RecordButton_3.kt

private val radiusDiff = dpToPx(10).toFloat()

private val innerPaint = Paint().apply {
    color = Color.WHITE
    isAntiAlias = true
}
private val outerPaint = Paint().apply {
    color = Color.parseColor("#99FFFFFF")
    strokeWidth = radiusDiff.toFloat()
    style = Paint.Style.FILL
    isAntiAlias = true
}