I have overlapping cards and on swiping left I want the top card which is swiped to back to bottom of the all cards, behind the current bottom card. This swiped card should reappear again after the all the cards above it are swiped. Below is the image of my overlapping cards. UI Image

So, initially my activity code is as follows MainActivity.kt

import android.graphics.Canvas
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.RecyclerView

class MainActivity : AppCompatActivity() {

    private lateinit var recyclerView: RecyclerView
    private lateinit var adapter:ToLearnAdapter
    private val items = mutableListOf("Card 1", "Card 2", "Card 3", "Card 4", "Card 5")

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        recyclerView = findViewById(R.id.recyclerView)
        adapter = ToLearnAdapter(items)
        recyclerView.adapter = adapter
        recyclerView.layoutManager = OverlappingLayoutManager(this)

        val itemTouchHelper = ItemTouchHelper(object : ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
            override fun onMove(
                recyclerView: RecyclerView,
                viewHolder: RecyclerView.ViewHolder,
                target: RecyclerView.ViewHolder
            ): Boolean {
                return false
            }

            override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
                val position = viewHolder.adapterPosition
                adapter.moveToBottom(position)
            }

            override fun onChildDraw(
                c: Canvas,
                recyclerView: RecyclerView,
                viewHolder: RecyclerView.ViewHolder,
                dX: Float,
                dY: Float,
                actionState: Int,
                isCurrentlyActive: Boolean
            ) {
                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
                viewHolder.itemView.alpha = 1 - Math.abs(dX) / recyclerView.width
                viewHolder.itemView.translationX = dX
            }
        })
        itemTouchHelper.attachToRecyclerView(recyclerView)
    }
}

Below is my Adapter class ToLearnAdapter.kt
package com.example.overlapping

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView

class ToLearnAdapter(private val items:MutableList<String>):
      RecyclerView.Adapter<ToLearnAdapter.ToLearnViewHolder>(){

    class ToLearnViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val textView: TextView = view.findViewById(R.id.textView)
    }
    override fun onCreateViewHolder(
        parent: ViewGroup,
        viewType: Int
    ): ToLearnAdapter.ToLearnViewHolder {
        val view = LayoutInflater.from(parent.context)
            .inflate(R.layout.card_item,parent,false)
        return ToLearnViewHolder(view)
    }

    override fun onBindViewHolder(holder: ToLearnAdapter.ToLearnViewHolder, position: Int) {
        holder.textView.text = items[position]
    }

    override fun getItemCount(): Int {
        return items.size
    }

    fun moveToBottom(position: Int) {
        if (position < 0 || position >= items.size) return
        val item = items.removeAt(position)
        items.add(item)
        notifyItemMoved(position, items.size - 1)
        notifyItemChanged(items.size - 1)
    }

}

Below is my Custom LayoutManager caalled OverlappingLayoutManager.kt

import android.content.Context
import android.view.View
import android.view.ViewGroup
import android.view.animation.Interpolator
import android.view.animation.LinearInterpolator
import androidx.annotation.Dimension
import androidx.core.view.ViewCompat
import androidx.recyclerview.widget.RecyclerView


class OverlappingLayoutManager(context: Context) : RecyclerView.LayoutManager() {

    private val horizontalOverlap: Float =
        context.resources.getDimension(R.dimen.card_horizontal_overlap)
    private val verticalOverlap: Float =
        context.resources.getDimension(R.dimen.card_vertical_overlap)
    @get:Dimension
    private val tiltAngle: Float =
        context.resources.getDimension(R.dimen.card_tilt_angle)
    private var interpolator: Interpolator = LinearInterpolator() // Use an interpolator for smooth tilting

    override fun generateDefaultLayoutParams(): RecyclerView.LayoutParams {
        return RecyclerView.LayoutParams(
            ViewGroup.LayoutParams.WRAP_CONTENT,
            ViewGroup.LayoutParams.WRAP_CONTENT
        )
    }

    override fun onLayoutChildren(recycler: RecyclerView.Recycler, state: RecyclerView.State?) {
        if (itemCount == 0) {
            removeAndRecycleAllViews(recycler)
            return
        }

        detachAndScrapAttachedViews(recycler)

        val parentWidth = width
        val parentHeight = height

        var zIndex = 0

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

            // Set z-index for the view
            val elevation = zIndex.toFloat()
            ViewCompat.setElevation(view, elevation)
            zIndex++

            measureChildWithMargins(view, 0, 0)
            val width = getDecoratedMeasuredWidth(view)
            val height = getDecoratedMeasuredHeight(view)

            val centerX = parentWidth / 2f
            val centerY = parentHeight / 2f

            val itemOffset = calculateItemOffset(position)
            val newCenterX = centerX + itemOffset * horizontalOverlap

            val left = (newCenterX - (width / 2)).toInt()
            val top = (centerY - (height / 2)).toInt()
            val right = (newCenterX + (width / 2)).toInt()
            val bottom = (centerY + (height / 2)).toInt()

            layoutDecoratedWithMargins(view, left, top, right, bottom)

            applyTilt(view, position)
        }
    }

    private fun applyTilt(view: View, position: Int) {
        val tilt = calculateTilt(position) * tiltAngle
        view.pivotX = (view.width / 2).toFloat()
        view.pivotY = (view.height / 2).toFloat()
        view.rotation = tilt
    }

    protected open fun calculateItemOffset(position: Int): Float {
        return if (position % 2 == 0) -1f else 1f
    }

    protected open fun calculateTilt(position: Int): Float {
        return if (position % 2 == 0) -1f else 1f
    }

    fun setInterpolator(interpolator: Interpolator) {
        this.interpolator = interpolator
    }
}

My layout file activity_main.xml is as follows

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="40dp"
        tools:listitem="@layout/card_item" />
</RelativeLayout>

and layout file for adapter class is card_item.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="300dp"
    android:layout_margin="18dp"
    card_view:cardCornerRadius="8dp"
    card_view:cardElevation="4dp">

    <TextView
        android:layout_gravity="center"
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="24sp"
        android:text="Card Text" />

</androidx.cardview.widget.CardView>

So, I tried update the data by creating a separate moveToBottom function in adapter class but still when i try to swipe the front card, it doesn’t go back to the bottom of the cards nor it goes away, it just moves for a moment and comes back to the same position

I have created a separate function in adapater class which has a logic yo move the card to the bottom but the card just doesn’t go to the bottom, when i swipe LEFT, it swipes and comes back to original top position again