How to return a list from Firestore database as a result of a function in Kotlin?

Question

I\'m building an app for a friend and I use Firestore. What I want is to display a list of favorite places but for some reason, the list is always empty.

I

Answer 1

The reason for having a empty list got perfectly answered by Alex Mamo above.

I just like to present the same thing without needing to add an extra interface.

In Kotlin you could just implement it like so:

fun readData(myCallback: (List) -> Unit) {
    placesRef.get().addOnCompleteListener { task ->
        if (task.isSuccessful) {
            val list = ArrayList()
            for (document in task.result) {
                val name = document.data["name"].toString()
                list.add(name)
            }
            myCallback(list)
        }
    }
}

and then use it like so:

readData() {
   Log.d("TAG", it.size.toString())
})