问题
I have DatePicker Dialog, When I select date at that time I want to calculate age it's working but when I select date of current year at that time it showing the -1 age instead of 0 then how can solve this? Please help me to solve it. My code is below:
public int getAge(int year, int month, int day) {
GregorianCalendar cal = new GregorianCalendar();
int y, m, d, noofyears;
y = cal.get(Calendar.YEAR);// current year ,
m = cal.get(Calendar.MONTH);// current month
d = cal.get(Calendar.DAY_OF_MONTH);// current day
cal.set(year, month, day);// here ur date
noofyears = (int) (y - cal.get(Calendar.YEAR));
LOGD("Age......", String.valueOf(noofyears));
if ((m < cal.get(Calendar.MONTH)) || ((m == cal.get(Calendar.MONTH)) && (d < cal.get(Calendar.DAY_OF_MONTH)))) {
--noofyears;
}
LOGD("Age......", String.valueOf(noofyears));
if (noofyears != 0) {
ageCount = noofyears;
} else {
ageCount = 0;
}
if (noofyears < 0)
throw new IllegalArgumentException("age < 0");
return noofyears;
}
回答1:
Here is a Java method called getAge which takes integers for year month and day and returns a String type which holds an integer that represents age in years.
private String getAge(int year, int month, int day){
Calendar dob = Calendar.getInstance();
Calendar today = Calendar.getInstance();
dob.set(year, month, day);
int age = today.get(Calendar.YEAR) - dob.get(Calendar.YEAR);
if (today.get(Calendar.DAY_OF_YEAR) < dob.get(Calendar.DAY_OF_YEAR)){
age--;
}
Integer ageInt = new Integer(age);
String ageS = ageInt.toString();
return ageS;
}
回答2:
private int getAge(String dobString){
Date date = null;
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
try {
date = sdf.parse(dobString);
} catch (ParseException e) {
e.printStackTrace();
}
if(date == null) return 0;
Calendar dob = Calendar.getInstance();
Calendar today = Calendar.getInstance();
dob.setTime(date);
int year = dob.get(Calendar.YEAR);
int month = dob.get(Calendar.MONTH);
int day = dob.get(Calendar.DAY_OF_MONTH);
dob.set(year, month+1, day);
int age = today.get(Calendar.YEAR) - dob.get(Calendar.YEAR);
if (today.get(Calendar.DAY_OF_YEAR) < dob.get(Calendar.DAY_OF_YEAR)){
age--;
}
return age;
}
回答3:
private void calculateAge() {
age.calcualteYear();
age.calcualteMonth();
age.calcualteDay();
age.calculateMonths();
age.calTotalWeeks();
age.calTotalHours();
age.calTotalMins();
age.calTotalSecs();
age.calTotalMilsecs();
// Toast.makeText(getContext(), "click the resulted button"+age.getResult() , Toast.LENGTH_SHORT).show();
result.setText("AGE (DD/MM/YY) :" + age.getResult());
}
after that create one class
public class AgeCalculation {
private int startYear;
private int startMonth;
private int startDay;
private int endYear;
private int endMonth;
private int endDay;
private int resYear;
private int resMonth;
private int resDay;
private Calendar start;
private Calendar end;
public String getCurrentDate()
{
end=Calendar.getInstance();
endYear=end.get(Calendar.YEAR);
endMonth=end.get(Calendar.MONTH);
endMonth++;
endDay=end.get(Calendar.DAY_OF_MONTH);
return endDay+":"+endMonth+":"+endYear;
}
public void setDateOfBirth(int sYear, int sMonth, int sDay)
{
startYear=sYear;
startMonth=sMonth;
startDay=sDay;
}
public void calcualteYear()
{
resYear=endYear-startYear/(365);
}
public void calcualteMonth()
{
if(endMonth>=startMonth)
{
resMonth= endMonth-startMonth;
}
else
{
resMonth=endMonth-startMonth;
resMonth=12+resMonth;
resYear--;
}
}
public void calcualteDay()
{
if(endDay>=startDay)
{
resDay= endDay-startDay;
}
else
{
resDay=endDay-startDay;
resDay=30+resDay;
if(resMonth==0)
{
resMonth=11;
resYear--;
}
else
{
resMonth--;
}
}
}
public String getResult()
{
return resDay+":"+resMonth+":"+resYear;
}
回答4:
