android 获取日期

 */
	public static HashMap<String, String> computeDate(){
		
		Calendar cal =Calendar.getInstance();
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        
        HashMap<String, String> map = new HashMap<String, String>();
        
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); //获取本周一的日期
//		System.out.println(df.format(cal.getTime()));
		map.put("MONDAY", df.format(cal.getTime()));
		
		cal.set(Calendar.DAY_OF_WEEK, Calendar.TUESDAY); //获取本周二的日期
//		System.out.println(df.format(cal.getTime()));
		map.put("TUESDAY", df.format(cal.getTime()));
		
		cal.set(Calendar.DAY_OF_WEEK, Calendar.WEDNESDAY); //获取本周三的日期
//		System.out.println(df.format(cal.getTime()));
		map.put("WEDNESDAY", df.format(cal.getTime()));
		
		cal.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY); //获取本周四的日期
//		System.out.println(df.format(cal.getTime()));
		map.put("THURSDAY", df.format(cal.getTime()));
		
		cal.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY); //获取本周五的日期
//		System.out.println(df.format(cal.getTime()));
		map.put("FRIDAY", df.format(cal.getTime()));
		
		cal.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY); //获取本周六的日期
//		System.out.println(df.format(cal.getTime()));
		map.put("SATURDAY", df.format(cal.getTime()));
		
		//这种输出的是上个星期周日的日期，因为老外那边把周日当成第一天
		cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
		//增加一个星期，才是我们中国人理解的本周日的日期
		cal.add(Calendar.WEEK_OF_YEAR, 1);
//	    System.out.println(df.format(cal.getTime()));
	    map.put("SUNDAY", df.format(cal.getTime()));
	    
	    return map;
	}