Kotlin :Can't get the price of the item of RecyclerView on Fragment - kotlin

Question

I am attempting to make a recyclerView on Fragment ,
The idea is to get the price of the Item ,when the item been selected ,
and multiply by the select amount from the popup menu also.
Like below :
The recyclerView model item : item_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="120dp"
android:gravity="center"
android:id="#+id/cardView"
android:layout_margin="10dp"
android:background="#40E0D0"
android:layout_height="200dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Price:"
android:textColor="#color/black"
android:textSize="18sp"/>
<TextView
android:id="#+id/price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:text="100"
android:textColor="#color/black"
android:textSize="18sp"/>
</LinearLayout>
The model of the item : Product.kt :
package com.gearsrun.popmenuapplication
data class Product(var price : String)
private selectFuntion(itemPrice:Int){
}
ProductAdapter.kt
package com.gearsrun.popmenuapplication
import android.graphics.Color
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import kotlinx.android.synthetic.main.item_layout.view.*
class ProductAdapter(private val productList:List<Product>,private val itemClick:(Int) -> Unit):RecyclerView.Adapter<ProductAdapter.ProductViewHolder>() {
private var selectedItemPosition :Int = 0
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ProductViewHolder {
val itemView = LayoutInflater.from(parent.context).inflate(R.layout.item_layout,parent,false)
return ProductViewHolder(itemView,itemClick)
}
override fun onBindViewHolder(holder: ProductViewHolder, position: Int) {
val currentItem = productList[position]
holder.price.text = currentItem.price.toString()
holder.itemView.setOnClickListener {
selectedItemPosition = position
notifyDataSetChanged()
}
if(selectedItemPosition == position){
holder.itemView.cardView.setBackgroundColor(Color.parseColor("#FAFAD2"))
}else{
holder.itemView.cardView.setBackgroundColor(Color.parseColor("#FFFFFF"))
}
}
override fun getItemCount() = productList.size
class ProductViewHolder(itemView: View, itemClick: (Int) -> Unit) :
RecyclerView.ViewHolder(itemView) {
val price : TextView = itemView.price
init {
itemView.setOnClickListener {
itemClick(price.text.toString().toInt()) //sortOf if you need String, change that on String in every declaration
}
}
}
}
Fragment.kt
package com.gearsrun.popmenuapplication.fragment
import android.os.Bundle
import android.util.Log
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.Menu
import android.view.View
import android.view.ViewGroup
import android.widget.PopupMenu
import androidx.recyclerview.widget.LinearLayoutManager
import com.gearsrun.popmenuapplication.Product
import com.gearsrun.popmenuapplication.ProductAdapter
import com.gearsrun.popmenuapplication.R
import kotlinx.android.synthetic.main.fragment_home.*
class HomeFragment : Fragment(R.layout.fragment_home) {
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
//init popup menu
val popupMenu = PopupMenu(
context,
selectedTv
)
//add menu items to popup menu
popupMenu.menu.add(Menu.NONE,0,0,"1")
popupMenu.menu.add(Menu.NONE,1,1,"2")
popupMenu.menu.add(Menu.NONE,2,2,"3")
popupMenu.menu.add(Menu.NONE,3,3,"4")
popupMenu.menu.add(Menu.NONE,4,4,"5")
//handle menu clicks
popupMenu.setOnMenuItemClickListener {menuItem ->
//get id of the item clicked
val id = menuItem.itemId
if(id==0){
selectedTv.text = "1"
}else if(id==1){
selectedTv.text = "2"
}else if(id==2){
selectedTv.text = "3"
}else if(id==3){
selectedTv.text = "4"
}else if(id==4){
selectedTv.text = "5"
}
true
}
//handle button click,show menu
selectedTv.setOnClickListener {
popupMenu.show()
}
//display recyclerview
val productList = generateProductList()
fun selectFuntion(itemPrice: Int){
Log.e("haha","You have click${itemPrice}")
}
var adapter = ProductAdapter(productList,::selectFuntion)
giftRecycleView.adapter = adapter
giftRecycleView.layoutManager = LinearLayoutManager(context,LinearLayoutManager.HORIZONTAL,false)
}
private fun generateProductList():List<Product> {
val list = ArrayList<Product>()
list.add(Product(1))
list.add(Product(2))
list.add(Product(3))
return list
}
}
Can anyone help me modify my code ?
I will need that the item's value can be catch once click ,and multiply by the select amount ,in order to get the total price .
Thank you so much in advance !!

Answer 1

ProductAdapter.kt
add this:
class ProductAdapter(
private val productList:List<Product>,
private val itemClick: (Int) -> Unit
): RecyclerView.Adapter<ProductAdapter.ProductViewHolder>() {
delete this:
interface onItemClickListener {
fun onItemClick(position: Int)
}
fun setOnItemClickListener(listener: onItemClickListener) {
mlistener = listener
}
replace this:
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ProductViewHolder {
val itemView = LayoutInflater.from(parent.context).inflate(R.layout.item_layout,parent,false)
return ProductViewHolder(itemView,itemClick)
}
replace this:
class ProductViewHolder(itemView: View, itemClick: (Int) -> Unit) :
RecyclerView.ViewHolder(itemView) {
val price : TextView = itemView.price
init {
itemView.setOnClickListener {
itemclick(price.text.toInt()) //sortOf if you need String, change that on String in every declaration
}
}
}
replace in fragment:
var adapter = ProductAdapter(productList, ::yourFunction)
giftRecycleView.adapter = adapter
add in fragment or ViewModel:
private yourFunction(itemPrice: Int) {
// do something with price
}
if you need to edit that price just make return type:
(Int) -> Int sort of :D
and in adapter
price.text = itemclick(price.text.toInt()).toString()