android和服务器进行交互的时候往往会有数据的传输，而数据中有一种类型就是Json型，这两天在研究API接口的问题，服务器返回的数据类型都是Json型的。例如：

1.接收到的json字符串分为两种一种为array型，一种为Object型。下面就是Object型（嵌套型）：

{"errNum":0,"errMsg":"success","retData":{"city":"\u5317\u4eac","pinyin":"beijing","citycode":"101010100","date":"15-07-21","time":"11:00","postCode":"100000","longitude":116.391,"latitude":39.904,"altitude":"33","weather":"\u96f7\u9635\u96e8","temp":"28","l_tmp":"22","h_tmp":"28","WD":"\u65e0\u6301\u7eed\u98ce\u5411","WS":"\u5fae\u98ce(<10m\/h)","sunrise":"05:02","sunset":"19:38"}}

2.提取其中的value值：

（代码已测试）

String response = (String) msg.obj;                // Json字符串解析                String errMsg = null;                int errNum = 2;                try {                    JSONObject jsonObject = new JSONObject(response.toString());                    errMsg = jsonObject.getString("errMsg");                    errNum = jsonObject.getInt("errNum");                } catch (JSONException e1) {                    // TODO 自动生成的 catch 块                    e1.printStackTrace();                }                    JSONObject jsonObject1 = null;                    try {                        jsonObject1 = new JSONObject(response.toString())                                .getJSONObject("retData");                    } catch (JSONException e) {                        // TODO 自动生成的 catch 块                        e.printStackTrace();                    }                    String city = null;                    String date = null;                    String time = null;                    String weather = null;                    String temp = null;                    String l_tmp = null;                    String h_tmp = null;                    String WD = null;                    String WS = null;                    String sunrise = null;                    String sunset = null;                    try {                        city = jsonObject1.getString("city");                        date = jsonObject1.getString("date");                        time = jsonObject1.getString("time");                        weather = jsonObject1.getString("weather");                        temp = jsonObject1.getString("temp");                        l_tmp = jsonObject1.getString("l_tmp");                        h_tmp = jsonObject1.getString("h_tmp");                        WD = jsonObject1.getString("WD");                        WS = jsonObject1.getString("WS");                        sunrise = jsonObject1.getString("sunrise");                        sunset = jsonObject1.getString("sunset");                    } catch (JSONException e) {                        // TODO 自动生成的 catch 块                        e.printStackTrace();                    }