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href="/web/20210413201225/https://flutter.dev/docs/development/tools/android-studio">Android Studio & IntelliJ</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/vs-code">Visual Studio Code</a> </li><li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-7-3" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools" role="button" aria-expanded="false" aria-controls="sidenav-3-7-3">DevTools </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-7-3"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/overview">Overview</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/android-studio">Install from Android Studio & IntelliJ</a> </li> <li class="nav-item"> <a class="nav-link" 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href="/web/20210413201225/https://flutter.dev/docs/development/ui/layout" role="button" aria-expanded="false" aria-controls="sidenav-3-1-2">Building layouts </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-1-2"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/layout">Layouts in Flutter</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/layout/tutorial">Tutorial</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/layout/adaptive-responsive">Creating adaptive and responsive apps</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/layout/constraints">Understanding constraints [NEW]</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/layout/box-constraints">Box constraints</a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/interactive">Adding interactivity</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/assets-and-images">Assets and images</a> </li><li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-1-5" href="/web/20210413201225/https://flutter.dev/docs/development/ui/navigation" role="button" aria-expanded="false" aria-controls="sidenav-3-1-5">Navigation & routing </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-1-5"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/navigation">Navigation in Flutter</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/navigation/deep-linking">Deep linking</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/navigation/url-strategies">URL strategies</a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-1-6" href="/web/20210413201225/https://flutter.dev/docs/development/ui/animations" role="button" aria-expanded="false" aria-controls="sidenav-3-1-6">Animations </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-1-6"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/animations">Introduction</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/animations/overview">Overview</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/animations/tutorial">Tutorial</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/animations/implicit-animations">Implicit animations</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/animations/hero-animations">Hero animations</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/animations/staggered-animations">Staggered animations</a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-1-7" href="/web/20210413201225/https://flutter.dev/docs/development/ui/advanced" role="button" aria-expanded="false" aria-controls="sidenav-3-1-7">Advanced UI </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-1-7"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/advanced/slivers">Slivers</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/advanced/gestures">Gestures</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/advanced/splash-screen">Splash screens</a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ui/widgets">Widget catalog</a> </li></ul> </li> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-2" href="/web/20210413201225/https://flutter.dev/docs/development/data-and-backend" role="button" aria-expanded="false" aria-controls="sidenav-3-2">Data & backend </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-2"> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-2-1" href="/web/20210413201225/https://flutter.dev/docs/development/data-and-backend/state-mgmt" role="button" aria-expanded="false" aria-controls="sidenav-3-2-1">State management </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-2-1"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/data-and-backend/state-mgmt/intro">Introduction</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/data-and-backend/state-mgmt/declarative">Think declaratively</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/data-and-backend/state-mgmt/ephemeral-vs-app">Ephemeral vs app state</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/data-and-backend/state-mgmt/simple">Simple app state management</a> 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class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/platform-integration/ios-app-clip">Adding iOS App Clip support</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/platform-integration/apple-watch">Apple Watch support</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/platform-integration/c-interop">C interop</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/platform-integration/platform-views">Hosting native Android and iOS views</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/platform-integration/web">Web FAQ</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/platform-integration/platform-channels">Writing platform-specific code</a> </li></ul> </li> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-5" href="/web/20210413201225/https://flutter.dev/docs/development/packages-and-plugins" role="button" aria-expanded="false" aria-controls="sidenav-3-5">Packages & plugins </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-5"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/packages-and-plugins/using-packages">Using packages</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/packages-and-plugins/developing-packages">Developing packages & plugins</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/packages-and-plugins/favorites">Flutter Favorites program</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/packages-and-plugins/background-processes">Background processes</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/packages-and-plugins/plugin-api-migration">Android plugin upgrade</a> </li><li class="nav-item"> <a