title: Android - ID unique to the installation of an app
body: <p>Is there an ID available that is unique to the installation of an app?  </p>
  
  <p>Unique across devices I mean, so if the same app is installed on 10 different devices then there are 10 different ids.  And two different apps on the same device must give two different IDs.</p>
  
  <p>Needs to remain constant following app updates and would ideally change if you uninstalled and reinstalled the app.</p>
  
  <p>And for security reasons I don't want to generate a UUID and write it to a file in app-private storage.</p>