android - 无法在 android 中打开来自 google map api 的流？

Question

当我使用下面的 url 在 android 上的 map 上绘制路线时:

StringBuilder urlString = new StringBuilder();   
   urlString.append("http://maps.google.com/maps?f=d&hl=en");  
   urlString.append("&saddr=");  
   urlString.append(src);  
   urlString.append("&daddr=");// to  
   urlString.append(dest);  
   urlString.append("&ie=UTF8&0&om=0&output=kml");

调用 urlConnection.getInputStream 时抛出异常

HttpURLConnection urlConnection=(HttpURLConnection)url.openConnection();
      urlConnection.setRequestMethod("GET");
      urlConnection.setDoOutput(true);
      urlConnection.setDoInput(true);
      urlConnection.connect(); 

      DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
      DocumentBuilder db = dbf.newDocumentBuilder();
      doc = db.parse(urlConnection.getInputStream()); 

新代码:

Document doc=null;

        try
        { 

            String url = getUrl(p, q);
            DocumentBuilderFactory dbfAdd = DocumentBuilderFactory.newInstance();
            DocumentBuilder dbAdd = dbfAdd.newDocumentBuilder();
            doc = dbAdd.parse(url.toString());

Answer 1

IIRC Android 的 XML 文档解析器无法处理阻塞的 InputStream。最好使用为您下载的 parse() 版本，即:

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
doc = db.parse(urlString.toString());