E/RecyclerView: No adapter attached; skipping layout. Recyclerlist can't be viewed. Output get crashed - android-layout

Question

Its saying adapter is not attached. I am new to kotlin. So I don't know where does it go wrong.
RestaurantModel.kt
package com.example.foodtogo.model
import android.os.Parcel
import android.os.Parcelable
import java.io.Serializable
class RestaurantModel(val name:String?, val address:String?, val delivery_charge: Int, val image: String?, val open: String?,
var menus: List<Menus?>?): Serializable {}
class Menus(val name:String?, val price: Float, val url:String?, var totalInCart: Int):Serializable {}
RestaurantMainActivity.kt
import android.content.Context
import android.os.Bundle
import android.util.Log
import android.view.Menu
import android.view.MenuItem
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.foodtogo.databinding.ActivityRestaurantMainBinding
import com.example.foodtogo.model.RestaurantModel
import com.example.foodtogo.view.RestaurantListAdapter
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.database.*
import com.google.firebase.database.ktx.database
import com.google.firebase.ktx.Firebase
import android.content.Intent as Intent
class RestaurantMainActivity : AppCompatActivity(),RestaurantListAdapter.ValueEventListener {
private lateinit var binding: ActivityRestaurantMainBinding
private lateinit var firebaseAuth: FirebaseAuth
private lateinit var database: FirebaseDatabase
private lateinit var reference: DatabaseReference
private lateinit var restaurantList: ArrayList<RestaurantModel>
//var adapter: RestaurantListAdapter?=null
//private lateinit var restaurantList: MutableList<RestaurantModel?>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityRestaurantMainBinding.inflate(layoutInflater)
setContentView(binding.root)
firebaseAuth = FirebaseAuth.getInstance()
database = FirebaseDatabase.getInstance()
reference = database.reference
Log.e("AKSA", "TEST1")
binding.recyclerViewRestaurant.layoutManager = LinearLayoutManager(this)
Log.e("AKSA", "TEST")
restaurantList = arrayListOf<RestaurantModel>()
getRestaurantData()
Log.e("AKSA", "TEST3")
}
override fun Context.onItemClick(restaurantModel: RestaurantModel) {
val intent = Intent(applicationContext,RestaurantMenuActivity::class.java)
intent.putExtra("RestaurantModel", restaurantModel)
startActivity(intent)
Log.d("AKSA", "MESSAGE")
}
private fun getRestaurantData(){
val db = Firebase.database.reference
val restaurantModelRef = db.child("RestaurantModel")
restaurantModelRef.get().addOnCompleteListener {
if (it.isSuccessful) {
val snapshot = it.result
for (restaurant in snapshot.children) {
Log.d("AKSA", "T4")
val restaurantModel = restaurant.child("RestaurantModel").getValue(RestaurantModel::class.java)
Log.d("AKSA", restaurantModel?.address.toString())
restaurantList.add(restaurantModel!!)
}
val adapter = RestaurantListAdapter(restaurantList, getApplicationContext())
binding.recyclerViewRestaurant.adapter = adapter
adapter.notifyDataSetChanged()
} } }
override fun onCreateOptionsMenu(menu: Menu?): Boolean {
menuInflater.inflate(R.menu.menubar, menu)
return super.onCreateOptionsMenu(menu)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
when (item.itemId) {
R.id.home_menu -> {
val intent = Intent(this, ViewOrderActivity::class.java)
startActivity(intent)
}
R.id.signout_menu -> {
firebaseAuth.signOut()
val intent = Intent(this, LOGIN::class.java)
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
startActivity(intent)
finish()
}
}
return super.onOptionsItemSelected(item)
}
}
activity_restaurant_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
tools:context=".RestaurantMainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerViewRestaurant"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="3dp"
android:layout_marginEnd="1dp"
android:layout_marginBottom="4dp"
android:clipToPadding="false"
android:paddingBottom="2dp"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0"
tools:listitem="#layout/recycler_restaurantlist"
tools:visibility="visible" />
</androidx.constraintlayout.widget.ConstraintLayout>
ResaturantListAdapter.kt
import android.content.Context
import android.content.Intent
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.example.foodtogo.R
import com.example.foodtogo.RestaurantMenuActivity
import com.example.foodtogo.model.RestaurantModel
class RestaurantListAdapter(val restaurantList: ArrayList<RestaurantModel>, val clickListener: Context):
RecyclerView.Adapter<RestaurantListAdapter.MyViewHolder>() {
//private lateinit var database: FirebaseDatabase
//private lateinit var reference:DatabaseReference
override fun onCreateViewHolder(
parent: ViewGroup,
viewType: Int
): RestaurantListAdapter.MyViewHolder {
val view: View = LayoutInflater.from(parent.context).inflate(R.layout.recycler_restaurantlist,parent,false)
return MyViewHolder(view)
}
override fun onBindViewHolder(holder: RestaurantListAdapter.MyViewHolder, position: Int) {
holder.bind(restaurantList.get(position))
holder.itemView.setOnClickListener{
clickListener.onItemClick(restaurantList.get(position))
}
}
override fun getItemCount(): Int {
return restaurantList.size
}
inner class MyViewHolder(view: View):RecyclerView.ViewHolder(view){
val thumbImage: ImageView =view.findViewById(R.id.thumbImage)
val restaurantName: TextView =view.findViewById(R.id.restaurantName)
val restaurantAddress:TextView=view.findViewById(R.id.restaurantAddress)
val restaurantHours:TextView=view.findViewById(R.id.restaurantHours)
fun bind(restaurantModel: RestaurantModel?){
restaurantName.text=restaurantModel?.name
restaurantAddress.text="Address: "+restaurantModel?.address
restaurantHours.text="Open: "+restaurantModel?.open
Glide.with(this.thumbImage).load(restaurantModel?.image).centerCrop().placeholder(R.drawable.ic_launcher_background).into(thumbImage)
}
}
interface ValueEventListener {
// fun onItemClick(restaurantModel: RestaurantModel)
fun Context.onItemClick(restaurantModel: RestaurantModel)
}
}
private fun Context.onItemClick(restaurantModel: RestaurantModel) {
val intent = Intent(applicationContext, RestaurantMenuActivity::class.java)
intent.putExtra("RestaurantModel", restaurantModel)
startActivity(intent)
}
recycler_restaurantlist.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:id="#+id/cardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:paddingTop="5dp"
app:cardCornerRadius="7dp"
app:cardElevation="7dp"
app:cardUseCompatPadding="true"
app:contentPadding="5dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ImageView
android:id="#+id/thumbImage"
android:layout_width="110dp"
android:layout_height="110dp"
android:layout_gravity="start"
android:layout_margin="10dp"
tools:srcCompat="#drawable/ic_launcher_background" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginStart="125dp"
android:orientation="vertical">
<TextView
android:id="#+id/restaurantName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="10dp"
android:layout_marginEnd="10dp"
android:textColor="#color/yellow"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="#+id/restaurantAddress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:textColor="#color/black"
android:textSize="14sp"
android:textStyle="normal" />
<TextView
android:id="#+id/restaurantHours"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
android:textColor="#color/black"
android:textSize="12sp"
android:textStyle="bold" />
</LinearLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
While I was using json file it worked. But when I tried to retrieve data from realtime database firebase, it got stuck. I don't know, where does it go wrong. And also I can't retrieve the data from realtime database too.