Android orderd list style
OrderSpan用于设置Android的文本有序段落，仿照BulletSpan(无序段落)的实现。
功能演示如下图：
OrderSpan orderSpan2 = new OrderSpan(2, Color.RED, 40);
spannableString.removeSpan(orderSpan1);//移除OrderSpan1
spannableString.setSpan(orderSpan2, 0, paragraph.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);//添加OrderSpan2
mParagraph2.setText(spannableString);
OrderSpan的第一个参数表示序号，第二个参数表示序号的颜色，第三个参数表示序号与正文的距离；如果使用无参的OrderSpan，那么参数为1，颜色为黑色。
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