private boolean getAge(int year, int month, int day) {
try {
Calendar dob = Calendar.getInstance();
Calendar today = Calendar.getInstance();
dob.set(year, month, day);
int monthToday = today.get(Calendar.MONTH) + 1;
int monthDOB = dob.get(Calendar.MONTH)+1;
int age = today.get(Calendar.YEAR) - dob.get(Calendar.YEAR);
if (age > 18) {
return true;
} else if (age == 18) {
if (monthDOB > monthToday) {
return true;
} else if (monthDOB == monthToday) {
int todayDate = today.get(Calendar.DAY_OF_MONTH);
int dobDate = dob.get(Calendar.DAY_OF_MONTH);
if (dobDate <= todayDate) { // should be less then
return true;
} else {
return false;
}
} else {
return false;
}
} else {
return false;
}
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
回答5:
Now for kotlin Language:
import java.util.Calendar
fun main(args: Array<String>) {
print(getAge(yyyy,mm,dd))
}
fun getAge(year: Int, month: Int, day: Int): String {
val dob = Calendar.getInstance()
val today = Calendar.getInstance()
dob.set(year, month, day)
var age = today.get(Calendar.YEAR) - dob.get(Calendar.YEAR)
if (today.get(Calendar.DAY_OF_YEAR) < dob.get(Calendar.DAY_OF_YEAR)) {
age--
}
val ageInt = age + 1
return ageInt.toString()
}
回答6:
Here is a Kotlin extension of the Date class returning the age corresponding to a Date object
val Date.age: Int
get() {
val calendar = Calendar.getInstance()
calendar.time = Date(time - Date().time)
return 1970 - (calendar.get(Calendar.YEAR) + 1)
}
It is compatible for all Android versions. If you wonder what '1970' is, that's the Unix Epoch. The timestamp is 0 on January 1, 1970.
回答7:
java.time
For the sage of completeness and being up-to-date concerning packages, here is the way using java.time (Java 8+).
Java
public int getAge(int year, int month, int dayOfMonth) {
return Period.between(
LocalDate.of(year, month, dayOfMonth),
LocalDate.now()
).getYears();
}
Kotlin
fun getAge(year: Int, month: Int, dayOfMonth: Int): Int {
return Period.between(
LocalDate.of(year, month, dayOfMonth),
LocalDate.now()
).getYears()
}
Both snippets need the following imports from java.time:
import java.time.LocalDate;
import java.time.Period
It's not recommended to use java.util.Date and java.util.Calendar anymore except from situations where you have to involve considerably large amounts of legacy code.
See also Oracle Tutorial.
For projects supporting Java 6 or 7, this functionality is available via the ThreeTenBP,
while there is special version, the ThreeTenABP for API levels below 26 in Android.
回答8:
public String getAge(int year, int month, int day) {
Calendar dob = Calendar.getInstance();
Calendar today = Calendar.getInstance();
dob.set(year, month-1, day);
int age = today.get(Calendar.YEAR) - dob.get(Calendar.YEAR);
if (today.get(Calendar.DAY_OF_YEAR) < dob.get(Calendar.DAY_OF_YEAR)) {
age--;
}
Integer ageInt = new Integer(age);
String ageS = ageInt.toString();
return ageS;
}
回答9:
public static String calculateAge(String strDate) {
int years = 0;
int months = 0;
int days = 0;
try {
long timeInMillis = Long.parseLong(strDate);
Date birthDate = new Date(timeInMillis);
//create calendar object for birth day
Calendar birthDay = Calendar.getInstance();
birthDay.setTimeInMillis(birthDate.getTime());
//create calendar object for current day
long currentTime = System.currentTimeMillis();
Calendar now = Calendar.getInstance();
now.setTimeInMillis(currentTime);
//Get difference between years
years = now.get(Calendar.YEAR) - birthDay.get(Calendar.YEAR);
int currMonth = now.get(Calendar.MONTH) + 1;
int birthMonth = birthDay.get(Calendar.MONTH) + 1;
//Get difference between months
months = currMonth - birthMonth;
//if month difference is in negative then reduce years by one and calculate the number of months.
