Annotated String resources in Kotlin and for Jetpack Compose UI

Results.md

The code below renders the following text in both Android Views and in Jetpack Compose UI.

Contact our team on 555 555 555 Opt 3 to activate.

StringComposables.kt

@Composable
fun annotatedStringResource(@StringRes id: Int, vararg formatArgs: Any): AnnotatedString {
    val resources = LocalContext.current.resources
    return remember(id) {
        val text = resources.getText(id, *formatArgs)
        spannableStringToAnnotatedString(text)
    }
}

@Composable
fun annotatedStringResource(@StringRes id: Int): AnnotatedString {
    val resources = LocalContext.current.resources
    return remember(id) {
        val text = resources.getText(id)
        spannableStringToAnnotatedString(text)
    }
}

private fun spannableStringToAnnotatedString(text: CharSequence): AnnotatedString {
    return if (text is Spanned) {
        val spanStyles = mutableListOf<AnnotatedString.Range<SpanStyle>>()
        spanStyles.addAll(text.getSpans(0, text.length, UnderlineSpan::class.java).map {
            AnnotatedString.Range(
                SpanStyle(textDecoration = TextDecoration.Underline),
                text.getSpanStart(it),
                text.getSpanEnd(it)
            )
        })
        spanStyles.addAll(text.getSpans(0, text.length, StyleSpan::class.java).map {
            AnnotatedString.Range(
                SpanStyle(fontWeight = FontWeight.Bold),
                text.getSpanStart(it),
                text.getSpanEnd(it)
            )
        })
        AnnotatedString(text.toString(), spanStyles = spanStyles)
    } else {
        AnnotatedString(text.toString())
    }
}

strings.xml

<string name="launch_awaiting_instructions">Contact <b>our</b> team on %1$s to activate.</string>
<string name="support_contact_phone_number"><b>555 555 555</b> Opt <b>3</b></string>

StringUtils.kt

fun Spanned.toHtmlWithoutParagraphs(): String {
    return HtmlCompat.toHtml(this, HtmlCompat.TO_HTML_PARAGRAPH_LINES_CONSECUTIVE)
        .substringAfter("<p dir=\"ltr\">").substringBeforeLast("</p>")
}

fun Resources.getText(@StringRes id: Int, vararg args: Any): CharSequence {
    val escapedArgs = args.map {
        if (it is Spanned) it.toHtmlWithoutParagraphs() else it
    }.toTypedArray()
    val resource = SpannedString(getText(id))
    val htmlResource = resource.toHtmlWithoutParagraphs()
    val formattedHtml = String.format(htmlResource, *escapedArgs)
    return HtmlCompat.fromHtml(formattedHtml, HtmlCompat.FROM_HTML_MODE_LEGACY)
}

I think the @ReadOnlyComposable should eliminate need for remember.