Kotlin for Jetpack Compose | Android Developers

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devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>App layout</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/basics" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/basics" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/basics" ><span class="devsite-nav-text" tooltip>Layout basics</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/modifiers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/modifiers" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/modifiers" ><span class="devsite-nav-text" tooltip>Modifiers</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/constraints-modifiers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/constraints-modifiers" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/constraints-modifiers" ><span class="devsite-nav-text" tooltip>Constraints and modifier order</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/custom-modifiers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/custom-modifiers" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/custom-modifiers" ><span class="devsite-nav-text" tooltip>Custom modifiers</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/modifiers-list" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/modifiers-list" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/modifiers-list" ><span class="devsite-nav-text" tooltip>List of modifiers</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/pager" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/pager" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/pager" ><span class="devsite-nav-text" tooltip>Pager</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/flow" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/flow" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/flow" ><span class="devsite-nav-text" tooltip>Flow layouts</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/custom" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/custom" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/custom" ><span class="devsite-nav-text" tooltip>Custom layouts</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Adaptive layouts</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/canonical-layouts" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/canonical-layouts" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/canonical-layouts" ><span class="devsite-nav-text" tooltip>Canonical layouts</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/support-different-screen-sizes" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/support-different-screen-sizes" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/support-different-screen-sizes" ><span class="devsite-nav-text" tooltip>Support different screen sizes</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/use-window-size-classes" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/use-window-size-classes" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/use-window-size-classes" ><span class="devsite-nav-text" tooltip>Use window size classes</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/support-multi-window-mode" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/support-multi-window-mode" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/support-multi-window-mode" ><span class="devsite-nav-text" tooltip>Support multi-window mode</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/support-desktop-windowing" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/support-desktop-windowing" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/support-desktop-windowing" ><span class="devsite-nav-text" tooltip>Support desktop windowing</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/build-adaptive-navigation" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/build-adaptive-navigation" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/build-adaptive-navigation" ><span class="devsite-nav-text" tooltip>Build adaptive navigation</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/list-detail" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/list-detail" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/list-detail" ><span class="devsite-nav-text" tooltip>Build a list-detail layout</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/build-a-supporting-pane-layout" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/build-a-supporting-pane-layout" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/build-a-supporting-pane-layout" ><span class="devsite-nav-text" tooltip>Build a supporting pane layout</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/adaptive-dos-and-donts" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/adaptive-dos-and-donts" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/adaptive-dos-and-donts" ><span class="devsite-nav-text" tooltip>Adaptive do's and don'ts</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Foldables</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/foldables/learn-about-foldables" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/foldables/learn-about-foldables" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/foldables/learn-about-foldables" ><span class="devsite-nav-text" tooltip>Learn about foldables</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/foldables/make-your-app-fold-aware" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/foldables/make-your-app-fold-aware" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/foldables/make-your-app-fold-aware" ><span class="devsite-nav-text" tooltip>Make your app fold-aware</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/adaptive/foldables/support-foldable-display-modes" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/adaptive/foldables/support-foldable-display-modes" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/adaptive/foldables/support-foldable-display-modes" ><span class="devsite-nav-text" tooltip>Support foldable display modes</span></a></li></ul></div></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/alignment-lines" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/alignment-lines" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/alignment-lines" ><span class="devsite-nav-text" tooltip>Alignment lines</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/intrinsic-measurements" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/intrinsic-measurements" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/intrinsic-measurements" ><span class="devsite-nav-text" tooltip>Intrinsic measurements</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/constraintlayout" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/constraintlayout" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/constraintlayout" ><span class="devsite-nav-text" tooltip>ConstraintLayout</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Components</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/components" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>App bars</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/components/app-bars" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/app-bars" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/app-bars" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/app-bars-navigate" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/app-bars-navigate" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/app-bars-navigate" ><span class="devsite-nav-text" tooltip>Navigate from top app bar</span></a></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/badges" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/badges" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/badges" ><span class="devsite-nav-text" tooltip>Badges</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Bottom sheets</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/components/bottom-sheets" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/bottom-sheets" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/bottom-sheets" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/bottom-sheets-partial" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/bottom-sheets-partial" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/bottom-sheets-partial" ><span class="devsite-nav-text" tooltip>Partial bottom sheet</span></a></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/button" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/button" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/button" ><span class="devsite-nav-text" tooltip>Button</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/card" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/card" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/card" ><span class="devsite-nav-text" tooltip>Card</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/checkbox" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/checkbox" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/checkbox" ><span class="devsite-nav-text" tooltip>Checkbox</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/chip" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/chip" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/chip" ><span class="devsite-nav-text" tooltip>Chip</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/datepickers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/datepickers" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/datepickers" ><span class="devsite-nav-text" tooltip>Date pickers</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/dialog" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/dialog" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/dialog" ><span class="devsite-nav-text" tooltip>Dialog</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/divider" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/divider" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/divider" ><span class="devsite-nav-text" tooltip>Divider</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/fab" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/fab" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/fab" ><span class="devsite-nav-text" tooltip>Floating action button</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/lists" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/lists" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/lists" ><span class="devsite-nav-text" tooltip>Lists and grids</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/drawer" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/drawer" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/drawer" ><span class="devsite-nav-text" tooltip>Navigation drawer</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/progress" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/progress" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/progress" ><span class="devsite-nav-text" tooltip>Progress indicators</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/resources" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/resources" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/resources" ><span class="devsite-nav-text" tooltip>Resources</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/scaffold" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/scaffold" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/scaffold" ><span class="devsite-nav-text" tooltip>Scaffold</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/slider" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/slider" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/slider" ><span class="devsite-nav-text" tooltip>Slider</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/snackbar" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/snackbar" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/snackbar" ><span class="devsite-nav-text" tooltip>Snackbar</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/switch" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/switch" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/switch" ><span class="devsite-nav-text" tooltip>Switch</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Time pickers</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/components/time-pickers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/time-pickers" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/time-pickers" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/components/time-pickers-dialogs" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/components/time-pickers-dialogs" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/components/time-pickers-dialogs" ><span