Jetpack Compose Academy · 课时

AnnotatedString：富文本

在单个 Text 块中设置不同文字片段的样式。

AnnotatedString：富文本 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。

One Text, Many Styles

Sometimes one word in a sentence needs to stand out. AnnotatedString lets you style spans inside a single Text composable.

Why Not Two Texts

You could split words into separate Texts, but they would wrap awkwardly. AnnotatedString keeps everything as one flowing, naturally wrapping line.

Build It with buildAnnotatedString

Create rich text using the buildAnnotatedString builder. Inside it you append plain text and styled sections in the order you want them shown.

val s = buildAnnotatedString {
    append("Hello ")
}

Append Plain Text

Use append to add normal characters. Calls stack up in sequence, so the final string reads exactly in the order you appended.

append("Welcome, ")
append("friend")

Style a Span

Wrap part of the text in withStyle and give it a SpanStyle. Everything appended inside that block gets that style applied.

withStyle(SpanStyle(fontWeight = FontWeight.Bold)) {
    append("important")
}

SpanStyle Options

A SpanStyle can set color, fontWeight, fontStyle, fontSize, and more, so each span can look completely different from its neighbors.

SpanStyle(color = Color.Blue,
          fontWeight = FontWeight.Bold)

Render It in Text

Pass your finished AnnotatedString straight to Text, just like a plain string. Compose draws every styled span in place.

Text(text = annotatedGreeting)

Mix Bold and Color

Combine spans freely: a bold red word next to a normal sentence. Each withStyle block only affects the text appended inside it. 🙂

ParagraphStyle for Blocks

For line-level changes like alignment or spacing, use ParagraphStyle instead of SpanStyle. It styles whole paragraphs, not single words.

Tag Clickable Words

You can attach a LinkAnnotation so part of the text becomes tappable, perfect for inline links or a Terms of Service line.

Rich Text, One Element

AnnotatedString gives you mixed styling, links, and emphasis in a single Text. It is how you build natural, expressive copy.

Quick Check

You want one word bold inside a normal sentence in a single Text. What do you use?

Recap

You built rich text with buildAnnotatedString, styling spans via withStyle and SpanStyle. One Text can now hold many looks at once. 🎉

常见问题解答

「AnnotatedString：富文本」课时是免费的吗？

是的 — 「AnnotatedString：富文本」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。

「AnnotatedString：富文本」这节课中我会学到什么？

在单个 Text 块中设置不同文字片段的样式。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。

「AnnotatedString：富文本」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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