下载 APKPure App
可在安卓获取Soft Keys - More Settings的历史版本
激活屏幕上的按键，尽情享受吧！不需要根。
Activate the on-screen keys, enjoy it! Don't need root.
simple and easy to use version here :
https://play.google.com/store/apps/details?id=com.dogusumit.softkeys2
source codes here :
https://github.com/dogusumit/SoftKeys-MoreSettings
This app uses Accessibility services.