Load Data when reach at bottom

HomeFragment.kt

package com.rohitjakhar.blogx.ui.home

import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.AbsListView
import androidx.fragment.app.Fragment
import androidx.lifecycle.ViewModelProvider
import androidx.lifecycle.lifecycleScope
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.rohitjakhar.blogx.adapters.HomePostAdapter
import com.rohitjakhar.blogx.databinding.FragmentHomeBinding
import com.rohitjakhar.blogx.repository.remote.RemoteDataSource
import kotlinx.coroutines.*

class HomeFragment : Fragment() {

    private var _binding: FragmentHomeBinding? = null
    private val binding get() = _binding!!
    private lateinit var homeViewModel: HomeViewModel
    private var pageNo = 1
    private val mAdapter by lazy { HomePostAdapter() }
    private val linearLayoutManager by lazy { LinearLayoutManager(requireContext()) }
    private var isLoading = true
    private var userScroll = true

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        homeViewModel =
            ViewModelProvider(this).get(HomeViewModel::class.java)
        _binding = FragmentHomeBinding.inflate(inflater, container, false)

        binding.rvPost.apply {
            layoutManager = linearLayoutManager
            adapter = mAdapter
            setHasFixedSize(true)
            addOnScrollListener(object : RecyclerView.OnScrollListener() {

                override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
                    super.onScrollStateChanged(recyclerView, newState)

                    if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
                        userScroll = true
                    }
                }

                override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                    super.onScrolled(recyclerView, dx, dy)

                    val totalItem = linearLayoutManager.itemCount
                    val visibleItemCount = linearLayoutManager.childCount
                    val pastVisibleItems = linearLayoutManager.findFirstVisibleItemPosition()
                    val lastItem = linearLayoutManager.findLastCompletelyVisibleItemPosition()

                    Log.d("testRecyc", "Loding: $isLoading")
                    if (userScroll && (visibleItemCount + pastVisibleItems) == totalItem && dy > 0) {
                        userScroll = false
                        updateRecyclerView()
                    }
                }
            })
        }

        loadData(pageNo)

        return binding.root
    }

    private fun updateRecyclerView() {

        binding.progressBar.visibility = View.VISIBLE
        lifecycleScope.launch {
            delay(2000)
            isLoading = false
            pageNo++
            binding.progressBar.visibility = View.VISIBLE
            loadData(pageNo)
            userScroll = false
        }

        Log.d("testRecyc", "page: $pageNo")
    }

    private fun loadData(pageNo: Int) {
       val dataCall = RemoteDataSource()
        val getPost = runBlocking {
            withContext(Dispatchers.IO) {
                dataCall.getPost(
                    pageNo
                )
            }
        }
        if (getPost.isSuccessful) {
            val data = getPost.body()
            Log.d("postData", data.toString())
            mAdapter.setDate(data!!)
            mAdapter.notifyDataSetChanged()
            binding.progressBar.visibility = View.GONE
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        _binding = null
    }
}