests" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Tests </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/ota" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/ota" track-metadata-position="nav - docs" track-metadata-module="tertiary nav" track-metadata-module_headline="core topics" tooltip > <div class="devsite-nav-item-title"> Updates </div> </a> </li> <li class="devsite-nav-item"> <a href="https://source.android.com/docs/core/virtualization" track-type="nav" track-metadata-eventdetail="https://source.android.com/docs/core/virtualization" track-metadata-position="nav - 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close-button-text="Got it"> <devsite-bookmark></devsite-bookmark> <span slot="popout-heading"> Stay organized with collections </span> <span slot="popout-contents"> Save and categorize content based on your preferences. </span> </devsite-feature-tooltip> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded disabled> </devsite-toc> <div class="devsite-article-body clearfix devsite-no-page-title"> <section class="devsite-landing-row devsite-landing-row-3-up devsite-landing-row-no-image-background" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item" description-position="bottom" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <a href="https://source.android.com/docs/core/architecture"> <picture> <img alt="" src="https://source.android.com/static/images/landing_icon-porting.png" srcset="https://source.android.com/static/images/landing_icon-porting_36.png 36w,https://source.android.com/static/images/landing_icon-porting_48.png 48w,https://source.android.com/static/images/landing_icon-porting_72.png 72w,https://source.android.com/static/images/landing_icon-porting_96.png 96w,https://source.android.com/static/images/landing_icon-porting_480.png 480w,https://source.android.com/static/images/landing_icon-porting_720.png 720w,https://source.android.com/static/images/landing_icon-porting_856.png 856w,https://source.android.com/static/images/landing_icon-porting_960.png 960w,https://source.android.com/static/images/landing_icon-porting_1440.png 1440w,https://source.android.com/static/images/landing_icon-porting_1920.png 1920w,https://source.android.com/static/images/landing_icon-porting_2880.png 2880w" sizes="(max-width: 840px) 50vw, 464px" fetchpriority="high"> </picture> </a> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="interfaces-and-architecture" data-text="Interfaces and architecture" class="hide-from-toc no-link" tabindex="0"> <a href="https://source.android.com/docs/core/architecture"> Interfaces and architecture </a> </h3> <div class="devsite-landing-row-item-description-content"> Learn how the pieces fit together, from the kernel to the HALs to updatable system components. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://source.android.com/docs/core/architecture" class="button " >Understand architecture</a> </div> </div> </div> </div> <div class="devsite-landing-row-item" description-position="bottom" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <a href="https://source.android.com/docs/security"> <picture> <img alt="" src="https://source.android.com/static/images/landing_icon-security.png" srcset="https://source.android.com/static/images/landing_icon-security_36.png 36w,https://source.android.com/static/images/landing_icon-security_48.png 48w,https://source.android.com/static/images/landing_icon-security_72.png 72w,https://source.android.com/static/images/landing_icon-security_96.png 96w,https://source.android.com/static/images/landing_icon-security_480.png 480w,https://source.android.com/static/images/landing_icon-security_720.png 720w,https://source.android.com/static/images/landing_icon-security_856.png 856w,https://source.android.com/static/images/landing_icon-security_960.png 960w,https://source.android.com/static/images/landing_icon-security_1440.png 1440w,https://source.android.com/static/images/landing_icon-security_1920.png 1920w,https://source.android.com/static/images/landing_icon-security_2880.png 2880w" sizes="(max-width: 840px) 50vw, 464px" fetchpriority="high"> </picture> </a> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="android-security-is-essential" data-text="Android security is essential" class="hide-from-toc no-link" tabindex="0"> <a href="https://source.android.com/docs/security"> Android security is essential </a> </h3> <div class="devsite-landing-row-item-description-content"> Find out how the Android security program works and learn how to implement the latest features. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://source.android.com/docs/security" class="button " >Implement security</a> </div> </div> </div> </div> <div class="devsite-landing-row-item" description-position="bottom" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <a href="https://source.android.com/docs/compatibility"> <picture> <img alt="" src="https://source.android.com/static/images/landing_icon-compatibility.png" srcset="https://source.android.com/static/images/landing_icon-compatibility_36.png 36w,https://source.android.com/static/images/landing_icon-compatibility_48.png 48w,https://source.android.com/static/images/landing_icon-compatibility_72.png 72w,https://source.android.com/static/images/landing_icon-compatibility_96.png 96w,https://source.android.com/static/images/landing_icon-compatibility_480.png 480w,https://source.android.com/static/images/landing_icon-compatibility_720.png 720w,https://source.android.com/static/images/landing_icon-compatibility_856.png 856w,https://source.android.com/static/images/landing_icon-compatibility_960.png 960w,https://source.android.com/static/images/landing_icon-compatibility_1440.png 