Vertical SeekBar for Android

VerticalSeekbar.kt

class VerticalSeekBar @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : AppCompatSeekBar(context, attrs, defStyleAttr) {

    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
        super.onSizeChanged(h, w, oldh, oldw)
    }

    override fun setProgress(progress: Int) {
        val oldWidth = width
        val oldHeight = height
        super.setProgress(progress)
        onSizeChanged(width, height, oldWidth, oldHeight)
    }

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        super.onMeasure(heightMeasureSpec, widthMeasureSpec)
        setMeasuredDimension(measuredHeight, measuredWidth)
    }

    override fun onDraw(canvas: Canvas) {
        canvas.rotate(-90f)
        canvas.translate(-height.toFloat(), 0f)
        super.onDraw(canvas)
    }

    override fun onTouchEvent(event: MotionEvent): Boolean {
        if (!isEnabled) {
            return false
        }
        when (event.action) {
            ACTION_DOWN, ACTION_MOVE, ACTION_UP -> {
                progress = max - (max * event.y / height).toInt()
            }
        }
        return true
    }
}

Source (c) /user/SoMuchSpaceJunk