Where the textview id can be set in kotlin ?

 In Kotlin, the ID of a TextView can be set in the XML layout file using the android:id attribute. For example:

<TextView
    android:id="@+id/my_textview"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Hello, World!" />

In this example, the ID of the TextView is set to "my_textview".

Once the layout file has been inflated, the TextView can be referenced in the Kotlin code using the findViewById() method. For example:

val myTextView: TextView = findViewById(R.id.my_textview)

In this example, the variable "myTextView" is assigned the TextView with the ID "my_textview". You can also use the Kotlin synthetic properties to directly access the view by ID, like this :

my_textview.text = "New Text"

This will set the text of the textview to "New Text".