DateEditText.kt

class DateEditText : AppCompatEditText(context, attrs, defStyleAttr) {
   private var canChange: Boolean = false
   private var actualText: StringBuilder = StringBuilder()

   override fun onSelectionChanged(selStart: Int, selEnd: Int) {
       super.onSelectionChanged(selStart, selEnd)
       if (!canChange) return
       canChange = false
       setSelection(actualText.length)
       canChange = true
   }

}