Android volley将空值发布到数据库

Question

我的应用程序应该将一些数据发送到我的php脚本，然后php脚本将其推送到我的在线数据库。但该应用程序不断发送空值，并使用一个简单的HTML表单尝试我的PHP脚本，它完美地工作并发布到数据库。

使用排球图库还是新手。

这是我的注册类：

private void registerfunc(final String name, final String email, final String phone, final String address) {`

    String url ="http://circleincoprated.com/apps/register.php";

    StringRequest stringRequest = new StringRequest(Request.Method.POST, url,
            new Response.Listener<String>() {
                @Override
                public void onResponse(String response) {
                    Log.d("JSon data... ", response);
                    if (response.trim().equals("success")) {
                        pd.hide();
                        Toast.makeText(first_run.this, "registration Successful", Toast.LENGTH_LONG).show();
                        Intent in = new Intent(first_run.this, MainActivity.class);
                        startActivity(in);
                    } else {
                        pd.hide();
                        Toast.makeText(first_run.this, "registration Failed" + response, Toast.LENGTH_LONG).show();

                    }
                }
            },
            new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    pd.hide();
                    Log.d("JSon Error... ", error.toString());
                    Toast.makeText(first_run.this, error.toString(), Toast.LENGTH_LONG).show();

                }
            }) {
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            //Creating parameters
            Map<String, String> params = new Hashtable<>();
            //Adding parameters
            params.put("name", name);
            params.put("phone", phone);
            params.put("email", email);
            params.put("address", address);


            //returning parameters
            return params;
        }
    };

    new MySingleton(first_run.this).addToRequestQueue(stringRequest);
}

虽然这是我的php脚本：

<?php
 extract($_POST);
 if(isset($name)){
 $resp='';
    include 'config.php';
 $sql = "INSERT INTO users (id,name,phone,email,address)
  VALUES ('','".$name."', '".$phone."', '".$email."','".$address."')";

if ($conn->query($sql) === TRUE) {
 $resp="success";
    echo($resp);
 $sql = "INSERT INTO log (id,response) Values('','".$resp."')";
 $conn->query($sql);
 }else {
   $resp= "Error: " . $sql . "<br>" . $conn->error;
 $conn->query($sql);
 echo($resp);
}}else{
   echo "Empty data";
  }
?>