适用于 Wear OS 的 Material 3 Expressive 通过为其颜色角色分配不同的色相、色度和色调值来建立视觉层次结构，从而有效区分醒目强调色与中性 Surface 颜色。系统包含主色、辅色和第三色强调色角色，这不仅增强了表达能力，还通过独特的颜色选择，让您可以更精细地控制视觉层次结构。这种有意使用颜色的方式可确保手表界面保持一致且协调，即使采用主题设置也是如此。
[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["没有我需要的信息","missingTheInformationINeed","thumb-down"],["太复杂/步骤太多","tooComplicatedTooManySteps","thumb-down"],["内容需要更新","outOfDate","thumb-down"],["翻译问题","translationIssue","thumb-down"],["示例/代码问题","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC)：2025-07-27。"],[],[],null,["# Apply color\n\nMaterial 3 Expressive for Wear OS establishes visual hierarchy by assigning\ndifferent hue, chroma, and tone values to its color roles, effectively\ndistinguishing bold accent colors from neutral surface colors. The system's\ninclusion of primary, secondary, and tertiary accent roles not only enhances\nexpressive possibilities but also offers more granular control over visual\nhierarchy through distinct color choices. This intentional use of color ensures\na consistent and cohesive feel within the Watch UI, even with theming.\nExample of different layouts, components and UIs in various themes, but\nstill maintaining adequate color contrast.\n\nPair and layer colors\n---------------------\n\nTo maintain visual accessibility, apply colors only in the intended pairs color\ntokens. Combining colors improperly may break contrast necessary for visual\naccessibility, particularly when colors are adjusted through dynamic color.\n\n### Pair and layer colors correctly\n\nIn order to ensure proper visuals and accessibility, make sure you are mapping\nthe correct token to its correct position. An improper color mapping can lead to\nunintended visuals and break accessibility. \ncheck_circle\n\n### Do\n\n**Pair and layer color roles correctly to ensure proper\nvisuals and accessibility.**\n\nIn this example, buttons with (2)\n**on-primary** on (1) **primary** or (4) **on-primary** -container\non (3) **primary-container** stay legible as the contrast level changes\nand have an AAA rating with a contrast ratio of 7:1 or more. \ncancel\n\n### Don't\n\n**Improper color mappings can lead to unintended visuals\nand break accessibility.**\n\nIn this example, buttons with (2)\n**primary-container** on (1) **primary** or (4) **primary-dim** on\n(3) **primary-container** become illegible as contrast levels shift and\ndon't follow the 7:1 contrast ratio minimum for normal text. These contrast\nlevels apply to primary, secondary and tertiary roles.\n\n### Recommended color pairings\n\n\n**Primary + Primary Dim**\n\nUse Primary for main actions, and Primary-Dim for complementary items. This\ncreates depth while ensuring the primary action stands out. \n\n**Primary-Dim + Tertiary**\n\nUse Primary-Dim to highlight important elements and Tertiary to provide standout\nfeedback, such as tap responses. \n\n**Primary + Secondary-Container**\n\nUse Secondary-Container for less prominent content, while Primary is applied to\nkey elements to ensure they stand out and grab attention.\n\n\u003cbr /\u003e\n\n\n**Primary + Primary-Container**\n\nUse Primary for main actions, and Primary-Container for complementary or\nsecondary items. This creates depth while ensuring the primary action stands\nout. \n\n**Primary-Dim + Tertiary-Dim**\n\nUse Primary-Dim to highlight important elements and Tertiary-Dim to provide\nstandout feedback, such as a goal being met. \n\n**Tertiary + Primary + Secondary-Container**\n\nWhen it's not clear what the main action is, use a combination of Tertiary and\nPrimary for a main actions and Secondary-Container for a complementary actions.\n\n\u003cbr /\u003e\n\n\n**Secondary + Primary-Container**\n\nUse Primary-Dim and Secondary when you want to show two equally as important\noptions or containers, but still have contrast between the two. \n\n**Primary + Tertiary + Primary-Container**\n\nWhen it's not clear what the main action is, use a combination of Tertiary and\nPrimary for a main actions and Primary-Container for a complementary actions. \n\n**Primary + Tertiary-Dim**\n\nUse Primary for main actions and Primary Dim for complementary items. This\ncreates depth while helping the primary action to stand out.\n\n\u003cbr /\u003e"]]
