title: Configure firebase to use java package instead of application ID
body: <p>I have two apps that use this same id, one is android mobile, on android tv. They need to have this same id, because of google play store, so I can not give them a different application ID on firebase. </p>
  
  <p>Is there some way that firebase can be configured to use java package instead of applicationId from build.gradle?</p>
  
  <p>Or is there another way to solve this, without changing applicationID in build.gradle?</p>