在Rss Reader中使用HttpUrlconnection会导致Android挂起

Question

我整理了一个RSS阅读器，它按原样工作，但我想使用HttpUrlConnection方法设置与RSS URL的连接。 当我尝试它时，在单击“读取Rss”按钮后，该程序被锁定：

private class getRssFeedTask extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... params) {
        try {
            URL rssUrl = new URL(params[0]);
            HttpURLConnection urlIn = (HttpURLConnection) rssUrl.openConnection();
            InputStream in = new BufferedInputStream(urlIn.getInputStream());
            String line;
            feed = "";
            while ((line = in.toString()) != null) {
                feed += line;
            }
            in.close();
            return feed;
        } catch (MalformedURLException ue) {
            System.out.println("Malformed URL");
        } catch (IOException ioe) {
            System.out.println("The URL is unreachable");
        }
        return null;
    }

}

这是我坚持使用的连接方法，可以起作用：

private class getRssFeedTask extends AsyncTask<String, Void, String> {
    @Override
    protected String doInBackground(String... params) {
        try {
            URL rssUrl = new URL(params[0]);
            BufferedReader in = new BufferedReader(new InputStreamReader(rssUrl.openStream()));
            String line;
            feed = "";
            while ((line = in.readLine()) != null) {
                feed += line;
            }
            in.close();
            return feed;
        } catch (MalformedURLException ue) {
            System.out.println("Malformed URL");
        } catch (IOException ioe) {
            System.out.println("The URL is unreachable");
        }
        return null;
    }

}

感谢您的任何帮助，您可以提供！

Answer 1

您需要做的是将其放入一个我称之为结果的字符串中。 我已经为doInBackground附加了代码。 通过将其添加到字符串中，它可以存储提要。 它适用于RSS读者。

public String doInBackground(String... urls){

        String result = "";
        try{
            URL url = new URL(urls[0]);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            InputStream in = conn.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(in));
            String line = "";

            while((line = reader.readLine()) != null){
                result = result + line;
            }

            conn.disconnect();
        }
        catch(Exception e){
            Log.e("ERROR Fetching ", e.toString());
        }
        return result;
    }