Soft-key of the back button. I work does not require root. The Floating Button and the Navigation Bar are displayed. The home button and the notification bar can be displayed. The displayed button can be selected. The Button or Widget can move in long push. - The Navigation Bar is not supported in Hard-Navigation Bar(Galaxy etc.) and Android4.4 or later.- Don't react to the tap of a widget. - Widget supports operation only a "Clock&Battery" In order to use it, please turn ON "Back Button" service from "setting -> Accessibility Option." Android4.4 without the navigation bars.Does not try to collect the terminal data this app.[Network communication] permission not required, this app is safe.*This app uses Accessibility Services.Accessibility service is to use the functions of "Back button", "Home button", "Resents button" and "Notification bar", and it will not be used elsewhere.