This can be a problem for app developers of all kinds as they must be aware of every user. This is why the Android 8 task manager apps work with all phones running the latest versions of the OS. However, that doesn’t mean that previous and future versions shouldn’t be ignored. Also: App Developers London
https://medium.com/@ijaz.khan/5-points-you-should-know-to-develop-android-task-monitoring-application-ea6d5f7d8ec6