class="devsite-nav-text" tooltip>Time picker dialogs</span></a></li></ul></div></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Theming</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/designsystems" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/designsystems" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/designsystems" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/designsystems/material3" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/designsystems/material3" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/designsystems/material3" ><span class="devsite-nav-text" tooltip>Material Design 3</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/designsystems/material2-material3" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/designsystems/material2-material3" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/designsystems/material2-material3" ><span class="devsite-nav-text" tooltip>Migrate from Material 2 to Material 3</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/designsystems/material" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/designsystems/material" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/designsystems/material" ><span class="devsite-nav-text" tooltip>Material Design 2</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/designsystems/custom" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/designsystems/custom" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/designsystems/custom" ><span class="devsite-nav-text" tooltip>Custom theming</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/designsystems/anatomy" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/designsystems/anatomy" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/designsystems/anatomy" ><span class="devsite-nav-text" tooltip>Anatomy of a theme</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/designsystems/views-to-compose" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/designsystems/views-to-compose" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/designsystems/views-to-compose" ><span class="devsite-nav-text" tooltip>Migrating XML themes to Compose</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Text and typography</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/text" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/text" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/text" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Display and style text</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/text/display-text" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/text/display-text" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/text/display-text" ><span class="devsite-nav-text" tooltip>Display text from resource</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/text/style-text" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/text/style-text" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/text/style-text" ><span class="devsite-nav-text" tooltip>Style text</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/text/style-paragraph" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/text/style-paragraph" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/text/style-paragraph" ><span class="devsite-nav-text" tooltip>Style paragraph</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/text/configure-layout" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/text/configure-layout" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/text/configure-layout" ><span class="devsite-nav-text" tooltip>Configure text layout</span></a></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/text/user-input" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/text/user-input" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/text/user-input" ><span class="devsite-nav-text" tooltip>Handle user input</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/text/user-interactions" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/text/user-interactions" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/text/user-interactions" ><span class="devsite-nav-text" tooltip>Enable user interactions</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/text/fonts" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/text/fonts" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/text/fonts" ><span class="devsite-nav-text" tooltip>Work with fonts</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/text/emoji" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/text/emoji" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/text/emoji" ><span class="devsite-nav-text" tooltip>Display emoji</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Images and graphics</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Images</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/images" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/images" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/images" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/images/loading" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/images/loading" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/images/loading" ><span class="devsite-nav-text" tooltip>Loading images</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/images/compare" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/images/compare" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/images/compare" ><span class="devsite-nav-text" tooltip>ImageBitmap vs ImageVector</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/images/material" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/images/material" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/images/material" ><span class="devsite-nav-text" tooltip>Material icons</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/images/customize" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/images/customize" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/images/customize" ><span class="devsite-nav-text" tooltip>Customize an image</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/images/custompainter" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/images/custompainter" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/images/custompainter" ><span class="devsite-nav-text" tooltip>Custom painter</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/images/optimization" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/images/optimization" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/images/optimization" ><span class="devsite-nav-text" tooltip>Optimizing performance</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Graphics</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/draw/overview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/draw/overview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/draw/overview" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/draw/modifiers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/draw/modifiers" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/draw/modifiers" ><span class="devsite-nav-text" tooltip>Graphics Modifiers</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/draw/brush" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/draw/brush" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/draw/brush" ><span class="devsite-nav-text" tooltip>Brush</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/graphics/draw/shapes" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/graphics/draw/shapes" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/graphics/draw/shapes" ><span class="devsite-nav-text" tooltip>Shapes</span></a></li></ul></div></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Animation</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/introduction" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/introduction" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/introduction" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/choose-api" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/choose-api" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/choose-api" ><span class="devsite-nav-text" tooltip>Choose an animation API</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/quick-guide" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/quick-guide" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/quick-guide" ><span class="devsite-nav-text" tooltip>Quick guide</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/composables-modifiers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/composables-modifiers" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/composables-modifiers" ><span class="devsite-nav-text" tooltip>Animation modifiers and composables</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/value-based" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/value-based" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/value-based" ><span class="devsite-nav-text" tooltip>Value-based animations</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/vectors" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/vectors" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/vectors" ><span class="devsite-nav-text" tooltip>Animated vector images</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/advanced" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/advanced" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/advanced" ><span class="devsite-nav-text" tooltip>Advanced animation example</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/customize" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/customize" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/customize" ><span class="devsite-nav-text" tooltip>Customize animations</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Shared elements</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/shared-elements" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/shared-elements" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/shared-elements" ><span class="devsite-nav-text" tooltip>Introduction</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/shared-elements/customize" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/shared-elements/customize" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/shared-elements/customize" ><span class="devsite-nav-text" tooltip>Customize</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/shared-elements/common-use-cases" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/shared-elements/common-use-cases" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/shared-elements/common-use-cases" ><span class="devsite-nav-text" tooltip>Common use cases</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/shared-elements/navigation" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/shared-elements/navigation" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/shared-elements/navigation" ><span class="devsite-nav-text" tooltip>With navigation</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/shared-elements/additional-samples" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/shared-elements/additional-samples" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/shared-elements/additional-samples" ><span class="devsite-nav-text" tooltip>Additional samples</span></a></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/testing" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/testing" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/testing" ><span class="devsite-nav-text" tooltip>Test animations</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/tooling" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/tooling" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/tooling" ><span class="devsite-nav-text" tooltip>Tools</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/animation/resources" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/animation/resources" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/animation/resources" ><span class="devsite-nav-text" tooltip>Additional