android - 检查今天的日期和android中的前一个日期之间的差异

Question

我必须找出今天的日期和之前的另一个日期之间的天差。我怎样才能找到？？

我写代码:

Calendar calfromDate = Calendar.getInstance();
calfromDate.set(m_nVYear, m_nVMonth, m_nVDay);
long m_lDate = calfromDate.getTimeInMillis();
Calendar calToday = Calendar.getInstance();
long today = calToday.getTimeInMillis();
Log.d("debug", "today:" +today);
Log.d("debug", "from date:" +m_lDate);
int day_difference = (int)((m_lDate - today)/(24*60*60*1000));

Answer 1

来自 http://tripoverit.blogspot.com/2007/07/java-calculate-difference-between-two.html :

public static long daysBetween(Calendar startDate, Calendar endDate) {  
   Calendar date = (Calendar) startDate.clone();  
   long daysBetween = 0;  
   while (date.before(endDate)) {  
     date.add(Calendar.DAY_OF_MONTH, 1);  
     daysBetween++;  
   }  
   return daysBetween;  
 }