class="nav-link" href="https://web.archive.org/web/20210413201225/https://pub.dev/flutter" target="_blank" rel="noopener">Package site<i class="fas fa-external-link-alt"></i></a> </li></ul> </li> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-6" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app" role="button" aria-expanded="false" aria-controls="sidenav-3-6">Add Flutter to existing app </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-6"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app">Introduction</a> </li><li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-6-2" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/android" role="button" aria-expanded="false" aria-controls="sidenav-3-6-2">Adding to an Android app </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-6-2"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/android/project-setup">Project setup</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/android/add-flutter-screen">Add a single Flutter screen</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/android/add-flutter-fragment">Add a Flutter Fragment</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/android/add-flutter-view">Add a Flutter View</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/android/plugin-setup">Plugin setup</a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-6-3" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/ios" role="button" aria-expanded="false" aria-controls="sidenav-3-6-3">Adding to an iOS app </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-6-3"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/ios/project-setup">Project setup</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/ios/add-flutter-screen">Add a single Flutter screen</a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/debugging">Debugging & hot reload</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/performance">Loading sequence and performance</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/add-to-app/multiple-flutters">Multiple Flutter instances</a> </li></ul> </li> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-7" href="/web/20210413201225/https://flutter.dev/docs/development/tools" role="button" aria-expanded="false" aria-controls="sidenav-3-7">Tools & features </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-7"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/android-studio">Android Studio & IntelliJ</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/vs-code">Visual Studio Code</a> </li><li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-7-3" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools" role="button" aria-expanded="false" aria-controls="sidenav-3-7-3">DevTools </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-7-3"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/overview">Overview</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/android-studio">Install from Android Studio & IntelliJ</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/vscode">Install from VS Code</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/cli">Install from command line</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/inspector">Flutter inspector</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/performance">Performance view</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/cpu-profiler">CPU Profiler view</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/memory">Memory view</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/network">Network view</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/debugger">Debugger</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/logging">Logging view</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/devtools/app-size">App size tool</a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-7-4" href="/web/20210413201225/https://flutter.dev/docs/development/tools/sdk" role="button" aria-expanded="false" aria-controls="sidenav-3-7-4">Flutter SDK </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-7-4"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/sdk/overview">Overview</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/sdk/upgrading">Upgrading</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/sdk/releases">Releases</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/release/breaking-changes">Breaking changes</a> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/sdk/release-notes">Release notes</a> </li> </ul> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/pubspec">Flutter and the pubspec file</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/hot-reload">Hot reload</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/flutter-fix">Flutter Fix</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/formatting">Code formatting</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/tools/web-renderers">Web renderers</a> </li></ul> </li> <li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-3-8" href="/web/20210413201225/https://flutter.dev/docs/development/androidx-migration" role="button" aria-expanded="false" aria-controls="sidenav-3-8">Migration notes </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-3-8"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/androidx-migration">AndroidX migration</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/packages-and-plugins/plugin-api-migration">Android plugin upgrade</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ios-14">Developing for iOS 14</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/development/ios-project-migration">Xcode 11.4 support</a> </li></ul> </li> </ul> </li><li class="nav-item"> <a class="nav-link collapsed" data-toggle="collapse" href="#sidenav-4" role="button" aria-expanded="false" aria-controls="sidenav-4">Testing & debugging</a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-4"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/testing/debugging">Debugging tools</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/testing/code-debugging">Debugging apps programmatically</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/testing/oem-debuggers">Using an OEM debugger</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/testing/build-modes">Flutter's build modes</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/testing/common-errors">Common