如何在Android中创建年龄计算方法的方法
问题内容：
我想编写一种从出生日期开始计算年龄的方法，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;
}
问题答案：
这是我对问题的解决方案：
/**
* 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。根据您的特定实现，可以进行少许修改以允许用户DoB的String输入。String的返回类型是用于更新TextView的，可以稍作修改以允许类型int输出。
