title: Firebase registration token not generate android
body: <p>I want to integrate Firebase Push Notification in my app so I set below code for that. I integrated the following code for notification:</p>
  
  <p><a href="http://www.androidhive.info/2012/10/android-push-notifications-using-google-cloud-messaging-gcm-php-and-mysql/" rel="nofollow noreferrer">http://www.androidhive.info/2012/10/android-push-notifications-using-google-cloud-messaging-gcm-php-and-mysql/</a></p>
  
  <p>When I run it with my credentials and API key I am getting Firebase reg id blank every time. Any idea how can I solve this?</p>