com.firebase.client.FirebaseException：无法跳转到键入

Question

我是使用Firebase和Android的新手。我有一个项目，可以在一个孩子中保存订单和付款，并在适配器中显示所有内容。但是从模型类中获取postSnapshot的数据时会显示错误。我不知道我项目的错误在哪里。像这样的错误：

  

com.firebase.client.FirebaseException：无法退回键入

和

  

引起：com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException：无法识别的字段＆＃34;付款＆＃34;

我的firebase结构如下：

然后这是我的java代码：

MainActivity.java

String status = "orderSucces";
    Firebase ref = new Firebase("https://myfirebase-d8a8a.firebaseio.com/order");
    orderID = "-Kxi37Ro2oCPxQkb5L5u";
    Query query = ref.child(status).orderByChild("orderID").equalTo(orderID);
    query.addValueEventListener(new com.firebase.client.ValueEventListener() {
        @Override
        public void onDataChange(com.firebase.client.DataSnapshot dataSnapshot) {
            progressBar.setVisibility(View.VISIBLE);
            if (dataSnapshot.exists()) {
                for (com.firebase.client.DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                    OrderModel data = postSnapshot.getValue(OrderModel.class);
                    orderModel.add(data);
                    adapter = new Adapter(getApplication(), orderModel);
                    //adding adapter to recyclerview
                    recyclerView.setAdapter(adapter);
                    progressBar.setVisibility(View.GONE);
                }
            } else {
                progressBar.setVisibility(View.GONE);
            }
        }

        @Override
        public void onCancelled(FirebaseError firebaseError) {

        }
    });
}

OrderModel.java

public class PemesananModel implements Serializable {

    public String orderID, paymentID, buyerName, buyerPhone, paymentMethod;

    PemesananModel() {}

    public PemesananModel(String orderID, String paymentID, String buyerName, String buyerPhone, String paymentMethod) {
        this.orderID = orderID;
        this.paymentID = paymentID;
        this.buyerName = buyerName;
        this.buyerPhone = buyerPhone;
        this.paymentMethod = paymentMethod;
    }

    public String getOrderID() {
        return orderID;
    }

    public void setOrderID(String orderID) {
        this.orderID = orderID;
    }

    public String getPaymentID() {
        return paymentID;
    }

    public void setPaymentID(String paymentID) {
        this.paymentID = paymentID;
    }

    public String getBuyerName() {
        return buyerName;
    }

    public void setBuyerName(String buyerName) {
        this.buyerName = buyerName;
    }

    public String getBuyerPhone() {
        return buyerPhone;
    }

    public void setBuyerPhone(String buyerPhone) {
        this.buyerPhone = buyerPhone;
    }

    public String getPaymentMethod() {
        return paymentMethod;
    }

    public void setPaymentMethod(String paymentMethod) {
        this.paymentMethod = paymentMethod;
    }
}

Answer 1

由于您的JSON没有名为payment的属性，因此您似乎只是在JSON树中以错误的级别读取数据。

解决方案是将您的侦听器附加到树中的正确级别，如下所示：

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
DatabaseReference paymentRef = rootRef
    .child("order")
    .child("orderSucces")
    .child(orderID)
    .child("payment");