如何在 Jetpack Compose 中勾勒文本

Question

I have a Jetpack Compose Text() element that I'd like to outline in black like so.
Anyone know how to do this? I've tried using the border() modifier, but that just adds a border around the rectangular area containing the text. I've also tried overlaying two text elements, but that doesn't quite work either.

Answer 1

You can use a Canvas and the drawIntoCanvas function.

Something like:

Canvas(
    modifier = Modifier.fillMaxSize(),
    onDraw = {
                drawIntoCanvas {
                    it.nativeCanvas.drawText(
                        "Sample",
                        0f,
                        120.dp.toPx(),
                        textPaintStroke
                    )
                    it.nativeCanvas.drawText(
                        "Sample",
                        0f,
                        120.dp.toPx(),
                        textPaint
                    )
                }
            }
)

with these Paint :

val textPaintStroke = Paint().asFrameworkPaint().apply {
    isAntiAlias = true
    style = android.graphics.Paint.Style.STROKE
    textSize = 64f
    color = android.graphics.Color.BLACK
    strokeWidth = 12f
    strokeMiter= 10f
    strokeJoin = android.graphics.Paint.Join.ROUND
}

val textPaint = Paint().asFrameworkPaint().apply {
    isAntiAlias = true
    style = android.graphics.Paint.Style.FILL
    textSize = 64f
    color = android.graphics.Color.WHITE
}