resources</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Accessibility</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/accessibility" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/accessibility" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/accessibility" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/accessibility/key-steps" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/accessibility/key-steps" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/accessibility/key-steps" ><span class="devsite-nav-text" tooltip>Key steps</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/accessibility/semantics" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/accessibility/semantics" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/accessibility/semantics" ><span class="devsite-nav-text" tooltip>Semantics</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/accessibility/traversal" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/accessibility/traversal" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/accessibility/traversal" ><span class="devsite-nav-text" tooltip>Control traversal order</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/accessibility/testing" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/accessibility/testing" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/accessibility/testing" ><span class="devsite-nav-text" tooltip>Testing</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Touch and input</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Pointer input</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/pointer-input" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/pointer-input" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/pointer-input" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/pointer-input/understand-gestures" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/pointer-input/understand-gestures" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/pointer-input/understand-gestures" ><span class="devsite-nav-text" tooltip>Understand gestures</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/pointer-input/tap-and-press" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/pointer-input/tap-and-press" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/pointer-input/tap-and-press" ><span class="devsite-nav-text" tooltip>Tap and press</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/pointer-input/scroll" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/pointer-input/scroll" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/pointer-input/scroll" ><span class="devsite-nav-text" tooltip>Scroll</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/pointer-input/drag-swipe-fling" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/pointer-input/drag-swipe-fling" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/pointer-input/drag-swipe-fling" ><span class="devsite-nav-text" tooltip>Drag, swipe, and fling</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/pointer-input/multi-touch" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/pointer-input/multi-touch" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/pointer-input/multi-touch" ><span class="devsite-nav-text" tooltip>Multi-touch gestures</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Keyboard input</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/keyboard-input/commands" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/keyboard-input/commands" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/keyboard-input/commands" ><span class="devsite-nav-text" tooltip>Handle keyboard actions</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/keyboard-input/keyboard-shortcuts-helper" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/keyboard-input/keyboard-shortcuts-helper" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/keyboard-input/keyboard-shortcuts-helper" ><span class="devsite-nav-text" tooltip>Keyboard Shortcuts Helper</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Focus</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/focus" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/focus" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/focus" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/focus/change-focus-traversal-order" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/focus/change-focus-traversal-order" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/focus/change-focus-traversal-order" ><span class="devsite-nav-text" tooltip>Change focus traversal order</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/focus/change-focus-behavior" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/focus/change-focus-behavior" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/focus/change-focus-behavior" ><span class="devsite-nav-text" tooltip>Change focus behavior</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/focus/react-to-focus" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/focus/react-to-focus" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/focus/react-to-focus" ><span class="devsite-nav-text" tooltip>React to focus</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>User interactions</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/user-interactions/handling-interactions" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/user-interactions/handling-interactions" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/user-interactions/handling-interactions" ><span class="devsite-nav-text" tooltip>Handling interactions</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/user-interactions/migrate-indication-ripple" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/user-interactions/migrate-indication-ripple" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/user-interactions/migrate-indication-ripple" ><span class="devsite-nav-text" tooltip>Migrate to Indication and Ripple APIs</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/user-interactions/drag-and-drop" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/user-interactions/drag-and-drop" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/user-interactions/drag-and-drop" ><span class="devsite-nav-text" tooltip>Drag and Drop</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Stylus input</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/stylus-input-in-text-fields" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/stylus-input-in-text-fields" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/stylus-input-in-text-fields" ><span class="devsite-nav-text" tooltip>Stylus input in text fields</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/advanced-stylus-features" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/advanced-stylus-features" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/advanced-stylus-features" ><span class="devsite-nav-text" tooltip>Advanced stylus features</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/create-a-note-taking-app" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/create-a-note-taking-app" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/create-a-note-taking-app" ><span class="devsite-nav-text" tooltip>Note-taking apps</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Add inking to your app with the Ink API</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/about-ink-api" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/about-ink-api" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/about-ink-api" ><span class="devsite-nav-text" tooltip>About the Ink API</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/ink-api-setup" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/ink-api-setup" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/ink-api-setup" ><span class="devsite-nav-text" tooltip>Setup</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/ink-api-modules" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/ink-api-modules" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/ink-api-modules" ><span class="devsite-nav-text" tooltip>Pick your module</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/ink-api-draw-stroke" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/ink-api-draw-stroke" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/ink-api-draw-stroke" ><span class="devsite-nav-text" tooltip>Draw a stroke</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/ink-api-brush-apis" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/ink-api-brush-apis" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/ink-api-brush-apis" ><span class="devsite-nav-text" tooltip>Define your brushes</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/ink-api-geometry-apis" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/ink-api-geometry-apis" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/ink-api-geometry-apis" ><span class="devsite-nav-text" tooltip>Create interactive tools with the Geometry APIs</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/stylus-input/ink-api-state-preservation" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/stylus-input/ink-api-state-preservation" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/stylus-input/ink-api-state-preservation" ><span class="devsite-nav-text" tooltip>State preservation and persistent storage</span></a></li></ul></div></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/touch-input/copy-and-paste" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/touch-input/copy-and-paste" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/touch-input/copy-and-paste" ><span class="devsite-nav-text" tooltip>Copy and paste</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Performance</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/performance" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/performance" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/performance" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/performance/phases" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/performance/phases" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/performance/phases" ><span class="devsite-nav-text" tooltip>Phases</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/performance/baseline-profiles" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/performance/baseline-profiles" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/performance/baseline-profiles" ><span class="devsite-nav-text" tooltip>Baseline profiles</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Stability</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/performance/stability" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/performance/stability" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/performance/stability" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/performance/stability/diagnose" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/performance/stability/diagnose" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/performance/stability/diagnose" ><span class="devsite-nav-text" tooltip>Diagnose stability issues</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/performance/stability/fix" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/performance/stability/fix" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/performance/stability/fix" ><span class="devsite-nav-text" tooltip>Fix stability issues</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/performance/stability/strongskipping" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/performance/stability/strongskipping" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/performance/stability/strongskipping" ><span class="devsite-nav-text" tooltip>Strong skipping</span></a></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/performance/tooling" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/performance/tooling" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/performance/tooling" ><span class="devsite-nav-text" tooltip>Tools</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/performance/bestpractices" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/performance/bestpractices" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/performance/bestpractices" ><span class="devsite-nav-text" tooltip>Best practices</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Style guidelines</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/api-guidelines" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/api-guidelines" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/api-guidelines" ><span class="devsite-nav-text" tooltip>Compose API