Canvas
来实现。我曾经这样做过,可以为你提供一个起点来实现你想要的东西...@Composable
fun DrawGradientCircles() {
Canvas(
modifier = Modifier
.size(300.dp)
.background(Color.Gray)
) {
drawCircle(
brush = Brush.sweepGradient(listOf(Color.Magenta, Color.Red)),
radius = 300f,
style = Stroke(90f)
)
drawCircle(
brush = Brush.sweepGradient(listOf(Color.Green, Color.Yellow)),
radius = 200f,
style = Stroke(90f)
)
drawCircle(
brush = Brush.sweepGradient(listOf(Color.Cyan, Color.Blue)),
radius = 100f,
style = Stroke(90f)
)
}
}
编辑:我在这里发布了更新版本:
https://gist.github.com/nglauber/e947dacf50155fb72408e83f6595e430
希望能帮到您。我使用CircularProgressIndicator成功完成了它。
@Composable
fun ringView(){
var sz by remember { mutableStateOf(Size.Zero)}
Box(
Modifier
.aspectRatio(1f)
.fillMaxSize()
.background(Color.Blue)
.onGloballyPositioned { coordinates ->
sz = coordinates.size.toSize()
}
, contentAlignment = Alignment.Center){
Box(Modifier.aspectRatio(1f), contentAlignment = Alignment.Center){
Text(text = pxToDp(sz.height.toInt()).toString())
CircularProgressIndicator(progress = 0.9F, Modifier.size(pxToDp(sz.width.toInt()).dp), strokeWidth = (pxToDp(sz.width.toInt())/15).dp,color = Color.Green)
CircularProgressIndicator(progress = 0.9F, Modifier.size((pxToDp(sz.width.toInt())-(2*(pxToDp(sz.width.toInt())/15))).dp), strokeWidth = (pxToDp(sz.width.toInt())/15).dp, color = Color.Black )
CircularProgressIndicator(progress = 0.9F, Modifier.size((pxToDp(sz.width.toInt())-(4*(pxToDp(sz.width.toInt())/15))).dp), strokeWidth = (pxToDp(sz.width.toInt())/15).dp, color = Color.Gray )
CircularProgressIndicator(progress = 0.9F, Modifier.size((pxToDp(sz.width.toInt())-(6*(pxToDp(sz.width.toInt())/15))).dp), strokeWidth = (pxToDp(sz.width.toInt())/15).dp, color = Color.Cyan )
CircularProgressIndicator(progress = 0.9F, Modifier.size((pxToDp(sz.width.toInt())-(8*(pxToDp(sz.width.toInt())/15))).dp), strokeWidth = (pxToDp(sz.width.toInt())/15).dp, color = Color.Magenta )
}
}
}
fun pxToDp(px: Int): Int {
return (px / Resources.getSystem().displayMetrics.density).toInt()
}
Canvas
中有一个DrawScope
,它具有size
属性。如果你需要相对尺寸,请在Canvas
内部使用size
。 - Gabriele Mariotti