在 Android 中显示 httpGet 和响应之间的进度图像

Question

我使用下面的代码从 Web 服务获取 XML 文件：

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

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

            HttpResponse httpResponse = httpClient.execute(HttpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            xml = EntityUtils.toString(httpEntity,"UTF-8");

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

Web 服务响应请求大约需要 3-4 秒。我想在请求和响应之间的这段时间内显示图像。

最好的方法是什么？

如有任何帮助，我们将不胜感激。

Answer 1

使用AsyncTask

private class LongOperation extends AsyncTask<String, Void, String> {

        @Override
        protected void onPreExecute() {

         // Show image Here
        }
        @Override
        protected String doInBackground(String... params) {
             String xml = null;

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

            HttpResponse httpResponse = httpClient.execute(HttpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            xml = EntityUtils.toString(httpEntity,"UTF-8");

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
            return null;
        }





        @Override
        protected void onPostExecute(String result) {
        /Handle Result From server
        }


        @Override
        protected void onProgressUpdate(Void... values) {
        }

在 Android 中显示 httpGet 和响应之间的进度图像

Showing progress image between httpGet and response in Android

java

android

http-get

httpresponse

httprequest