public BaseViewHolder setBackgroundRes(int viewId, @DrawableRes int backgroundRes) {
        View view = getView(viewId);
        view.setBackgroundResource(backgroundRes);
        return this;
    }
Will set background of a view.

@param viewId        The view id.
@param backgroundRes A resource to use as a background.
@return The BaseViewHolder for chaining.
common/src/main/java/com/sxjs/common/base/baseadapter/BaseViewHolder.java