guidelines</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/kotlin" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/kotlin" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/kotlin" ><span class="devsite-nav-text" tooltip>Kotlin for Compose</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>UI testing</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/testing" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/testing" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/testing" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/testing/testing-cheatsheet" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/testing/testing-cheatsheet" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/testing/testing-cheatsheet" ><span class="devsite-nav-text" tooltip>Cheatsheet</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/testing/semantics" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/testing/semantics" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/testing/semantics" ><span class="devsite-nav-text" tooltip>Semantics</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/testing/apis" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/testing/apis" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/testing/apis" ><span class="devsite-nav-text" tooltip>Testing APIs</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/testing/synchronization" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/testing/synchronization" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/testing/synchronization" ><span class="devsite-nav-text" tooltip>Synchronize tests</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/testing/interoperability" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/testing/interoperability" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/testing/interoperability" ><span class="devsite-nav-text" tooltip>Interoperability</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/testing/common-patterns" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/testing/common-patterns" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/testing/common-patterns" ><span class="devsite-nav-text" tooltip>Common patterns</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/testing/debug" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/testing/debug" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/testing/debug" ><span class="devsite-nav-text" tooltip>Debug tests</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Migrate to Compose</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate/strategy" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate/strategy" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate/strategy" ><span class="devsite-nav-text" tooltip>Migration strategy</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Interoperability APIs</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate/interoperability-apis" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate/interoperability-apis" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate/interoperability-apis" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate/interoperability-apis/compose-in-views" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate/interoperability-apis/compose-in-views" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate/interoperability-apis/compose-in-views" ><span class="devsite-nav-text" tooltip>Using Compose in Views</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate/interoperability-apis/views-in-compose" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate/interoperability-apis/views-in-compose" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate/interoperability-apis/views-in-compose" ><span class="devsite-nav-text" tooltip>Using Views in Compose</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Common migration scenarios</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate/migration-scenarios/recycler-view" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate/migration-scenarios/recycler-view" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate/migration-scenarios/recycler-view" ><span class="devsite-nav-text" tooltip>Migrate RecyclerView to Compose</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate/migration-scenarios/coordinator-layout" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate/migration-scenarios/coordinator-layout" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate/migration-scenarios/coordinator-layout" ><span class="devsite-nav-text" tooltip>Migrate CoordinatorLayout to Compose</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate/migration-scenarios/navigation" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate/migration-scenarios/navigation" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate/migration-scenarios/navigation" ><span class="devsite-nav-text" tooltip>Migrate Jetpack Navigation to Navigation Compose</span></a></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate/other-considerations" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate/other-considerations" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate/other-considerations" ><span class="devsite-nav-text" tooltip>Other considerations</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/adopt/for-large-teams" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/adopt/for-large-teams" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/adopt/for-large-teams" ><span class="devsite-nav-text" tooltip>Adopt Compose for teams</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/libraries" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/libraries" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/libraries" ><span class="devsite-nav-text" tooltip>Compose and other libraries</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/migrate/compare-metrics" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/migrate/compare-metrics" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/migrate/compare-metrics" ><span class="devsite-nav-text" tooltip>Compare Compose and View metrics</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Tools</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Design</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/previews" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/previews" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/previews" ><span class="devsite-nav-text" tooltip>Preview your UI</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/animation-preview" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/animation-preview" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/animation-preview" ><span class="devsite-nav-text" tooltip>Preview and debug animations</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Develop</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/iterative-development" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/iterative-development" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/iterative-development" ><span class="devsite-nav-text" tooltip>Develop code iteratively</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/editor-actions" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/editor-actions" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/editor-actions" ><span class="devsite-nav-text" tooltip>Editor actions</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Debug</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/layout-inspector" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/layout-inspector" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/layout-inspector" ><span class="devsite-nav-text" tooltip>Inspect your layout</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/tracing" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/tracing" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/tracing" ><span class="devsite-nav-text" tooltip>Trace app performance</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Relay designer and developer tooling</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/install-relay" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/install-relay" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/install-relay" ><span class="devsite-nav-text" tooltip>Install Relay</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/android-project-setup" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/android-project-setup" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/android-project-setup" ><span class="devsite-nav-text" tooltip>Set up your Android project</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Basic tutorial</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/basic-tutorial" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/basic-tutorial" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/basic-tutorial" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/create-ui-package-in-figma" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/create-ui-package-in-figma" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/create-ui-package-in-figma" ><span class="devsite-nav-text" tooltip>Create UI Package in Figma</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/convert-designs-android-studio" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/convert-designs-android-studio" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/convert-designs-android-studio" ><span class="devsite-nav-text" tooltip>Convert the designs to code in Android Studio</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/design-updates" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/design-updates" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/design-updates" ><span class="devsite-nav-text" tooltip>Make and propagate design updates</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/content-parameters" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/content-parameters" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/content-parameters" ><span class="devsite-nav-text" tooltip>Content parameters</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Advanced tutorial</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/advanced-tutorial" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/advanced-tutorial" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/advanced-tutorial" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/design-variants" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/design-variants" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/design-variants" ><span class="devsite-nav-text" tooltip>Handling design variants</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/content-parameters-advanced" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/content-parameters-advanced" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/content-parameters-advanced" ><span class="devsite-nav-text" tooltip>Content parameters</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/interaction-handlers" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/interaction-handlers" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/interaction-handlers" ><span class="devsite-nav-text" tooltip>Add interaction handlers to designs</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Relay workflow</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/relay-workflow" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/relay-workflow" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/relay-workflow" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/create-ui-packages" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/create-ui-packages" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/create-ui-packages" ><span class="devsite-nav-text" tooltip>Create UI Packages</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/add-parameters" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/add-parameters" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/add-parameters" ><span class="devsite-nav-text" tooltip>Add parameters</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/check-errors" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/check-errors" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/check-errors" ><span class="devsite-nav-text" tooltip>Check errors</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/share-ui-packages" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/share-ui-packages" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/share-ui-packages" ><span class="devsite-nav-text" tooltip>Share