Question

我将使用Android 4.0下载XML文件，我的旧代码在Android 2.3.3上运行：

public String getXmlFromUrl(String url) {
    String xml = null;

    try {
        // defaultHttpClient
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        HttpResponse httpResponse = httpClient.execute(httpPost);
        HttpEntity httpEntity = httpResponse.getEntity();
        xml = EntityUtils.toString(httpEntity);

    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    // return XML
    return xml;
}

我有一个没有DefaultHttpClient的示例。 T.I.A。

Answer 1

从Gingerbread（2.3）开始，检索HTTP数据的首选方法是HttpUrlConnection。您可能需要查看this blog post以获取详细信息。您可能还想查看Javadoc for HttpUrlConnection

URL url = new URL("http://www.android.com/");
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
try {
    InputStream in = new BufferedInputStream(urlConnection.getInputStream());
    readStream(in);
} finally {
    urlConnection.disconnect();
}

Answer 2

你的问题可能就是“严格模式”。

您必须使用线程或AsyncTask执行http请求。

class RequestTask extends AsyncTask<String, String, String>{

        @Override
        protected String doInBackground(String... params) {
             //http request here
            //return the response as string
        }
        @Override
        protected void onPostExecute(String result) {
            //set the the data you get
        }

然后：

new RequestTask().execute(yourHttpRequestString)

Android - 如何使用Android 4.0下载XML文件？

2 个答案: