title: Android push notification without firebase
body: <p>I want to <strong>send android</strong> push notification to the selected user <strong>without using</strong> gcm or firebase. The application is already built without firebase. Now I need to integrate push notification too.</p>
  
  <p>Question:</p>
  
  <ul>
  <li>How it's possible without firebase? </li>
  </ul>
  
  <p>Actually I want a feature that, when an admin update the value in the one field in database table of particular user, the that user will get a push notification regarding the update. How it is possible?</p>