How to sort CopyOnWriteArrayList

Question

I want to sort CopyOnWriteArrayList. But when I tried to run the following code

It is throwing unsorted operation exception.

Answer 1

Kotlin helper function

inline fun > CopyOnWriteArrayList.sortListBy(crossinline selector: (T) -> R?) {
    if (size > 1) {
        val list = ArrayList(this)
        list.sortBy(selector)
        clear()
        addAll(list)
    }
}

On Android

inline fun > CopyOnWriteArrayList.sortListBy(crossinline selector: (T) -> R?) {
    if (size > 1) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            sortBy(selector)
        } else {
            val list = ArrayList(this)
            list.sortBy(selector)
            clear()
            addAll(list)
        }
    }
}