I'm trying to make a food application with android-Kotlin, and it contains: The problem is i tried many times to send data from "PopularDetailedActivity" to another activity onClick (Add To Cart Button) which contains my Cart or basket that i choose, but i can't access a solution.
PopularAdapter.kt that pass the data to PopularDetailedActivity.kt
class PopularAdapter(private var popItems: List<Popular>): RecyclerView.Adapter<PopularAdapter.MyViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
val popView = LayoutInflater.from(parent.context).inflate(R.layout.pop_items, parent, false)
return MyViewHolder(popView)
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
val newPop: Popular = popItems[position]
holder.foodName.text = newPop.foodName
holder.foodImg.setImageResource(newPop.foodImage)
holder.foodDollar.text = newPop.foodDollar
holder.foodPrice.text = newPop.foodPrice.toString()
holder.foodDetails.text = newPop.foodDetails
holder.myPop = newPop
}
override fun getItemCount(): Int {
return popItems.size
}
fun submitList(categories: List<Popular>){
popItems = categories
}
class MyViewHolder constructor(itemView: View, var myPop: Popular?= null):
RecyclerView.ViewHolder(itemView){
init {
itemView.addBtn.setOnClickListener {
val myIntent = Intent(itemView.context, PopularDetailed::class.java)
myIntent.putExtra("title", myPop!!.foodName)
myIntent.putExtra("price", myPop!!.foodPrice)
myIntent.putExtra("img", myPop!!.foodImage)
myIntent.putExtra("description", myPop!!.foodDetails)
itemView.context.startActivity(myIntent)
}
}
val foodName: TextView = itemView.popMainText
val foodImg: ShapeableImageView = itemView.popMainImg
val foodDollar: TextView = itemView.dollarTxt
val foodPrice: TextView = itemView.priceValue
val foodDetails: TextView = itemView.popDetail
}
}
PopularDetailedActivity.kt
class PopularDetailed : AppCompatActivity() {
private lateinit var cTitle: TextView
private lateinit var cImage: ShapeableImageView
private lateinit var cPrice: TextView
private lateinit var cDollar: TextView
private lateinit var cMinus: ImageView
private lateinit var cPlus: ImageView
private lateinit var cItemVal: TextView
private lateinit var cDescription: TextView
private lateinit var cAddBtn: Button
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_popular_details)
val bundle = intent.extras
val localTitle = bundle!!.getString("title")
val localPrice = bundle.getDouble("price")
val localImage = bundle.getInt("img")
val localDescription = bundle.getString("description")
initValues()
cTitle.text = localTitle
cPrice.text = localPrice.toString()
cImage.setImageResource(localImage)
cDescription.text = localDescription
incDecNum()
cAddBtn.setOnClickListener {
if (incDecValue.text.toString().toInt() > 0){
Toast.makeText(applicationContext, "Added To Your Cart", Toast.LENGTH_SHORT).show()
}
}
}
//Initiate Values
private fun initValues(){
cTitle = findViewById(R.id.pop_local_title)
cImage = findViewById(R.id.pop_local_img)
cPrice = findViewById(R.id.localPriceValue)
cDollar = findViewById(R.id.localDollarTxt)
cPlus = findViewById(R.id.incNum)
cItemVal = findViewById(R.id.incDecValue)
cMinus = findViewById(R.id.decNum)
cDescription = findViewById(R.id.pop_local_des)
cAddBtn = findViewById(R.id.local_add_btn)
}
//Increase or decrease items' number
private fun incDecNum(){
val priceValueInString = localPriceValue.toString()
var priceInDouble = priceValueInString.split("")[0].toDoubleOrNull()
val incDecValueInString = incDecValue.toString()
var numberOfItems = incDecValueInString.split(" ")[0].toIntOrNull()
numberOfItems = 0
decNum.setOnClickListener {
if (numberOfItems > 0){
numberOfItems -= 1
val newVal = numberOfItems.toString()
incDecValue.text = newVal
//Changing the price
/*if (priceInDouble != null) {
if (newVal > 0.toString()){
priceInDouble -= priceInDouble
localPriceValue.text = priceInDouble.toString()
}
}*/
} else{
//Toast.makeText(applicationContext, "", Toast.LENGTH_SHORT).show()
}
}
incNum.setOnClickListener {
numberOfItems = 1
val newVal = numberOfItems.toString()
incDecValue.text = newVal
//Changing the price
/*if (priceInDouble != null) {
if (newVal > 1.toString()){
priceInDouble = priceInDouble
localPriceValue.text = priceInDouble.toString()
}
}*/
}
}
}
MyCartBasketActivity.kt
class MyCartBasket : AppCompatActivity() {
private val myCartItems = ArrayList<MyCart>()
private val myCartAdapter = MyCartAdapter(myCartItems)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_my_cart_basket)
myCartDynamic.layoutManager = LinearLayoutManager(applicationContext, RecyclerView.VERTICAL, false)
myCartDynamic.adapter = myCartAdapter
}
//Adding Data
/*private fun addData(){
val cartItems = MyCartDynamicDataSource.createDynamicCartItems(myCartItems)
myCartAdapter.submitList(cartItems)
}*/
}
MyCartAdapter.kt for the result activity at MyCartBasketActivity.kt
class MyCartAdapter(private var cartItems: List<MyCart>):
RecyclerView.Adapter<MyCartAdapter.MyViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
val cartView = LayoutInflater.from(parent.context).inflate(R.layout.my_cart_items, parent, false)
return MyViewHolder(cartView)
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
val newCart = cartItems[position]
holder.cartedImg.setImageResource(newCart.cartedImg)
holder.cartedTitle.text = newCart.cartedTitle
holder.cartedItemNum.text = newCart.cartedItemNum