UI Packages</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/android-studio-workflow" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/android-studio-workflow" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/android-studio-workflow" ><span class="devsite-nav-text" tooltip>Android Studio workflow</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/understand-ui-package" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/understand-ui-package" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/understand-ui-package" ><span class="devsite-nav-text" tooltip>Understand UI Package & generated code</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/figma-devmode" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/figma-devmode" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/figma-devmode" ><span class="devsite-nav-text" tooltip>Figma DevMode</span></a></li></ul></div></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Design-to-code translation details</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/figma-component-properties" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/figma-component-properties" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/figma-component-properties" ><span class="devsite-nav-text" tooltip>Figma Component Properties</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/children-parameters" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/children-parameters" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/children-parameters" ><span class="devsite-nav-text" tooltip>Children parameters</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/nested-package-instances" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/nested-package-instances" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/nested-package-instances" ><span class="devsite-nav-text" tooltip>Nested package instances</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/vector-graphics" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/vector-graphics" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/vector-graphics" ><span class="devsite-nav-text" tooltip>Vector graphics</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/multiple-styles-in-text" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/multiple-styles-in-text" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/multiple-styles-in-text" ><span class="devsite-nav-text" tooltip>Multiple styles in text</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/absolute-positioning" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/absolute-positioning" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/absolute-positioning" ><span class="devsite-nav-text" tooltip>Absolute positioning within auto layout</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/fill-color" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/fill-color" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/fill-color" ><span class="devsite-nav-text" tooltip>Fill color</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/effects" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/effects" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/effects" ><span class="devsite-nav-text" tooltip>Effects</span></a></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/limitations-and-troubleshooting" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/limitations-and-troubleshooting" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/limitations-and-troubleshooting" ><span class="devsite-nav-text" tooltip>Limitations and troubleshooting</span></a></li><li class="devsite-nav-item devsite-nav-expandable"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Experimental features</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/mapping-styles-to-compose-theme" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/mapping-styles-to-compose-theme" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/mapping-styles-to-compose-theme" ><span class="devsite-nav-text" tooltip>Mapping styles to Compose theme</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/mapping-components-to-existing-code" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/mapping-components-to-existing-code" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/mapping-components-to-existing-code" ><span class="devsite-nav-text" tooltip>Mapping components to existing code</span></a></li></ul></div></li><li class="devsite-nav-item"><a href="/develop/ui/compose/tooling/relay/releases" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/tooling/relay/releases" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/tooling/relay/releases" ><span class="devsite-nav-text" tooltip>Releases</span></a></li></ul></div></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Leverage system capabilities</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/layouts/insets" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/layouts/insets" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/layouts/insets" ><span class="devsite-nav-text" tooltip>Window Insets</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/system/cutouts" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/system/cutouts" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/system/cutouts" ><span class="devsite-nav-text" tooltip>Cutouts</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/system/picture-in-picture" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/system/picture-in-picture" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/system/picture-in-picture" ><span class="devsite-nav-text" tooltip>Picture-in-picture</span></a></li></ul></div></li> <li class="devsite-nav-item devsite-nav-expandable devsite-nav-accordion"><div class="devsite-expandable-nav"> <a class="devsite-nav-toggle" aria-hidden="true"></a><div class="devsite-nav-title devsite-nav-title-no-path" tabindex="0" role="button"> <span class="devsite-nav-text" tooltip>Create widgets</span> </div><ul class="devsite-nav-section"><li class="devsite-nav-item"><a href="/develop/ui/compose/glance" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance" ><span class="devsite-nav-text" tooltip>Overview</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/setup" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/setup" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/setup" ><span class="devsite-nav-text" tooltip>Glance setup</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/create-app-widget" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/create-app-widget" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/create-app-widget" ><span class="devsite-nav-text" tooltip>Create an app widget with Glance</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/error-handling" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/error-handling" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/error-handling" ><span class="devsite-nav-text" tooltip>Handle errors with Glance</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/testing" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/testing" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/testing" ><span class="devsite-nav-text" tooltip>Unit testing with Glance</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/user-interaction" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/user-interaction" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/user-interaction" ><span class="devsite-nav-text" tooltip>Handle user interaction with Glance</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/glance-app-widget" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/glance-app-widget" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/glance-app-widget" ><span class="devsite-nav-text" tooltip>Manage and update GlanceAppWidget</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/build-ui" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/build-ui" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/build-ui" ><span class="devsite-nav-text" tooltip>Build UI with Glance</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/theme" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/theme" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/theme" ><span class="devsite-nav-text" tooltip>Implement a Glance theme</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/interoperability" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/interoperability" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/interoperability" ><span class="devsite-nav-text" tooltip>Glance interoperability</span></a></li><li class="devsite-nav-item"><a href="/develop/ui/compose/glance/additional-resources" class="devsite-nav-title gc-analytics-event" data-category="Site-Wide Custom Events" data-label="Book nav link, pathname: /develop/ui/compose/glance/additional-resources" track-type="bookNav" track-name="click" track-metadata-eventdetail="/develop/ui/compose/glance/additional-resources" ><span class="devsite-nav-text" tooltip>Additional resources</span></a></li></ul></div></li> </ul> <ul class="devsite-nav-list" menu="Essentials" aria-label="Side menu" hidden> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Gemini in Android Studio </span> </span> </li> <li class="devsite-nav-item"> <a href="/gemini-in-android" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Learn more" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Learn more </span> </a> </li> <li class="devsite-nav-item"> <a href="/studio" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Get Android Studio" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Get Android Studio </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Get started </span> </span> </li> <li class="devsite-nav-item"> <a href="/get-started/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Hello world" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Hello world </span> </a> </li> <li class="devsite-nav-item"> <a href="/courses" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Training courses" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Training courses </span> </a> </li> <li class="devsite-nav-item"> <a href="/get-started/codelabs" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Tutorials" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Tutorials </span> </a> </li> <li class="devsite-nav-item"> <a href="/kotlin" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Kotlin for Android" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Kotlin for Android </span> </a> </li> <li class="devsite-nav-item"> <a href="https://play.google.com/console/about/guides/monetize/" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Monetization with Play ↗️" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Monetization with Play ↗️ </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Extend by device </span> </span> </li> <li class="devsite-nav-item"> <a href="/adaptive-apps" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Adaptive apps" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Adaptive apps </span> </a> </li> <li class="devsite-nav-item"> <a href="/wear" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Wear OS" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Wear OS </span> </a> </li> <li class="devsite-nav-item"> <a href="/cars" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Android for Cars" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Android for Cars </span> </a> </li> <li class="devsite-nav-item"> <a href="/tv" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Android TV" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Android TV </span> </a> </li> <li class="devsite-nav-item"> <a href="/chrome-os" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: ChromeOS" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > ChromeOS </span> </a> </li> <li class="devsite-nav-item"> <a href="/multi-device-development" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Cross-device SDK" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Cross-device SDK </span> </a> </li> <li class="devsite-nav-item devsite-nav-heading"> <span class="devsite-nav-title" tooltip > <span class="devsite-nav-text" tooltip > Build by category </span> </span> </li> <li class="devsite-nav-item"> <a href="/games" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Games" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Games </span> </a> </li> <li class="devsite-nav-item"> <a href="/media" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Camera & Media" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Camera & Media </span> </a> </li> <li class="devsite-nav-item"> <a href="/social-and-messaging" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Social & messaging" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Social & messaging </span> </a> </li> <li class="devsite-nav-item"> <a href="/health-and-fitness" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Health & Fitness" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Health & Fitness </span> </a> </li> <li class="devsite-nav-item"> <a href="/productivity" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Productivity" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Productivity </span> </a> </li> <li class="devsite-nav-item"> <a href="/work/overview" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Enterprise apps" track-type="navMenu" track-metadata-eventDetail="globalMenu" 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tooltip > <span class="devsite-nav-text" tooltip > Architecture </span> </span> </li> <li class="devsite-nav-item"> <a href="/topic/architecture/intro" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Introduction" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Introduction </span> </a> </li> <li class="devsite-nav-item"> <a href="/topic/libraries/view-binding" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: Libraries" track-type="navMenu" track-metadata-eventDetail="globalMenu" track-metadata-position="nav"> <span class="devsite-nav-text" tooltip > Libraries </span> </a> </li> <li class="devsite-nav-item"> <a href="/guide/navigation/navigation-principles" class="devsite-nav-title gc-analytics-event " data-category="Site-Wide Custom Events" data-label="Responsive Tab: 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</devsite-thumb-rating> </div> <h1 class="devsite-page-title" tabindex="-1"> Kotlin for Jetpack Compose </h1> <devsite-feature-tooltip ack-key="AckCollectionsBookmarkTooltipDismiss" analytics-category="Site-Wide Custom Events" analytics-action-show="Callout Profile displayed" analytics-action-close="Callout Profile dismissed" analytics-label="Create Collection Callout" class="devsite-page-bookmark-tooltip nocontent" dismiss-button="true" id="devsite-collections-dropdown" dismiss-button-text="Dismiss" 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> <div class="devsite-page-title-meta"><devsite-view-release-notes></devsite-view-release-notes></div> <devsite-toc class="devsite-nav" depth="2" devsite-toc-embedded > </devsite-toc> <devsite-recommendations-dropdown class="nocontent"></devsite-recommendations-dropdown> <div class="devsite-article-body clearfix "> <p>Jetpack Compose is built around Kotlin. In some cases, Kotlin provides special idioms that make it easier to write good Compose code. If you think in another programming language and mentally translate that language to Kotlin, you're likely to miss out on some of the strength of Compose, and you might find it difficult to understand idiomatically-written Kotlin code. Gaining more familiarity with Kotlin's style can help you avoid those pitfalls.</p> <h2 id="default-args" data-text="Default arguments" tabindex="-1">Default arguments</h2> <p>When you write a Kotlin function, you can specify <em><a href="https://kotlinlang.org/docs/reference/functions.html#default-arguments">default values for function arguments</a></em>, used if the caller doesn't explicitly pass those values. This feature reduces the need for overloaded functions.</p> <p>For example, suppose you want to write a function that draws a square. That function might have a single required parameter, <strong>sideLength</strong>, specifying the length of each side. It might have several optional parameters, like <strong>thickness</strong>, <strong>edgeColor</strong> and so on; if the caller doesn't specify those, the function uses default values. In other languages, you might expect to write several functions:</p> <pre class="prettyprint lang-java notranslate" dir="ltr"> // We don't need to do this in Kotlin! void drawSquare(int sideLength) { } void drawSquare(int sideLength, int thickness) { } void drawSquare(int sideLength, int thickness, Color edgeColor) { }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/JavaSnippets.java#L22-L27" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/JavaSnippets.java#android_compose_kotlin_java_default_arguments" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/JavaSnippets.java" data-region-tag="android_compose_kotlin_java_default_arguments">JavaSnippets.java</a></div> </pre> <p>In Kotlin, you can write a single function and specify the default values for the arguments:</p> <p> <pre id="android_compose_kotlin_default_arguments-code-sample" data-scope="android_compose_kotlin_default_arguments" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_default_arguments" data-copy-event-label="android_compose_kotlin_default_arguments-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">fun drawSquare( sideLength: Int, thickness: Int = 2, edgeColor: Color = Color.Black ) { }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L65-L70" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_default_arguments" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_default_arguments">KotlinSnippets.kt</a></div></pre></p> <p>Besides saving you from having to write multiple redundant functions, this feature makes your code much clearer to read. If the caller doesn't specify a value for an argument, that indicates that they're willing to use the default value. In addition, the named parameters make it much easier to see what's going on. If you look at the code and see a function call like this, you might not know what the parameters mean without checking the <code translate="no" dir="ltr">drawSquare()</code> code:</p> <pre class="prettyprint lang-java notranslate" dir="ltr"> drawSquare(30, 5, Color.Red);<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/JavaSnippets.java#L32-L32" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/JavaSnippets.java#android_compose_kotlin_java_call" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/JavaSnippets.java" data-region-tag="android_compose_kotlin_java_call">JavaSnippets.java</a></div> </pre> <p>By contrast, this code is self-documenting:</p> <p> <pre id="android_compose_kotlin_function_call-code-sample" data-scope="android_compose_kotlin_function_call" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_function_call" data-copy-event-label="android_compose_kotlin_function_call-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">drawSquare(sideLength = 30, thickness = 5, edgeColor = Color.Red)<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L75-L75" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_function_call" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_function_call">KotlinSnippets.kt</a></div></pre></p> <p>Most Compose libraries use default arguments, and it's a good practice to do the same for the composable functions that you write. This practice makes your composables customizable, but still makes the default behavior simple to invoke. So, for example, you might create a simple text element like this:</p> <p> <pre id="android_compose_kotlin_function_call_composable_default-code-sample" data-scope="android_compose_kotlin_function_call_composable_default" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_function_call_composable_default" data-copy-event-label="android_compose_kotlin_function_call_composable_default-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Text(text = "Hello, Android!")<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L82-L82" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_function_call_composable_default" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_function_call_composable_default">KotlinSnippets.kt</a></div></pre></p> <p>That code has the same effect as the following, much more verbose code, in which more of the <a href="/reference/kotlin/androidx/compose/material/package-summary#Text(kotlin.String,androidx.compose.ui.Modifier,androidx.compose.ui.graphics.Color,androidx.compose.ui.unit.TextUnit,androidx.compose.ui.text.font.FontStyle,androidx.compose.ui.text.font.FontWeight,androidx.compose.ui.text.font.FontFamily,androidx.compose.ui.unit.TextUnit,androidx.compose.ui.text.style.TextDecoration,androidx.compose.ui.text.style.TextAlign,androidx.compose.ui.unit.TextUnit,androidx.compose.ui.text.style.TextOverflow,kotlin.Boolean,kotlin.Int,kotlin.Function1,androidx.compose.ui.text.TextStyle)"><code translate="no" dir="ltr">Text</code></a> parameters are set explicitly:</p> <p> <pre id="android_compose_kotlin_function_call_composable_named_parameters-code-sample" data-scope="android_compose_kotlin_function_call_composable_named_parameters" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_function_call_composable_named_parameters" data-copy-event-label="android_compose_kotlin_function_call_composable_named_parameters-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Text( text = "Hello, Android!", color = Color.Unspecified, fontSize = TextUnit.Unspecified, letterSpacing = TextUnit.Unspecified, overflow = TextOverflow.Clip )<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L86-L92" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_function_call_composable_named_parameters" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_function_call_composable_named_parameters">KotlinSnippets.kt</a></div></pre></p> <p>Not only is the first code snippet much simpler and easier to read, it's also self-documenting. By specifying only the <code translate="no" dir="ltr">text</code> parameter, you document that for all the other parameters, you want to use the default values. By contrast, the second snippet implies that you want to explicitly set the values for those other parameters, though the values you set happen to be the default values for the function.</p> <h2 id="higher-order" data-text="Higher-order functions and lambda expressions" tabindex="-1">Higher-order functions and lambda expressions</h2> <p>Kotlin supports <a href="https://kotlinlang.org/docs/reference/lambdas.html"><em>higher-order functions</em></a>, functions that receive other functions as parameters. Compose builds upon this approach. For example, the <a href="/reference/kotlin/androidx/compose/material/package-summary#Button(kotlin.Function0,androidx.compose.ui.Modifier,kotlin.Boolean,androidx.compose.foundation.interaction.MutableInteractionSource,androidx.compose.material.ButtonElevation,androidx.compose.ui.graphics.Shape,androidx.compose.foundation.BorderStroke,androidx.compose.material.ButtonColors,androidx.compose.foundation.layout.PaddingValues,kotlin.Function1)"><code translate="no" dir="ltr">Button</code></a> composable function provides an <code translate="no" dir="ltr">onClick</code> lambda parameter. The value of that parameter is a function, which the button calls when the user clicks it:</p> <p> <pre id="android_compose_kotlin_high_order_function-code-sample" data-scope="android_compose_kotlin_high_order_function" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_high_order_function" data-copy-event-label="android_compose_kotlin_high_order_function-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Button( // ... onClick = myClickFunction ) // ...<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L99-L105" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_high_order_function" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_high_order_function">KotlinSnippets.kt</a></div></pre></p> <p>Higher-order functions pair naturally with <em>lambda expressions</em>, expressions which evaluate to a function. If you only need the function once, you don't have to define it elsewhere to pass it to the higher-order function. Instead, you can just define the function right there with a lambda expression. The previous example assumes that <code translate="no" dir="ltr">myClickFunction()</code> is defined elsewhere. But if you only use that function here, it's simpler to just define the function inline with a lambda expression:</p> <p> <pre id="android_compose_kotlin_high_order_function_lambda-code-sample" data-scope="android_compose_kotlin_high_order_function_lambda" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_high_order_function_lambda" data-copy-event-label="android_compose_kotlin_high_order_function_lambda-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Button( // ... onClick = { // do something // do something else } ) { /* ... */ }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L109-L115" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_high_order_function_lambda" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_high_order_function_lambda">KotlinSnippets.kt</a></div></pre></p> <h3 id="trailing-lambdas" data-text="Trailing lambdas" tabindex="-1">Trailing lambdas</h3> <p>Kotlin offers a special syntax for calling higher-order functions whose <em>last</em> parameter is a lambda. If you want to pass a lambda expression as that parameter, you can use <a href="https://kotlinlang.org/docs/lambdas.html#passing-trailing-lambdas"><em>trailing lambda syntax</em></a>. Instead of putting the lambda expression within the parentheses, you put it afterwards. This is a common situation in Compose, so you need to be familiar with how the code looks.