Fiz um aplicativo que avisa sobre horário de tomar medicamentos, mas as pessoas acabam desligando ele, ao invés de minimiza-lo. Como posso deixar ele ativo, em um formato parecido como o whatsapp ou outros que parecem sempre estar ativos.
You can't do it in App Inventor because Android Background Services are required. So you will have to code it up with a different language - look at Java or Kotlin in Android Studio or B4A
you might want to try the alarm extension, which could use the built in alarm clock of your device to remind your user
https://puravidaapps.com/alarm.php
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.