Question

我必须每周都赚比特币钱。如果我使用JsonObject，则得到json，但是我不能使用循环来获取所有数据。而且，如果我使用JSONObject，则返回null。拜托，救救我！

这是我的api：

https://api.coindesk.com/v1/bpi/historical/close.json?start=2018-08-01&end=2018-08-19

{"bpi":{"2018-08-01":7603.7488,"2018-08-02":7535.02,"2018-08-03":7415.5613,"2018-08-04":7009.0888,"2018-08-05":7026.9913,"2018-08-06":6937.0738,"2018-08-07":6717.2088,"2018-08-08":6280.58,"2018-08-09":6537.9025,"2018-08-10":6143.305,"2018-08-11":6233.3813,"2018-08-12":6312.8338,"2018-08-13":6252.37,"2018-08-14":6192.3063,"2018-08-15":6270.0425,"2018-08-16":6314.2413,"2018-08-17":6583.2388,"2018-08-18":6395.3525},"disclaimer":"This data was produced from the CoinDesk Bitcoin Price Index. BPI value data returned as USD.","time":{"updated":"Aug 19, 2018 13:06:45 UTC","updatedISO":"2018-08-19T13:06:45+00:00"}}

Answer 1

您可以使用如下所示的解析数据

 JSONObject sys  = reader.getJSONObject("bpi");
 String country = sys.getString("2018-08-01");

如果它是动态的，那么您可以像下面这样使用

JSONObject mainJSONObj=new JSONObject(<json_string>);
// get category JSONObject from mainJSONObj
JSONObject categoryJSONObj=mainJSONObj.getJSONObject("category");
// get all keys from categoryJSONObj
Iterator<String> iterator = categoryJSONObj.keys();
  while (iterator.hasNext()) {
    String key = iterator.next();
    Log.i("TAG","key:"+key +"--Value::"+categoryJSONObj.optString(key);
  }

无论如何，您都可以尝试Retrofit＆Gson进行解析，使其成为模型并易于解析。

Answer 2

使用Gson，只需在模型类中添加以下代码即可。

@SerializedName("bpi")
JsonElement results;

public Map<String, String> getResults() {
    Type type = new TypeToken<Map<String, String>>() {}.getType();

    final Map<String, String> objects = new Gson().fromJson(results, type);
    return objects;
}

这是您的模型类的外观

public class Model {
    @SerializedName("disclaimer")
    private String disclaimer;

    @SerializedName("time")
    private Time time;

    @SerializedName("bpi")
    JsonElement results;

    public Map<String, String> getResults() {
        Type type = new TypeToken<Map<String, String>>() {}.getType();
        final Map<String, String> objects = new Gson().fromJson(results, type);
        return objects;
    }

    public String getDisclaimer() {
        return disclaimer;
    }

    public void setDisclaimer(String disclaimer) {
        this.disclaimer = disclaimer;
    }

    public Time getTime() {
        return time;
    }

    public void setTime(Time time) {
        this.time = time;
    }

    public class Time {

        @SerializedName("updated")
        private String updated;

        @SerializedName("updatedISO")
        private String updatedISO;

        public String getUpdated() {
            return updated;
        }

        public void setUpdated(String updated) {
            this.updated = updated;
        }

        public String getUpdatedISO() {
            return updatedISO;
        }

        public void setUpdatedISO(String updatedISO) {
            this.updatedISO = updatedISO;
        }
    }
}

这是您的API接口方法

@GET("/v1/bpi/historical/close.json")
Call<Model> getData(@Query("start") String start,@Query("end") String end);

如何解析键和值的JSON？

2 个答案: