获取前一天时间

Date date = new Date();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DAY_OF_MONTH, -1);
        Date beforeDate = calendar.getTime();// 结果
        SimpleDateFormat df = new SimpleDateFormat("yyyy.MM.dd");
        String time = df.format(beforeDate);
        return time;