Android Image Slider using ViewPager in Kotlin

package com.gtappdevelopers.kotlingfgproject

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.RelativeLayout
import androidx.viewpager.widget.PagerAdapter
import java.util.*

class ViewPagerAdapter(val context: Context, val imageList: List<Int>) : PagerAdapter() {
    // on below line we are creating a method 
    // as get count to return the size of the list.
    override fun getCount(): Int {
        return imageList.size
    }

    // on below line we are returning the object
    override fun isViewFromObject(view: View, `object`: Any): Boolean {
        return view === `object` as RelativeLayout
    }

    // on below line we are initializing 
    // our item and inflating our layout file
    override fun instantiateItem(container: ViewGroup, position: Int): Any {
        // on below line we are initializing 
        // our layout inflater.
        val mLayoutInflater =
            context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
        
        // on below line we are inflating our custom 
        // layout file which we have created.
        val itemView: View = mLayoutInflater.inflate(R.layout.image_slider_item, container, false)
        
        // on below line we are initializing 
        // our image view with the id.
        val imageView: ImageView = itemView.findViewById<View>(R.id.idIVImage) as ImageView
        
        // on below line we are setting 
        // image resource for image view.
        imageView.setImageResource(imageList.get(position))
        
        // on the below line we are adding this
        // item view to the container.
        Objects.requireNonNull(container).addView(itemView)
        
        // on below line we are simply 
        // returning our item view.
        return itemView
    }

    // on below line we are creating a destroy item method.
    override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
        // on below line we are removing view
        container.removeView(`object` as RelativeLayout)
    }
}

package com.gtappdevelopers.kotlingfgproject

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.viewpager.widget.ViewPager

class MainActivity : AppCompatActivity() {

    // on below line we are creating variable for view pager, 
    // viewpager adapter and the image list.
    lateinit var viewPager: ViewPager
    lateinit var viewPagerAdapter: ViewPagerAdapter
    lateinit var imageList: List<Int>

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        
        // initializing variables 
        // of below line with their id.
        viewPager = findViewById(R.id.idViewPager)
        
        // on below line we are initializing 
        // our image list and adding data to it.
        imageList = ArrayList<Int>()
        imageList = imageList + R.drawable.android
        imageList = imageList + R.drawable.c
        imageList = imageList + R.drawable.java
        imageList = imageList + R.drawable.js
        imageList = imageList + R.drawable.python
        
        // on below line we are initializing our view 
        // pager adapter and adding image list to it.
        viewPagerAdapter = ViewPagerAdapter(this@MainActivity, imageList)
        
        // on below line we are setting 
        // adapter to our view pager.
        viewPager.adapter = viewPagerAdapter
    }
}