private String getCurrentTime(){
Calendar c = Calendar.getInstance();
		  	int year = c.get(Calendar.YEAR);        //(2)���年���
		    int month = c.get(Calendar.MONTH) + 1;  //(3)�������
		    int day = c.get(Calendar.DATE);         //(4)�������
		    int hour = c.get(Calendar.HOUR_OF_DAY); //(5)�������
		    int minute = c.get(Calendar.MINUTE);    //(6)�������
		    int second = c.get(Calendar.SECOND);    //(7)�������
 
		    return (year + "/" + month + "/" + day + " " + hour + ":" + minute + ":" + second);
 
	}