android计算据当前时间的天数和年龄

计算天数：public static int daysBetween(String bdate) throws ParseException{

SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");

Calendar cal = Calendar.getInstance();

cal.setTime(sdf.parse(sdf.format(new Date())));

long time1 = cal.getTimeInMillis();

cal.setTime(sdf.parse(bdate));

long time2 = cal.getTimeInMillis();

long between_days=(time1-time2)/(1000*3600*24);

return Integer.parseInt(String.valueOf(between_days));

}

计算年龄：public static String getAgeByBirth(String birth) {

Date birthDay = null;

if (birth == null) {

return "";

}

SimpleDateFormat format = null;

if (birth.contains("/")) {

format = new SimpleDateFormat("yyyy/MM/dd", Locale.CHINA);

} else {

format = new SimpleDateFormat("yyyy-MM-dd", Locale.CHINA);

}

try {

birthDay = format.parse(birth);

} catch (ParseException e) {

e.printStackTrace();

return "";

}

Calendar cal = Calendar.getInstance();

if (cal.before(birthDay)) {

throw new IllegalArgumentException(

"The birthDay is before Now.It's unbelievable!");

}

int yearNow = cal.get(Calendar.YEAR);

int monthNow = cal.get(Calendar.MONTH);

int dayOfMonthNow = cal.get(Calendar.DAY_OF_MONTH);

cal.setTime(birthDay);

int yearBirth = cal.get(Calendar.YEAR);

int monthBirth = cal.get(Calendar.MONTH);

int dayOfMonthBirth = cal.get(Calendar.DAY_OF_MONTH);

int age = yearNow - yearBirth;

if (monthNow <= monthBirth) {

if (monthNow == monthBirth) {

// monthNow==monthBirth

if (dayOfMonthNow < dayOfMonthBirth) {

age--;

} else {

// do nothing

}

} else {

// monthNow>monthBirth

age--;

}

} else {

// monthNow<monthBirth

// donothing

}

return age + "";

}