How To Create Method For Age Calculation Method In Android

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 birthday){ // consider

Solution 1:

Here is my solution to the problem:

/**
 * Method to extract the user's age from the entered Date of Birth.
 * 
 * @param DoB String The user's date of birth.
 * 
 * @return ageS String The user's age in years based on the supplied DoB.
 */privateString 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 = newInteger(age);
    String ageS = ageInt.toString();

    return ageS;  
}

I used a DatePicker to get the input values required here. This method, together with the date picker, is specifically to get the user's DoB and calculate their age. A slight modification can be made to allow for String input(s) of the user's DoB, depending upon your specific implementation. The return type of String is for updating a TextView, a slight mod can be made to allow for type int output also.

Solution 2:

This works Perfectly.....

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

Solution 3:

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

publicintgetAge (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)
                    thrownew IllegalArgumentException("Age < 0");
            return a;
    }

Solution 4:

Here is the fully tested and working code

Below is an example using date picker dialog

@OverridepublicvoidonDateSet(DatePicker view, int mBirthYear, int mMonthOfYear, int mDayOfMonth) 
    {
            mAge = year - mBirthYear;

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

            Stringyears= getString(R.string.years);

            etAge.setText(mAge+years);      

    }

Solution 5:

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;
 }