how to update Textview in main activity with button in adapter? - kotlin

Question

i want to update the value of my textview that is in the PosActivity when the button in MyAdapter is click ( to increase/decrease the quantity and to delete the card from recycler view). and i can't find anything on how to do it.
here is what i tried.
in MyAdapter :
package com.mycodlabs.pos.ui.sale.adapter
import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import com.mycodlabs.pos.R
import com.mycodlabs.pos.domain.inventory.ProductModel
import kotlinx.android.synthetic.main.pos_item_card.view.*
import java.math.BigDecimal
class MyAdapter(mUx: Context, var selectedItems: ArrayList<ProductModel>) : RecyclerView.Adapter<MyAdapter.ViewHolder>() {
val mUx = mUx
// var quantity = 1
var totalPrice = BigDecimal.ZERO
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
var pclose = itemView.removeItempos
var pname = itemView.pos_name
var pprice = itemView.pos_price
var pqty = itemView.pos_qty
var pminus = itemView.cart_minus_img
var pplus = itemView.cart_plus_img
// val pimage = itemView.pos_image
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val view = LayoutInflater.from(parent.context).inflate(R.layout.pos_item_card, parent, false)
return ViewHolder(view)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val pos: ProductModel = selectedItems[position]
holder.pname.text = pos.name
holder.pprice.text = pos.unitPrice.toString()
holder.pqty.text = pos.quantity.toString()
// holder.pimage.= pos.image
holder.pclose.setOnClickListener {
val username = pos.name
var price = pos.unitPrice
totalPrice -= price
selectedItems.removeAt(position)
notifyDataSetChanged()
notifyItemRangeChanged(position, selectedItems.size)
// Toast.makeText(mUx, "User $username Deleted", Toast.LENGTH_SHORT).show()
}
holder.pminus.setOnClickListener {
if(pos.quantity == 1 ){
// Toast.makeText(mUx,"Can't go any lower", Toast.LENGTH_SHORT).show()
}else {
pos.quantity -= 1
notifyItemChanged(position)
}
}
holder.pplus.setOnClickListener {
pos.quantity += 1
notifyItemChanged(position)
}
}
fun grandTotal(items: ArrayList<ProductModel>): BigDecimal {
totalPrice = BigDecimal.ZERO
for (i in items.indices) {
totalPrice += items[i].unitPrice.multiply(items[i].quantity.toBigDecimal())
}
return totalPrice
}
fun clearData() {
selectedItems.clear()
notifyDataSetChanged()
}
override fun getItemCount() = selectedItems.size
}
and in the Activity:
package com.mycodlabs.pos.ui
import android.os.Bundle
import android.view.View
import android.widget.*
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.google.android.material.bottomsheet.BottomSheetBehavior
import com.mycodlabs.pos.R
import com.mycodlabs.pos.db.AndroidDatabase
import com.mycodlabs.pos.db.DatabaseTables
import com.mycodlabs.pos.db.inventory.InventoryDbo
import com.mycodlabs.pos.db.sale.SalesLinesDao
import com.mycodlabs.pos.domain.inventory.ProductModel
import com.mycodlabs.pos.ui.sale.adapter.MyAdapter
import kotlinx.android.synthetic.main.activity_pos.*
import kotlinx.android.synthetic.main.adapter_available_promotions.*
import kotlinx.android.synthetic.main.dialog_paymentsuccession.view.*
import kotlinx.android.synthetic.main.dialog_saleedit.*
import kotlinx.android.synthetic.main.layout_addcategory.*
import kotlinx.android.synthetic.main.layout_sale.*
import kotlinx.android.synthetic.main.listview_stock.*
import kotlinx.android.synthetic.main.pos_bottom_sheet.*
import kotlinx.android.synthetic.main.pos_item_card.*
class PosActivity : AppCompatActivity() {
private lateinit var bottomSheetBehavior: BottomSheetBehavior<LinearLayout>
private lateinit var productNames: ArrayList<String>
private lateinit var recyclerView: RecyclerView
private lateinit var db: SalesLinesDao
//// Create an empty list to store the selected items
var selectedItems = ArrayList<ProductModel>()
//// Create an adapter for the RecyclerView
val adapter = MyAdapter(this,selectedItems)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_pos)
// for Back button
back.setOnClickListener {
finish()
}
check_out_Pos.setOnClickListener{
// val pos = ProductModel()
//
// db = SalesLinesDbo(this)
//
// pos.name = pos_name.text.toString()
//
// db.addLineItem(pos.id, LineItemModel())
adapter.clearData()
}
// val autoCompleteTextView = findViewById<AutoCompleteTextView>(R.id.searchBoxPos)
// autoCompleteTextView.threshold = 0
