How to draw a multicolored bar with Canvas in Jetpack Compose?

How to attain a UI like this in Compose?

Suppose there is a list of slices:

data class Slice(val value: Float, val color: Color)

Group-1 is 14.6, Red

Group-2 is 61.8, Blue

Group-3 is 23.6, Green

Total 100.0

Canvas is not necessary anyhow.

Updated your Slice data class to contain text to draw Text too. You can remove it if you don't want to draw text

data class Slice(val value: Float, val color: Color, val text: String = "")

And Canvas to draw rectangles and text

@OptIn(ExperimentalTextApi::class)
@Composable
private fun StackedBar(modifier: Modifier, slices: List<Slice>) {

    val textMeasurer = rememberTextMeasurer()

    val textLayoutResults = remember {
        mutableListOf<TextLayoutResult>().apply {
            slices.forEach {
                val textLayoutResult: TextLayoutResult =
                    textMeasurer.measure(
                        text = AnnotatedString(it.text),
                        style = TextStyle(
                            color = Color.White,
                            fontSize = 18.sp
                        )
                    )
                add(textLayoutResult)
            }
        }
    }

    Canvas(modifier = modifier) {
        val canvasWidth = size.width
        val canvasHeight = size.height

        var currentX = 0f
        slices.forEachIndexed { index: Int, slice: Slice ->
            val width = (slice.value) / 100f * canvasWidth

            // Draw Rectangles
            drawRect(
                color = slice.color, topLeft = Offset(currentX, 0f), size = Size(
                    width,
                    canvasHeight
                )
            )

            // Draw Text
            val textSize = textLayoutResults[index].size
            val style = textLayoutResults[index].layoutInput.style
            drawText(
                textMeasurer = textMeasurer, text = slice.text, topLeft = Offset(
                    x = currentX + (width - textSize.height) / 2,
                    y = (canvasHeight - textSize.height) / 2
                ),
                style = style
            )

            // Update start position of next rectangle
            currentX += width
        }
    }
}

Usage

Column {
    val slices = listOf(
        Slice(value = 14.6f, color = Color.Red, text = "55"),
        Slice(value = 61.8f, color = Color.Blue, text = "233"),
        Slice(value = 23.6f, color = Color.Green, text = "89")
    )

    StackedBar(
        modifier = Modifier
            .fillMaxWidth()
            .height(100.dp),
        slices = slices
    )
}

Result

Landscape