BufferedReader中返回null [英] Bufferedreader returning null

问题描述

我试图从文本读取网址，然后让应用程序打开该地址，我的缓冲读者似乎被正确读取行，但readline的不断回来空

 字符串rsslink = NULL;
    InputStream为= getResources（）openRawResource（R.raw.xmlsource）。
    BR的BufferedReader =新的BufferedReader（新的InputStreamReader（是））;    尝试{
        而（（rsslink = br.readLine（））！= NULL）
        {        }
    }
    赶上（IOException异常E）
    {
        e.printStackTrace（）;
    }
    字符串RSS_LINK = rsslink;    Log.d（Constants.TAG，服务启动）;
    清单＆LT;＆的RSSItem GT;的RSSItems = NULL;
    尝试
    {
        XMLRssParser分析器=新XMLRssParser（）;
        的RSSItems = parser.parse（的getInputStream（RSS_LINK））;
 

解决方案

您将得到最后一行是空rsslink 。
你需要改变你的循环

  {尝试
        而（（rsslink = br.readLine（））！= NULL）
        {        }
    }
 

到

  {尝试
        StringBuilder的SB =新的StringBuilder（）;
        而（（rsslink = br.readLine（））！= NULL）
        {
               sb.append（rsslink）;
        }
        rsslink = sb.toString（）;
    }
 

i'm trying to read a web address from a text and then have the app open that address, my buffered reader seems to be reading the lines correctly but readline keeps coming back null

String rsslink = null;
    InputStream is = getResources().openRawResource(R.raw.xmlsource);
    BufferedReader br = new BufferedReader(new InputStreamReader(is));

    try {
        while ((rsslink = br.readLine()) != null) 
        {

        }
    } 
    catch (IOException e) 
    {
        e.printStackTrace();
    }
    String RSS_LINK = rsslink;

    Log.d(Constants.TAG, "Service started");
    List<RssItem> rssItems = null;
    try 
    {
        XMLRssParser parser = new XMLRssParser();
        rssItems = parser.parse(getInputStream(RSS_LINK));

解决方案

You will get the last line that is null rsslink. You need to change your loop

try {
        while ((rsslink = br.readLine()) != null) 
        {

        }
    } 

to

 try {
        StringBuilder sb=  new StringBuilder();
        while ((rsslink = br.readLine()) != null) 
        {
               sb.append(rsslink);
        }
        rsslink = sb.toString();
    } 

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