Kotlin - Changing TextView content in popup layout from a different screen

I have this simple layout with a textview, that pops up when being clicked on an image in a different layout.

<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:id="@+id/popupHpPot"
    android:layout_width="match_parent"
    android:layout_height="70dp"
    android:background="#000000">

    <TextView
        android:id="@+id/popupItemDesc"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Potion that restores 3 health."
        android:textColor="#FFEB3B"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

This is the code snippet handling the popup:

 hpPotImg.setOnClickListener(){
            val window = PopupWindow(this)
            val view = layoutInflater.inflate(R.layout.item_popup_tooltip, null)
            window.contentView = view
            val popupLayout = view.findViewById<ConstraintLayout>(R.id.popupHpPot)
            popupLayout.setOnClickListener(){window.dismiss()}
            window.showAsDropDown(hpPotImg)

        }

How could I change the text from the view with "popupItemDesc" id from the setOnClickListener() snippet?

Solution

You will need to use findViewById method with the parent view popupLayout to get the child view of popupItemDesc as below

    val popupItemDesc = popupLayout.findViewById<TextView>(R.id.popupItemDesc)

so the code will be like this

        hpPotImg.setOnClickListener(){
        val window = PopupWindow(this)
        val view = layoutInflater.inflate(R.layout.item_popup_tooltip, null)
        window.contentView = view
        
        val popupLayout = view.findViewById<ConstraintLayout>(R.id.popupHpPot)
        val popupItemDesc = popupLayout.findViewById<TextView>(R.id.popupItemDesc)

        popupItemDesc.text = "hello text changed in parent"

        popupLayout.setOnClickListener(){
            // you can use it here freely also
            popupItemDesc.text = "hello text changed in child popupItemDesc inside popup"

            window.dismiss()
        }
        window.showAsDropDown(hpPotImg)
    }