El inicio de sesión de Android con el objeto json está vacío en la búsqueda incluso si la ejecución de archivos php en el navegador Chrome está bien

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public class fetchUserDataAsyncTask extends AsyncTask<Void, Void, User> { User user; GetUserCallback userCallBack; public fetchUserDataAsyncTask(User user, GetUserCallback userCallBack) { this.user = user; this.userCallBack = userCallBack; } @Override protected User doInBackground(Void... params) { ArrayList<NameValuePair> dataToSend = new ArrayList<>(); dataToSend.add(new BasicNameValuePair("username", user.username)); dataToSend.add(new BasicNameValuePair("password", user.password)); HttpParams httpRequestParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpRequestParams, CONNECTION_TIMEOUT); HttpConnectionParams.setSoTimeout(httpRequestParams, CONNECTION_TIMEOUT); HttpClient client = new DefaultHttpClient(httpRequestParams); HttpPost post = new HttpPost(SERVER_ADDRESS + "FetchUserData.php"); User returnedUser = null; try { post.setEntity(new UrlEncodedFormEntity(dataToSend)); HttpResponse httpResponse = client.execute(post); HttpEntity entity = httpResponse.getEntity(); String result = EntityUtils.toString(entity); JSONObject jObject = new JSONObject(result); if (jObject.length() != 0){ Log.v("happened", "2"); String name = jObject.getString("name"); int age = jObject.getInt("age"); returnedUser = new User(name, age, user.username, user.password); } } catch (Exception e) { e.printStackTrace(); } return returnedUser; } @Override protected void onPostExecute(User returnedUser) { super.onPostExecute(returnedUser); progressDialog.dismiss(); userCallBack.done(returnedUser); } } 

Php buscar el archivo Fetch_User_Data.php

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 <?php $con=mysqli_connect("localhost","root","","loginregister"); if (mysqli_connect_errno($con)) { echo "Failed to connect to MySQL: " , mysqli_connect_error(); } if (isset($_POST["password"])) {$password = $_POST ["password"];}else $password = 'bimbomix'; if (isset($_POST["username"])) {$username = $_POST ["username"];}else $username = 'bimbomix'; $statement = mysqli_prepare($con, "SELECT * FROM user WHERE username = ? AND password = ?"); mysqli_stmt_bind_param($statement, "ss", $username, $password); mysqli_stmt_execute($statement); mysqli_stmt_store_result($statement); mysqli_stmt_bind_result($statement, $user_id, $name, $age, $username, $password); $user = array(); while(mysqli_stmt_fetch($statement)){ $user['name'] = $name; $user['age'] = $age; $user['username'] = $username; $user['password']= $password; } echo json_encode($user); mysqli_close($con); ?> 

Prueba Hardcoding

  User returnedUser=null; try { post.setEntity(new UrlEncodedFormEntity(dataToSend)); HttpResponse httpResponse = client.execute(post); HttpEntity entity = httpResponse.getEntity(); String result = EntityUtils.toString(entity); //until here hardcoding fills correctly returnedUser JSONObject jObject = new JSONObject(result); returnedUser = new User("hello", 42, user.username, user.password); // this is hardcoded string that let returnedUser ==null // so perhaps problem is in jObject if (jObject.length() != 0){ Log.v("happened", "2"); String name = jObject.getString("name"); int age = jObject.getInt("age"); // returnedUser = new User(name, age, user.username, user.password); } } catch (Exception e) { e.printStackTrace(); } return returnedUser; }