Final version of the ArcLayoutManager

ArcLayoutManager.kt

package com.omarkrostom.arclayoutmanager

import android.content.Context
import android.view.ViewGroup.LayoutParams.MATCH_PARENT
import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
import androidx.recyclerview.widget.RecyclerView
import kotlin.math.*

class ArcLayoutManager(
    private val context: Context,
    private var horizontalOffset: Int = 0
) : RecyclerView.LayoutManager() {
    override fun generateDefaultLayoutParams(): RecyclerView.LayoutParams =
        RecyclerView.LayoutParams(MATCH_PARENT, WRAP_CONTENT)

    override fun canScrollHorizontally(): Boolean = true

    override fun scrollHorizontallyBy(
        dx: Int,
        recycler: RecyclerView.Recycler?,
        state: RecyclerView.State?
    ): Int {
        horizontalOffset += dx
        fill(recycler, state)
        return dx
    }

    override fun onLayoutChildren(recycler: RecyclerView.Recycler?, state: RecyclerView.State?) {
        super.onLayoutChildren(recycler, state)

        fill(recycler, state)
    }

    private fun fill(recycler: RecyclerView.Recycler?, state: RecyclerView.State?) {
        detachAndScrapAttachedViews(recycler ?: return)

        for (itemIndex in 0 until itemCount) {
            val view = recycler.getViewForPosition(itemIndex)
            addView(view)

            val viewWidth = pxFromDp(context, 90f)
            val viewHeight = pxFromDp(context, 90f)

            val left = (itemIndex * viewWidth) - horizontalOffset
            val right = left + viewWidth
            val top = computeYComponent((left + right) / 2, viewHeight)
            val bottom = top.first + viewHeight

            val alpha = top.second
            view.rotation = (alpha * (180 / PI)).toFloat() - 90f

            measureChildWithMargins(view ?: return, viewWidth.toInt(), viewHeight.toInt())
            layoutDecoratedWithMargins(
                view,
                left.toInt(),
                top.first.toInt(),
                right.toInt(),
                bottom.toInt()
            )
        }

        recycler.scrapList.toList().forEach {
            recycler.recycleView(it.itemView)
        }
    }

    private fun computeYComponent(viewCenterX: Float,
                                  h: Float): Pair<Int, Double> {
        val screenWidth = context.resources.displayMetrics.widthPixels
        val s = screenWidth.toDouble() / 2
        val radius = (h * h + s * s) / (h * 2)

        val xScreenFraction = viewCenterX.toDouble() / screenWidth.toDouble()
        val beta = acos(s / radius)

        val alpha = beta + (xScreenFraction * (Math.PI - (2 * beta)))
        val yComponent = radius - (radius * sin(alpha))

        return Pair(yComponent.toInt(), alpha)
    }

    private fun pxFromDp(context: Context, dp: Float): Float {
        return dp * context.resources.displayMetrics.density
    }
}

hi i tried the above layout manager, its not showing any things, its displaying as empty screen , will u please help me out on this