Flutter errors</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/testing/errors">Handling errors</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/testing">Testing</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/testing/integration-tests">Integration testing</a> </li> </ul> </li><li class="nav-item"> <a class="nav-link active" data-toggle="collapse" href="#sidenav-5" role="button" aria-expanded="true" aria-controls="sidenav-5">Performance & optimization</a> <ul class="nav flex-column flex-nowrap collapse show" id="sidenav-5"> <li class="nav-item"> <a class="nav-link active" href="/web/20210413201225/https://flutter.dev/docs/perf">Overview</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/perf/app-size">App size</a> </li><li class="nav-item"> <a class="nav-link collapsable collapsed" data-toggle="collapse" data-target="#sidenav-5-3" href="/web/20210413201225/https://flutter.dev/docs/perf/rendering" role="button" aria-expanded="false" aria-controls="sidenav-5-3">Rendering performance </a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-5-3"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/perf/rendering">Overview</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/perf/rendering/best-practices">Performance best practices</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/perf/rendering/ui-performance">Performance profiling</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/perf/rendering/shader">Reduce shader compilation jank</a> </li></ul> </li> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/perf/metrics">Performance metrics</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/perf/faq">Performance FAQ</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/perf/appendix">Appendix</a> </li> </ul> </li><li class="nav-item"> <a class="nav-link collapsed" data-toggle="collapse" href="#sidenav-6" role="button" aria-expanded="false" aria-controls="sidenav-6">Deployment</a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-6"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/deployment/obfuscate">Obfuscating Dart code</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/deployment/flavors">Creating flavors for Flutter</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/deployment/android">Build and release an Android app</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/deployment/ios">Build and release an iOS app</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/deployment/linux">Build and release a Linux app</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/deployment/web">Build and release a web app</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/deployment/cd">Continuous deployment</a> </li> </ul> </li><li class="nav-item"> <a class="nav-link collapsed" data-toggle="collapse" href="#sidenav-7" role="button" aria-expanded="false" aria-controls="sidenav-7">Resources</a> <ul class="nav flex-column flex-nowrap collapse " id="sidenav-7"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/bootstrap-into-dart">Dart resources</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/compatibility">Compatibility policy</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/architectural-overview">Architectural overview</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/inside-flutter">Inside Flutter</a> </li><li class="nav-item"> <a class="nav-link" href="https://web.archive.org/web/20210413201225/https://pub.dev/packages/google_fonts" target="_blank" rel="noopener">Google Fonts package<i class="fas fa-external-link-alt"></i></a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/platform-adaptations">Platform adaptations</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/videos">Videos and online courses</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/books">Books</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/faq">FAQ</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/design-docs">Design Documents</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/resources/bug-reports">Creating useful bug reports</a> </li><li class="nav-item"> <a class="nav-link" href="https://web.archive.org/web/20210413201225/https://github.com/flutter/flutter/blob/master/CONTRIBUTING.md" target="_blank" rel="noopener">Contributing to Flutter<i class="fas fa-external-link-alt"></i></a> </li><li class="nav-item"> <a class="nav-link" href="https://web.archive.org/web/20210413201225/https://drive.google.com/drive/folders/1KXNtO9My2AMpDOF9A9Y_4aj4_BcgmDDT" target="_blank" rel="noopener">Official brand assets<i class="fas fa-external-link-alt"></i></a> </li> </ul> </li><li class="nav-item"> <a class="nav-link " data-toggle="collapse" href="#sidenav-8" role="button" aria-expanded="true" aria-controls="sidenav-8">Reference</a> <ul class="nav flex-column flex-nowrap collapse show" id="sidenav-8"> <li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/dash">Who is Dash?</a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/reference/widgets">Widget index</a> </li><li class="nav-item"> <a class="nav-link" href="https://web.archive.org/web/20210413201225/https://api.flutter.dev/" target="_blank" rel="noopener">API reference<i class="fas fa-external-link-alt"></i></a> </li><li class="nav-item"> <a class="nav-link" href="/web/20210413201225/https://flutter.dev/docs/reference/flutter-cli">flutter CLI reference</a> </li><li class="nav-item"> <a class="nav-link" href="https://web.archive.org/web/20210413201225/https://pub.dev/flutter" target="_blank" rel="noopener">Package site<i class="fas fa-external-link-alt"></i></a> </li> </ul> </li></ul> </div> <div id="site-toc--side" class="site-toc site-toc--side fixed-col col-xl-2 order-3" data-fixed-column> <header class="site-toc__title"> Contents <button type="button" class="btn site-toc--button__page-top" aria-label="Page top"></button> </header> <ul class="section-nav nav"> <li class="toc-entry nav-item toc-h2"><a class="nav-link" href="#speed">Speed</a></li> <li class="toc-entry nav-item toc-h2"><a class="nav-link" href="#memory">Memory</a></li> <li class="toc-entry nav-item toc-h2"><a class="nav-link" href="#app-size">App size</a></li> </ul> </div> <main class="site-content col-12 col-md-9 offset-md-3 col-xl-8 offset-xl-2 col-xxl-8 offset-xxl-2" role="main"> <div class="container"> <header class="site-content__title"> <div id="page-github-links" class="btn-group" aria-label="Page GitHub links" role="group"> <a href="https://web.archive.org/web/20210413201225/https://github.com/flutter/website/tree/master/src/docs/perf/index.md" class="btn no-automatic-external" title="View page source" target="_blank" rel="noopener"> <i class="fas fa-file-alt fa-sm"></i> </a> <a href="https://web.archive.org/web/20210413201225/https://github.com/flutter/website/issues/new?title='Performance' page issue&body=Page URL: https://flutter.dev/docs/perf/%0D%0APage source: https://github.com/flutter/website/tree/master/src/docs/perf/index.md%0D%0A%0D%0AFound a typo? You can fix it yourself by going to the page source and clicking the pencil icon. Or finish creating this issue.