1440w,https://source.android.com/static/images/landing_icon-compatibility_1920.png 1920w,https://source.android.com/static/images/landing_icon-compatibility_2880.png 2880w" sizes="(max-width: 840px) 50vw, 464px" fetchpriority="high"> </picture> </a> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="design-compatible-devices" data-text="Design compatible devices" class="hide-from-toc no-link" tabindex="0"> <a href="https://source.android.com/docs/compatibility"> Design compatible devices </a> </h3> <div class="devsite-landing-row-item-description-content"> Offer consistent experiences across different Android-powered devices for users and app developers. </div> <div class="devsite-landing-row-item-buttons"> <a href="https://source.android.com/docs/compatibility" class="button " >Test devices</a> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-50 devsite-landing-row-no-image-background devsite-landing-row-padding-xlarge android-feature-callout" background="grey" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item" description-position="bottom" > <div class="devsite-landing-row-item-media "> <figure class="devsite-landing-row-item-image"> <picture> <img alt="" src="https://source.android.com/static/images/android_stack.png" srcset="https://source.android.com/static/images/android_stack_36.png 36w,https://source.android.com/static/images/android_stack_48.png 48w,https://source.android.com/static/images/android_stack_72.png 72w,https://source.android.com/static/images/android_stack_96.png 96w,https://source.android.com/static/images/android_stack_480.png 480w,https://source.android.com/static/images/android_stack_720.png 720w,https://source.android.com/static/images/android_stack_856.png 856w,https://source.android.com/static/images/android_stack_960.png 960w,https://source.android.com/static/images/android_stack_1440.png 1440w,https://source.android.com/static/images/android_stack_1920.png 1920w,https://source.android.com/static/images/android_stack_2880.png 2880w" sizes="(max-width: 600px) 100vw, (max-width: 840px) 50vw, 708px" loading="lazy" > </picture> </figure> </div> <div class="devsite-landing-row-item-description" > <div class="devsite-landing-row-item-body"> <h3 id="about-the-android-open-source-project" data-text="About the Android Open Source Project" class="hide-from-toc no-link" tabindex="0"> About the Android Open Source Project </h3> <div class="devsite-landing-row-item-description-content"> <p>Android is an open source operating system for mobile devices and a corresponding open source project led by Google. This site and the Android Open Source Project (AOSP) repository offer the information and source code needed to create custom variants of the Android OS, port devices and accessories to the Android platform, and ensure devices meet the compatibility requirements that keep the Android ecosystem a healthy and stable environment for millions of users.</p> <p>As an open source project, Android's goal is to avoid any central point of failure in which one industry player can restrict or control the innovations of any other player. To that end, Android is a full, production-quality operating system for consumer products, complete with customizable source code that can be ported to nearly any device and public documentation that is available to everyone (in English at <a href="/">source.android.com</a> and in Simplified Chinese at <a href="https://source.android.google.cn/">source.android.google.cn</a>).</p> <p>Just as you can <a href="/setup/contribute">contribute code to AOSP</a>, you can also contribute to AOSP documentation—and we want your input! Android's flexibility and ever-changing codebase means this site needs your feedback to keep content fresh, accurate, and relevant to Android implementors. We encourage you to check the <a href="https://android.googlesource.com/platform/docs/source.android.com/+log/master?pretty=full&no-merges">changelog</a> for details on recent AOSP updates and to report bugs or offer suggestions using the <a href="https://issuetracker.google.com/issues/new?component=191476">Site Feedback</a> at the bottom of every page (or by visiting <a href="https://g.co/androidsourceissue">g.co/androidsourceissue</a>).</p> </div> </div> </div> </div> </div> </div> </section> <section class="devsite-landing-row devsite-landing-row-1-up devsite-landing-row-50 devsite-landing-row-no-image-background android-callout" header-position="top" > <div class="devsite-landing-row-inner"> <div class="devsite-landing-row-group"> <div class="devsite-landing-row-item" description-position="bottom" > <div class="devsite-landing-row-item-media devsite-landing-row-item-media-left "> <figure class="devsite-landing-row-item-image"> <a href="https://source.android.com/docs/core/architecture/kernel"> <picture> <img alt="" src="https://developer.android.com/static/images/cluster-illustrations/success-guide-16-9.svg" srcset="https://developer.android.com/static/images/cluster-illustrations/success-guide-16-9.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"> <h3 id="generic-kernel-image-gki-development" data-text="Generic Kernel Image (GKI) Development" class="hide-from-toc no-link" tabindex="0"> <a href="https://source.android.com/docs/core/architecture/kernel"> Generic Kernel Image (GKI) Development </a> </h3> <div class="devsite-landing-row-item-description-content"> <p>The Generic Kernel Image (GKI) project addresses kernel fragmentation by unifying the core kernel and moving SoC and board support out of the core kernel into loadable vendor modules. 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