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我試圖讀取Android上的這個json字符串,但字段「縮略圖」總是返回空,即使它實際上沒有空,它應該返回一個url或「自我」。當在Android上解析時,Json值返回空(當它不是)
{
"kind": "t3",
"data": {
"domain": "twitter.com",
"banned_by": null,
"media_embed": {},
"subreddit": "nba",
"id": "3y6vzw",
"author": "Higgnkfe",
"media": null,
"score": 883,
"approved_by": null,
"over_18": false,
"hidden": false,
"num_comments": 811,
"thumbnail": "http://b.thumbs.redditmedia.com/rfBhblr-DJIfsCEwQ9jq-wy_mHcmmedx3_Xy60STumc.jpg",
"subreddit_id": "t5_2qo4s",
"stickied": false,
"from": null,
"is_self": false,
"from_id": null,
"permalink": "/r/nba/comments/3y6vzw/first_all_star_results_are_in_kobe_steph_lead_the/",
"created": 1451088664.0,
"url": "https://twitter.com/nbaallstar/status/680417825463365632",
"title": "First All Star Results are in; Kobe, Steph lead the vote",
"created_utc": 1451059864.0,
"ups": 883
}
這裏有一段代碼,我使用閱讀:
String title, author, subreddit, id, thumbnail = "test", url;
int score, numOfComments;
double created;
boolean isSelf;
JSONArray arr = new JSONObject(raw).getJSONObject("data").getJSONArray("children");
for (int i = 0; i < arr.length(); i++) {
JSONObject data = arr.getJSONObject(i).getJSONObject("data");
Log.d("LOADER", "JSON: " + data.toString());
title = data.getString("title");
author = data.getString("author");
subreddit = data.getString("subreddit");
id = data.getString("id");
thumbnail = data.getString("thumbnail");
score = data.getInt("score");
Log.d("LOADER", " thumb: " + thumbnail); // log shows "thumb:" only
url = data.getString("url");
created = data.getDouble("created");
isSelf = data.getBoolean("is_self");
numOfComments = data.getInt("num_comments");
Post post = new Post(subreddit, title, author, url, id, score, numOfComments,
thumbnail, created, isSelf);
posts.add(post);
}
我沒有問題,閱讀任何其他領域,甚至是「URL」欄中也包含一個URL,所以它不能說......
這是日誌顯示data.toString():
JSON: {"domain":"self.nba","banned_by":null,.....(etc etc etc).......,"id":"3y46dt","num_comments":787,"thumbnail":"","subreddit_id":"t5_2qo4s","is_self":true,"from_id":null,"url":"https:\/\/www.reddit.com\/r\/nba\/comments\/3y46dt\/trash_talk_thread_no_games_today_because_of\/","author_flair_text":"[TOR] Luis Scola"....etc
正如你所看到的,「縮略圖」 H作爲「」的值,但「url」確實有一個url。
這是怎麼回事?
這裏就是我得到的JSON字符串在情況下,它是非常有用的http://www.reddit.com/r/nba/.json
你使用什麼瀏覽器?當我用Chrome打開它時,它可能是「自我」或網址。我檢查了IE瀏覽器,但下載的文件顯示一個空值。我猜Android也一樣。 –
@JorgeGil我使用了chrome,然後https://jsonformatter.curiousconcept.com/來格式化json以清楚地看到它。 –
如果我使用Chrome瀏覽器並將輸出複製並粘貼到您發佈的網站上,我會獲得「thumbnail」的值,但是如果我只是直接將網址粘貼到網站上,我就沒有價值,我不知道發生了什麼... –