Wear OS 实现了符合 Web 内容无障碍指南 (WCAG)-AAA 的主题设置系统，该系统源自两个指定的种子颜色。具体而言，这些种子颜色是主调色板和第三色调板的基础。系统会使用这两种初始颜色生成一个包含主色、辅色、第三色和 Surface 调色板的全面调色板。随后，系统会将此生成的主题应用于 Wear OS 组件、系统界面元素、功能块和应用。
由于界面最终可能会使用任意数量的不同来源颜色，因此最好先使用基准配色方案进行设计，以确保将正确的颜色角色映射到产品中的正确组件。使用 Material Theme Builder 查看您的界面模拟在各种来源颜色的呈现效果，并根据需要调整设置。
调色板（基于表盘种子颜色）
应用于功能块的颜色主题
应用于应用屏幕的颜色主题
来自品牌颜色
与 Material 3 Expressive 处理颜色角色的方式类似，Wear OS 通过动态且易于访问的颜色表达方式将颜色应用于个性化体验。Wear OS 仅使用深色主题，因为穿戴式设备界面是基于黑色背景构建的。作为一个在触摸设备上运行的平台，Wear OS 的调色板也更有限，因为它不需要那么多的悬停和聚焦状态。使用专为 Wear OS 打造的颜色主题构建工具，围绕您的品牌构建自定义主题，并生成支持 Material Design 令牌且可与系统界面组件无缝协作的完整参考调色板和分配的颜色角色。
[null,null,["最后更新时间 (UTC)：2025-07-27。"],[],[],null,["# Color system\n\nThe Material 3 Expressive color framework uses dynamic color theming, based on\ntwo seed colors mapped on the HCT (Hue, Chroma and Tone) color system.\n\nEssential terms\n---------------\n\nColor role\n: Like the \"numbers\" on a paint-by-number canvas, color roles are assigned to\n specific UI elements. They have names like primary, on primary, and primary\n container. The same color role is used for both light and dark themes. See all\n color roles\n\nHCT\n: HCT stands for hue, chroma, and tone.\n\nDefine colors with hue, chroma, and tone (HCT)\n----------------------------------------------\n\nHCT color generator creating a set of color palettes from one seed color to\ncreates a three-dimensional color model that defines colors based on their hue\n(color), chroma (saturation), and tone (lightness)\n\nThere are three main accents colors: primary, secondary and tertiary. Neutral\nshades, such as various tones of gray with a hint of primary color, are ideal\nfor use as container colors for rich content due to their monochromatic nature.\n\n### Hue\n\n\nHue is the perception of a color, such as red, orange, yellow, green, blue, and\nviolet. Hue is quantified by a number ranging from 0-360 and is a circular\nspectrum (values 0 and 360 are the same hue). \n\n\u003cbr /\u003e\n\n### Chroma\n\n\nChroma is how colorful or neutral (gray, black or white) a color appears. Chroma\nis quantified by a number ranging from 0 (completely gray, black or white) to\ninfinity (most vibrant), though chroma values in HCT top out at roughly 120.\n\nBecause of biological and screen rendering limitations, different hues and\ndifferent tones will have different maximal chroma values. \n\n\u003cbr /\u003e\n\n### Tone\n\n\nTone is how light or dark a color appears. Tone is sometimes also referred to as\n*luminance*. Tone is quantified by a number ranging from 0 (pure black, no\nluminance) to 100 (pure white, complete luminance).\n\nTone is crucial for visual accessibility because it determines contrast. Colors\nwith a greater difference in tone create higher contrast, while those with a\nsmaller difference create lower contrast. \n\n\u003cbr /\u003e\n\nDynamic color (color theming)\n-----------------------------\n\nWear OS implements a theming system compliant with [Web Content Accessibility\nGuidelines (WCAG)-AAA](https://www.w3.org/TR/WCAG22/#contrast-enhanced), derived from two designated *seed\ncolors*. Specifically, these seed colors serve as the basis for primary and\ntertiary palettes. Using these two initial colors, the system generates a\ncomprehensive color palette encompassing primary, secondary, tertiary, and\nsurface palettes. Subsequently, this generated theme is applied across Wear OS\ncomponents, System UI elements, tiles, and apps.\nEach Watch face defines two seed colors, used for primary and tertiary palettes.\n\n\u003cbr /\u003e\n\nThese seeds are put through an algorithm that becomes five tonal ranges, specific tones (based on luminance) are slotted into the predefined roles that consist of a scheme. Colors are mapped to a scheme through design tokens.\n\n\u003cbr /\u003e\n\nEach design token is then applied to the SysUI, tiles and apps that have opted in to using dynamic color.\n\n\u003cbr /\u003e\n\nDepending on your preference, you can use either a specific seed color or a\nbrand color to derive your dynamic color.\n\n### From seed color\n\nDynamic color will automatically create an accessible color scheme based on a\nspecific seed color.\n\nBecause the UI could end up with any number of different source colors, it's\nbest to initially design using the baseline color scheme so you can ensure the\nright color roles are mapped to the right components in your product. Use the\nMaterial Theme Builder to see how your UI mocks look across a range of source\ncolors and adjust settings as needed.\n\n\nColor palette (from Watch face seed colors) \n\nColor theme applied to a Tile \n\nColor theme applied to an app screen\n\n\u003cbr /\u003e\n\n\u003cbr /\u003e\n\n### From brand color\n\nSimilar to the way Material 3 Expressive treats color roles, Wear OS applies\ncolor to individualized experiences with dynamic and accessible color\nexpression. Wear OS uses only the dark theme because the wearable interface is\nbuilt on a black background. Being a platform that runs on touch devices, Wear\nOS also has a more limited color palette as it doesn't require as many hover and\nfocus states. Use the Wear OS-specific color theme building tools to build a\ncustom theme around your brand and generate the full reference palettes and\nassigned color roles that support Material Design tokens and are built to work\nseamlessly with system UI components.\n\n\nColor palette (from artwork seed colors) \n\nColor theme applied to a Tile \n\nColor theme applied to an app screen\n\n\u003cbr /\u003e"]]
