java - Android - 如何使用 Android 4.0 下载 XML 文件？

Question

我将使用 Android 4.0 下载 XML 文件，我的旧代码可在 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;
}

我必须有一个没有 DefaultHttpClient 的示例。

Answer 1

从 Gingerbread (2.3) 及更高版本开始，检索 HTTP 数据的首选方法是 HttpUrlConnection。您可能想检查this blog post了解详情。您可能还想检查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();
}