Android获得当前日期和时间的方法

Calendar c = Calendar.getInstance();year  = c.get(Calendar.YEAR);month = c.get(Calendar.MONTH);day   = c.get(Calendar.DAY_OF_MONTH);hour  = c.get(Calendar.HOUR_OF_DAY);minute = c.get(Calendar.MINUTE);second = c.get(Calendar.SECOND);week = c.get(Calendar.DAY_OF_WEEK);