发布到php服务器后，Http Client变量返回null

Question

我使用Android应用程序（java）将数据发送到mysql数据库并使用php进行传输。我正在使用HttpClient发布它。下面是Http客户端的片段，它是在异步背景上完成的。

EDIT : This is how I am posting the the variables content

  ...
  HashMap<String, String> map = new HashMap<String, String>();
        map.put("url", "../register");
        map.put("id", id.getText().toString());
        map.put("name", name.getText().toString());

        if (!TextUtils.isEmpty(image)) {
            map.put("picture",image);
        }
       new MultiPartRequester(activity, map,1, this);
   ...

这是发射器

...
HttpPost httppost = new HttpPost(urls[0]);
            httpclient = new DefaultHttpClient();

            HttpConnectionParams.setConnectionTimeout(
                    httpclient.getParams(), 200000);

            MultipartEntityBuilder builder = MultipartEntityBuilder
                    .create();

            for (String key : map.keySet()) {

                if (key.equalsIgnoreCase(Params.Image)) {
                    File f = new File(map.get(key));

                    builder.addBinaryBody(key, f,
                            ContentType.MULTIPART_FORM_DATA, f.getName());
                } else {
                    builder.addTextBody(key, map.get(key), ContentType.create("text/plain", MIME.UTF8_CHARSET));
                }


            }
            httppost.setEntity(builder.build());


            HttpResponse response = httpclient.execute(httppost);

            String responseBody = EntityUtils.toString(
                    response.getEntity(), "UTF-8");

            return responseBody;

    ...

现在，上面的客户端运行良好，但是在php文件上接收它后，变量返回null。这就是我用php接收它的方式。

 <?php 
    $id=$_POST['id'];
    $name=$_POST['name'];

    $response["success"]="true";
    $response["id"]=$id;
    echo json_encode($response);


   //The print out
  response :{"success":"true","id":"null"}
 ?>

有什么我真的做错了，我很感激你的帮助。此致！