I have a program which should display the current time. It displays the right time immediately after I install it to a phone. But after that, whenever I run the application, the time doesn't change at all.
Here's my code:
Calendar cal = new GregorianCalendar();
hour = cal.get(Calendar.HOUR);
minute = cal.get(Calendar.MINUTE);
second = cal.get(Calendar.SECOND);
year = cal.get(Calendar.YEAR);
month = cal.get(Calendar.MONTH)+1;
day = cal.get(Calendar.DATE);
date = day+"_"+month+"_"+year+"_";
Current_Time = date+ hour + "_" + minute + "_" + second;
Shekhar... I had the same misunderstanding. When you create an instance of calendar, it represents the date at which it was instantiated and that state does not change! So, to get the current "date" you need to create a new instance.
JAL
You can write it as a method. Each call to create a new instance of the Calendar
Related
Actually i want to display a set of data with the start and end date of the week were that particular date falls on. In my emulator its working fine. Eg. If i give Apr 23 its giving me start date of the week as 22 Apr and end date as 28 Apr, but if i try to build the same code in my device its showing start date of the week as 27 Apr and end date as 28 Apr.
Piece of Code which i am using:
//to get first day of week
cal1.set(Calendar.DAY_OF_WEEK, 1);
int day1 = cal1.get(Calendar.DAY_OF_MONTH);
//to get last day of week
cal1.set(Calendar.DAY_OF_WEEK, 7);
int day7 = cal1.get(Calendar.DAY_OF_MONTH);
I don't know why you getting that data but this is how I get the first and last date, take look might help. (its written to give current week's first and last date, so might have to tweak it little bit.)
Calendar calendar = Calendar.getInstance();
Date date1 = calendar.getTime();
//current date to check that our week lies in same month or not
SimpleDateFormat checkformate = new SimpleDateFormat("MM/yyyy");
String currentCheckdate= checkformate.format(date1);
int weekn = calendar.get(Calendar.WEEK_OF_MONTH);
int month = calendar.get(Calendar.MONTH);
int year = calendar.get(Calendar.YEAR);
//resat calender without date
calendar.clear();
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.set(Calendar.WEEK_OF_MONTH,weekn);
calendar.set(Calendar.MONTH,month);
calendar.set(Calendar.YEAR,year);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd/MM/yyyy");
Date datef = calendar.getTime();
//move date to 6 days + to get last date of week
Long timeSixDayPlus = calendar.getTimeInMillis()+518400000L;
Date dateL = new Date(timeSixDayPlus);
String firtdate = simpleDateFormat.format(datef);
String lastdate = simpleDateFormat.format(dateL);
String firtdateCheck = checkformate.format(datef);
String lastdateCheck = checkformate.format(dateL);
//if our week lies in two different months then we show only current month week part only
if (!firtdateCheck.toString().equalsIgnoreCase(currentCheckdate)) {
firtdate = "1" + "/" + calendar.get(Calendar.MONTH) + "/" + calendar.get(Calendar.YEAR);
}
if (!lastdateCheck.toString().equalsIgnoreCase(currentCheckdate)) {
int ma = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
lastdate = String.valueOf(ma) + "/" + calendar.get(Calendar.MONTH) + "/" + calendar.get(Calendar.YEAR);
}
Log.e("current","=>>"+firtdate+" to "+lastdate);
To get the first day of the week -
initialize the Calendar as per your need. in this case, I am getting the current date calendar.
set the current day of the week to the first day of the week.
get the corresponding date.
Calendar calendar = Calendar.getInstance();
//optional step
calendar.setFirstDayOfWeek(Calendar.SUNDAY);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
int firstDateOfWeek = calendar.get(Calendar.DATE);
To get the last date of the week -
follow the step as above to initialize.
set the day of the week as Saturday.
get the corresponding date.
Calendar calendar = Calendar.getInstance();
//optional step
calendar.setFirstDayOfWeek(Calendar.SUNDAY);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.SATURDAY);
int lastDateOfWeek = calendar.get(Calendar.DATE);
In this way, you can get eh first and the last date for the week. one thing to keep in mind that I have set the first day of the week as SUNDAY. set as per your need. although it is purely optional to set the first day of the week. this gives you a more transparency in code.
I use the Time class to get the current time, and I need to get it in the mm.hh format. To do this, I use the following approach:
Time time = new Time();
time.setToNow();
String currentTime = time.hour + ":" + time.minute;
Can I increase the current time, for example, by one hour in this case?
