使用HttpUrlconnection在Rss阅读器中会导致Android挂起

Question

我制作了一个可以使用的RSS阅读器，但是我想使用HttpUrlConnection方法设置与RSS URL的连接。当我尝试时，程序在我点击“读取Rss”按钮后锁定了：

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;
    }

}

这是我现在使用的连接方法，它可以正常工作：

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;
    }

}

感谢您能提供的任何帮助！

- Nathaniel Warren

Answer 1

您需要做的是将其放入一个字符串中，我称之为results。我已经附上了我的doInBackground代码。通过将其添加到一个字符串中，它有一个存储提要的位置。并且它适用于rss阅读器。

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;
    }

- Amanda