public static String getTime() {	
		Calendar cal = Calendar.getInstance();
		
		String hour = String.valueOf(cal.get(Calendar.HOUR_OF_DAY));
		if (hour.length() == 1) {
			hour = "0" + hour; //pad with zero for 0..9
		}
		
		String min = String.valueOf(cal.get(Calendar.MINUTE));
		if (min.length() == 1) {
			min = "0" + min; //pad with zero for 0..9
		}
		
		String sec = String.valueOf(cal.get(Calendar.SECOND));
		if (sec.length() == 1) {
			sec = "0" + sec; //pad with zero for 0..9
		}
		
		return hour + "_" + min + "_" + sec;	
	}