Hi, in my research for the purpose to write an app that is always running, even when it is not in the foreground, I found this version of the app inventor.
http://services.appinventor.mit.edu/#5715722810425344
Doesn’t allow you to fill in, does anyone know it?
Services has been abandoned. 
What you can do is use a Stay Awake routine.
The best you can do is prevent the screen from closing using a Stay Awake routine .
Either use a Stay Awake block routine using a Notifier
or you use Taifun’s Tools Extension: https://puravidaapps.com/tools.php
Be aware using either an extension or a block routine drains your device battery rapidly . These work around methods are not running the app in the Background, they force the app screen to stay open.
thank you very much
because, as @SteveJG already mentioned
Google has taken Android in a direction that makes the approach to services taken here unworkable.
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.
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