</p> <p>For example, the last parameter to all layouts, such as the <a href="/reference/kotlin/androidx/compose/foundation/layout/package-summary#Column(androidx.compose.ui.Modifier,androidx.compose.foundation.layout.Arrangement.Vertical,androidx.compose.ui.Alignment.Horizontal,kotlin.Function1)"><code translate="no" dir="ltr">Column()</code></a> composable function, is <code translate="no" dir="ltr">content</code>, a function which emits the child UI elements. Suppose you wanted to create a column containing three text elements, and you need to apply some formatting. This code would work, but it's very cumbersome:</p> <p> <pre id="android_compose_kotlin_trailing_lambda-code-sample" data-scope="android_compose_kotlin_trailing_lambda" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_trailing_lambda" data-copy-event-label="android_compose_kotlin_trailing_lambda-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Column( modifier = Modifier.padding(16.dp), content = { Text("Some text") Text("Some more text") Text("Last text") } )<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L122-L129" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_trailing_lambda" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_trailing_lambda">KotlinSnippets.kt</a></div></pre></p> <p>Because the <code translate="no" dir="ltr">content</code> parameter is the last one in the function signature, and we're passing its value as a lambda expression, we can pull it out of the parentheses:</p> <p> <pre id="android_compose_kotlin_trailing_lambda_content-code-sample" data-scope="android_compose_kotlin_trailing_lambda_content" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_trailing_lambda_content" data-copy-event-label="android_compose_kotlin_trailing_lambda_content-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Column(modifier = Modifier.padding(16.dp)) { Text("Some text") Text("Some more text") Text("Last text") }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L133-L137" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_trailing_lambda_content" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_trailing_lambda_content">KotlinSnippets.kt</a></div></pre></p> <p>The two examples have exactly the same meaning. The braces define the lambda expression that is passed to the <code translate="no" dir="ltr">content</code> parameter.</p> <p>In fact, if the <em>only</em> parameter you're passing is that trailing lambda—that is, if the final parameter is a lambda, and you aren't passing any other parameters—you can omit the parentheses altogether. So, for example, suppose you didn't need to pass a modifier to the <code translate="no" dir="ltr">Column</code>. You could write the code like this:</p> <p> <pre id="android_compose_kotlin_one_parameter-code-sample" data-scope="android_compose_kotlin_one_parameter" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_one_parameter" data-copy-event-label="android_compose_kotlin_one_parameter-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Column { Text("Some text") Text("Some more text") Text("Last text") }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L141-L145" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_one_parameter" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_one_parameter">KotlinSnippets.kt</a></div></pre></p> <p>This syntax is quite common in Compose, especially for layout elements like <code translate="no" dir="ltr">Column</code>. The last parameter is a lambda expression defining the element's children, and those children are specified in braces after the function call.</p> <h2 id="scopes" data-text="Scopes and receivers" tabindex="-1">Scopes and receivers</h2> <p>Some methods and properties are only available in a certain scope. The limited scope lets you offer functionality where it's needed and avoid accidentally using that functionality where it isn't appropriate.</p> <p>Consider an example used in Compose. When you call the <code translate="no" dir="ltr">Row</code> layout composable, your content lambda is automatically invoked within a <code translate="no" dir="ltr">RowScope</code>. This enables <code translate="no" dir="ltr">Row</code> to expose functionality which is only valid within a <code translate="no" dir="ltr">Row</code>. The example below demonstrates how <code translate="no" dir="ltr">Row</code> has exposed a row-specific value for the <code translate="no" dir="ltr">align</code> modifier:</p> <p> <pre id="android_compose_kotlin_row_scope-code-sample" data-scope="android_compose_kotlin_row_scope" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_row_scope" data-copy-event-label="android_compose_kotlin_row_scope-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Row { Text( text = "Hello world", // This Text is inside a RowScope so it has access to // Alignment.CenterVertically but not to // Alignment.CenterHorizontally, which would be available // in a ColumnScope. modifier = Modifier.align(Alignment.CenterVertically) ) }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L152-L161" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_row_scope" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_row_scope">KotlinSnippets.kt</a></div></pre></p> <p>Some APIs accept lambdas which are called in <em>receiver scope</em>. Those lambdas have access to properties and functions that are defined elsewhere, based on the parameter declaration:</p> <p> <pre id="android_compose_kotlin_receiver_scope-code-sample" data-scope="android_compose_kotlin_receiver_scope" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_receiver_scope" data-copy-event-label="android_compose_kotlin_receiver_scope-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Box( modifier = Modifier.drawBehind { // This method accepts a lambda of type DrawScope.() -> Unit // therefore in this lambda we can access properties and functions // available from DrawScope, such as the `drawRectangle` function. drawRect( /*...*/ /* ... ) } )<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L165-L175" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_receiver_scope" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_receiver_scope">KotlinSnippets.kt</a></div></pre></p> <p>For more information, see <a href="https://kotlinlang.org/docs/reference/lambdas.html#function-literals-with-receiver">function literals with receiver</a> in the Kotlin documentation.</p> <h2 id="delegated" data-text="Delegated properties" tabindex="-1">Delegated properties</h2> <p>Kotlin supports <a href="https://kotlinlang.org/docs/reference/delegated-properties.html">delegated properties</a>. These properties are called as if they were fields, but their value is determined dynamically by evaluating an expression. You can recognize these properties by their use of the <code translate="no" dir="ltr">by</code> syntax:</p> <p> <pre id="android_compose_kotlin_delegating_class-code-sample" data-scope="android_compose_kotlin_delegating_class" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_delegating_class" data-copy-event-label="android_compose_kotlin_delegating_class-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">class DelegatingClass { var name: String by nameGetterFunction() // ... }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L180-L188" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_delegating_class" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_delegating_class">KotlinSnippets.kt</a></div></pre></p> <p>Other code can access the property with code like this:</p> <p> <pre id="android_compose_kotlin_delegate_access-code-sample" data-scope="android_compose_kotlin_delegate_access" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_delegate_access" data-copy-event-label="android_compose_kotlin_delegate_access-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">val myDC = DelegatingClass() println("The name property is: " + myDC.name)<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L193-L194" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_delegate_access" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_delegate_access">KotlinSnippets.kt</a></div></pre></p> <p>When <code translate="no" dir="ltr">println()</code> executes, <code translate="no" dir="ltr">nameGetterFunction()</code> is called to return the value of the string.</p> <p>These delegated properties are particularly useful when you're working with state-backed properties:</p> <p> <pre id="android_compose_kotlin_delegated_properties-code-sample" data-scope="android_compose_kotlin_delegated_properties" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_delegated_properties" data-copy-event-label="android_compose_kotlin_delegated_properties-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">var showDialog by remember { mutableStateOf(false) } // Updating the var automatically triggers a state change showDialog = true<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L201-L204" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_delegated_properties" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_delegated_properties">KotlinSnippets.kt</a></div></pre></p> <aside class="note"><strong>Note:</strong><span> Learn more about <code translate="no" dir="ltr">remember</code> and <code translate="no" dir="ltr">mutableStateOf</code> in the <a href="/develop/ui/compose/state">State in Jetpack Compose documentation</a>.</span></aside> <h2 id="destructuring" data-text="Destructuring data classes" tabindex="-1">Destructuring data classes</h2> <p>If you define a <a href="https://kotlinlang.org/docs/reference/data-classes.html">data class</a>, you can easily access the data with a <a href="https://kotlinlang.org/docs/reference/multi-declarations.html">destructuring declaration</a>. For example, suppose you define a <code translate="no" dir="ltr">Person</code> class:</p> <p> <pre id="android_compose_kotlin_data_class-code-sample" data-scope="android_compose_kotlin_data_class" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_data_class" data-copy-event-label="android_compose_kotlin_data_class-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">data class Person(val name: String, val age: Int)<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L209-L209" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_data_class" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_data_class">KotlinSnippets.kt</a></div></pre></p> <p>If you have an object of that type, you can access its values with code like this:</p> <p> <pre id="android_compose_kotlin_destructuring-code-sample" data-scope="android_compose_kotlin_destructuring" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_destructuring" data-copy-event-label="android_compose_kotlin_destructuring-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">val mary = Person(name = "Mary", age = 35) // ... val (name, age) = mary<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L214-L218" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_destructuring" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_destructuring">KotlinSnippets.kt</a></div></pre></p> <p>You'll often see that kind of code in Compose functions:</p> <p> <pre id="android_compose_kotlin_destructuring_compose-code-sample" data-scope="android_compose_kotlin_destructuring_compose" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_destructuring_compose" data-copy-event-label="android_compose_kotlin_destructuring_compose-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Row { val (image, title, subtitle) = createRefs() // The `createRefs` function returns a data object; // the first three components are extracted into the // image, title, and subtitle variables. // ... }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L225-L234" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_destructuring_compose" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_destructuring_compose">KotlinSnippets.kt</a></div></pre></p> <p>Data classes provide a lot of other useful functionality. For example, when you define a data class, the compiler automatically defines useful functions like <code translate="no" dir="ltr">equals()</code> and <code translate="no" dir="ltr">copy()</code>. You can find more information in the <a href="https://kotlinlang.org/docs/reference/data-classes.html">data classes</a> documentation.