public BottomNavigationBar setBarBackgroundColor(String backgroundColorCode) {
        this.mBackgroundColor = Color.parseColor(backgroundColorCode);
        return this;
    }
@param backgroundColorCode color code in string format for the default background color
@return this, to allow builder pattern
common/src/main/java/com/sxjs/common/widget/bottomnavigation/BottomNavigationBar.java