Android ImageButton -- can't get image in the center

Question

Good day house. This is the second time I got locked out of the web application I am working on. It's still being developed on my localhost (laptop) using PHP and MySQL. Please what could be responsible for this? I have been on the project for some months now but got locked out now within the space of 2 weeks. No new plugin or third party stuff. What exactly could be responsible for this? The only thing that has changed is my PHP version(the previous and current is still PHP7, just a minor upgrade). What should I look out for?

I have few other users who can log in and few who can't just like me, so the problem is not with the login code. I have been login in and out before being shut out suddenly with no apparent reason while others can still login. It's not a code problem I guess.

Here is my login code

require_once '../classes/DbManager.php';

$error = array();

if (isset($_POST['action']) && $_POST['action'] == 'login') 
{
   //Validate/Sanitize the user input
   $username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
   $password = filter_var($_POST['password'], FILTER_SANITIZE_STRING);
   
   if(empty($username))
   {
       $error[] = 'The username field cannot be left empty';
   }
   
   if(empty($password))
   {
       $error[] = 'The password field cannot be left empty';
   }
   
   if(empty($error))
   {
      // start the session
      session_start(); 
      
        // connect to the database
        $conn = DbManager::getConnection();
        //Get the hash from the database
        try{
        $sql = "SELECT hash FROM users WHERE username = :username";

        $st = $conn->prepare($sql);
        // bind variables when executing statement
        $st->bindValue(':username', $username);
        $st->execute();
        }
        catch (PDOException $e)
        {
        $error[] = 'Invalid username or password.';
        }
        // if a match is found, rowCount() produces 1, which is treated as true
        
       if($st->rowCount() == 1) 
        { 
            $row = $st->fetch();
            $hash = $row['hash'];
        }
        
        // connect to the database
        $conn = DbManager::getConnection();
        //Now connect to log the user in
        try{
        $sql = "SELECT username FROM users WHERE username = :username AND password = AES_ENCRYPT(:password, :hash)";

        $stmt = $conn->prepare($sql);
        // bind variables when executing statement
        $stmt->bindValue(':username', $username);
        $stmt->bindValue(':password', $password);
        $stmt->bindValue(':hash', $hash);
        $stmt->execute();
        }
        catch (PDOException $e)
        {
        $error[] = 'Invalid username or password.';
        }
        // if a match is found, rowCount() produces 1, which is treated as true
        
        
       if($stmt->rowCount() == 1) 
        { 
            $row = $stmt->fetch();
            $username = $row['username'];
           
        $_SESSION['loggedIn'] = TRUE;
        $_SESSION['username'] = $username;
        
        session_regenerate_id(true);
        }

        // if no match, destroy the session and prepare error message
        else {
        $_SESSION = array();
        session_destroy();
        $error[] = 'Invalid username or password.';
        }
        
        
        // if the session variable has been set, redirect
        if (isset($_SESSION['loggedIn'])) {
        // get the time the session started
        $_SESSION['start'] = time();

        $login = TRUE;

        header('Location: ../my-account/');
        exit();
        }
        else
        {
    header('Location: .');
    }
   }
   
}

Solution 1

I'm a real moron. That's how it appears in the display the Ecliplse plugin provide side-by-side with the XML editor. When I actually build the project and ran it on a device, it displayed everything correctly.

Solution 2

Ironically I had exactly the opposite problem with an ImageView - I couldn't get it left-aligned no matter what I tried. In this case I was using layout_width="fill_parent".

See my question here: Android layout - alignment issue with ImageView