java在Android中从URL读取XML文件

Question

我尝试了几种从链接打开XML文件的方法，但所有这些方法都没有任何效果。 为了确保解析XML文件是好的，我下载了该文件并将其放在Asset文件夹中，以便解析所有这些内容。 我们可以由此推断从url读取时的错误

URL是http://feeds.bbci.co.uk/sport/0/football/rss.xml?edition=uk

HttpClient httpclient = new DefaultHttpClient();
HttpGet httppost = new HttpGet(url.toString());
HttpResponse response = httpclient.execute(httppost);
InputStream in=response.getEntity().getContent();

或者

HttpURLConnection con=(HttpURLConnection)url.openConnection();
InputStream in=con.getInputStream();

或者

InputStream in =url.openStream();

请帮帮我

我的问题解决了谢谢大家的帮助。当我从Url获取文件时，我应该使用AsyncTask类

Answer 1

  String TextHolder = "", TextHolder2 = "";
public class GetNotePadFileFromServer extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        progressDialog.show();
    }
    @Override
    protected Void doInBackground(Void... params) {
        String userId = SharedPrefHelper.getPrefsHelper().getPref(SharedPrefHelper.PREF_USER_ID);

        try {
            URL url = new URL(baseUrl+"fileName.xml");
            BufferedReader bufferReader = new BufferedReader(new InputStreamReader(url.openStream()));
            while ((TextHolder2 = bufferReader.readLine()) != null) {
                TextHolder += TextHolder2;
            }
            bufferReader.close();

        } catch (MalformedURLException malformedURLException) {
            malformedURLException.printStackTrace();
            TextHolder = malformedURLException.toString();

        } catch (IOException iOException) {
            iOException.printStackTrace();
            TextHolder = iOException.toString();
        }
        return null;

    }

    @Override
    protected void onPostExecute(Void finalTextHolder) {
        Document doc = convertStringToXMLDocument( TextHolder );
        doc.getDocumentElement().normalize();
        NodeList nList = doc.getElementsByTagName(ApiConstant.ApiKeys.SMS_MESSAGE);
        for (int temp = 0; temp < nList.getLength(); temp++) {
            Node nNode = nList.item(temp);
            if (nNode.getNodeType() == Node.ELEMENT_NODE) {
                Element eElement = (Element) nNode;

                Sms sms = new Sms(
                        eElement.getElementsByTagName(ApiConstant.ApiKeys.SMS_IDS).item(0).getTextContent(),
                        eElement.getElementsByTagName(ApiConstant.ApiKeys.SMS_ADDRESS).item(0).getTextContent(),
                        eElement.getElementsByTagName(ApiConstant.ApiKeys.SMS_BODY).item(0).getTextContent(),
                        eElement.getElementsByTagName(ApiConstant.ApiKeys.SMS_READ).item(0).getTextContent(),
                        eElement.getElementsByTagName(ApiConstant.ApiKeys.SMS_DATE).item(0).getTextContent(),
                        eElement.getElementsByTagName(ApiConstant.ApiKeys.SMS_TYPE).item(0).getTextContent(),
                        false
                );

                LogClass.e("mysms",""+sms.getAddress());
                smsArrayList.add(sms);
            }
        }

        setUi();
        progressDialog.dismiss();
        super.onPostExecute(finalTextHolder);
    }

}


  new GetNotePadFileFromServer().execute();