codeigniter random databse row to android string

I have a website built with codeigniter that picks a random row from my "facts" table. I want to build a android app that simply displays this random fact, with a button to refresh/get a new fact. I am new to android/API builing so i don't know anything about it. Can anyone help me?

ffotd_model.php:

 function getrandom_facts()
 {
  $this->db->order_by('id', 'RANDOM');
    $this->db->limit(1);
    $query = $this->db->get('facts');
        return $result = $query->result();
 }

Controller ffotd.php:

public function index()
    {
        $data   = array();
        $this->load->helper('url');
        $this->load->view('header');
        $data['result'] = $this->ffotd_model->getrandom_facts();
        $this->load->view('ffotd.php', $data);
        $this->load->view('footer');
    }