android时间精确到毫秒calendar

我来写笔记啦，直接上代码，简单易懂

Calendar ca = Calendar.getInstance();
	int year = ca.get(Calendar.YEAR);
	int month = ca.get(Calendar.MONTH)+1;
	int day = ca.get(Calendar.DAY_OF_MONTH);
	int hour = ca.get(Calendar.HOUR);
	int min = ca.get(Calendar.MINUTE);
	int s = ca.get(Calendar.SECOND);
	int m = ca.get(Calendar.MILLISECOND);