holder.cartedLPriceValue.text = newCart.cartedLPriceValue
holder.cartedIPriceValue.text = newCart.cartedIPriceValue
holder.cartedPlusItem.text = newCart.cartedPlusItem
holder.cartedMinusItem.text = newCart.cartedMinusItem
}
fun submitList(cartNewItems: List<MyCart>){
cartItems = cartNewItems
}
override fun getItemCount(): Int {
return cartItems.size
}
class MyViewHolder constructor(itemView: View): RecyclerView.ViewHolder(itemView){
val cartedImg: ShapeableImageView = itemView.myCartedImg
val cartedTitle: TextView = itemView.myCartedTitle
val cartedItemNum: TextView = itemView.myCartItemNum
val cartedLPriceValue: TextView = itemView.localPriceCart
val cartedIPriceValue: TextView = itemView.localPriceCartA
val cartedPlusItem: Button = itemView.incNumCart
val cartedMinusItem: Button = itemView.decNumCart
}
}
Popular.kt
class Popular {
var foodName:String
var foodImage:Int
var foodDollar:String
var foodPrice:Double
var foodDetails:String
constructor(foodName:String, foodImg:Int, foodDollar:String, foodPrice:Double, foodDetails:String){
this.foodName = foodName
this.foodImage = foodImg
this.foodDollar = foodDollar
this.foodPrice = foodPrice
this.foodDetails = foodDetails
}
activity_popular_details.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:layout_marginStart="25dp"
android:layout_marginEnd="25dp"
tools:context=".PopularDetailed">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/pop_local_title"
android:theme="@style/MyPopLocalText"
android:text="@string/hello_blank_fragment"
android:layout_marginTop="35dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/local_price"
android:orientation="horizontal"
android:layout_marginTop="15dp"
app:layout_constraintTop_toBottomOf="@id/pop_local_title"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<TextView
android:id="@ id/localDollarTxt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/dollarSign"
android:textColor="@android:color/holo_orange_light"
android:textSize="16sp"
tools:ignore="TextContrastCheck" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/localPriceValue"
android:text="@string/price_val"
android:textStyle="bold"
android:textColor="@color/black"
android:textSize="16sp"/>
</LinearLayout>
<com.google.android.material.imageview.ShapeableImageView
android:layout_width="300dp"
android:layout_height="350dp"
android:id="@ id/pop_local_img"
android:src="@drawable/hot_breakfast"
android:layout_marginTop="5dp"
app:layout_constraintTop_toBottomOf="@id/local_price"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/incDecItemNum"
android:orientation="horizontal"
app:layout_constraintTop_toBottomOf="@id/pop_local_img"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<ImageView
android:layout_width="35dp"
android:layout_height="35dp"
android:id="@ id/decNum"
android:contentDescription="@string/dollarSign"
android:background="@drawable/inc_dec_back"
android:src="@drawable/minus"
tools:ignore="TouchTargetSizeCheck"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/incDecValue"
android:text="@string/_0"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:textSize="15sp"
android:textStyle="bold"
android:textColor="@color/black"
app:layout_constraintStart_toEndOf="@id/decNum"
app:layout_constraintTop_toTopOf="@id/decNum"
app:layout_constraintBottom_toBottomOf="@id/decNum"/>
<ImageView
android:layout_width="35dp"
android:layout_height="35dp"
android:id="@ id/incNum"
android:layout_marginStart="8dp"
android:contentDescription="@string/dollarSign"
android:background="@drawable/inc_dec_back"
android:src="@drawable/plus"
tools:ignore="TouchTargetSizeCheck"
app:layout_constraintTop_toTopOf="@id/decNum"
app:layout_constraintStart_toEndOf="@id/incDecValue"/>
</androidx.constraintlayout.widget.ConstraintLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/pop_local_des"
android:text="@string/meal_description"
android:layout_marginTop="10dp"
android:theme="@style/MyPopLocalDes"
app:layout_constraintTop_toBottomOf="@id/incDecItemNum"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/local_add_btn"
android:backgroundTint="#FF5E00"
android:text="@string/add_to_cart"
android:textStyle="bold"
android:textSize="17sp"
app:shapeAppearanceOverlay="@style/Button5"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
activity_my_cart_basket.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"
tools:context=".MyCartBasket">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@ id/maiCartV"
android:layout_marginBottom="50dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/myCartView"
android:orientation="vertical"
android:layout_marginTop="15dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/myCartMainText"
android:text="@string/your_cart"
android:theme="@style/MyHeadText"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:id="@ id/myCartDynamic"
android:layout_marginTop="15dp"/>
</LinearLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/itemsTotalPrice"
android:orientation="horizontal"
android:layout_marginTop="25dp"
app:layout_constraintTop_toBottomOf="@id/myCartView"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/totalPriceText"
android:layout_marginStart="15dp"
android:text="@string/items_total_price"
android:textStyle="bold"
android:textColor="@color/black"
android:textSize="16sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/mainTotalValue"
android:text="@string/_0"
android:layout_marginEnd="15dp"
