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Column：垂直堆叠元素

将子元素从上到下排列。

Column：垂直堆叠元素 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。

Stacking Vertically

When you want children to sit top to bottom, you reach for Column. It is Compose's go-to layout for vertical stacks. 📚

Your First Column

A Column takes a trailing lambda. Every Composable you call inside it becomes a child, drawn in the order you write them.

Column {
    Text("First")
    Text("Second")
}

Order Is Top to Bottom

Children stack in source order. The first Composable sits at the top, the next below it, and so on down the screen.

Mixing Different Children

A Column can hold any Composables, not just Text. Buttons, Images, and even other Columns all stack happily inside it.

Column {
    Text("Title")
    Button(onClick = {}) { Text("Go") }
}

Default Sizing: Wrap Content

By default a Column is only as tall and wide as its children need. It shrinks to wrap its content unless you tell it otherwise.

Filling the Width

Add a Modifier to change size. fillMaxWidth makes the Column stretch across the whole screen horizontally.

Column(modifier = Modifier.fillMaxWidth()) {
    Text("Wide column")
}

Spacing Between Children

Use verticalArrangement with spacedBy to put even gaps between every child. No manual padding on each item needed.

Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
    Text("A")
    Text("B")
}

Aligning Children Sideways

Set horizontalAlignment to line children up. CenterHorizontally pulls them all to the middle of the Column's width.

Column(horizontalAlignment = Alignment.CenterHorizontally) {
    Text("Centered")
}

Columns Don't Scroll Yet

A plain Column does not scroll. If children run past the screen they get clipped, so it suits short, fixed lists best.

Adding Scroll When Needed

For longer content, attach verticalScroll to the Column's modifier. Now the whole stack scrolls as one piece.

Column(modifier = Modifier.verticalScroll(rememberScrollState())) {
    Text("Long content")
}

Nesting for Real Screens

Real screens nest Columns inside Columns. An outer Column holds sections, and each section is its own little Column of details.

Quick Check

Let's confirm how a Column arranges its children.

Recap: Column

You learned Column: it stacks children top to bottom in order, wraps content by default, and uses arrangement, alignment, and modifiers to size and space them.

常见问题解答

「Column：垂直堆叠元素」课时是免费的吗？

是的 — 「Column：垂直堆叠元素」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。

「Column：垂直堆叠元素」这节课中我会学到什么？

将子元素从上到下排列。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。

「Column：垂直堆叠元素」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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