用textView实现放大首个字符

String txt = "1/2344555556677";

//创建对象SpannableString textSpan = new SpannableString (txt);

//设置首个字符的字体大小textSpan.setSpan(new AbsoluteSizeSpan(100),0,1, Spannable.SPAN_INCLUSIVE_INCLUSIVE);

//用textView展示出来holder.recipe_desc.setText(textSpan);