Question

Android学习之计算2个日期之间有多少年月日

若以下回答无法解决问题，邀请你更新回答

Answer 1

话不多说，上代码：
private void getAge(String birthday, String time, TextView tvAgeYear, TextView tvAgeMonth, TextView tvAgeDay) {
SimpleDateFormat formatBirthday = new SimpleDateFormat("yyyy-MM-dd", Locale.getDefault());
int yearBirthday = 0, monthBirthday = 0, dayBirthday = 0;
try {
Date dateBirthday = formatBirthday.parse(birthday);
Calendar calendarBirthday = Calendar.getInstance();
calendarBirthday.setTime(dateBirthday);
yearBirthday = calendarBirthday.get(Calendar.YEAR);
monthBirthday = calendarBirthday.get(Calendar.MONTH);
dayBirthday = calendarBirthday.get(Calendar.DAY_OF_MONTH);
} catch (ParseException e) {
e.printStackTrace();
}
SimpleDateFormat formatMoment = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
Calendar calendarMoment = Calendar.getInstance();
int yearMoment = 0, monthMoment = 0, dayMoment = 0;
try {
Date dateMoment = formatMoment.parse(time);
calendarMoment.setTime(dateMoment);
yearMoment = calendarMoment.get(Calendar.YEAR);
monthMoment = calendarMoment.get(Calendar.MONTH);
dayMoment = calendarMoment.get(Calendar.DAY_OF_MONTH);
} catch (ParseException e) {
e.printStackTrace();
}
if (yearBirthday > yearMoment || yearBirthday == yearMoment && monthBirthday > monthMoment || yearBirthday == yearMoment && monthBirthday == monthMoment && dayBirthday > dayMoment) {
tvAgeYear.setText("??年");
tvAgeMonth.setText("??月");
tvAgeDay.setText("??天");
} else {
int yearAge = yearMoment - yearBirthday;
int monthAge = monthMoment - monthBirthday;
int dayAge = dayMoment - dayBirthday;
//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 (dayAge < 0) {
monthAge -= 1;
calendarMoment.add(Calendar.MONTH, -1);//得到上一个月，用来得到上个月的天数
dayAge = dayAge + calendarMoment.getActualMaximum(Calendar.DAY_OF_MONTH);
}
if (monthAge < 0) {
monthAge = (monthAge + 12) % 12;
yearAge--;
}
String year, month, day;
if (yearAge < 10) {
year = "0" + yearAge + "年";
} else {
year = yearAge + "年";
}
if (monthAge < 10) {
month = "0" + monthAge + "月";
} else {
month = monthAge + "月";
}
if (dayAge < 10) {
day = "0" + dayAge + "天";
} else {
day = dayAge + "天";
}
tvAgeYear.setText(year);
tvAgeMonth.setText(month);
tvAgeDay.setText(day);
}
}