DatabaseException：无法将java.lang.String类型的对象转换为Models.OrderDetails类型

Question

这是我的数据库结构。我正试图获取订单的详细信息。

这是代码

 databaseReference = FirebaseDatabase.getInstance().getReference().child("Admin Order").
            child(userID);
    databaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            for (DataSnapshot childSnapshot: dataSnapshot.getChildren()){
                for (DataSnapshot grandchild : childSnapshot.child("Order Details").getChildren()){
                    OrderDetails details = grandchild.getValue(OrderDetails.class);
                    mList.add(details);
                    progressBar.setVisibility(View.INVISIBLE);
                }
            }
            adapter = new PreviousOrderAdapter(getContext(), mList);
            recyclerView.setAdapter(adapter);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {
            progressBar.setVisibility(View.INVISIBLE);
        }
    });

但我得到了这个错误

这是我得到错误的线

OrderDetails details = grandchild.getValue(OrderDetails.class);

有什么帮助或建议吗？

Answer 1

databaseReference = FirebaseDatabase.getInstance().getReference().child("Admin Order").
            child(userID);
    databaseReference.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            for (DataSnapshot childSnapshot : dataSnapshot.getChildren()) {
                OrderDetails orderDetails = childSnapshot.child("Order Details").getValue(OrderDetails.class);
                Log.w("orderDetails", orderDetails.getConsumer());
                mList.add(details);
                progressBar.setVisibility(View.INVISIBLE);
            }
            adapter = new PreviousOrderAdapter(getContext(), mList);
            recyclerView.setAdapter(adapter);
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {
            progressBar.setVisibility(View.INVISIBLE);
        }
    });