无法将Firebase arraylist数据转换为对象数据

Question

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    int position = getArguments().getInt("Position");
    String category = new String();
    if(position == 0){
        category = "Burgers";
    }
    if(position == 1){
        category = "Nuggets";
    }

    View view =  inflater.inflate(R.layout.fragment_menu, container, false);
    final ListView listView = view.findViewById(R.id.fragmentList);
    FirebaseDatabase database = FirebaseDatabase.getInstance();
    final DatabaseReference myRef = database.getReference("Category").child(category);
    myRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            ArrayList<Order> orders = new ArrayList<>();
            for(DataSnapshot uniqueKeySnapshot : dataSnapshot.getChildren()) {
                Order order = uniqueKeySnapshot.getValue(Order.class);
                orders.add(order);
            }
            CustomAdapter adapter = new CustomAdapter(orders, getActivity());
            listView.setAdapter(adapter);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            System.out.println("The read failed: " + databaseError.getCode());
        }
    });
    return view;
 }

我想根据位置的不同在listView上显示不同的数据，它可以在第一个选项卡上显示我放置在firebase中的菜单，但是当我滚动这些选项卡时，会在下面显示此错误。

>

  

com.google.firebase.database.DatabaseException：无法转换对象   类型为java.util.ArrayList的类型为com.example.eatfast.Model.Order

有没有办法解决这个问题？