firestore read data adding hashmap get data when added

Question

when the user presses the button onlick ,read data and add hashmap When completed I want to read with getfirestore2() method

data to come comment1 comment2 comment3 comment4

but incoming data with getfirestore2() method comment 4

my using method failed and not safe because I use delay

I how to fix codes?

my codes

    binding.AllAskedBtn.setOnClickListener {
        a1hliste.clear()
        a2hliste.clear()
        a3hliste.clear()
        a4hliste.clear()

         fun getfirestore2(){
            println("listedekiler A1 "+a1hliste)
            println("listedekiler A2 "+a2hliste)
            println("listedekiler A3 "+a3hliste)
            println("listedekiler A4 "+a4hliste)
            println("\n veri 2 db size "+dbsize)
             var sayi=0


             var g1=a1hliste.getValue(sayi).toString()
             var g2=a2hliste.getValue(sayi).toString()
             var g3=a3hliste.getValue(sayi).toString()
             var g4=a4hliste.getValue(sayi).toString()

                for (a in 0..dbsize-1){
                    db.collection(g1).document(g2).collection(g3).document(g4).addSnapshotListener { task,e->
                        var veri= task!!.get("comment") as String
                        println("This is the data from "+veri)
                    }
                }

                }


       db.collection("users").document(uuid).collection("Questions").orderBy("date",Query.Direction.DESCENDING).addSnapshotListener{ result, e->
           var veri=result!!.documents
           var verisize=result!!.documents.size
           dbsize=0
           for (a in veri){
               var dersler=a.get("FBDersler") as String
               var konular=a.get("FBKonular") as String
               var sinavturu=a.get("sinavturu") as String
               var QuestionUİD=a.get("QuestionUİD") as String


               a1hliste.put(dbsize,sinavturu.toString())
               a2hliste.put(dbsize,dersler.toString())
               a3hliste.put(dbsize,konular.toString())
               a4hliste.put(dbsize,QuestionUİD.toString())
               dbsize+=1

               GlobalScope.launch {
                   delay(2000L)
                   if (dbsize==verisize){
                       getfirestore2()
                   }
               }
           }
           println("db size "+dbsize)
       }





    }