在Android中解析JSON结果

Question

嗨，我有以下JSON结果：

{
    "returnCode": "1",
    "result": [
        {
            "id": "109",
            "account_id": "159",
            "created_on": "2013-11-29 10:46:41",
            "title": "iphone 5",
            "currency_code": "USD",
            "price": "500",
            "is_owner": "0",
            "photoCount": 1,
            "commentList": [
                {
                    "account_id": "159",
                    "created_on": "2013-11-29 10:46:41",
                    "name": "Jane Doe",
                    "comment": "Blah.. blah... blah..."
                },
                {
                    "id": "134",
                    "account_id": "144",
                    "created_on": "2013-12-04 16:21:49",
                    "name": "John Doe",
                    "comment": "Blah.. blah.. blah..."
                }
            ],
            "count_like": "1",
            "count_dislike": "0",
            "count_favorite": "0",
            "count_comment": "1",
            "is_order": "0"
        }
    ]
}

这是我的代码：

public ArrayList<Comment> getComments(String jData) throws JSONException{
    JSONObject jObj = new JSONObject(jData);
    ArrayList<Comment> cList = new ArrayList<Comment>();
    JSONArray jCommentArr = jObj.getJSONArray("commentList");

    servResponse = (int) jObj.getInt("returnCode");
    if(servResponse == 1){
        for(int i=0; i<jCommentArr.length(); i++)
        {
            Comment comment = new Comment();
            JSONObject jComment = jCommentArr.getJSONObject(i);

            comment.commenterId = (int) jComment.getInt("account_id");
            comment.commenterName = (String) jComment.getString("name");
            comment.commentMessage = (String) jComment.getString("comment");
            comment.postDate = (String) jComment.getString("created_on");

            cList.add(comment);
        }
    }
    return cList;
}

我只对JSON中的注释数组感兴趣（由“ commentList”标记指定。

但是，我的代码总是抛出JSON异常，表明cList包含空值。 谁能指出我的代码出错了怎么办？

谢谢

Answer 1

尝试这个..

JSONObject jObj = new JSONObject(jData);
ArrayList<Comment> cList = new ArrayList<Comment>();
servResponse = Integer.parseInt(jObj.getString("returnCode").trim());
JSONArray objarr = jObj.getJSONArray("result");
for(int i = 0;i< objarr.length();i++){
    JSONObject jCment = objarr.getJSONObject(i);
    if(servResponse == 1){
       JSONArray jCommentArr = jCment.getJSONArray("commentList");
          for(int j=0; j<jCommentArr.length(); j++)
          {
              Comment comment = new Comment();
              JSONObject jComment = jCommentArr.getJSONObject(j);

              comment.commenterId = Integer.parseInt(jComment.getString("account_id").trim());
              comment.commenterName = jComment.getString("name").trim();
              comment.commentMessage = jComment.getString("comment").trim();
              comment.postDate = jComment.getString("created_on").trim();

              cList.add(comment);
          }
    }
}

Answer 2

-> JSONArray jCommentArr = jObj.getJSONArray("commentList");

更改为-> JSONArray jCommentArr = jObj.getJSONArray("result");

Answer 3

干得好 ：

 JSONObject jObj = new JSONObject(jData);
 ArrayList<Comment> cList = new ArrayList<Comment>();
 JSONArray jTemp = jObj.getJSONArray("result");
 JSONArray jCommentArr = jTemp.getJSONObject(0).getJSONArray("commentList");

Answer 4

这是因为您直接访问commentList，它是结果数组中包含的值。 您必须先访问它。

JSONArray commentList = jObj.getJSONArray("result").getJSONArray("commentList");