Kotlin E/RecyclerView: No adapter attached; skipping layout (Adapter doesnt work) - android-studio

Question

I am using RecyclerView in my app. But I'm getting this error in the Logcat. Here is my Codes;
My Fragment
package com.ahmetkaan.kediy.Fragments
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.appcompat.widget.SearchView
import androidx.fragment.app.Fragment
import androidx.navigation.Navigation
import androidx.recyclerview.widget.StaggeredGridLayoutManager
import com.ahmetkaan.kediy.R
import com.ahmetkaan.kediy.adapter.NotesAdapter
import com.ahmetkaan.kediy.database.NotesDatabase
import com.ahmetkaan.kediy.databinding.FragmentHomeBinding
import com.ahmetkaan.kediy.entities.Notlar
import kotlinx.coroutines.launch
import java.util.*
import kotlin.collections.ArrayList
class Home : BaseFragment() {
lateinit var binding : FragmentHomeBinding
var arrNotes = ArrayList<Notlar>()
var notesAdapter: NotesAdapter = NotesAdapter()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
}
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentHomeBinding.inflate(inflater, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding.recyclerView.setHasFixedSize(true)
binding.recyclerView.layoutManager = StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL)
launch {
context?.let {
val notes = NotesDatabase.getDatabase(it).noteDao().getAllNotes()
notesAdapter.setData(notes)
arrNotes = notes as ArrayList<Notlar>
binding.recyclerView.adapter = notesAdapter
}
}
binding.searchView.setOnQueryTextListener( object : SearchView.OnQueryTextListener{
override fun onQueryTextSubmit(p0: String?): Boolean {
return true
}
override fun onQueryTextChange(p0: String?): Boolean {
var tempArr = ArrayList<Notlar>()
for (arr in arrNotes){
if (arr.not!!.toLowerCase(Locale.getDefault()).contains(p0.toString())){
tempArr.add(arr)
}
}
notesAdapter.setData(tempArr)
notesAdapter.notifyDataSetChanged()
return true
}
})
notesAdapter.setOnClickListener(onClicked)
binding.notEkle.setOnClickListener {
val action = HomeDirections.actionHome2ToNotOlustur()
Navigation.findNavController(requireActivity(), R.id.fragmentContainerView).navigate(action)
}
binding.calendar.setOnClickListener {
val action = HomeDirections.actionHome2ToCalendar2()
Navigation.findNavController(requireActivity(), R.id.fragmentContainerView).navigate(action)
}
}
private val onClicked = object :NotesAdapter.OnItemClickListener {
override fun onClicked(notesId: Int) {
val fragment: Fragment
val bundle = Bundle()
bundle.putInt("noteId", notesId)
fragment = NotOlustur.newInstance()
fragment.arguments = bundle
val action = HomeDirections.actionHome2ToNotOlustur()
Navigation.findNavController(requireActivity(), R.id.fragmentContainerView)
.navigate(action)
}
}
}
My Adapter
package com.ahmetkaan.kediy.adapter
import android.graphics.BitmapFactory
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.cardview.widget.CardView
import androidx.core.graphics.drawable.toDrawable
import androidx.recyclerview.widget.RecyclerView
import com.ahmetkaan.kediy.R
import com.ahmetkaan.kediy.entities.Notlar
import kotlin.collections.ArrayList
class NotesAdapter() :
RecyclerView.Adapter<NotesAdapter.NotesViewHolder>() {
var listener:OnItemClickListener? = null
var arrList = ArrayList<Notlar>()
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): NotesViewHolder {
return NotesViewHolder(
LayoutInflater.from(parent.context).inflate(R.layout.item_notlar,parent,false)
)
}
override fun getItemCount(): Int {
return arrList.size
}
fun setData(arrNotesList: List<Notlar>){
arrList = arrNotesList as ArrayList<Notlar>
}
fun setOnClickListener(listener1: OnItemClickListener){
listener = listener1
}
override fun onBindViewHolder(holder: NotesViewHolder, position: Int) {
holder.itemView.findViewById<TextView>(R.id.theNotC).text = arrList[position].not
holder.itemView.findViewById<TextView>(R.id.dateTimeC).text = arrList[position].dateTime
if (arrList[position].impPathBackground != null){
holder.itemView.findViewById<ImageView>(R.id.backgroundC).setImageBitmap(BitmapFactory.decodeFile(arrList[position].impPathBackground))
} else {
holder.itemView.findViewById<ImageView>(R.id.backgroundC).setImageDrawable(R.drawable.ronin.toDrawable())
}
if (arrList[position].impPathBackground != null){
holder.itemView.findViewById<ImageView>(R.id.backgroundC).setImageBitmap(BitmapFactory.decodeFile(arrList[position].impPathLogo))
} else {
holder.itemView.findViewById<ImageView>(R.id.backgroundC).setImageDrawable(R.drawable.logo1.toDrawable())
}
holder.itemView.findViewById<CardView>(R.id.cardView).setOnClickListener {
listener!!.onClicked(arrList[position].id!!)
}
}
class NotesViewHolder(view:View) : RecyclerView.ViewHolder(view){
}
interface OnItemClickListener{
fun onClicked(noteId:Int)
}
}
I searched a lot on the internet but I didn't understand much because they are all in java language. It didn't work even though I tried what I understood. Unlike others, I used CoroutineScope(launch) I think it was because of it, but I'm not sure. What should i do?

Answer 1

Setting the adapter should be in the main thread. But you wrapped it in launch.
binding.recyclerView.adapter = notesAdapter