Я получаю продукт из облака и отображаю его во фрагменте корзины, но он не отображается. ⇐ Android

[Anonymous]

Я создаю приложение для заказа еды, в котором товар, добавленный в корзину из меню, хранится в облаке, а затем извлекается фрагментом корзины, но код кажется нормальным, но товар не отображается во фрагменте корзины. При запуске приложения я делюсь фрагментом корзины, адаптером корзины, элементом корзины и классом данных элемента меню. Любая помощь будет оценена по достоинству. Я следую руководству.
Я перекрестно проверяю имя в Firebase, элементы добавляются в каталог «CartItems».
Класс фрагмента корзины:
package com.example.wavesoffood.Fragment

import android.content.Intent
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.wavesoffood.Model.CartItems
import com.example.wavesoffood.PayOutActivity
import com.example.wavesoffood.R
import com.example.wavesoffood.adapter.CartAdapter
import com.example.wavesoffood.databinding.CartItemBinding
import com.example.wavesoffood.databinding.FragmentCartBinding
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.database.DataSnapshot
import com.google.firebase.database.DatabaseError
import com.google.firebase.database.DatabaseReference
import com.google.firebase.database.FirebaseDatabase
import com.google.firebase.database.ValueEventListener

class CartFragment : Fragment() {
private lateinit var binding: FragmentCartBinding
private lateinit var auth: FirebaseAuth
private lateinit var database: FirebaseDatabase
private lateinit var foodNames: MutableList
private lateinit var foodPrices: MutableList
private lateinit var foodDescriptions: MutableList
private lateinit var foodImageUrl: MutableList
private lateinit var foodIngredients: MutableList
private lateinit var quantity: MutableList
private lateinit var cartAdapter: CartAdapter
private lateinit var userId: String

override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)

}

override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentCartBinding.inflate(inflater, container, false)
auth = FirebaseAuth.getInstance()
retrieveCartItems()
binding.proccedButton.setOnClickListener {
val intent = Intent(requireContext(), PayOutActivity::class.java)
startActivity(intent)
}
return binding.root
}

private fun retrieveCartItems() {
// database reference to the FireBase
database = FirebaseDatabase.getInstance()
userId = auth.currentUser?.uid ?:""
val foodReference: DatabaseReference =
database.reference.child("user").child(userId).child("CartItems")
//list to Store cart items
foodNames = mutableListOf()
foodPrices = mutableListOf()
foodDescriptions = mutableListOf()
foodImageUrl = mutableListOf()
foodIngredients = mutableListOf()
quantity = mutableListOf()

// fetch data from the database
foodReference.addListenerForSingleValueEvent(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {

for (foodSnapshot in snapshot.children) {
//get the cartItems object from the child node
val cartItems = foodSnapshot.getValue(CartItems::class.java)

// add cart items details to the list

cartItems?.foodName?.let { foodNames.add(it) }
cartItems?.foodPrice?.let { foodPrices.add(it) }
cartItems?.foodDescription?.let { foodDescriptions.add(it) }
cartItems?.foodImage?.let { foodImageUrl.add(it) }
cartItems?.foodQuantity?.let { quantity.add(it) }
cartItems?.foodIngredient?.let { foodIngredients.add(it) }
}

// Set adapter after data is fetched
setAdapter()
}

override fun onCancelled(error: DatabaseError) {
Toast.makeText(context, "Data not fetch", Toast.LENGTH_SHORT).show()
}

})
}

private fun setAdapter() {
cartAdapter = CartAdapter(
requireContext(),
foodNames,
foodPrices,
foodDescriptions,
foodImageUrl,
quantity,
foodIngredients
)
binding.cartRecycleView.layoutManager =
LinearLayoutManager(requireContext(), LinearLayoutManager.VERTICAL, false)
binding.cartRecycleView.adapter = cartAdapter
}

companion object {
}
}

Класс адаптера корзины
package com.example.wavesoffood.adapter

import android.content.Context
import android.net.Uri
import android.util.Log
import android.view.LayoutInflater
import android.view.ViewGroup
import android.widget.Toast
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.example.wavesoffood.databinding.CartItemBinding
import com.example.wavesoffood.databinding.PopularItemBinding
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.database.DataSnapshot
import com.google.firebase.database.DatabaseError
import com.google.firebase.database.DatabaseReference
import com.google.firebase.database.FirebaseDatabase
import com.google.firebase.database.ValueEventListener

class CartAdapter(
private val context: Context,
private val cartItems: MutableList,
private val cartItemPrices: MutableList,
private var cartDescriptions: MutableList,
private var cartImages: MutableList,
private val cartQuantity: MutableList,
private val cartIngredients: MutableList
) : RecyclerView.Adapter() {