// val suggestions =InventoryDbo.getInstance(applicationContext).allProduct
// var NameArray=suggestions.toList().filter { t -> t.name.contains(autoCompleteTextView)}.toList().map { m->m.name }
// val arrayAdapter = ArrayAdapter(this, android.R.layout.simple_expandable_list_item_2 ,NameArray)
// autoCompleteTextView.setAdapter(arrayAdapter)
// Auto Complete Textview filtering from Product table colm "productName"
val autoCompleteTextView = findViewById<AutoCompleteTextView>(R.id.searchBoxPos)
val productNames = ArrayList<String>()
val dbHelper = AndroidDatabase(this)
val db = dbHelper.readableDatabase
val cursor = db.rawQuery(
"SELECT DISTINCT ${InventoryDbo.colm_productName} FROM ${DatabaseTables.TABLE_PRODUCT} WHERE ${InventoryDbo.colm_productName} like '%%'",
null
)
if (cursor.moveToFirst()) {
do {
productNames.add(cursor.getString(cursor.getColumnIndex(InventoryDbo.colm_productName)))
} while (cursor.moveToNext())
}
cursor.close()
db.close()
val adapterr = ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line, productNames)
autoCompleteTextView.setAdapter(adapterr)
// //// Auto Complete suggestion item display in recyclerview on select
// // Create the RecyclerView
val recyclerView = findViewById<RecyclerView>(R.id.sale_List_Pos)
//// Create a layout manager for the RecyclerView
val layoutManager = LinearLayoutManager(this)
recyclerView.layoutManager = layoutManager
recyclerView.adapter = adapter
// Set an item click listener for the AutoCompleteTextView
searchBoxPos.setOnItemClickListener { _, _, position, _ ->
// Get the selected product name and product from the list
val selectedItem = autoCompleteTextView.adapter.getItem(position).toString()
// val selectedProductName = productNames[position]
val selectedProduct = InventoryDbo.getInstance(applicationContext).getPosProductByName(selectedItem).first()
//InventoryDbo.getProductByName(selectedProductName)
// Add the selected product to the selected items list
selectedItems.add(selectedProduct)
// Notify the adapter that the data has changed
adapter.notifyDataSetChanged()
// Clear the focus and text from the AutoCompleteTextView
searchBoxPos.clearFocus()
searchBoxPos.setText("")
total_items_Pos.text = adapter.grandTotal(selectedItems).toString()
}
//for the bottomsheet
bottomSheetBehavior = BottomSheetBehavior.from<LinearLayout>(std_btm_sht)
bottomSheetBehavior.setBottomSheetCallback(object :
BottomSheetBehavior.BottomSheetCallback() {
override fun onStateChanged(bottomSheet: View, state: Int) {
print(state)
when (state) {
BottomSheetBehavior.STATE_HIDDEN -> {
}
BottomSheetBehavior.STATE_EXPANDED -> {
total_items_Pos.text = adapter.grandTotal(selectedItems).toString()
}
BottomSheetBehavior.STATE_COLLAPSED -> {
total_items_Pos.text = adapter.grandTotal(selectedItems).toString()
}
BottomSheetBehavior.STATE_DRAGGING -> {
total_items_Pos.text = adapter.grandTotal(selectedItems).toString()
}
BottomSheetBehavior.STATE_SETTLING -> {
total_items_Pos.text = adapter.grandTotal(selectedItems).toString()
}
BottomSheetBehavior.STATE_HALF_EXPANDED -> {
total_items_Pos.text = adapter.grandTotal(selectedItems).toString()
}
}
}
override fun onSlide(bottomSheet: View, slideOffset: Float) {
}
})
}
}
i hope you can help me solve this because it was bugging me all day and i couldn't find anything about it

Answer 1

I'll post the changes for the plus button, you can then repeat it for the others. Mind that this is just an example, as I don't know in what way you'd like to update the text or what's the actual name of your TextView.
class MyAdapter(
mUx: Context,
var selectedItems: ArrayList<ProductModel>,
val plusLambda: (String) -> Unit // <------
) : RecyclerView.Adapter<MyAdapter.ViewHolder>() {
...
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val pos: ProductModel = selectedItems[position]
...
holder.pplus.setOnClickListener {
pos.quantity += 1
plusLambda("The new quantity is: ${ pos.quantity }") // <------
notifyItemChanged(position)
}
...
class PosActivity : AppCompatActivity() {
...
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_pos)
...
val adapterr = ArrayAdapter(this,
android.R.layout.simple_dropdown_item_1line,
productNames) {
someTextView.text = it // <------
}
autoCompleteTextView.setAdapter(adapterr)
...
Of course, you can use just one lambda for all buttons if all you want to do is to change the text of the TextView.