How to create method for age calculation method in android

Question

I want to write a method to calculate the age from the birth date, is the logic correct and how to write it in android Java:

public int calculateAge(String b         


        

Answer 1

Here is the fully tested and working code

Below is an example using date picker dialog

@Override
    public void onDateSet(DatePicker view, int mBirthYear, int mMonthOfYear, int mDayOfMonth) 
    {
            mAge = year - mBirthYear;

            if( (mMonthOfYear == month && day < mDayOfMonth) || ( month < mMonthOfYear) ) 
            {
                mAge--;
            }

            String years = getString(R.string.years);

            etAge.setText(mAge+years);      

    }

Answer 2

None of the posted solutions worked for me. So, I worked my own logic and got this, which works 100% for me:

 Integer getAge(Integer year, Integer month, Integer 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(month == (today.get(Calendar.MONTH)+1) && day > today.get(Calendar.DAY_OF_MONTH)) {
         age--;
     }

     return age;
 }

Answer 3

This works Perfectly.....

public int getAge(int DOByear, int DOBmonth, int DOBday) {

        int age;

        final Calendar calenderToday = Calendar.getInstance();
        int currentYear = calenderToday.get(Calendar.YEAR);
        int currentMonth = 1 + calenderToday.get(Calendar.MONTH);
        int todayDay = calenderToday.get(Calendar.DAY_OF_MONTH);

        age = currentYear - DOByear;

        if(DOBmonth > currentMonth) {
            --age;
        } else if(DOBmonth == currentMonth) {
            if(DOBday > todayDay){
                --age;
            }
        }
        return age;
    }

Answer 4

Here's an example android age calculation that you should be able to work from:

    public int getAge (int _year, int _month, int _day) {

            GregorianCalendar cal = new GregorianCalendar();
            int y, m, d, a;         

            y = cal.get(Calendar.YEAR);
            m = cal.get(Calendar.MONTH);
            d = cal.get(Calendar.DAY_OF_MONTH);
            cal.set(_year, _month, _day);
            a = y - cal.get(Calendar.YEAR);
            if ((m < cal.get(Calendar.MONTH))
                            || ((m == cal.get(Calendar.MONTH)) && (d < cal
                                            .get(Calendar.DAY_OF_MONTH)))) {
                    --a;
            }
            if(a < 0)
                    throw new IllegalArgumentException("Age < 0");
            return a;
    }

Answer 5

private String getAge(int year, int month, int day){

  Calendar dob = Calendar.getInstance();

  Calendar today = Calendar.getInstance();

  dob.set(year, month, day);

  today.set(today.get(Calendar.YEAR), today.get(Calendar.MONTH) + 1,
    today.get(Calendar.DATE));

  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;
}

Answer 6

The below will provide you age in the most accurate way possible

public static String getAgeFromLong(String birthday) {

    SimpleDateFormat sdf= new SimpleDateFormat("ddMMyyyy",Locale.ENGLISH);
    Calendar dobCal=Calendar.getInstance();
    dobCal.setTime(sdf.parse(birthday));

    Calendar diffCal = Calendar.getInstance();
    diffCal.setTimeInMillis(Calendar.getInstance().getTimeInMillis() - dobCal.getInstance().getTimeInMillis());

    String ageS = "";

    int age = diffCal.get(Calendar.YEAR) - 1970;
    //Check if less than a year
    if (age == 0) {
        age = diffCal.get(Calendar.MONTH);
        //Check if less than a month
        if (age == 0) {
            age = diffCal.get(Calendar.WEEK_OF_YEAR);
            //Check if less than a week
            if (age == 1) {
                age = diffCal.get(Calendar.DAY_OF_YEAR);
                ageS = (age - 1) + " Days";
            } else {
                ageS = (age - 1) + " Weeks";
            }
        } else {
            ageS = age + " Months";
        }
    } else {
        ageS = age + " Years";
    }

    return ageS;
}