if (months < 0) {
years--;
months = 12 - birthMonth + currMonth;
if (now.get(Calendar.DATE) < birthDay.get(Calendar.DATE))
months--;
} else if (months == 0 && now.get(Calendar.DATE) < birthDay.get(Calendar.DATE)) {
years--;
months = 11;
}
//Calculate the days
if (now.get(Calendar.DATE) > birthDay.get(Calendar.DATE))
days = now.get(Calendar.DATE) - birthDay.get(Calendar.DATE);
else if (now.get(Calendar.DATE) < birthDay.get(Calendar.DATE)) {
int today = now.get(Calendar.DAY_OF_MONTH);
now.add(Calendar.MONTH, -1);
days = now.getActualMaximum(Calendar.DAY_OF_MONTH) - birthDay.get(Calendar.DAY_OF_MONTH) + today;
} else {
days = 0;
if (months == 12) {
years++;
months = 0;
}
}
//adarsh
if (currMonth > birthMonth) {
if (birthDay.get(Calendar.DATE) > now.get(Calendar.DATE)) {
months = months - 1;
}
}//---------------------------------
} catch (Exception e) {
e.printStackTrace();
}
//Create new Age object
return years + " Y " + months + " M " + days + " days";
}
回答10:
static int calculateAge(int birthdayDay, int birthdayMonth, int birthdayYear)
{
DateTime date = DateTime(birthdayYear, birthdayMonth, birthdayDay).toLocal();
DateTime now = DateTime.now().toLocal();
return now.difference(date).inDays ~/ 365.2425;
}
回答11:
public int getAge(int year, int month, int day) {
final Calendar birthDay = Calendar.getInstance();
birthDay.set(year, month, day);
final Calendar current = Calendar.getInstance();
if (current.getTimeInMillis() < birthDay.getTimeInMillis())
throw new IllegalArgumentException("age < 0");
int age = current.get(Calendar.YEAR) - birthDay.get(Calendar.YEAR);
if (birthDay.get(Calendar.MONTH) > current.get(Calendar.MONTH) ||
(birthDay.get(Calendar.MONTH) == current.get(Calendar.MONTH) &&
birthDay.get(Calendar.DATE) > current.get(Calendar.DATE)))
age--;
return age;
}
回答12:
This is how I implement in my source code, I tested. Hope that it is useful :
public static int getAge(String dateTime, String currentFormat) {
SimpleDateFormat dateFormat = new SimpleDateFormat(currentFormat);
try {
Date date = dateFormat.parse(dateTime);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int day = calendar.get(Calendar.DAY_OF_MONTH);
Date currentDate = new Date();
Calendar currentCalendar = Calendar.getInstance();
currentCalendar.setTime(currentDate);
int currentYear = currentCalendar.get(Calendar.YEAR);
int currentMonth = currentCalendar.get(Calendar.MONTH);
int currentDay = currentCalendar.get(Calendar.DAY_OF_MONTH);
int deltaYear = currentYear - year;
int deltaMonth = currentMonth - month;
int deltaDay = currentDay - day;
if (deltaYear > 0) {
if (deltaMonth < 0) {
deltaYear --;
} else if (deltaDay < 0){
deltaYear --;
}
return deltaYear;
}
} catch (java.text.ParseException e) {
e.printStackTrace();
}
return 0;
}
回答13:
String getAgeInOther(int year, int month, int day) {
Calendar today = Calendar.getInstance();
Calendar birth = Calendar.getInstance();
birth.set(year, month, day);
