从 JSONArray 获取特定值

Question

>我得到了一个jsonarray：

  [
    {
        "ean": "8020079127",
        "nr": "100",
        "name": "Name1"
    },
    {
        "ean": "8026180222",
        "nr": "4",
        "name": "Name2"
    },
    {
        "ean": "6577426092",
        "nr": "1",
        "name": "Name3"
    }
]

我需要"nr"的值，具体取决于"ean"表示：我得到了 ean 8026180222（作为字符串），需要来自"nr"的值（这里是"4"）。我怎样才能得到它？无需迭代整个数组即可吗？

谢谢

Answer 1

试试这个：

     // Use a map to store ean,nr (as key/value)
     HashMap<String, String> jsonMap = new HashMap<String, String>();
     // Load the data from json 
     JSONArray jsonArray= new JSONArray(yourJsonString);
     for (int i = 0; i < jsonArray.length(); i++) {
        JSONObject jsonObj = jsonArray.getJSONObject(i);
        String ean = jsonObj.getString("ean");
        String nr = jsonObj.getString("nr");
        String name = jsonObj.getString("name");
        jsonMap.put(ean, nr);  // here you put ean as key and nr as value
     }

要检索特定 ean 的 nr 值，只需调用： jsonMap.get(yourEAN);

示例：String nr = jsonMap.get("8026180222");

Answer 2

List<NameValuePair> params = new ArrayList<NameValuePair>();
JsonObject json = jsonParser.makeHttpRequest(url, "GET", params);
                    Log.d("Tag", json.toString());
                    int success = json.getInt(TAG_SUCCESS);
                    if (success == 1) {
                        JSONArray jsnObj;
                        try {
                            jsnObj = json
                                .getJSONArray(TAG_ARRAY);
                            JSONObject obj = jsnObj
                                    .getJSONObject(1);
        String nr = obj.getString(TAG_NR);
                            }
                        Catch(Exception ex){}
                 }
          }

如果你想要数组，你可以在json数组中使用循环......希望会有所帮助

只需定义

   private static final String TAG_SUCCESS = "success";
   private static final String TAG_NR = "nr";
   private static final String TAG_ARRAY = "array_name";