I read this article on changing the Toast message size in Java, but how would this be done in Kotlin?
The equivalent Kotlin code of the answer. Android Studio also transforms Java code into Kotlin automatically. Just copy and paste it.
Edit for activity :
val toast = Toast.makeText(this, "Text" , Toast.LENGTH_SHORT)
//the default toast view group is a relativelayout
val toastLayout = toast.getView() as ViewGroup
val toastTV = toastLayout.getChildAt(0) as TextView
toastTV.setTextSize(30)
toast.show()