Android Studio, Firebase Verileri nasıl listelerim ?

Android Studio daki verileri Firebase den çekebiliyorum ama listview içerisinde listeletemiyorum. Normal sout içerisinde veya textview içerisinde geliyor ama Listview de görünmüyor.

Kodlar bu şekilde. Nerede hatam var acaba ?

package com.example.azizmuhasebeguncel;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.database.ChildEventListener;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import java.util.ArrayList;
import java.util.Map;

public class ListUserPage extends AppCompatActivity {

    private FirebaseDatabase mydatabase;
    private DatabaseReference myref;

    private ListView listView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list_user_page);
        listView = findViewById(R.id.musteriler);

         final ArrayList<String> list = new ArrayList<>();
         final ArrayAdapter adapter = new ArrayAdapter(ListUserPage.this,android.R.layout.simple_list_item_1,list);


        myref = FirebaseDatabase.getInstance().getReference().child("Musteriler");
        // My top posts by number of stars
        myref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot postSnapshot: dataSnapshot.getChildren()) {
                    String value = postSnapshot.getValue(String.class).toString();
                    System.out.println("Deger: " + value);
                    list.add(value);
                    listView.setAdapter(adapter);
                    adapter.notifyDataSetChanged();
                }
            }
            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });
    }
}

Yardımcı olursanız çok sevinirim.