【Android高级UI】将View或Layout裁剪为任意形状

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需求

• 将View裁剪为指定形状

• 将Layout裁剪为指定形状，并且Children不能超过裁剪范围

应用

• 圆角图片
• 异形图片
• 圆角Layout

方案

通过ViewOutlineProvider裁剪控件范围

实现

fun View.getMeasureSize(): Size {val widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)val heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)measure(widthSpec, heightSpec)return Size(measuredWidth, measuredHeight)
}fun View.clipToRoundRect(cornerRadius: Number) {outlineProvider = object : ViewOutlineProvider() {override fun getOutline(view: View, outline: Outline) {val measuredSize = view.getMeasureSize()outline.setRoundRect(0, 0, measuredSize.width, measuredSize.height, cornerRadius.toFloat())}}setClipToOutline(true)if (this is ViewGroup) {clipChildren = true}
}

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