android:textColor="@color/black"
android:textSize="13sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<TextView
android:id="@ id/mainTotalDollar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="5dp"
android:text="@string/dollarSign"
android:textColor="#FF5E00"
android:textSize="13sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@id/mainTotalValue"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="TextContrastCheck" />
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/itemsDeliveryPrice"
android:orientation="horizontal"
android:layout_marginTop="10dp"
app:layout_constraintTop_toBottomOf="@id/itemsTotalPrice"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/totalDeliveryText"
android:layout_marginStart="15dp"
android:text="@string/delivery_services"
android:textStyle="bold"
android:textColor="@color/black"
android:textSize="16sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/mainDeliveryValue"
android:text="@string/_0"
android:layout_marginEnd="15dp"
android:textColor="@color/black"
android:textSize="13sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<TextView
android:id="@ id/mainDeliveryDollar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="5dp"
android:text="@string/dollarSign"
android:textColor="#FF5E00"
android:textSize="13sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@id/mainDeliveryValue"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="TextContrastCheck" />
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/itemsTaxPrice"
android:orientation="horizontal"
android:layout_marginTop="10dp"
app:layout_constraintTop_toBottomOf="@id/itemsDeliveryPrice"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/totalTaxText"
android:layout_marginStart="15dp"
android:text="@string/taxes"
android:textStyle="bold"
android:textColor="@color/black"
android:textSize="16sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/mainTaxValue"
android:text="@string/_0"
android:layout_marginEnd="15dp"
android:textColor="@color/black"
android:textSize="13sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<TextView
android:id="@ id/mainTaxDollar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="5dp"
android:text="@string/dollarSign"
android:textColor="#FF5E00"
android:textSize="13sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@id/mainTaxValue"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="TextContrastCheck" />
</androidx.constraintlayout.widget.ConstraintLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/itemsTotal"
android:orientation="horizontal"
android:layout_marginTop="25dp"
app:layout_constraintTop_toBottomOf="@id/itemsTaxPrice"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/totalTotalText"
android:layout_marginStart="15dp"
android:text="@string/total"
android:textStyle="bold"
android:textColor="@color/black"
android:textSize="25sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/mainTotalV"
android:text="@string/_0"
android:layout_marginEnd="15dp"
android:textColor="@color/black"
android:textSize="18sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<TextView
android:id="@ id/mainTotalD"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="5dp"
android:text="@string/dollarSign"
android:textColor="#FF5E00"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@id/mainTotalV"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="TextContrastCheck" />
</androidx.constraintlayout.widget.ConstraintLayout>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/cart_check_btn"
android:backgroundTint="#FF5E00"
android:text="@string/checkout"
android:textStyle="bold"
android:textSize="25sp"
android:layout_marginStart="50dp"
android:layout_marginEnd="50dp"
android:layout_marginBottom="35dp"
app:shapeAppearanceOverlay="@style/Button5"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
<include layout="@layout/bottom_bar"/>
</androidx.constraintlayout.widget.ConstraintLayout>
I want to add the data which viewed at "PopularDetailedActivity" to "MyCartActivity" without starting it, and then to the adapter of its dynamic recyclerView, and update it. But, i can't access the proper solution.
CodePudding user response：
You need to persist basket data somehow, then pass data itself (or reference to this data) to new screen (MyCartActivity).
The tricky question is to how to persist the data.
IMO, good solution can be to use fragments instead of activities, then you can use sharedViewModel, where you store data with basket items. This shared view model will be accessible by both fragments.
If for some reason you can't use fragments (although I strongly advise to do so), then another solution may be to have some singleton object, where you store basket items. Note though, that usage of singleton objects is risky - for example, when you start updating data in singletons from different places, you may loose control on it at some point in time.
object TempBasketDataHolder {
val basketItems: MutableList<Popular> = mutableListOf()
}
Then in your PopularDetailedActivity you can define methods to handle basket content:
fun clearBasket() {
TempBasketDataHolder.basketItems.clear()
}
fun addBasketItem(item: Popular) {
TempBasketDataHolder.basketItems.add(item)
}
fun removeBasketItem(item: Popular) {
TempBasketDataHolder.basketItems.remove(item)
}
In your MyCartActivity you can then access TempBasketDataHolder.basketItems correspondingly.