Jetpack Compose Academy · 课时

内边距、尺寸与 fillMaxWidth

控制 Composable 内部及周围的空间。

内边距、尺寸与 fillMaxWidth 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 the Modifier

A Modifier is how you adjust a Composable: its size, spacing, and decoration. You chain calls onto it, one tweak at a time. 🧩

Pass It In

Almost every Composable takes a modifier parameter. You pass it as the first thing to change about that element.

Text(
  text = "Hi",
  modifier = Modifier
)

Add Some Padding

Use padding to add empty space around a Composable. It pushes everything else away, giving your element room to breathe.

Text(
  "Hi",
  modifier = Modifier.padding(16.dp)
)

The dp Unit

Sizes use dp, density-independent pixels. They look the same on every screen, so 16.dp is consistent across phones and tablets.

Padding Per Side

You can pad each side differently. Pass horizontal and vertical, or name individual sides like start and top.

Modifier.padding(
  horizontal = 16.dp,
  vertical = 8.dp
)

Set a Fixed Size

Use size to give a Composable an exact width and height. One value makes it square; two values set each dimension.

Modifier.size(width = 120.dp, height = 48.dp)

Width and Height Alone

Need only one dimension? Use width or height on their own and let the other side wrap its content naturally.

Modifier.height(56.dp)

Fill the Width

fillMaxWidth stretches a Composable to take up all the horizontal space its parent offers. Great for full-width buttons and rows.

Modifier.fillMaxWidth()

Fill a Fraction

Pass a fraction to fill only part of the space. fillMaxWidth(0.5f) takes half the available width instead of all of it.

Modifier.fillMaxWidth(0.5f)

Fill Everything

Use fillMaxSize to expand in both directions at once. It is the shortcut for filling width and height together.

Modifier.fillMaxSize()

Chain Them Together

The real power is chaining: stack padding, size, and fill in one fluent call to shape an element exactly how you want.

Modifier
  .fillMaxWidth()
  .padding(16.dp)

Quick Check

Which modifier stretches a Composable across all the horizontal space its parent gives?

Recap

You learned to space, size, and stretch any Composable. padding adds room, size sets exact bounds, and fillMaxWidth grows to fit. ✨

常见问题解答

「内边距、尺寸与 fillMaxWidth」课时是免费的吗？

是的 — 「内边距、尺寸与 fillMaxWidth」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。

「内边距、尺寸与 fillMaxWidth」这节课中我会学到什么？

控制 Composable 内部及周围的空间。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。

「内边距、尺寸与 fillMaxWidth」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。

此课程中的所有课时

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