Scaffold：屏幕骨架
连接标准应用布局的各个插槽。
Scaffold：屏幕骨架 是 CoddyKit 上的免费 Jetpack Compose Academy 课时。 这是第 1 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。
Meet Scaffold
Most app screens share the same skeleton: a bar on top, content in the middle, maybe a button floating below. Scaffold gives you all of that in one Composable. 🏗️
Why Not Just a Column?
You could hand-build bars with a Column, but you would re-solve insets, spacing, and overlaps every time. Scaffold wires those standard pieces together for you.
The Slot Idea
Scaffold works with slots: named spots where you drop a Composable. You fill the slots you want and leave the rest empty.
The content Slot
The one slot you almost always use is content. It is the main body of your screen, and Scaffold hands it the right padding to use.
Scaffold { innerPadding ->
Text("Hello", Modifier.padding(innerPadding))
}Honor innerPadding
That innerPadding keeps your content from hiding under bars. Always apply it to your top-level content, or text can slip beneath the app bar.
The topBar Slot
Drop a bar into the topBar slot and Scaffold pins it to the top, then shrinks the content area so nothing overlaps.
Scaffold(
topBar = { TopAppBar(title = { Text("Home") }) }
) { padding -> }More Slots Available
Scaffold also offers bottomBar, floatingActionButton, and snackbarHost slots. You will meet each one in this course.
Leave Slots Empty
Every slot is optional. A Scaffold with only content is perfectly valid, so you add bars only when a screen actually needs them.
One Scaffold Per Screen
The usual rule is one Scaffold per screen. It frames that whole screen, while smaller Composables fill its content slot.
Scaffold Is Material 3
Import Scaffold from androidx.compose.material3 so its colors and spacing match the rest of your Material You theme.
import androidx.compose.material3.ScaffoldcontainerColor
Set containerColor to paint the screen background behind every slot. Skip it and Scaffold uses your theme's surface color by default.
Quick Check
What is the safest thing to do with the value Scaffold passes to its content lambda?
Recap
Scaffold is your screen skeleton: fill named slots like content and topBar, honor innerPadding, and use one per screen. Next you will style the top bar. 👍
常见问题解答
「Scaffold：屏幕骨架」课时是免费的吗？
是的 — 「Scaffold：屏幕骨架」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。
「Scaffold：屏幕骨架」这节课中我会学到什么？
连接标准应用布局的各个插槽。 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 1 节课，共 4 节。
「Scaffold：屏幕骨架」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。