<How to return data from inside of addOnSuccessLis...

# stackoverflow

[user]

How to return data from inside of addOnSuccessListener{} method in Kotlin?
I am trying to get user data from Firebase Firestore database ,
I am intended to get info of user who is currently logged in.
Now for make this information accessible from other Classes I created get method for username and email,
when I used get method from Another class , I got an indexOutOfBoundsException with index 0,size 0.
It looks like my array in global scope is not getting data when i called array.add() method from addOnSuccessListener method.
package...