public BottomNavigationBar setBarBackgroundColor(@ColorRes int backgroundColor) {
        this.mBackgroundColor = ContextCompat.getColor(getContext(), backgroundColor);
        return this;
    }
@param backgroundColor res code for the default background color
@return this, to allow builder pattern
common/src/main/java/com/sxjs/common/widget/bottomnavigation/BottomNavigationBar.java