%0D%0A%0D%0ADescription of issue:" class="btn no-automatic-external" title="Report an issue with this page" target="_blank" rel="noopener"> <i class="fas fa-bug fa-sm"></i> </a> </div> <h1>Performance</h1> </header> <div id="site-toc--inline" class="site-toc site-toc--inline "> <header class="site-toc__title"> Contents </header> <ul class="section-nav"> <li class="toc-entry toc-h2"><a href="#speed">Speed</a></li> <li class="toc-entry toc-h2"><a href="#memory">Memory</a></li> <li class="toc-entry toc-h2"><a href="#app-size">App size</a></li> </ul> </div> <iframe width="560" height="315" src="https://web.archive.org/web/20210413201225if_/https://www.youtube.com/embed/PKGguGUwSYE" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe> <p><a href="https://web.archive.org/web/20210413201225/https://www.youtube.com/watch?v=PKGguGUwSYE">Flutter performance basics</a></p> <p>What is performance? Why is performance important? How do I improve performance?</p> <p>Our goal is to answer those three questions (mainly the third one), and anything related to them. This document should serve as the single entry point or the root node of a tree of resources that addresses any questions that you have about performance.</p> <p>The answers to the first two questions are mostly philosophical, and not as helpful to many developers who visit this page with specific performance issues that need to be solved. Therefore, the answers to those questions are in the <a href="/web/20210413201225/https://flutter.dev/docs/perf/appendix">appendix</a>.</p> <p>To improve performance, you first need metrics: some measurable numbers to verify the problems and improvements. In the <a href="/web/20210413201225/https://flutter.dev/docs/perf/metrics">metrics</a> page, you’ll see which metrics are currently used, and which tools and APIs are available to get the metrics.</p> <p>There is a list of <a href="/web/20210413201225/https://flutter.dev/docs/perf/faq">Frequently asked questions</a>, so you can find out if the questions you have or the problems you’re having were already answered or encountered, and whether there are existing solutions. (Alternatively, you can check the Flutter GitHub issue database using the <a href="https://web.archive.org/web/20210413201225/https://github.com/flutter/flutter/issues?q=+label%3A%22severe%3A+performance%22">performance</a> label.)</p> <p>Finally, the performance issues are divided into four categories. They correspond to the four labels that are used in the Flutter GitHub issue database: “<a href="https://web.archive.org/web/20210413201225/https://github.com/flutter/flutter/issues?q=is%3Aopen+label%3A%22perf%3A+speed%22+sort%3Aupdated-asc+">perf: speed</a>”, “<a href="https://web.archive.org/web/20210413201225/https://github.com/flutter/flutter/issues?q=is%3Aopen+label%3A%22perf%3A+memory%22+sort%3Aupdated-asc+">perf: memory</a>”, “<a href="https://web.archive.org/web/20210413201225/https://github.com/flutter/flutter/issues?q=is%3Aopen+label%3A%22perf%3A+app+size%22+sort%3Aupdated-asc+">perf: app size</a>”, “<a href="https://web.archive.org/web/20210413201225/https://github.com/flutter/flutter/issues?q=is%3Aopen+label%3A%22perf%3A+energy%22+sort%3Aupdated-asc+">perf: energy</a>”.</p> <p>The rest of the content is organized using those four categories. (Note that these docs are in the process of being expanded.)</p>  <h2 id="speed"> <a class="anchor" href="#speed" aria-hidden="true"><span class="octicon octicon-link"></span></a>Speed</h2> <p>Are your animations janky (not smooth)? Learn how to evaluate and fix rendering issues.</p> <p><a href="/web/20210413201225/https://flutter.dev/docs/perf/rendering">Improving rendering performance</a></p> <h2 id="memory"> <a class="anchor" href="#memory" aria-hidden="true"><span class="octicon octicon-link"></span></a>Memory</h2> <p><a href="/web/20210413201225/https://flutter.dev/docs/perf/memory">Using memory wisely</a></p> <h2 id="app-size"> <a class="anchor" href="#app-size" aria-hidden="true"><span class="octicon octicon-link"></span></a>App size</h2> <p>How to measure your app’s size. The smaller the size, the quicker it is to download.</p> <p><a href="/web/20210413201225/https://flutter.dev/docs/perf/app-size">Measuring your app’s size</a></p> </div> </main> </div> </div> <footer class="site-footer"> <div class="container-fluid"> <div class="row"> <div class="col-md-12 site-footer__wrapper"> <div class="site-footer__logo"> <img src="/web/20210413201225im_/https://flutter.dev/images/flutter-mono-81x100.png" alt="Flutter Logo" width="81" height="100"> </div> <div class="site-footer__content"> <ul class="site-footer__link-list"> <li><a href="https://web.archive.org/web/20210413201225/https://groups.google.com/forum/#!forum/flutter-dev">flutter-dev@</a></li> <li><a href="/web/20210413201225/https://flutter.dev/tos">terms</a></li> <li><a href="/web/20210413201225/https://flutter.dev/brand">brand usage</a></li> <li><a href="/web/20210413201225/https://flutter.dev/security">security</a></li> <li><a href="https://web.archive.org/web/20210413201225/https://www.google.com/intl/en/policies/privacy">privacy</a></li> <li><a href="https://web.archive.org/web/20210413201225/https://esflutter.dev/">español</a></li> <li><a href="https://web.archive.org/web/20210413201225/https://flutter.cn/" class="text-nowrap">社区中文资源</a></li> <li><a href="https://web.archive.org/web/20210413201225/https://flutter-ko.dev/" class="text-nowrap">한국어</a></li> <li><a href="https://web.archive.org/web/20210413201225/https://blog.google/inside-google/company-announcements/standing-with-black-community">We stand in solidarity with the Black community. 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