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深色模式与动态颜色

根据系统和壁纸调整颜色。

深色模式与动态颜色 是 CoddyKit 上的免费 Jetpack Compose Academy 课时。这是第 3 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。

Two Palettes, One App

A polished app ships both a light and a dark palette. You define them as separate colorScheme objects and switch between them at the theme level. 🌙

Detect the System Setting

You ask the system which mode is active with isSystemInDarkTheme, a Composable that returns true when the user prefers dark.

val dark = isSystemInDarkTheme()

Pick the Scheme

With that flag you choose which palette to pass into MaterialTheme, so the app follows the system dark mode setting automatically.

val scheme = if (dark) darkColorScheme()
  else lightColorScheme()

darkColorScheme Defaults

The darkColorScheme builder ships sensible low-light defaults, so even before customizing you get readable, comfortable dark surfaces.

Contrast Still Matters

In dark mode you keep the same color roles, but tune surfaces darker and on-colors lighter so text stays easy to read.

What Is Dynamic Color

Dynamic color is Material You magic: on Android 12 and up the system can derive your palette from the user's wallpaper. 🎨

Check the Android Version

Dynamic color needs API 31 or higher, so you gate it with a version check before reaching for the wallpaper-based scheme.

val supported = Build.VERSION.SDK_INT >= 31

Build a Dynamic Scheme

When supported, you call dynamicLightColorScheme or its dark variant with a context to pull colors straight from the wallpaper.

dynamicDarkColorScheme(context)

Always Have a Fallback

On older devices dynamic color is unavailable, so you fall back to your hand-crafted colorScheme to keep branding intact.

Wire It Together

Your theme picks dynamic when allowed, else dark or light by system setting, so one colorScheme choice handles every case.

val scheme = when {
  dynamicOk && dark -> dynamicDarkColorScheme(ctx)
  dark -> darkColorScheme()
  else -> lightColorScheme()
}

Test Both Modes

Preview your screens in light and dark, and on a colorful wallpaper, so dynamic color never surprises you with unreadable combos. ✨

Quick Check

A user on Android 13 sets a purple wallpaper. What can your theme do?

Recap: Adaptive, Personal Color

You detected the system mode with isSystemInDarkTheme, swapped palettes, and layered dynamic color with a safe fallback. 🎉

常见问题解答

「深色模式与动态颜色」课时是免费的吗？

是的 — 「深色模式与动态颜色」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。

「深色模式与动态颜色」这节课中我会学到什么？

根据系统和壁纸调整颜色。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 3 节课，共 4 节。

「深色模式与动态颜色」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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