Android 如何使JSONArray为空或删除它

在完成一个活动的执行之后，我想使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中的旧数据中。我的jsonArray如下所示

[{"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"}]}]

回答

---

构建

JSON

数组后，将

JSONArray

对象置空。下次再次构建

JSON

数组

// 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);