如何在Android/Java中为wunderground API获取Json中的元素

Question

我正在使用Wunderground api为安卓应用程序获取每小时的天气预报。我想收到诸如临时工和工作日之类的信息

Json的一个例子是：

"hourly_forecast": [
    {
    "FCTTIME": {
    "hour": "11","hour_padded": "11","min": "00","min_unpadded": "0","sec": "0","year": "2014","mon": "7","mon_padded": "07","mon_abbrev": "Jul","mday": "8","mday_padded": "08","yday": "188","isdst": "1","epoch": "1404842400","pretty": "11:00 AM PDT on July 08, 2014","civil": "11:00 AM","month_name": "July","month_name_abbrev": "Jul","weekday_name": "Tuesday","weekday_name_night": "Tuesday Night","weekday_name_abbrev": "Tue","weekday_name_unlang": "Tuesday","weekday_name_night_unlang": "Tuesday Night","ampm": "AM","tz": "","age": "","UTCDATE": ""
    },
    "temp": {"english": "61", "metric": "16"},
    "dewpoint": {"english": "56", "metric": "13"},
    "condition": "Partly Cloudy",
    "icon": "partlycloudy",
    "icon_url":"http://icons.wxug.com/i/c/k/partlycloudy.gif",
    "fctcode": "2",
    "sky": "58",
    "wspd": {"english": "7", "metric": "11"},
    "wdir": {"dir": "SW", "degrees": "232"},
    "wx": "Partly Cloudy",
    "uvi": "9",
    "humidity": "83",
    "windchill": {"english": "-9999", "metric": "-9999"},
    "heatindex": {"english": "-9999", "metric": "-9999"},
    "feelslike": {"english": "61", "metric": "16"},
    "qpf": {"english": "0", "metric": "0"},
    "snow": {"english": "0", "metric": "0"},
    "pop": "2",
    "mslp": {"english": "29.92", "metric": "1013"}
    }

它似乎位于数组中，但当我尝试以下操作时，它出现了一个错误，即不是json对象

String row = rootArray.getAsJsonObject().get("sky").getAsString(); 

**编辑** 我能让它和代码一起工作

String skyText = rootobj.getAsJsonObject().getAsJsonArray("hourly_forecast").get(0).getAsJsonObject().get("sky").getAsString(); 

rootobj是我的json对象