Question

我正在尝试解析Android中的JSON文档，我之前已经能够使用相同的逻辑进行解析。但在网站的这一部分我的代码似乎打破了，我花了好几个小时试图比较发生了什么变化，但我不知道。我在这里缺少什么？

有人可以告诉我为什么我的尝试失败了吗？

目标JSON

[ { "data" : { "after" : null,
    "before" : null,
    "children" : [ { "data" : { "approved_by" : null,
              "author" : "BuzzAldrinHere",
              "author_flair_css_class" : null,
              "author_flair_text" : null,
              "banned_by" : null,
              "clicked" : false,
              "created" : 1404871393.0,
              "created_utc" : 1404842593.0,
              "distinguished" : null,
              "domain" : "self.IAmA",
              "downs" : 0,
              "edited" : 1404849572.0,
              "gilded" : 0,
              "hidden" : false,
              "id" : "2a5vg8",
              "is_self" : true,
              "likes" : null,
              "link_flair_css_class" : "science",
              "link_flair_text" : "",
              "media" : null,
              "media_embed" : {  },
              "name" : "t3_2a5vg8",
              "num_comments" : 7331,
              "num_reports" : null,
              "over_18" : false,
              "permalink" : "/r/IAmA/comments/2a5vg8/i_am_buzz_aldrin_engineer_american_astronaut_and/",
              "saved" : false,
              "score" : 4968,
              "secure_media" : null,
              "secure_media_embed" : {  },
              "selftext" : "I am hopi...

代码尝试

JSONObject response = new JSONObject(result);
        JSONObject data = response.getJSONObject("data");
        JSONArray hotTopics = data.getJSONArray("children");
        for(int i=0; i<hotTopics.length(); i++) {
            JSONObject topic = hotTopics.getJSONObject(i).getJSONObject("data");
            DetailsData item = new DetailsData();
            item.setAuthor(topic.getString("author"));

            item.setPostTime(topic.getLong("created_utc"));
            item.setScore(topic.getString("score"));
            item.setComment(topic.getString("selftext"));

看似相同的JSON，它实际上适用于

{ "data" : { "after" : "t3_2a8ij0",
  "before" : null,
  "children" : [ { "data" : { "approved_by" : null,
            "author" : "JiveMonkey",
            "author_flair_css_class" : null,
            "author_flair_text" : null,
            "banned_by" : null,
            "clicked" : false,
            "created" : 1404948237.0,
            "created_utc" : 1404919437.0,
            "distinguished" : null,
            "domain" : "i.imgur.com",
            "downs" : 0,
            "edited" : false,
            "gilded" : 0,
            "hidden" : false,
            "id" : "2a8tuu",
            "is_self" : false,
            "likes" : null,
            "link_flair_css_class" : null,
            "link_flair_text" : null,
            "media" : null,
            "media_embed" : {  },
            "name" : "t3_2a8tuu",
            "num_comments" : 1932,
            "num_reports" : null,
            "over_18" : false,
            "permalink" : "/r/pics/comments/2a8tuu/norway_has_invented_a_bicycle_escalator/",
            "saved" : false,
            "score" : 4894,
            "secure_media" : null,
            "secure_media_embed" : {  },
            "selftext" : "",
            "selftext_html" : null,
            "stickied" : false,
            "subreddit" : "pics",
            "subreddit_id" : "t5_2qh0u",
            "thumbnail" : "http://a.thumbs.redditmedia.com/nIstmQ8l1jl-UiU8.jpg",
            "title" : "Norway has invented a bicycle escalator",
            "ups" : 4894,
            "url" : "http://i.imgur.com/ACr2e4h.jpg",
            "visited" : false
          },
        "kind" : "t3"
      },

Answer 1

目标JSON是JSONArray，其中“看似相同”的JSON是JSONObject

我想象一下，如果您查看抛出的JSONException的堆栈跟踪，它会告诉您JSONArray无法解析为JSONObject

要解析它，您可以将代码更改为以下内容：

JSONArray jArr = new JSONArray(result);
JSONObject response = jArr.getJSONObject(0); // grab the first object in the array

JSON解析在android中抛出JSON异常

1 个答案: