Unable to fetch correct json string

[pancake leh]

I am currently working an android app that login users.Upon login, users are allowed name their own create a file. However, upon executing this function as shown below, the return json contain the JSON string of the login details instead.

I am using a xmapp server.

Does anyone have any idea of the correct way of obtaining the returned json string of the createNewFile details ?

public JSONObject createNewFile(String f_id, String userid, String name){
        // Building Parameters
        List params= new ArrayList();
        
		params.add(new BasicNameValuePair("tag", createFile));
		params.add(new BasicNameValuePair("fid", fid));
		params.add(new BasicNameValuePair("userid", userid));
		params.add(new BasicNameValuePair("name", name));

 
        // getting JSON Object
        JSONObject json =  jsonParser.getJSONFromUrl(URL, params);
        // return json
        return json;
    }


//use for login

    public JSONObject loginUsers(String email, String password){
            // Building Parameters
            List params = new ArrayList();
            params.add(new BasicNameValuePair("tag", login_tag));
            params.add(new BasicNameValuePair("email", email));
            params.add(new BasicNameValuePair("password", password));
            JSONObject json = jsonParser.getJSONFromUrl(loginURL, params);
            // return json
            Log.e("JSON", json.toString());
            return json;
        }

This is my `JSONPARSER` class.

public class JSONParser {
    	 
        static InputStream is = null;
        static JSONObject jObj = null;
        static String json = "";
     
        // constructor
        public JSONParser() {
     
        }
     
        public JSONObject getJSONFromUrl(String url, List params) {
     
            // Making HTTP request
            try {
                // defaultHttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setEntity(new UrlEncodedFormEntity(params));
     
                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();
     
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();  
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
     
            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(
                        is, "iso-8859-1"), 8);
                        
                        
                StringBuilder sb = new StringBuilder();
                String line = null;
                while ((line = reader.readLine()) != null) {
                    sb.append(line + "n");
                }
                is.close();
                json = sb.toString();
                Log.e("JSON", json);
               
            } catch (Exception e) {
                Log.e("Buffer Error", "Error converting result " + e.toString());
            }
     
            // try parse the string to a JSON object
            try {
                jObj = new JSONObject(json);
            } catch (JSONException e) {
                Log.e("JSON Parser", "Error parsing data " + e.toString());
            }
     
            // return JSON String
            return jObj;
     
        }
       
    }

Php files:

DB_Functions

    public function storeFile($fid, $userid, $name){

		$con = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD);

        mysqli_select_db($con, DB_DATABASE);


        $result = mysqli_query($con,"INSERT INTO file_info(fid, userid, name) VALUES('$fid', '$userid', '$name',  NOW())");
        // check for successful store
        if ($result) {
            // get file details 
            $fid = mysqli_insert_id($con); // last inserted id
            $result = mysqli_query($con,"SELECT * FROM file_info WHERE fid = $fid");
            // return file details
            return mysqli_fetch_array($result);
        } else {
            return false;
        }
    }

index.php

//add_file
     if ($tag == 'add_file') {
            // Request type is add new file
            $fid = $_POST['fid'];
            $userid = $_POST['userid'];
            $name = $_POST['name'];
    
                $file_info= $db->storeFile($fid, $userid, $name);
                if ($file_info) {
                    // user stored successfully
                    $response["success"] = 1;
                    $response["fid"] = $file_info["fid"];
                    $response["file_info"]["userid"] = $file_info["userid"];
                    $response["file_info"]["name"] = $ufile_info["name"];
                          
    				
    				echo json_encode($response);
    				
                } else {
                    // user failed to store
                    $response["error"] = 1;
                    $response["error_msg"] = "Error occured in Adding";
                    echo json_encode($response);
                }
            }else {
            echo "Invalid Request";
        } 
    
    
    
    } else {
        echo "Access Denied";
    }

Error faced:

Invalid RequestInvalid Requestn
Error parsing data org.json.JSONException: Value Invalid of type java.lang.String cannot be converted to JSONObject