Linkify with Compose Text

Question

I can't find how to linkify my Text() using Jetpack Compose.

Before compose all I had to do was:

Linkify.addLinks(myTextView, Linkify.EMAIL_ADDRESSES or Linkify.WEB_URLS)

And all the links contained in my TextView were becoming clickable links, obviously.

Important: The content of the Text is coming from an API and the links do not have a fixed position and content may contain multiple links.

I want to keep this behavior with using Jetpack Compose but I can't find any information about doing that.

Does anyone know?

Answer 1

In case someone is looking for a solution, the following will make any links clickable and styled in your text:

@Composable
fun LinkifyText(text: String, modifier: Modifier = Modifier) {
    val uriHandler = LocalUriHandler.current
    val layoutResult = remember {
        mutableStateOf<TextLayoutResult?>(null)
    }
    val linksList = extractUrls(text)
    val annotatedString = buildAnnotatedString {
        append(text)
        linksList.forEach {
            addStyle(
                style = SpanStyle(
                    color = Color.Companion.Blue,
                    textDecoration = TextDecoration.Underline
                ),
                start = it.start,
                end = it.end
            )
            addStringAnnotation(
                tag = "URL",
                annotation = it.url,
                start = it.start,
                end = it.end
            )
        }
    }
    Text(
        text = annotatedString, 
        style = MaterialTheme.typography.body1,
        onTextLayout = { layoutResult.value = it },
        modifier = modifier
            .pointerInput(Unit) {
                detectTapGestures { offsetPosition ->
                    layoutResult.value?.let {
                        val position = it.getOffsetForPosition(offsetPosition)
                        annotatedString.getStringAnnotations(position, position).firstOrNull()
                            ?.let { result ->
                                if (result.tag == "URL") {
                                    uriHandler.openUri(result.item)
                                }
                            }
                    }
                }
            }
    )
}

private val urlPattern: Pattern = Pattern.compile(
        "(?:^|[\\W])((ht|f)tp(s?):\\/\\/|www\\.)"
                + "(([\\w\\-]+\\.){1,}?([\\w\\-.~]+\\/?)*"
                + "[\\p{Alnum}.,%_=?&#\\-+()\\[\\]\\*$~@!:/{};']*)",
        Pattern.CASE_INSENSITIVE or Pattern.MULTILINE or Pattern.DOTALL
)

fun extractUrls(text: String): List<LinkInfos> {
    val matcher = urlPattern.matcher(text)
    var matchStart: Int
    var matchEnd: Int
    val links = arrayListOf<LinkInfos>()

    while (matcher.find()) {
        matchStart = matcher.start(1)
        matchEnd = matcher.end()

        var url = text.substring(matchStart, matchEnd)
        if (!url.startsWith("http://") && !url.startsWith("https://"))
            url = "https://$url"

        links.add(LinkInfos(url, matchStart, matchEnd))
    }
    return links
}

data class LinkInfos(
        val url: String,
        val start: Int,
        val end: Int
)