Используйте приложение APKPure
Историческую версию Floating buttons [ROOT] можно получить на Android
Плавающие кнопки, как и в Samsung Galaxy Note 4
This app needs root to fake soft keys clicks.
Feratures:
* overlay on top of all screens
* fake back, home, recents, menu button clicks
* change floating buttons position by draging while holding on pin icon
* minimize floating buttons by clicking on pin icon