从BirthDate计算年龄 [英] Calculate age from BirthDate

问题描述

我有DatePicker对话框，当我选择当时的日期并想计算年龄时，但是当我选择当年的当前日期时显示的是-1年龄而不是0，那么如何解决呢？请帮我解决。
我的代码如下：

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;
    }

推荐答案

这是一个Java方法，称为getAge，它获取年份月份和日期的整数，并返回一个String类型，该类型持有表示年份的整数。

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;  
}

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