一、背景
在使用Compose实现Button按钮时，设计要求移除按钮的水波纹效果，只保留按压效果，经查Compose1.4.3版本中，并没有直接移除水波纹的能力
二、遇到问题
经过多次尝试，使用Compose的Button组件始终无法实现目标效果，使用Box+Text 最终绘制的效果Text显示的颜色和字间距又和Button效果渲染的不一致，
三、效果演示
这里就不演示了。代码在下面，你试试就知道效果了
三、实现方案
经过多次失败后，看了一下Compose的Button组件源码，找到问题所在。最终得出以下效果实现代码
@Composable
fun ButtonBlackOutline(modifier: Modifier = Modifier, content: String, onClick: () -> Unit) {var isPressed by remember { mutableStateOf(false) }var buttonRect by remember { mutableStateOf(Rect.Zero) }Box(modifier = modifier.background(color = if (isPressed) colorResource(id = CommonColor.common_pressed_btn_color) else colorResource(id = CommonColor.color_transparent),shape = RoundedCornerShape(100.dp)).fillMaxWidth().height(40.dp).border(0.5.dp, colorResource(id = CommonColor.text_600), RoundedCornerShape(100.dp)).pointerInteropFilter {when (it.action) {MotionEvent.ACTION_DOWN -> {isPressed = true}MotionEvent.ACTION_UP -> {if (buttonRect.contains(offset = Offset(it.x, it.y))) {isPressed = trueonClick()} else {isPressed = false}}MotionEvent.ACTION_CANCEL -> {isPressed = false}MotionEvent.ACTION_MOVE -> {if (buttonRect.contains(offset = Offset(it.x, it.y))) {isPressed = true} else {isPressed = false}}}true}.onGloballyPositioned { coordinates ->buttonRect = Rect(offset = coordinates.positionInWindow(),size = coordinates.size.toSize())},contentAlignment = Alignment.Center,content = {// 实现和Button效果一致的重要代码CompositionLocalProvider(LocalContentAlpha provides ButtonDefaults.buttonColors().contentColor(enabled = true).value.alpha) {ProvideTextStyle(value = MaterialTheme.typography.button) {Text(text = content)}}})
}
