问如何更新从没有用户帐户的数据库中获取的列表视图

EN

public class CustomerDataRetrieved extends AppCompatActivity {

    private ListView listView;
    DatabaseReference databaseReference;
    Firebase firebase;
    List<CustomerName> customerNameList;
    public static final String Database_Path = "Customer Details";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_customer_data_retrieved);


        listView = (ListView) findViewById(R.id.list_view);

        firebase = new Firebase(Firebase_Server_URL);

        databaseReference = FirebaseDatabase.getInstance().getReference(Database_Path);

        customerNameList = new ArrayList<>();



    }

    @Override
    protected void onStart() {
        super.onStart();
        databaseReference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                for (DataSnapshot customerSnapshot : dataSnapshot.getChildren()) {

                    CustomerName customers = customerSnapshot.getValue(CustomerName.class);
                    customerNameList.add(customers);
                }
                CustomerInfoAdapter customerInfoAdapter = new CustomerInfoAdapter(CustomerDataRetrieved.this,customerNameList);
                listView.setAdapter(customerInfoAdapter);

            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });
    }
}