The problem of the applicaion keep stopping [duplicate]

Question

I have faced the problem of my application always show keep stopping. I try to see the terminal and it show me the problem is not been initialized. However, I have found many ways but still cannot show it. Can somebody help me? Thank for your help

Below are my original code which problem out :

package com.example.assignment_mad

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.viewpager2.widget.ViewPager2
import com.example.assignment_mad.databinding.ActivityMainBinding
import com.google.android.material.imageview.ShapeableImageView
import com.google.android.material.tabs.TabLayout
import kotlinx.android.synthetic.*
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.fragment_notification_.*


class Notification_Fragment : Fragment( ) {

    private lateinit var newRecyclerView: RecyclerView
    private lateinit var newArrayList: ArrayList<Company>
    private lateinit var tempArrayList: ArrayList<Company>
    lateinit var imageId:Array<Int>
    lateinit var heading:Array<String>
    lateinit var news:Array<String>



    private var layoutManager: RecyclerView.LayoutManager? = null
    private var adapter: RecyclerView.Adapter<NotificationAdapter.MyViewHolder>? = null

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {


        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_notification_, container, false)


    }

    override fun onViewCreated(itemView: View, savedInstanceState: Bundle?) {

        imageId= arrayOf(
            R.drawable.company_logo_1,
            R.drawable.company_logo_2,
            R.drawable.company_logo_3,
            R.drawable.company_logo_4,
            R.drawable.company_logo_5,
            R.drawable.company_logo_6,
            R.drawable.company_logo_7,
            R.drawable.company_logo_8,
            R.drawable.company_logo_9,
            R.drawable.company_logo_10
        )

        heading= arrayOf(
            "Candidate Biden Called Saudi Arable a Pareft eaft.",
            "The definitive text on the healing powers of the mind/body connection.",
            "This is the definitive book on mindfulness from the beloved Zen master.",
            "A timeless classic in personal development.",
            "The definitive text on the healing powers of the mind/body connection.",
            "The definitive text on the healing powers of the mind/body connection.",
            "The definitive text on the healing powers of the mind/body connection.",
            "The definitive text on the healing powers of the mind/body connection.",
            "The definitive text on the healing powers of the mind/body connection.",
            "The definitive text on the healing powers of the mind/body connection."
        )

        news= arrayOf(
            getString(R.string.news_a),
            getString(R.string.news_b),
            getString(R.string.news_c),
            getString(R.string.news_d),
            getString(R.string.news_e),
            getString(R.string.news_f),
            getString(R.string.news_g),
            getString(R.string.news_h),
            getString(R.string.news_i),
            getString(R.string.news_j)
        )


        newArrayList= arrayListOf<Company>()
        tempArrayList= arrayListOf<Company>() //it show here get error
        getUserdata()

        super.onViewCreated(itemView, savedInstanceState)

        newRecyclerView.apply {
            layoutManager=LinearLayoutManager(activity)
            newRecyclerView=findViewById(R.id.recyclerView)
            newRecyclerView.setHasFixedSize(true)

        }

        recyclerView.apply {
            // set a LinearLayoutManager to handle Android
            // RecyclerView behavior
            layoutManager = LinearLayoutManager(activity)
            // set the custom adapter to the RecyclerView
            adapter = NotificationAdapter(newArrayList)
        }


    }


    private fun getUserdata() {
        for (i in imageId.indices){
            val company=Company(imageId[i],heading[i])
            newArrayList.add(company)
        }


        newRecyclerView.adapter=NotificationAdapter(newArrayList) //it show here get error
  
    }


}

Below are my problem showing out :

kotlin.UninitializedPropertyAccessException: lateinit property newRecyclerView has not been initialized
        at com.example.assignment_mad.Notification_Fragment.getUserdata(Notification_Fragment.kt:122)
        at com.example.assignment_mad.Notification_Fragment.onViewCreated(Notification_Fragment.kt:89)

Below are my Notification Adapter :

package com.example.assignment_mad

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.imageview.ShapeableImageView

class NotificationAdapter(private val companyList:ArrayList<Company>): RecyclerView.Adapter<NotificationAdapter.MyViewHolder>() {

    private lateinit var mListener:onItemClickListener

    interface onItemClickListener{
        fun onItemClick(position: Int)
    }

    fun setOnItemClickListener(listener: onItemClickListener){
        mListener=listener
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val itemView=
            LayoutInflater.from(parent.context).inflate(R.layout.fragment_notification_,parent,false)
        return MyViewHolder(itemView,mListener)
    }

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        val currentItem=companyList[position]
        holder.titleImage.setImageResource(currentItem.titleImage)
        holder.tvHeading.text=currentItem.heading
    }

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

    //to insert the post detail
    class MyViewHolder(itemView: View, listener: onItemClickListener): RecyclerView.ViewHolder(itemView){

        val titleImage: ShapeableImageView =itemView.findViewById(R.id.title_image)
        val tvHeading: TextView =itemView.findViewById(R.id.tvHeading)

        init {
            itemView.setOnClickListener{
                listener.onItemClick(adapterPosition)
            }
        }
    }

}

Answer 1

Try to findViewById before apply

     override fun onCreateView(
            inflater: LayoutInflater, container: ViewGroup?,
            savedInstanceState: Bundle?
        ): View? {
        var views = inflater.inflate(R.layout.fragment_notification_, container, false)
        newRecyclerView=views.findViewById(R.id.recyclerView)
        
        return views 
    }

...

     newRecyclerView.apply {
         layoutManager=LinearLayoutManager(activity)
         newRecyclerView.setHasFixedSize(true)
            }