Calendar temp = Calendar.getInstance();
temp.set(year, month, day);
int totalDays = 0;
int intMonth=0,intDays=0;
for (int iYear = birth.get(Calendar.YEAR); iYear <= today.get(Calendar.YEAR); iYear++) {
if (iYear == today.get(Calendar.YEAR) && iYear == birth.get(Calendar.YEAR)) {
for (int iMonth = birth.get(Calendar.MONTH); iMonth <= today.get(Calendar.MONTH); iMonth++) {
temp.set(iYear, iMonth, 1);
if ((iMonth == today.get(Calendar.MONTH)) && (iMonth == birth.get(Calendar.MONTH))) {
totalDays += today.get(Calendar.DAY_OF_MONTH) - birth.get(Calendar.DAY_OF_MONTH);
} else if ((iMonth != today.get(Calendar.MONTH)) && (iMonth != birth.get(Calendar.MONTH))) {
totalDays += temp.getActualMaximum(Calendar.DAY_OF_MONTH);
intMonth++;
}else if ((iMonth == birth.get(Calendar.MONTH))) {
totalDays +=( birth.getActualMaximum(Calendar.DAY_OF_MONTH)- birth.get(Calendar.DAY_OF_MONTH));
} else if ((iMonth == today.get(Calendar.MONTH))){
totalDays += today.get(Calendar.DAY_OF_MONTH);
if (birth.get(Calendar.DAY_OF_MONTH)<today.get(Calendar.DAY_OF_MONTH))
{
intMonth++;
intDays=today.get(Calendar.DAY_OF_MONTH)-birth.get(Calendar.DAY_OF_MONTH);
}else {
temp.set(today.get(Calendar.YEAR),today.get(Calendar.MONTH)-1,1);
intDays=temp.getActualMaximum(Calendar.DAY_OF_MONTH)-birth.get(Calendar.DAY_OF_MONTH)+today.get(Calendar.DAY_OF_MONTH);
}
}
}
} else if ((iYear != today.get(Calendar.YEAR)) && (iYear != birth.get(Calendar.YEAR))) {
for (int iMonth = 0; iMonth < 12; iMonth++) {
temp.set(iYear, iMonth, 1);
totalDays += temp.getActualMaximum(Calendar.DAY_OF_MONTH);
intMonth++;
}
} else if (((iYear) == birth.get(Calendar.YEAR))) {
for (int iMonth = birth.get(Calendar.MONTH); iMonth < 12; iMonth++) {
temp.set(iYear, iMonth, 1);
if ((iMonth == birth.get(Calendar.MONTH))) {
totalDays += (birth.getActualMaximum(Calendar.DAY_OF_MONTH)-birth.get(Calendar.DAY_OF_MONTH));
} else {
intMonth++;
totalDays += temp.getActualMaximum(Calendar.DAY_OF_MONTH);
}
}
} else if (iYear == today.get(Calendar.YEAR)) {
for (int iMonth = 0; iMonth <= today.get(Calendar.MONTH); iMonth++) {
temp.set(iYear, iMonth, 1);
if ((iMonth == today.get(Calendar.MONTH))) {
totalDays += today.get(Calendar.DAY_OF_MONTH);
if (birth.get(Calendar.DAY_OF_MONTH)<today.get(Calendar.DAY_OF_MONTH))
{
intMonth++;
intDays=today.get(Calendar.DAY_OF_MONTH)-birth.get(Calendar.DAY_OF_MONTH);
}else {
temp.set(today.get(Calendar.YEAR),today.get(Calendar.MONTH)-1,1);
intDays=temp.getActualMaximum(Calendar.DAY_OF_MONTH)-birth.get(Calendar.DAY_OF_MONTH)+today.get(Calendar.DAY_OF_MONTH);
}
} else {
intMonth++;
totalDays += temp.getActualMaximum(Calendar.DAY_OF_MONTH);
}
}
}
}
int ageYear=intMonth/12;
int ageMonth=intMonth%12;
int ageDays=intDays;
//TODO if you want age in YEAR:MONTH:DAY REMOVE COMMENTS
//TODO return ageYear+":"+ageMonth+":"+ageDays;
return ""+totalDays;//todo TOTAL AGE IN DAYS
}
来源：https://stackoverflow.com/questions/38967422/calculate-age-from-birthdate