</p> <h2 id="singletons" data-text="Singleton objects" tabindex="-1">Singleton objects</h2> <p>Kotlin makes it easy to declare <em>singletons</em>, classes which always have one and only one instance. These singletons are declared with the <a href="https://kotlinlang.org/docs/reference/object-declarations.html#object-declarations"><code translate="no" dir="ltr">object</code> keyword</a>. Compose often makes use of such objects. For example, <a href="/reference/kotlin/androidx/compose/material/MaterialTheme"><code translate="no" dir="ltr">MaterialTheme</code></a> is defined as a singleton object; the <code translate="no" dir="ltr">MaterialTheme.colors</code>, <code translate="no" dir="ltr">shapes</code>, and <code translate="no" dir="ltr">typography</code> properties all contain the values for the current theme.</p> <h2 id="dsl" data-text="Type-safe builders and DSLs" tabindex="-1">Type-safe builders and DSLs</h2> <p>Kotlin allows creating <a href="https://wikipedia.org/wiki/Domain-specific_language" class="external">domain-specific languages (DSLs)</a> with type-safe builders. DSLs allow building complex hierarchical data structures in a more maintainable and readable way.</p> <p>Jetpack Compose uses DSLs for some APIs such as <a href="/reference/kotlin/androidx/compose/foundation/lazy/package-summary#LazyRow(androidx.compose.ui.Modifier,androidx.compose.foundation.lazy.LazyListState,androidx.compose.foundation.layout.PaddingValues,kotlin.Boolean,androidx.compose.foundation.layout.Arrangement.Horizontal,androidx.compose.ui.Alignment.Vertical,androidx.compose.foundation.gestures.FlingBehavior,kotlin.Function1)"><code translate="no" dir="ltr">LazyRow</code></a> and <a href="/reference/kotlin/androidx/compose/foundation/lazy/package-summary#LazyColumn(androidx.compose.ui.Modifier,androidx.compose.foundation.lazy.LazyListState,androidx.compose.foundation.layout.PaddingValues,kotlin.Boolean,androidx.compose.foundation.layout.Arrangement.Vertical,androidx.compose.ui.Alignment.Horizontal,androidx.compose.foundation.gestures.FlingBehavior,kotlin.Function1)"><code translate="no" dir="ltr">LazyColumn</code></a>.</p> <p> <pre id="android_compose_kotlin_dsl-code-sample" data-scope="android_compose_kotlin_dsl" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_dsl" data-copy-event-label="android_compose_kotlin_dsl-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">@Composable fun MessageList(messages: List<Message>) { LazyColumn { // Add a single item as a header item { Text("Message List") } // Add list of messages items(messages) { message -> Message(message) } } }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L241-L254" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_dsl" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_dsl">KotlinSnippets.kt</a></div></pre></p> <p>Kotlin guarantees type-safe builders using <a href="https://kotlinlang.org/docs/lambdas.html#function-literals-with-receiver" class="external">function literals with receiver</a>. If we take the <a href="/reference/kotlin/androidx/compose/foundation/package-summary#Canvas(androidx.compose.ui.Modifier,kotlin.Function1)"><code translate="no" dir="ltr">Canvas</code></a> composable as example, it takes as a parameter a function with <a href="/reference/kotlin/androidx/compose/ui/graphics/drawscope/DrawScope"><code translate="no" dir="ltr">DrawScope</code></a> as the receiver, <code translate="no" dir="ltr">onDraw: DrawScope.() -> Unit</code>, allowing the block of code to call member functions defined in <code translate="no" dir="ltr">DrawScope</code>.</p> <p> <pre id="android_compose_kotlin_receiver-code-sample" data-scope="android_compose_kotlin_receiver" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_receiver" data-copy-event-label="android_compose_kotlin_receiver-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">Canvas(Modifier.size(120.dp)) { // Draw grey background, drawRect function is provided by the receiver drawRect(color = Color.Gray) // Inset content by 10 pixels on the left/right sides // and 12 by the top/bottom inset(10.0f, 12.0f) { val quadrantSize = size / 2.0f // Draw a rectangle within the inset bounds drawRect( size = quadrantSize, color = Color.Red ) rotate(45.0f) { drawRect(size = quadrantSize, color = Color.Blue) } } }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L260-L279" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_receiver" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_receiver">KotlinSnippets.kt</a></div></pre></p> <p>Learn more about type-safe builders and DSLs in <a href="https://kotlinlang.org/docs/type-safe-builders.html" class="external">Kotlin's documentation</a>.</p> <h2 id="coroutines" data-text="Kotlin coroutines" tabindex="-1">Kotlin coroutines</h2> <p>Coroutines offer asynchronous programming support at the language level in Kotlin. Coroutines can <em>suspend</em> execution without blocking threads. A responsive UI is inherently asynchronous, and Jetpack Compose solves this by embracing coroutines at the API level instead of using callbacks.</p> <p>Jetpack Compose offers APIs that make using coroutines safe within the UI layer. The <a href="/reference/kotlin/androidx/compose/runtime/package-summary#rememberCoroutineScope(kotlin.Function0)"><code translate="no" dir="ltr">rememberCoroutineScope</code></a> function returns a <a href="https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-coroutine-scope/"><code translate="no" dir="ltr">CoroutineScope</code></a> with which you can create coroutines in event handlers and call Compose suspend APIs. See the example below using the <a href="/reference/kotlin/androidx/compose/foundation/ScrollState"><code translate="no" dir="ltr">ScrollState</code></a>'s <code translate="no" dir="ltr">animateScrollTo</code> API.</p> <p> <pre id="android_compose_kotlin_coroutines-code-sample" data-scope="android_compose_kotlin_coroutines" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_coroutines" data-copy-event-label="android_compose_kotlin_coroutines-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">// Create a CoroutineScope that follows this composable's lifecycle val composableScope = rememberCoroutineScope() Button( // ... onClick = { // Create a new coroutine that scrolls to the top of the list // and call the ViewModel to load data composableScope.launch { scrollState.animateScrollTo(0) // This is a suspend function viewModel.loadData() } } ) { /* ... */ }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L290-L302" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_coroutines" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_coroutines">KotlinSnippets.kt</a></div></pre></p> <p>Coroutines execute the block of code <em>sequentially</em> by default. A running coroutine that calls a suspend function <em>suspends</em> its execution until the suspend function returns. This is true even if the suspend function moves the execution to a different <code translate="no" dir="ltr">CoroutineDispatcher</code>. In the previous example, <code translate="no" dir="ltr">loadData</code> won't be executed until the suspend function <code translate="no" dir="ltr">animateScrollTo</code> returns.</p> <p>To execute code concurrently, new coroutines need to be created. In the example above, to parallelize scrolling to the top of the screen and loading data from <code translate="no" dir="ltr">viewModel</code>, two coroutines are needed.</p> <p> <pre id="android_compose_kotlin_coroutines_concurrent-code-sample" data-scope="android_compose_kotlin_coroutines_concurrent" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_coroutines_concurrent" data-copy-event-label="android_compose_kotlin_coroutines_concurrent-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">// Create a CoroutineScope that follows this composable's lifecycle val composableScope = rememberCoroutineScope() Button( // ... onClick = { // Scroll to the top and load data in parallel by creating a new // coroutine per independent work to do composableScope.launch { scrollState.animateScrollTo(0) } composableScope.launch { viewModel.loadData() } } ) { /* ... */ }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L309-L322" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_coroutines_concurrent" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_coroutines_concurrent">KotlinSnippets.kt</a></div></pre></p> <p>Coroutines make it easier to combine asynchronous APIs. In the following example, we combine the <code translate="no" dir="ltr">pointerInput</code> modifier with the animation APIs to animate the position of an element when the user taps on the screen.</p> <p> <pre id="android_compose_kotlin_coroutines_animate-code-sample" data-scope="android_compose_kotlin_coroutines_animate" data-code-snippet="true" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_coroutines_animate" data-copy-event-label="android_compose_kotlin_coroutines_animate-KotlinSnippets" class="prettyprint lang-kotlin notranslate" dir="ltr">@Composable fun MoveBoxWhereTapped() { // Creates an `Animatable` to animate Offset and `remember` it. val animatedOffset = remember { Animatable(Offset(0f, 0f), Offset.VectorConverter) } Box( // The pointerInput modifier takes a suspend block of code Modifier .fillMaxSize() .pointerInput(Unit) { // Create a new CoroutineScope to be able to create new // coroutines inside a suspend function coroutineScope { while (true) { // Wait for the user to tap on the screen val offset = awaitPointerEventScope { awaitFirstDown().position } // Launch a new coroutine to asynchronously animate to // where the user tapped on the screen launch { // Animate to the pressed position animatedOffset.animateTo(offset) } } } } ) { Text("Tap anywhere", Modifier.align(Alignment.Center)) Box( Modifier .offset { // Use the animated offset as the offset of this Box IntOffset( animatedOffset.value.x.roundToInt(), animatedOffset.value.y.roundToInt() ) } .size(40.dp) .background(Color(0xff3c1361), CircleShape) ) }<div class="devsite-github-link nocode no-select"><a target="_top" href="https://github.com/android/snippets/blob/f4e49876ac3fad90376323fa23b6991581d547c7/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#L327-L370" class="gc-analytics-event" data-category="github_link" data-label="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt#android_compose_kotlin_coroutines_animate" data-code-snippet="true" data-git-revision="main" data-github-path="android/snippets/compose/snippets/src/main/java/com/example/compose/snippets/kotlin/KotlinSnippets.kt" data-region-tag="android_compose_kotlin_coroutines_animate">KotlinSnippets.kt</a></div></pre></p> <p>To learn more about Coroutines, check out the <a href="/kotlin/coroutines">Kotlin coroutines on Android</a> guide.</p> <devsite-recommendations> <h2 id="recommended_for_you" data-text="Recommended for you" tabindex="-1">Recommended for you</h2> <ul> <li>Note: link text is displayed when JavaScript is off</li> <li><a href="/develop/ui/compose/layouts/material">Material Components and layouts</a></li> <li><a href="/develop/ui/compose/side-effects">Side-effects in Compose</a></li> <li><a href="/develop/ui/compose/layouts/basics">Compose layout basics</a></li> </ul> </devsite-recommendations> <devsite-hats-survey class="nocontent" hats-id="m71UDKaJT0kxBYCLVTd0U6CJGcqa" listnr-id="5207477"></devsite-hats-survey> </div> <devsite-recommendations display="in-page" hidden yield> </devsite-recommendations> <devsite-thumb-rating position="footer"> </devsite-thumb-rating> <devsite-recommendations id="recommendations-link" yield></devsite-recommendations> <div class="devsite-floating-action-buttons"> </div> </article> <devsite-content-footer class="nocontent"> <p>Content and code samples on this page are subject to the licenses described in the <a href="/license">Content License</a>. 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