如何在android中创建年龄计算方法

Question

我想写一个方法来计算出生日期的年龄,逻辑是否正确以及如何在android Java中编写它:

public int calculateAge(String birthday){ 
 // consider that birthday format is ddmmyyyy;

 String today = SystemDate(ddmmyyyy);
 int bDay = birthday(1,2).toInteger;
 int bMonth = birthday(3,4).toInteger;
 int bYear = birhtday(5,8).toInteger;

 int tDay = today(1,2).toInteger;
 int tMonth = today(3,4).toInteger;
 int tYear = today(5,8).toInteger;

 if (tMonth == bMonth){
     if (tday>= bDay){ 
        age = tYear - bYear;
      else 
        age = tYear - bYear - 1;}
 else
   if (tMonth > bMonth) {
       age = tYear - bYear;
   else 
       age = tYear - bYear - 1;}
 }
 return age;
}

Answer 1

这是我解决问题的方法:

/**
 * 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.
 */
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;  
}

我使用DatePicker来获取此处所需的输入值.此方法与日期选择器一起专门用于获取用户的DoB并计算其年龄.可以进行轻微修改以允许用户DoB的String输入,具体取决于您的具体实现.String的返回类型用于更新TextView,可以进行轻微的mod以允许类型int输出.

Answer 2

这完美适用.....

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 3

以下是您应该能够使用的Android年龄计算示例:

    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;
    }