解析來自Web服務器

Question

JSON數組我會從網絡服務器解析JSON數組到Android app.The陣列看起來像這樣

{"Level": 
     [ 
     {"route":[{"lat":38.889762,"lgn":-77.081764}, 
     {"lat":38.89096,"lgn":-77.081916}]}, 
     {"route":[{"lat":38.889762,"lgn":-77.081764}, 
     {"lat":38.89096,"lgn":-77.081916}]}, 
     {"route":[{"lat":38.889762,"lgn":-77.081764}, 
     {"lat":38.89096,"lgn":-77.081916}]} 
     ] 
} 

我的Java代碼

 JSONObject json = new JSONObject(result); 
    JSONArray jArray = json.getJSONArray("Level"); 
    rlevel = new ArrayList<LatLng>(); 
    System.out.println("*****JARRAY*****"+jArray.length()); 

    for(int i=0;i<jArray.length();i++){ 


    JSONObject json_data = jArray.getJSONObject(i); 

    jlat = json_data.getDouble("lat"); 
    jlgn = json_data.getDouble("lgn");} 

而不是作品！ ？任何想法後此我想每個路線保存到一個數組（等$計劃[1] =從JSON第一路線，$計劃[2] =從JSON第二路徑）

Answer 1

嘗試是這樣的：

//代碼是保存在JSON

JSonObject json= new JsonParser().parse(code).getAsJsonObject(); 
JsonArray jArray= json.getAsJsonArray("Level"); 
rLevel=new ArrayList<LatLng>(); 

//notice the use of the size() method. There is not length() method defined for ArrayList 
System.out.println("*****JARRAY*****"+jArray.size()); 

for(int i=0;i<jArray.size();i++){ 

//notice that inside the Level Array you have route-arrays 
    JSonObject level_item = jArray.get(i).getAsJsonObject(); 
    JSonArray route= level_item.getAsJSonArray("route"); 

//now I don't know exactly what data you want to extract, since there are 2 
//pairs of LatLng, for the first one: 
jlat = route.get(0).get("lat").getAsDouble(); 
jlgn= route.get(0).get("lgn").getASDouble(); 

的方法和一個JSONObjects確切名稱往往從圖書館到另一個不同的字符串，但原理是一樣的。

Answer 2

這個解析任務可以很容易地使用droidQuery來完成：

try { 
    JSONObject json = $.parseJSON(result); 
    if (json.has("Level")) { 
     Object[] datas = $.makeArray(json.getJSONArray("Level")); 
     for (Object data : datas) { 
      JSONObject obj = (JSONObject) data; 
      Object[] coordinates = $.makeArray(obj.getJSONArray("route")); 
      for (Object coord : coordinates) { 
       Map<String, ?> map = $.map((JSONObject) coord); 
       double latitude = (Double) map.get("lat"); 
       double longitude = (Double) map.get("lgn"); 
       //TODO: do something with these values 
      } 
     } 
    } 
    else { 
     Log.d("JSON", "Result does not contain 'Levels' variable"); 
    } 
} 
catch (Throwable t) { 
    t.printStackTrace(); 
}