如何在 Android Jetpack Compose 的文本行末尾显示省略号（三个点）？

Question

Whether I use androidx.compose.foundation.text.BasicText or androidx.compose.material.Text , if there isn't enough space for a text it wraps to the next line, for example:

@Composable
fun EllipsisExample() {
    Box(modifier = Modifier.width(160.dp)) {
        Text("Lorem ipsum dolor sit amet.")
    }
}

renders:

How could I force it to be a single line and draw ellipsis at the end of it? The result I want in this case is something like:

Lorem ipsum dolor s…

Answer 1

Both BasicText and Text have overflow and maxLines arguments which can help you.

Text(myText, maxLines = 1, overflow = TextOverflow.Ellipsis)

Here's a full single-line example:

import androidx.compose.material.Text
import androidx.compose.ui.text.style.TextOverflow

@Composable
fun EllipsisExample() {
    Box(modifier = Modifier.width(160.dp)) {
        Text(
            text = "Lorem ipsum dolor sit amet.",
            maxLines = 1,
            overflow = TextOverflow.Ellipsis
        )
    }
}

Of course you can tune maxLines to fit your needs:

Text(
    text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.",
    maxLines = 2,
    overflow = TextOverflow.Ellipsis
)

Answer 2

To show three dots, you need to give definite width param your root. In my case it is like that.

Column(modifier = Modifier.width(150.dp)) {
        MovieImage(
            url = movie.posterPath, modifier = Modifier
                .height(190.dp)
                .padding(8.dp)
                .clip(
                    RoundedCornerShape(CornerSize(8.dp))
                )
        )
        Text(
            text = movie.title,
            color = Color.White,
            modifier = Modifier.padding(8.dp),
            maxLines = 1,
            overflow = TextOverflow.Ellipsis
        )
}

Answer 3

You can set the overflow attribute in Text composable to TextOverflow.Ellipsis Ex:

Text(
    text = "Compose Previews are great to check quickly how a composable layout looks like",
    maxLines = 2,
    overflow = TextOverflow.Ellipsis
)

If you want to make the ellipsis dynamic you should use Compose's state APIs like remember and mutableStateOf , so any changes to state automatically update the UI

@Composable
fun MessageCard(msg: String) {
var isExpanded by remember { mutableStateOf(false) }
Text(
     text = msg,
     modifier = Modifier.padding(all = 4.dp),
     style = MaterialTheme.typography.body2,
     maxLines = if (isExpanded) Int.MAX_VALUE else 1,
     overflow = if (isExpanded) TextOverflow.Visible else TextOverflow.Ellipsis
    )
}