Android比较日期时间
我试着比较两个约会时间,但我无法让它起作用Android比较日期时间,android,datetime,Android,Datetime,我试着比较两个约会时间,但我无法让它起作用 public void time () { Calendar c11 = Calendar.getInstance (); c11.add(Calendar.DAY_OF_YEAR, 0); c11.set(Calendar.HOUR_OF_DAY, 9); c11.set(Calendar.MINUTE, 0 ); c11.set(Calendar.SECOND,
public void time () {
Calendar c11 = Calendar.getInstance ();
c11.add(Calendar.DAY_OF_YEAR, 0);
c11.set(Calendar.HOUR_OF_DAY, 9);
c11.set(Calendar.MINUTE, 0 );
c11.set(Calendar.SECOND, 0);
Calendar c12 = Calendar.getInstance ();
c12.add(Calendar.DAY_OF_YEAR, 0);
c12.set(Calendar.HOUR_OF_DAY, 9);
c12.set(Calendar.MINUTE, 0 );
c12.set(Calendar.SECOND, 0);
c11.getTime();
c12.getTime();
boolean k = c11.equals(c12);
if (k==true)
{
Toast.makeText(
getContext(),
"Wow these two times are the same!",
Toast.LENGTH_LONG).show();
}
}
}
public void onDateSelected(DateTime dateSelected){
DateTime currentDateTime=新的日期时间();
试一试{
/*如果只想比较date from DateTime对象的日期,
您可以使用“yyyy-MM-dd”格式并从T中拆分字符串,如:
dateSelected.toString().split(“T”)并使用str1[0]解析*/
SimpleDataFormat格式化程序=新的SimpleDataFormat(“yyyy-MM-dd'T'HH:MM:ss.SSSZZZZ”);
字符串str1=dateSelected.toString();
日期selectedDate=formatter.parse(str1);
字符串str2=currentDateTime.toString();
Date currentDate=formatter.parse(str2);
如果(selectedDate.compareTo)(currentDate),为什么不同的c11和c12的值都设置为相同?不,它们不相同。正如我刚才所说,毫秒是不同的。您需要将两者的毫秒设置为0。现在,毫秒设置为调用Calendar.getInstance()时的当前时间好的,那么还有其他方法可以比较这两个吗?Java日期和日历对象总是包含毫秒。您需要执行以下操作:c11.set(Calendar.millis秒,0);c12.set(Calendar.millis秒,0);然后相等比较将返回true。我们可以将格式作为此函数的参数发送以使其更通用吗?public void onDateSelected(DateTime dateSelected,String format){SimpleDateFormat formatter=new SimpleDateFormat(format);…}是的,您可以这样做:)谢谢Shujat,这将有所帮助
public void onDateSelected(DateTime dateSelected) {
DateTime currentDateTime = new DateTime();
try{
/* If you want to compare only date from DateTime object then,
you can use "yyyy-MM-dd" format and split the string from T like:
dateSelected.toString().split("T") and use str1[0] to parse */
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZZZZ");
String str1 = dateSelected.toString();
Date selectedDate = formatter.parse(str1);
String str2 = currentDateTime.toString();
Date currentDate = formatter.parse(str2);
if (selectedDate.compareTo(currentDate)<0)
{
System.out.println("current date is Greater than my selected date");
}
}catch (ParseException e1){
e1.printStackTrace();
}
}