排列与对齐
精确定位子元素并设置间距。
排列与对齐 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。
Two Words, Two Jobs
Layout control comes down to arrangement and alignment. They sound similar but they do different jobs. Let's untangle them. 🧭
Arrangement: Along the Main Axis
Arrangement controls spacing along the layout's main axis: vertical for a Column, horizontal for a Row.
Alignment: Across the Cross Axis
Alignment controls position on the other axis: horizontal in a Column, vertical in a Row. It lines children up sideways.
Grouping at One End
Arrangement.Top, Center, and Bottom pack children together at one end of a Column, leaving the rest as empty space.
Column(verticalArrangement = Arrangement.Center) {
Text("A")
Text("B")
}Spreading Children Out
Use SpaceBetween, SpaceAround, or SpaceEvenly to distribute extra space among children instead of bunching them up.
Row(horizontalArrangement = Arrangement.SpaceEvenly) {
Text("A")
Text("B")
Text("C")
}SpaceBetween vs SpaceEvenly
SpaceBetween hugs the edges with no outer gaps, while SpaceEvenly adds equal gaps everywhere, including before the first and after the last child.
Fixed Gaps with spacedBy
For a consistent gap, use Arrangement.spacedBy. It inserts the exact distance you give between every adjacent child.
Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
Text("A")
Text("B")
}Column's Cross-Axis Alignment
In a Column the cross axis is horizontal, so horizontalAlignment chooses Start, CenterHorizontally, or End for the children.
Column(horizontalAlignment = Alignment.End) {
Text("Right side")
}Row's Cross-Axis Alignment
In a Row the cross axis is vertical, so verticalAlignment picks Top, CenterVertically, or Bottom for the children.
Row(verticalAlignment = Alignment.Bottom) {
Text("Aligned bottom")
}Combine Both for Layout
You usually set both at once: arrangement spaces children along the main axis while alignment positions them on the cross axis.
Column(
verticalArrangement = Arrangement.Center,
horizontalAlignment = Alignment.CenterHorizontally
) { Text("Dead center") }Effect Needs Extra Space
Arrangement only shows when the container is bigger than its children. A wrap-content Column has no spare room to redistribute.
Quick Check
Let's confirm which axis each setting controls.
Recap: Arrangement & Alignment
You learned the split: arrangement spaces children along the main axis, alignment positions them on the cross axis. Combine both for precise layouts.
常见问题解答
「排列与对齐」课时是免费的吗？
是的 — 「排列与对齐」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。
「排列与对齐」这节课中我会学到什么？
精确定位子元素并设置间距。 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。
「排列与对齐」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。