使用AsyncTask在按钮单击时执行网络操作为：

public class onbuttonclickHttpPost extends AsyncTask<String, Void, Void> {
    @Override
    protected String doInBackground(String... params) {
        byte[] result = null;
        String str = "";
       // Create a new HttpClient and Post Header
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://www.yoursite.com/script.php");

        try {
                // Add your data
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
                nameValuePairs.add(new BasicNameValuePair("id", "12345"));
                nameValuePairs.add(new BasicNameValuePair("stringdata", "AndDev is Cool!"));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                // Execute HTTP Post Request
                HttpResponse response = httpclient.execute(httppost);
                StatusLine statusLine = response.getStatusLine();
                if(statusLine.getStatusCode() == HttpURLConnection.HTTP_OK){
                result = EntityUtils.toByteArray(response.getEntity());
                str = new String(result, "UTF-8");
            }
          } catch (ClientProtocolException e) {
            // TODO Auto-generated catch block
        } catch (IOException e) {
            // TODO Auto-generated catch block
        }  
        return str;
    }

    /**
     * on getting result
     */
    @Override
    protected void onPostExecute(String result) {
        // something with data retrieved from server in doInBackground
    }
}

然后在Button上单击Start AsyncTask onbuttonclickHttpPost作为：

buttonclick.setOnClickListener(new View.OnClickListener()
        {
         public void onClick(View v) {
         new onbuttonclickHttpPost.execute(null);

     }
      });