@Override
    protected String doInBackground(String... params) {
        String username = params[0];
        String password = params[1];
        String loginURL = "http://10.0.3.2/carapp/login.php";
        String data = "";

        try {
            URL url = new URL(loginURL);
            String urlParams = URLEncoder.encode("username", "UTF-8") + "=" + URLEncoder.encode(username, "UTF-8") + "&" +
                    URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode(password, "UTF-8");
            System.out.println(urlParams);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            OutputStream os = httpURLConnection.getOutputStream();
            BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            bufferedWriter.write(urlParams);
            bufferedWriter.flush();
            bufferedWriter.close();
            System.out.println(bufferedWriter);

            InputStream is = httpURLConnection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"));
            while ((tmp = is.read()) != -1) {
                data += (char) tmp;
            }

            is.close();
            httpURLConnection.disconnect();
            System.out.println("data data :: " + data);
            return data;


        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("data data :: " + data);
        return data;
    }

<?php
require "dbcon.php";
if(!empty($_POST['username']) && !empty($_POST['password'])){
$username = $_POST['username'];
$password = $_POST['password'];

$query = "SELECT forename, surname FROM users WHERE username = '$username' AND password = '$password' ";

$result = mysqli_query($conn, $query);

while($row = mysqli_fetch_assoc($result)){
    $response[] = $row;
}

if(!empty($response)){
    echo json_encode(array("final"=>$response));
}
else{
    echo "No records found ";
}
}
else{
    echo "This file does not work";
}

?>

HttpPost postRequest = new HttpPost(params[0]);
        List<NameValuePair> postBody = new ArrayList<NameValuePair>(); // These are your post parameters
        postBody.add(new BasicNameValuePair("parameter1", "value");
        postBody.add(new BasicNameValuePair("parameter2", "value"));
        try {
            postRequest.setEntity(new UrlEncodedFormEntity(postBody));
            HttpResponse response = new DefaultHttpClient().execute(postRequest);

            Log.i(TAG, "Got response: " + EntityUtils.toString(response.getEntity()));
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        return null;