Glide4 加载失败时显示默认图片

// 根据URL的首字母创建一个DRAWABLE
TextDrawable drawable = TextDrawable.builder()
        .buildRoundRect(getUrlFirstLetter(item.getUrl()), getRandomColor(item.getUrl()), 10);
viewHolder.ivLogo.setImageDrawable(drawable);
// 当从网络加载失败时，显示这张DRAWABLE
RequestOptions options = new RequestOptions().placeholder(drawable);
Glide.with(context).load(getFaviconUrl(item.getUrl())).apply(options).into(viewHolder.ivLogo);