// get instance of FireBaseauth

private val auth = FirebaseAuth.getInstance()

init {
// instance Firebase
val database = FirebaseDatabase.getInstance()
val userId = auth.currentUser?.uid ?: ""
val cartItemNumber = cartItems.size

ItemQuantities = IntArray(cartItemNumber) { 1 }
cartItemReference = database.reference.child("user").child(userId).child("CartItems")
}

companion object {
private var ItemQuantities: IntArray = intArrayOf()
private lateinit var cartItemReference: DatabaseReference
}

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CartViewHolder {
val binding = CartItemBinding.inflate(LayoutInflater.from(parent.context), parent, false)
return CartViewHolder(binding)
}

override fun onBindViewHolder(holder: CartViewHolder, position: Int) {
holder.bind(position)
}

override fun getItemCount(): Int = cartItems.size

inner class CartViewHolder(private val binding: CartItemBinding) :
RecyclerView.ViewHolder(binding.root) {
fun bind(position: Int) {
binding.apply {
val quantity = ItemQuantities[position]
CartFoodName.text = cartItems[position]
CartPrice.text = cartItemPrices[position]
CartItemQuantity.text = quantity.toString()

//Using glide
val uriString = cartImages[position]
Log.d("image", "food Url: $uriString")
val uri = Uri.parse(uriString)
Glide.with(context).load(uri).into(CartImageFrag)

MinusButton.setOnClickListener {
decreaseQuantity(position)
}
PlusButton.setOnClickListener {
increaseQuantity(position)
}
DeleteButton.setOnClickListener {
val itemPosition = adapterPosition
if (itemPosition != RecyclerView.NO_POSITION) {
deleteItem(itemPosition)
}
}
}
}

private fun increaseQuantity(position: Int) {
if (ItemQuantities[position] < 10) {
ItemQuantities[position]++
binding.CartItemQuantity.text = ItemQuantities[position].toString()
}
}

private fun decreaseQuantity(position: Int) {
if (ItemQuantities[position] > 1) {
ItemQuantities[position]--
binding.CartItemQuantity.text = ItemQuantities[position].toString()
}
}

private fun deleteItem(position: Int) {
val positionRetrieve = position
getUniqueKeyAtPosition(positionRetrieve) { uniqueKey ->
if (uniqueKey != null) {
removeItem(position, uniqueKey)
}
}
}

private fun removeItem(position: Int, uniqueKey: String) {
if (uniqueKey != null) {
cartItemReference.child(uniqueKey).removeValue().addOnSuccessListener {
cartItems.removeAt(position)
cartImages.removeAt(position)
cartDescriptions.removeAt(position)
cartQuantity.removeAt(position)
cartItemPrices.removeAt(position)
cartIngredients.removeAt(position)
Toast.makeText(context, "Item Delete", Toast.LENGTH_SHORT).show()

// update itemQuantities
ItemQuantities =
ItemQuantities.filterIndexed { index, i -> index != position }.toIntArray()
notifyItemRemoved(position)
notifyItemRangeChanged(position, cartItems.size)
}.addOnFailureListener {
Toast.makeText(context, "Failed to Delete", Toast.LENGTH_SHORT).show()
}
}
}

private fun getUniqueKeyAtPosition(positionRetrieve: Int, onComplete: (String?) -> Unit) {
cartItemReference.addListenerForSingleValueEvent(object : ValueEventListener {
override fun onDataChange(snapshot: DataSnapshot) {
var uniqueKey: String? = null
// loop for snapshot children
snapshot.children.forEachIndexed { index, dataSnapshot ->
if (index == positionRetrieve) {
uniqueKey = dataSnapshot.key
return@forEachIndexed
}
}
onComplete(uniqueKey)
}

override fun onCancelled(error: DatabaseError) {
}

})
}
}
}

Класс данных CartItems
package com.example.wavesoffood.Model

data class CartItems(
val foodName: String?= null,
val foodPrice: String?= null,
val foodDescription: String? = null,
val foodImage: String? = null,
val foodQuantity: Int? = null,
val foodIngredient: String?= null,
)


Класс данных MenuItems
package com.example.wavesoffood.Model

data class MenuItem(
val foodName:String? = null,
val foodprice:String?=null,
val foodDescription:String?=null,
val foodImage:String?=null,
val foodQuantity: Int? = null,
val foodIngredient:String?=null
)


Подробнее здесь: https://stackoverflow.com/questions/786 ... -but-it-do