根据出生日期计算宝宝的年龄，几岁几个月几天！

项目需要网上找了几个工具类计算都不准确！最后发现使用Calendar计算很方便。

public static String getAge(String date) {
String[] data = date.split("-");
if (data.length < 3) return "";
Integer.valueOf(Log.d(TAG, data[0]));
Integer.valueOf(Log.d(TAG, data[1]));
Integer.valueOf(Log.d(TAG, data[2]));
Calendar birthday = new GregorianCalendar(Integer.valueOf(data[0]), Integer.valueOf(data[1]), Integer.valueOf(data[2]));
Calendar now = Calendar.getInstance();
int day = now.get(Calendar.DAY_OF_MONTH) - birthday.get(Calendar.DAY_OF_MONTH);
int month = now.get(Calendar.MONTH) + 1 - birthday.get(Calendar.MONTH);
int year = now.get(Calendar.YEAR) - birthday.get(Calendar.YEAR);
//按照减法原理，先day相减，不够向month借；然后month相减，不够向year借；最后year相减。
if (day < 0) {
month -= 1;
now.add(Calendar.MONTH, -1);//得到上一个月，用来得到上个月的天数。
day = day + now.getActualMaximum(Calendar.DAY_OF_MONTH);
}
if (month < 0) {
month = (month + 12) % 12;
year--;
}
System.out.println("年龄：" + year + "岁" + month + "月" + day + "天");
StringBuffer tag = new StringBuffer();
if (year > 0) {
tag.append(year + "岁");
}
if (month > 0) {
tag.append(month + "个月");
}
if (day > 0) {
tag.append(day + "天");
}
if (year == 0 && month == 0 && day == 0) {
tag.append("今日出生");
}
return String.valueOf(tag);
}