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LazyVerticalGrid 画廊

将项目排列到可滚动网格中。

第 1 / 4 课13 个步骤

LazyVerticalGrid 画廊 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。

Grids in Compose

When a screen full of photos needs neat rows and columns, you reach for LazyVerticalGrid. It scrolls vertically and only composes the cells you can see. 🖼️

Why Lazy?

Like LazyColumn, a lazy grid skips off-screen items. A thousand-image gallery stays smooth because Compose builds cells on demand, not all at once.

The Basic Setup

You give LazyVerticalGrid a column count and feed it items. Each item becomes one cell, and Compose flows them left to right, then down.

LazyVerticalGrid(columns = GridCells.Fixed(2)) {
    items(photos) { photo ->
        PhotoCell(photo)
    }
}

GridCells.Fixed

Use GridCells.Fixed(n) when you want an exact column count, like a tidy 3-across icon grid that never changes.

columns = GridCells.Fixed(3)

Spacing Between Cells

Add breathing room with Arrangement parameters. They control the gap between rows and the gap between columns separately.

LazyVerticalGrid(
    columns = GridCells.Fixed(2),
    verticalArrangement = Arrangement.spacedBy(8.dp),
    horizontalArrangement = Arrangement.spacedBy(8.dp)
) { }

Padding Around the Grid

Use contentPadding to inset the whole grid from the screen edges. It keeps the first and last cells from hugging the borders.

contentPadding = PaddingValues(16.dp)

Items From a List

The items builder takes your data list and a cell lambda. Each element of the list maps to exactly one composed cell.

items(galleryPhotos) { photo ->
    AsyncImage(model = photo.url, contentDescription = null)
}

A Single Special Cell

Need a header or a one-off cell? Use item (singular) for content that should not repeat over your list.

item { GalleryTitle() }
items(photos) { PhotoCell(it) }

Spanning Across Columns

A cell can stretch across the whole row with a span. This is perfect for a section title sitting above its photos.

item(span = { GridItemSpan(maxLineSpan) }) {
    SectionHeader("Recent")
}

Keep Cells Square

Photo galleries look best when cells are square. Apply aspectRatio(1f) to each cell so height tracks its width.

Box(Modifier.aspectRatio(1f)) { PhotoCell(photo) }

Grid vs List

Choose a grid when items are visual and equally weighted, like thumbnails. Choose a list when each row is a distinct, full-width record.

Quick Check

A quick one on column counts.

在交互式课程中回答

Recap: Grid Galleries

You met LazyVerticalGrid: lazy cells, a column count, spacing, padding, and spans. It is your go-to for scrollable photo galleries. ✨

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常见问题解答

「LazyVerticalGrid 画廊」课时是免费的吗？

是的 — 「LazyVerticalGrid 画廊」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。

「LazyVerticalGrid 画廊」这节课中我会学到什么？

将项目排列到可滚动网格中。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。

「LazyVerticalGrid 画廊」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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