java.lang.NumberFormatException: For input string: "16000$" in kotlin - android-studio

Question

I want to make display show "16000$" before click increase btn or decrease btn.
when I make code like this error caused by :java.lang.NumberFormatException: For input string: "16000$ . but I should display $. Lets check my code and help me plz.
var productprice = findViewById<TextView>(R.id.productPrice)
productprice.text= intent.getStringExtra("price")+"$"
var price = productPrice.text.toString().toInt()
var inc_val= price
var getPrice = price
decrease.isEnabled=false
increase.setOnClickListener {
increaseInteger()
getPrice+= inc_val
productprice.text=getPrice.toString()+"$"
}
decrease.setOnClickListener {
decreaseInteger()
getPrice -= inc_val
productprice.text=getPrice.toString()+"$"
}

Answer 1

You are trying to parse the string with "$" to int, Hence you are getting NumberFormatException.
Try this instead:
var productprice = findViewById<TextView>(R.id.productPrice)
productprice.text= intent.getStringExtra("price")+"$"
var price = parseInt(intent.getStringExtra("price"))
var inc_val= price
var getPrice = price
decrease.isEnabled=false
increase.setOnClickListener {
increaseInteger()
getPrice+= inc_val
productprice.text=getPrice.toString()+"$"
}
decrease.setOnClickListener {
decreaseInteger()
getPrice -= inc_val
productprice.text=getPrice.toString()+"$"
}

Answer 2

var price = productPrice.text.toString().toInt() - you try to convert "16000$" to Int here. Please get substring here first.
Formally, right code is:
val priceText = productPrice.text.toString()
val price = priceText.substring(0, priceText.length - 1).toInt()
However really I advice you to store value internally. You price is part of model. E.g. you can avoid text parsing and just read value from model. E.g. code will be like this:
var price = intent.getIntExtra("price") // we store int value here, not String
var inc_val= price
decrease.isEnabled=false
displayPrice()
increase.setOnClickListener {
intent.setIntExtra(intent.getIntExtra("price") + inc_val) // read, update, save
displayPrice()
}
decrease.setOnClickListener {
intent.setIntExtra(intent.getIntExtra("price") - inc_val) // read, update, save
displayPrice()
}
/*this function just shows price*/
fun displayPrice() {
val price = intent.getIntExtra("price")
productprice.text= "$price\$"
}