Divider for item's RecyclerView

DividerItemDecoration.kt

import android.graphics.Canvas
import android.graphics.Paint
import android.graphics.Rect
import android.view.View
import androidx.core.graphics.withTranslation
import androidx.core.view.children
import androidx.recyclerview.widget.RecyclerView

class DividerItemDecoration(
    private val strokeColor: Int,
    private val strokeWidth: Int,
    private val marginStart: Float = 0.0F,
    private val marginEnd: Float = marginStart,
    private val horizontalSpacing: Int = 0,
    private val verticalSpacing: Int = horizontalSpacing
) : RecyclerView.ItemDecoration() {

    private val dividerPaint = Paint().apply {
        color = strokeColor
        strokeWidth = [email protected]()
        flags = Paint.ANTI_ALIAS_FLAG
    }

    override fun getItemOffsets(
        outRect: Rect,
        view: View,
        parent: RecyclerView,
        state: RecyclerView.State
    ) {
        outRect.set(horizontalSpacing, verticalSpacing, horizontalSpacing, verticalSpacing)
    }

    override fun onDrawOver(canvas: Canvas, parent: RecyclerView, state: RecyclerView.State) {
        parent.children.forEach { child ->
            canvas.withTranslation(
                x = 0.0F,
                y = verticalSpacing.toFloat()
            ) {
                val lineTopY = child.top - strokeWidth/ 2f
                drawLine(
                    child.left + marginStart,
                    lineTopY,
                    child.right - marginEnd,
                    lineTopY,
                    dividerPaint
                )

                if (child.isLastItem(parent, state.itemCount)) {
                    val lineBottomY = child.bottom - strokeWidth/ 2f
                    drawLine(
                        child.left + marginStart,
                        lineBottomY,
                        child.right - marginEnd,
                        lineBottomY,
                        dividerPaint
                    )
                }
            }
        }
    }

    private fun View.isLastItem(parent: RecyclerView, itemCount: Int) =
        parent.getChildAdapterPosition(this) == itemCount - 1
}

//Usages
val divider = DividerItemDecoration(
            ContextCompat.getColor(context!!, R.color.colorGray),
            2.dpToPx,
            marginStart = 0f,
            marginEnd = 0f
        )
        
recyclerView.addItemDecoration(divider)