Android 获取 当前日期的前后n天的实现

先上代码，-distanceDay代表要获取当前N天前的日期，

           +distanceDay代表要获取当前N天后的日期

public static String getOldDate(int distanceDay) {    SimpleDateFormat dft = new SimpleDateFormat("yyyy-MM-dd");    Date beginDate = new Date();    Calendar date = Calendar.getInstance();    date.setTime(beginDate);    date.set(Calendar.DATE, date.get(Calendar.DATE) - distanceDay);    Date endDate = null;    try {        endDate = dft.parse(dft.format(date.getTime()));    } catch (ParseException e) {        e.printStackTrace();    }    return dft.format(endDate);}