Question

我从服务器获得以下json。它是一个具有不同对象的json数组。我想基于键“type”识别用户对象，并将它们添加到用户hashmap并获取用户以在我的视图中显示包含“payments”对象的信息。我正在使用gson和改造。 TIA

"included":[
      {
         "id":"1",
         "type":"payments",
         "attributes":{
            "amount_cents":100,
            "amount_currency":"INR",
            "description":"Test description!!",
            "created_at":"2016-03-01T11:30:53Z",
            "status":"paid",
            "paid_at":null,
            "charged_at":null,
            "formatted_amount":"Rs1.00"
         },
         "relationships":{
            "sender":{
               "data":{
                  "id":"2",
                  "type":"users"
               }
            },
            "receiver":{
               "data":{
                  "id":"1",
                  "type":"users"
               }
            }
         }
      },
      {
         "id":"2",
         "type":"users",
         "attributes":{
            "first_name":"Rob",
            "last_name":"Thomas"
         }
      },
      {
         "id":"1",
         "type":"users",
         "attributes":{
            "first_name":"Matt",
            "last_name":"Thomas"
         }
      }]

我的课程

public class ActivityFeedItem implements IFeedItem {
    @SerializedName("id")
    String id;

    @SerializedName("type")
    String type;

    @SerializedName("attributes")
    Attributes attributes;

    protected class Attributes {
        double amount_cents;
        String amount_currency;
        String description;
        String created_at;
        String status;
        String paid_at;
        String charged_at;
        String formatted_amount;

        Relationships relationships;

        public double getAmount_cents() {
            return amount_cents;
        }

        public String getAmount_currency() {
            return amount_currency;
        }

        public String getDescription() {
            return description;
        }

        public String getCreated_at() {
            return created_at;
        }

        public String getStatus() {
            return status;
        }

        public String getPaid_at() {
            return paid_at;
        }

        public String getCharged_at() {
            return charged_at;
        }

        public String getFormatted_amount() {
            return formatted_amount;
        }

        public Relationships getRelationships() {
            return relationships;
        }
    }
}

和

public class UserFeedItem implements IFeedItem {

    @SerializedName("id")
    String id;

    @SerializedName("type")
    String type;

    @SerializedName("attributes")
    Attributes attributes;


    public class Attributes {
        @SerializedName("first_name")
        String first_name;

        @SerializedName("last_name")
        String last_name;
    }
}

Answer 1

如果您只是将JSON响应字符串放入JSONArray，这非常简单。然后，您只需访问type字段并测试它是否为users。像这样：

JSONArray jsonArray = new JSONArray(yourServerResponseString);
for(int i=0; i<jsonArray.length(); i++) {
    JSONObject object = (JSONObject) jsonArray.get(i);
    String type = object.getString("type");
    if(type.equals("users")) {
        //add to your users HashMap
    }
}

Answer 2

首先使用GSON从JSON创建一个对象数组，如下所示

   Gson gson= new Gson();
   String jsonString= yourJsonObject.getString("included");
   ActivityFeedItem[] activityFeedArray=gson.fromJson(jsonString,ActivityFeedItem[].class);

现在您的activityFeedArray包含您在JSON中获得的所有feedItem。然后你可以像在任何数组中那样迭代它，并在type为user时添加到hashmap -

    for(ActivityFeedItem item:activityFeedArray) {
      if(item.type.equals("users")) {
        //add to your users HashMap
       }
    }

使用gson解析具有不同类型的Json对象

2 个答案: