The app makes use of the accessibility service to provide quick settings tiles to perform global actions: screenshot (API level 28), sleep (API level 28) and system power dialog (API level 21).
System power dialog (GLOBAL_ACTION_POWER_DIALOG) has been added in API level 21.
Sleep (GLOBAL_ACTION_LOCK_SCREEN) has been added in API level 28
Screenshot (GLOBAL_ACTION_TAKE_SCREENSHOT) has been added in API level 28.
Android Developers Documentation
- Accessibility service
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