Jsoup - Android：无法从类中获取样式属性

Question

所以我正在开发一个webapp，我需要从i class获取style属性并从中提取背景URL以在app中使用它...

这是我的AsyncTask方法：

public class GetImageBruh extends AsyncTask<Void, Void, Element> {

    protected Element doInBackground(Void... voids) {
        Element result = null;
        ChatScreen.this.syncCookies();
        int i = 0;

        while (true) {
            int tries = i + ChatScreen.REQUEST_STORAGE;
            if (i >= ChatScreen.MAX_RETRY || result != null) {
                return result;
            }
            Log.i("GetImageBruh", "doInBackground: Processing... Trial: " + tries);
            Log.i("GetImageBruh", "Trying: " + ChatScreen.this.url);
            Element notification = ChatScreen.this.getElement(ChatScreen.this.url);
            if (notification != null) {
                result = notification;
            }
            i = tries;
        }
        return result;
    }


    protected void onPostExecute(Element result) {
        String imageUrl;

        String style = result.select("div._4g34").select("i[aria-label=" + ChatScreen.this.friendName + "]").attr(AnalyticsEvents.PARAMETER_LIKE_VIEW_STYLE);

        try {
            imageUrl = style.substring(style.indexOf("https://"), style.indexOf(")")).replace("\"", BuildConfig.FLAVOR);
        } catch (Exception e) {
            imageUrl = null;
        }
        Log.d("GetImageBruh", "Style: " + imageUrl);
    }
}

private Element getElement(String connectUrl) {
    Element element = null;
    try {
        element = Jsoup.connect(connectUrl).header("Accept-Encoding", "gzip,deflate,sdch").userAgent(this.savedPreferences.getString("webview_user_agent", System.getProperty("http.agent"))).timeout(600000).cookie("m.facebook.com/messages/read/", CookieManager.getInstance().getCookie("m.facebook.com/messages/read")).get();
    } catch (IllegalArgumentException e) {
        Log.i(TAG, "Cookie sync problem occurred");
    } catch (IOException ex) {
        ex.printStackTrace();
    }

    return element;
}    
 

此处friendName等于John Smith ...

HTML结构类似于：

<div class="_4g34">
<div class="di">
<a class="profilePic">
<i class="img profpic" style="background.....">
</i>
</a>
</div>
</div>

什么是打印是“空”... 我在这段代码中做错了什么？