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构建自定义设计系统

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构建自定义设计系统 是 CoddyKit 上的免费 Jetpack Compose Academy 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Jetpack Compose Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Jetpack Compose Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Beyond the Defaults

Real brands need more than Material's built-ins. A design system bundles your colors, type, shapes, and extra tokens into one reusable theme. 🏗️

Wrap MaterialTheme

You start by writing your own AppTheme Composable that configures MaterialTheme, giving the whole app a single, named entry point.

@Composable
fun AppTheme(content: @Composable () -> Unit) { /* ... */ }

Pass Your Tokens In

Inside AppTheme you hand MaterialTheme your custom colorScheme, typography, and shapes, so every screen inherits your brand automatically.

MaterialTheme(
  colorScheme = brandColors,
  typography = brandType,
  shapes = brandShapes
) { content() }

Material Misses Some Tokens

Some brand values, like a success green or a custom spacing unit, have no Material role. You add these as your own extra tokens.

Hold Extra Colors

You group extra colors in a small data class, a tidy home for brand values Material does not provide out of the box.

data class BrandColors(
  val success: Color,
  val warning: Color
)

CompositionLocal

To share custom tokens down the tree without passing parameters, you use a CompositionLocal, Compose's built-in ambient value mechanism.

Create the Local

You declare a staticCompositionLocalOf with a default, creating a channel any Composable can read your brand colors from.

val LocalBrand = staticCompositionLocalOf { defaultBrand }

Provide the Values

In AppTheme you wrap content in a CompositionLocalProvider, feeding your brand tokens into the tree alongside MaterialTheme.

CompositionLocalProvider(LocalBrand provides brand) {
  MaterialTheme(/* ... */) { content() }
}

Read Custom Tokens

Anywhere below, a Composable reads LocalBrand.current to grab your custom values, mirroring how MaterialTheme exposes its own.

val success = LocalBrand.current.success

Offer a Clean API

Many teams expose an object so calls read like AppTheme.brand.success, a friendly facade over the CompositionLocal underneath.

One Source of Truth

Now colors, type, shapes, and custom tokens all flow from a single theme, so the app stays consistent and effortless to evolve. ✨

Quick Check

You need a brand color Material has no role for, shared app-wide. What do you reach for?

Recap: Your Own Theme

You wrapped MaterialTheme in an AppTheme, added extra tokens via CompositionLocal, and gave your app one branded source of truth. 🎉

常见问题解答

「构建自定义设计系统」课时是免费的吗？

是的 — 「构建自定义设计系统」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Jetpack Compose Academy 课程的其余内容，请升级到 CoddyKit PRO。 Jetpack Compose Academy 课程共包含 4 节课。

「构建自定义设计系统」这节课中我会学到什么？

使用自己的令牌扩展主题。你通过在浏览器中直接运行的动手代码来练习 Jetpack Compose Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Jetpack Compose Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Jetpack Compose Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「构建自定义设计系统」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Jetpack Compose Academy 课中编写并运行代码吗？

能。每节 Jetpack Compose Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

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