Exclusive Selection View Collection

MoodEntryFragment.kt

...
        var moods = arrayListOf<String>(
            "UNSELECTED",
            "UNSELECTED",
            "UNSELECTED",
            "UNSELECTED",
            "UNSELECTED"
        )
        for ((index, button) in moodButtonCollection.withIndex()) {
            val thisButtonIndex = index

            button?.setOnClickListener({ view ->
                for ((index, button) in moodButtonCollection.withIndex()) {
                    moods.set(thisButtonIndex, "SELECTED")
                    view.setBackgroundColor(selectedColor);
                    currentMood = Mood.values()[thisButtonIndex]

                    if (moods.get(index) == "SELECTED" && index != thisButtonIndex) {
                        moods.set(index, "UNSELECTED")
                        button?.setBackgroundColor(unselectedColor)
                    }
                };

            })
        }

...