public int getNavigationBarWidth() {
            return mNavigationBarWidth;
        }
Get the width of the system navigation bar when it is placed vertically on the screen.

@return The nbsp;width of the navigation bar (in pixels). If the device does not have
soft navigation keys, this will always return 0.
app/src/main/java/com/zhao/myreader/util/SystemBarTintManager.java