在Android中解析嵌套的JSONObject

Question

在我的项目中，我从HTTP响应中获得以下JSON。

{"base":"USD","date":"2015-04-24","rates":{"AUD":1.2827,"BGN":1.8069,"BRL":2.9733,"CAD":1.2119,"CHF":0.9551,"CNY":6.1948,"CZK":25.364,"DKK":6.8927,"GBP":0.6614,"HKD":7.75,"HRK":7.0284,"HUF":278.53,"IDR":12954.0,"ILS":3.9244,"INR":63.563,"JPY":119.51,"KRW":1078.25,"MXN":15.358,"MYR":3.5741,"NOK":7.8298,"NZD":1.3216,"PHP":44.281,"PLN":3.7076,"RON":4.08,"RUB":51.215,"SEK":8.6674,"SGD":1.3375,"THB":32.55,"TRY":2.7314,"ZAR":12.182,"EUR":0.9239}} 

我想从上面的json中获得“BGN”。如何得到它。

Answer 1

有涉及多个步骤这个

首先：创建一个JSONObject

JSONObject jObject = new JSONObject(yourJSON_String); 

二：得到您想要的对象或数组，你的情况

obj = getJSONObject("rates") 

三：获取所需字符串

obj.getString("BGN"); 

这里是JSON CLASS REFERENCE

Answer 2

JSONObject responseJson = new JSONObject("<your-string">); 
JSONObject ratesJson = responseJson.getJSONObject("rates"); 
double rate = ratesJson.getDouble("BGN"); 

清楚地看到JSON对象，请使用PrettyJson。在这里复制粘贴JSON字符串，它会向您显示嵌套对象（如果有的话）以清楚地理解响应。

Answer 3

假设你正在使用的JSONObject，你的根文件被称为“文档”，

JSONObject rates = doc.getJSONObject("rates")会得到你的利率部分：

{"AUD":1.2827,"BGN":1.8069,"BRL":2.9733,"CAD":1.2119,"CHF":0.9551,"CNY":6.1948,"CZK":25.364,"DKK":6.8927,"GBP":0.6614,"HKD":7.75,"HRK":7.0284,"HUF":278.53,"IDR":12954.0,"ILS":3.9244,"INR":63.563,"JPY":119.51,"KRW":1078.25,"MXN":15.358,"MYR":3.5741,"NOK":7.8298,"NZD":1.3216,"PHP":44.281,"PLN":3.7076,"RON":4.08,"RUB":51.215,"SEK":8.6674,"SGD":1.3375,"THB":32.55,"TRY":2.7314,"ZAR":12.182,"EUR":0.9239}

这个对象，那么你可以简单地得到使用

String bgn = rates.getString("BGN")