Jetpack Compose Academy · 课时

统计信息行与关注按钮

为卡片添加交互细节。

统计信息行与关注按钮 是 CoddyKit 上的免费 Jetpack Compose Academy 课时。这是第 3 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。

Add the Interactive Details

With the header done, you will add the lower half: a row of stats and a follow button that responds to taps. This is where the card comes alive. ⚡

One Stat Block

Each stat is two stacked Texts: a big number and a small label. A tiny Column holds them together as one neat block.

Column(horizontalAlignment = Alignment.CenterHorizontally) {
    Text("128")
    Text("Posts")
}

Emphasize the Number

The count should pop while the label stays quiet. Give the number a bold style and the label a smaller one.

Text("128", style = MaterialTheme.typography.titleMedium)
Text("Posts", style = MaterialTheme.typography.labelSmall)

Put Stats in a Row

Three stat blocks sit side by side, so wrap them in a Row. Each block becomes a child laid out left to right.

Row {
    StatBlock("128", "Posts")
    StatBlock("4.2k", "Followers")
    StatBlock("180", "Following")
}

Space the Stats Evenly

Spread the blocks across the card with Arrangement.SpaceEvenly on the Row, so the gaps are equal and balanced.

Row(
    modifier = Modifier.fillMaxWidth(),
    horizontalArrangement = Arrangement.SpaceEvenly
) { /* ... */ }

Add the Follow Button

Below the stats, add a Button. Its onClick lambda runs your code the moment the user taps it.

Button(onClick = { /* follow */ }) {
    Text("Follow")
}

Make It Full Width

A primary action button reads best across the whole card. Add fillMaxWidth so it spans edge to edge.

Button(
    onClick = { /* follow */ },
    modifier = Modifier.fillMaxWidth()
) { Text("Follow") }

Track the Follow State

The button should toggle between Follow and Following. Hold that with remember and mutableStateOf so the UI reacts to taps.

var following by remember { mutableStateOf(false) }

Flip State on Tap

Inside onClick, flip the boolean. Compose notices the state changed and redraws the button with new text automatically.

Button(onClick = { following = !following }) {
    Text(if (following) "Following" else "Follow")
}

Wire It Into the Card

Drop the stats Row and the Button below the header inside the outer Column. The full card now reads top to bottom in order.

An Interactive Card

You now have stats, a follow button, and live state. Tapping really changes the screen, which is the heart of a declarative Compose UI. 🎉

Quick Check

What lets the button text update when tapped?

Recap: Stats and Action

You built a Row of evenly spaced stat blocks and a full-width follow button driven by remembered state. Next you will refactor it all into clean, reusable pieces.

常见问题解答

「统计信息行与关注按钮」课时是免费的吗？

是的 — 「统计信息行与关注按钮」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。

「统计信息行与关注按钮」这节课中我会学到什么？

为卡片添加交互细节。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 3 节课，共 4 节。

「统计信息行与关注按钮」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

← 返回 Jetpack Compose Academy