如何使 JSONArray 为空或删除它答案

【问题标题】：How to make JSONArray empty or delete it如何使 JSONArray 为空或删除它
【发布时间】：2012-04-09 09:02:01
【问题描述】：

完成一个活动的执行后，我想让 jSONArray 为空或删除它。因为当我重复调用活动时，新数据会附加到 JSONArray 中存在的旧数据。我的jsonArray如下图..

[{"record":[
            {......},
            {.......}
           ]
 },
 {"record":[
            {..........},
            {.........}
           ]
 }
] 


First time:
[{"record":[{"intensity":"Low","Body_SubParts":"Scalp","symptom":"Bleeding"}]}]

Second time:
[{"record":[{"intensity":"Low","Body_SubParts":"Scalp","symptom":"Bleeding"},
{"intensity":"Low","Body_SubParts":"Eyes","symptom":"Bleeding"}]}]

【问题讨论】：

标签： android json

【解决方案1】：

构建JSON数组后，将JSONArray对象无效化。下次再构建JSON数组

【讨论】：

【解决方案2】：

已回复here

// Assuming you have constructed the replacement as
JSONObject jsonArray11_obj2 = new JSONObject();
jsonArray11_obj2.put("intensity", "high");
jsonArray11_obj2.put("Body_SubParts", "Scalp");
// ...

// Then the code doing the replacement would look similar to
int index = 0;
((JSONObject)jsonArray.get(index)).getJSONArray("record").put(0, jsonArray11_obj2);

【讨论】：