Time time = new Time();
time.setToNow();
++time.hour; // increase 1 hour
time.normalize(false);
First increase your hour and then format it again:
Date date = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.HOUR, 1);
String currentTime = calendar.get(Calendar.HOUR) + ":" + calendar.get(Calendar.MINUTE);
if you need hour in 24-format use Calendar.HOUR_OF_DAY
Try this:
Time time = new Time();
time.setToNow();
time.hour++;
time.toMillis(false);
public static final String inputFormat = "HH:mm";
private Date date;
private Date dateCompareOne;
private Date dateCompareTwo;
LINE 5:
private String compareStringOne = String.valueOf(SetTimeActivity.intFromTimeH)+ ":"+ String.valueOf(SetTimeActivity.intFromTimeM) ;
LINE 6:
private String compareStringTwo = String.valueOf(SetTimeActivity.intToTimeH) + ":"+ String.valueOf(SetTimeActivity.intToTimeM);
SimpleDateFormat inputParser = new SimpleDateFormat(inputFormat, Locale.US);
private void compareDates()
{
Calendar now = Calendar.getInstance();
int hour = now.get(Calendar.HOUR_OF_DAY);
int minute = now.get(Calendar.MINUTE);
date = parseDate(hour + ":" + minute);
dateCompareOne = parseDate(compareStringOne);
dateCompareTwo = parseDate(compareStringTwo);
if (!(dateCompareOne.before( date ) && dateCompareTwo.after(date))) {
....
I am trying to check if current time falls between the specified time. For that I am converting the specified time into strings first (in Line5 & Line6). Even though I get the integer values correct, the string formed always shows "0:0".
Also, the year is shown as 1970 (The date & the day shown are wrong as well).
I need to get the current time. What am I doing wrong?
private Date parseDate(String date) {
try {
return inputParser.parse(date);
} catch (java.text.ParseException e) {
return new Date(0);
}
}
The parseDate() function returns the time elapsed since the 1st of January 1970. This is known as the Unix Epoch, and it's how all time is represented in Unix computers. By running the parseDate function on a string containing just hours and minutes, you're creating a Date object which represents a time HH:mm past the first of January 1970.
Your code is using a really odd way of getting the current time. Converting a Calendar to two ints, then to a string and finally parsing back to a Date is going to be inefficient and open you up to all sorts of needless errors.
When you initialise a new Date object it is automatically assigned the time of initialisation. Therefore:
Date d = new Date();
would result in d being the moment of initialisation (that is, this year, month, day, hour, minute, second and microsecond). Then you can just use Date.after() and Date.before().
If you still want to do it via the Calendar method, then you'd be better served by:
cal = Calendar.getInstance();
Date d = cal.getTime();
It may be that you've got other issues, but it's worth doing it properly first. When you pass data by writing it as a string (especially when it's time related, with all sorts of ambiguities about what "12" actually represents) you lose all the advantages that language typing gives you.
this code help you
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE); if (c.get(Calendar.AM_PM) == Calendar.AM)
am_pm = "AM";
else if (c.get(Calendar.AM_PM) == Calendar.PM)
am_pm = "PM";
// Calendar c = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss a");
String formattedDate = df.format(c.getTime());
Toast.makeText(this, formattedDate, Toast.LENGTH_SHORT).show();
If you already work with Date objects why not using the Date.after(...) and Date.before(...) methods.
I am trying to take hours that I've parsed using SimpleDateFormat and determining whether or not the current time is between the two sets of hours. Basically, given a place's hours, I'm trying to determine if it is currently open our closed.
I am getting the current time by doing the following:
SimpleDateFormat sdf2 = new SimpleDateFormat("kk:mm");
Calendar now = Calendar.getInstance();
int hour = now.get(Calendar.HOUR);
int minute = now.get(Calendar.MINUTE);
String currentHour = Integer.toString(hour);
String currentMinute = Integer.toString(minute);
String timeNow = currentHour + ":" + currentMinute;
Date timeRightNow = sdf2.parse(timeNow);
Then, I determine whether timeRightNow is between the opening and closing times, I am doing the following:
if (timeOpen.before(timeRightNow) && timeClose.after(timeRightNow)) {
openStatus = "open!";
} else {
openStatus = "closed.";
}
Both timeOpen and timeClose are found by parsing a String using sdf2 in the exact same way as timeRightNow is found.
Every time that this runs, it sets openStatus to "closed." even when the current time is between the open and close times. Can anyone point me in the right direction to figure out why this is happening?
I changed Calendar.HOUR to Calendar.HOUR_OF_DAY. This resolved the issue.
I've been trying to find the answer to this for a while today and there's just so much contradictory information....
What I'd like to do is get a current unix timestamp in android, and then convert it to a format that allows me to getHours() and getMinutes().
I'm currently doing this:
int time = (int) (System.currentTimeMillis());
Timestamp ts = new Timestamp(time);
mHour = ts.getHours();
mMinute = ts.getMinutes();
But it's not giving me a correct value for hour or minute (it's returning 03:38 for the current East-coast time of 13:33).
This works:
final Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(System.currentTimeMillis());
Date date = cal.getTime();
mHour = date.getHours();
mMinute = date.getMinutes();
Just use the Java Calendar class.
Calendar c = new GregorianCalendar(); // This creates a Calendar instance with the current time
mHour = c.get(Calendar.HOUR);
mMinute = c.get(Calendar.MINUTE);
Also note that your Android emulator will return times in GMT for the current time. I advise testing this type of code on a real device.
int time = (int) (System.currentTimeMillis());
here you should use long instead of int.
Use Time class form Google it is the best for this kind of job specialy it has good performance not like Calendar.