retreive data from realtime firebase and show them in recyclerview

Question

how to retrieve all data (data, user data) and show them in recycler view but I need them in other class (User)

here is JSON data :

{
  "data" : {
    "3XU5Z3Izm3MusCt8prrIRgNQkt52" : {
      "-LmodIxoJ9BtUk62gImX" : {
        "id" : "-LmodIxoJ9BtUk62gImX",
        "notes" : "description",
        "timee" : "3:40 PM",
        "title" : "title"
      },
      "-LmodK25AqrR07Cwoiww" : {
        "id" : "-LmodK25AqrR07Cwoiww",
        "notes" : "description",
        "timee" : "3:41 PM",
        "title" : "title"
      },
      "-LmodKX0SoAbD928REwT" : {
        "id" : "-LmodKX0SoAbD928REwT",
        "notes" : "description",
        "timee" : "3:41 PM",
        "title" : "title"
      }
    }
  },
  "userdata" : {
    "3XU5Z3Izm3MusCt8prrIRgNQkt52" : {
      "job" : "",
      "username" : "f2f."  }
}
    }

I write ("data")in this class

class Note{
     var title:String?=null
      var notes:String?=null
     var timee :String?=null
    var id :String?=null
constructor(){}
    constructor(id:String?="",title:String?=""
         ,notes:String?="",timee :String?=""){
        this.id=id
        this.title=title
        this.notes=notes
        this.timee=timee }
}

I write ("userdata")in this class :

class Note2{
    var username: String?=null
    var job:String?=null
constructor(){}
constructor(username: String?="", job: String?="")  {
    this.username=username
    this.job=job
}
}

and I wanted to show them in this class ("User"):

data class User (var username:String,
                 var userphoto:Int,
                 var title:String,
                 var notes:String
)

here is my MainActivity.class :

    class RecyclerActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener{
        var mylist2=ArrayList<Note2>()
        var mylist=ArrayList<Note>()
        var currentuser = FirebaseAuth.getInstance().currentUser!!
        var db= FirebaseDatabase.getInstance()
        var ref = db.getReference()
        var aa=db.getReference("userdata")

        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_recycler)
       var myarray=ArrayList<User>()
        ref.child("data").child(currentuser.uid)
            .addValueEventListener(object: ValueEventListener {
                override fun onDataChange(p0: DataSnapshot) {
                            var va=p0.value as HashMap<Any?,Any?>
                            for(k in va.keys) {
                                var data = va[k] as HashMap<String?, Any?>               myarray.add(User("",0,data["title"]?.toString()!!,data["notes"]?.toString()!!))
}}
                override fun onCancelled(p0: DatabaseError) {
                    var error=p0.message
                    Toast.makeText(applicationContext,error, Toast.LENGTH_LONG).show()
                }
            })

        aa.child(currentuser.uid)
            .addValueEventListener(object: ValueEventListener {
                override fun onDataChange(p0: DataSnapshot) {
                    var r = p0.getValue(Note2::class.java)
                    if(r!!.username !=null){
                        myarray.add(User(r.username!!,0,"",""))
                    }
                    }
                override fun onCancelled(p0: DatabaseError) {
                    var error=p0.message
                    Toast.makeText(applicationContext,error, Toast.LENGTH_LONG).show()
                }
            })
        val c= CustomAdapter(myarray)
        idrecycler.layoutManager= LinearLayoutManager(this, LinearLayout.VERTICAL,false)
        idrecycler.adapter=c
        }}

here is my CustomAdapter.class :

class CustomAdapter (var mylist:ArrayList<User>)
    :RecyclerView.Adapter<CustomAdapter.viewHolde>(){
    val str= FirebaseStorage.getInstance().reference
    var currentuser = FirebaseAuth.getInstance().currentUser!!.uid
    var e = str.child(currentuser)
 var c:Context?=null
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): viewHolde {

        var v=LayoutInflater.from(parent.context)
            .inflate(R.layout.iktem_list,parent,false)
        return viewHolde(v)
    }

    override fun getItemCount(): Int {
        return mylist.size
    }

    override fun onBindViewHolder(holder: viewHolde, position: Int) {
       holder.username.setText(mylist.get(position).username)
        holder.userimage.setImageResource(R.drawable.user)
        holder.title.setText(mylist.get(position).title)
        holder.decription.setText(mylist.get(position).notes)

    }
    class viewHolde(item:View):RecyclerView.ViewHolder(item){
val username=item.findViewById(R.id.iduser)as TextView
        val userimage=item.findViewById(R.id.idcircleImageView)as CircleImageView
        val title=item.findViewById(R.id.idtitle)as TextView
        val decription=item.findViewById(R.id.iddes)as TextView
}}

I want to show all data in recycler view (Note2().username in User().username and Note().title in User().title and Note().notesin User().notes) like facebook home, pleaze help

REMARQUE: it is working like that but it shows data for 1 user