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 StringgetAge(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);
//月份从0开始计算，所以需要+1
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);
}
