[android-beginners] Re: How to format time in millis to human readable?

2009-03-09 Thread Steven Farley 

Just out of curiosity, has anybody tried using Joda Time (http://joda-
time.sourceforge.net/) in an Android application?  The Joda API is
much better than Java's built-in Date and Calendar classes.

++Steve

On Mar 8, 12:54 pm, sm1 sergemas...@gmail.com wrote:
 There may be built-in methods for such things as 5 minutes ago but I
 don't know any yet.

 for the current time in human-readable form, using some default date
 display format (which may or may not be dependent on user-preferred
 locale and date format selection, this remains TBD for Android), the
 fastest way is:

 +new Date()

 and with a given time in millis, it would be as in:

  Build.TIME +Build.TIME+ = +new Date(Build.TIME)

 Calendar is recommended for conversions (e.g., time zone changes) and
 for other calculations with dates, such add, after, before, compareTo.

 When you create a Calendar, it is already set to the current time:

 Calendar cal = Calendar.getInstance();

 is usually equivalent and preferable to:

 long millis = System.currentTimeMillis(); //don't do these 4
 statements
 Date date = new Date(millis);
 Calendar c = Calendar.getInstance();
 c.setTime(date);

 And if you need to use SimpleDateFormat, because for example you don't
 want to use the default format you get from Date, then take special
 care because some implementations are not multithreaded, therefore
 unless you know for sure that Android's implementation is
 multithreaded, then don't cache the instance and use a local variable
 that only lives in the method, don't use a field. This makes
 SimpleDateFormat somewhat expansive to use but usually it is only used
 for some UI work (i.e., not background work), therefore using it may
 be OK for many apps.

 happy coding
 serge

 On Mar 8, 4:33 am, TAKEphONE shimo...@gmail.com wrote:

  Hi,

  Is there any internal method/object I can use to return a format
  like the built-in call log does ?

  (i.e. 5 minutes ago, 2 days ago...)

  On Mar 6, 2:55 pm, Tseng tseng.priv...@googlemail.com wrote:

   I wouldn't really use this method to be honest. Even the Android
   Documentation sugest to use native methods, instead of writing your
   own stuff for methods which are already available (i.e. simple date
   formating).

   [Use Native 
   Methods]http://developer.android.com/guide/practices/design/performance.html#...

   On Mar 6, 1:20 pm, droozen droozenr...@gmail.com wrote:

Sometimes I construct my human readable strings in a separate function
by myself, mostly because I imagine it's faster. Something like.

int iMonth = cal.get(Calendar.MONTH) + 1; // Months from the calendar
are offset by one. Add one if you want human readable.
int iDay = cal.get(Calendar.DAY_OF_MONTH);

String month = Integer.toString(iMonth);
if(iMonth  10){
    month = 0 + month; // Otherwise, you might get something like
1/1/1900, instead of 01/01/1900

}

String day = Integer.toString(iDay);
if(iDay  10){
    day = 0 + day;

}

String humanReadable = month + / + day + / cal.get(Calendar.YEAR);

But really, you should be using SimpleDateFormat, I suppose...

On Mar 6, 5:55 am, Łukasz Warchoł warchol...@gmail.com wrote:

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[android-beginners] Re: How to format time in millis to human readable?

2009-03-08 Thread TAKEphONE 

Hi,

Is there any internal method/object I can use to return a format
like the built-in call log does ?

(i.e. 5 minutes ago, 2 days ago...)

On Mar 6, 2:55 pm, Tseng tseng.priv...@googlemail.com wrote:
 I wouldn't really use this method to be honest. Even the Android
 Documentation sugest to use native methods, instead of writing your
 own stuff for methods which are already available (i.e. simple date
 formating).

 [Use Native 
 Methods]http://developer.android.com/guide/practices/design/performance.html#...

 On Mar 6, 1:20 pm, droozen droozenr...@gmail.com wrote:

  Sometimes I construct my human readable strings in a separate function
  by myself, mostly because I imagine it's faster. Something like.

  int iMonth = cal.get(Calendar.MONTH) + 1; // Months from the calendar
  are offset by one. Add one if you want human readable.
  int iDay = cal.get(Calendar.DAY_OF_MONTH);

  String month = Integer.toString(iMonth);
  if(iMonth  10){
      month = 0 + month; // Otherwise, you might get something like
  1/1/1900, instead of 01/01/1900

  }

  String day = Integer.toString(iDay);
  if(iDay  10){
      day = 0 + day;

  }

  String humanReadable = month + / + day + / cal.get(Calendar.YEAR);

  But really, you should be using SimpleDateFormat, I suppose...

  On Mar 6, 5:55 am, Łukasz Warchoł warchol...@gmail.com wrote:

  - Show quoted text -
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[android-beginners] Re: How to format time in millis to human readable?

2009-03-08 Thread sm1 

There may be built-in methods for such things as 5 minutes ago but I
don't know any yet.

for the current time in human-readable form, using some default date
display format (which may or may not be dependent on user-preferred
locale and date format selection, this remains TBD for Android), the
fastest way is:

+new Date()

and with a given time in millis, it would be as in:

 Build.TIME +Build.TIME+ = +new Date(Build.TIME)

Calendar is recommended for conversions (e.g., time zone changes) and
for other calculations with dates, such add, after, before, compareTo.

When you create a Calendar, it is already set to the current time:

Calendar cal = Calendar.getInstance();

is usually equivalent and preferable to:

long millis = System.currentTimeMillis(); //don't do these 4
statements
Date date = new Date(millis);
Calendar c = Calendar.getInstance();
c.setTime(date);

And if you need to use SimpleDateFormat, because for example you don't
want to use the default format you get from Date, then take special
care because some implementations are not multithreaded, therefore
unless you know for sure that Android's implementation is
multithreaded, then don't cache the instance and use a local variable
that only lives in the method, don't use a field. This makes
SimpleDateFormat somewhat expansive to use but usually it is only used
for some UI work (i.e., not background work), therefore using it may
be OK for many apps.

happy coding
serge

On Mar 8, 4:33 am, TAKEphONE shimo...@gmail.com wrote:
 Hi,

 Is there any internal method/object I can use to return a format
 like the built-in call log does ?

 (i.e. 5 minutes ago, 2 days ago...)

 On Mar 6, 2:55 pm, Tseng tseng.priv...@googlemail.com wrote:

  I wouldn't really use this method to be honest. Even the Android
  Documentation sugest to use native methods, instead of writing your
  own stuff for methods which are already available (i.e. simple date
  formating).

  [Use Native 
  Methods]http://developer.android.com/guide/practices/design/performance.html#...

  On Mar 6, 1:20 pm, droozen droozenr...@gmail.com wrote:

   Sometimes I construct my human readable strings in a separate function
   by myself, mostly because I imagine it's faster. Something like.

   int iMonth = cal.get(Calendar.MONTH) + 1; // Months from the calendar
   are offset by one. Add one if you want human readable.
   int iDay = cal.get(Calendar.DAY_OF_MONTH);

   String month = Integer.toString(iMonth);
   if(iMonth  10){
       month = 0 + month; // Otherwise, you might get something like
   1/1/1900, instead of 01/01/1900

   }

   String day = Integer.toString(iDay);
   if(iDay  10){
       day = 0 + day;

   }

   String humanReadable = month + / + day + / cal.get(Calendar.YEAR);

   But really, you should be using SimpleDateFormat, I suppose...

   On Mar 6, 5:55 am, Łukasz Warchoł warchol...@gmail.com wrote:

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[android-beginners] Re: How to format time in millis to human readable?

2009-03-07 Thread droozen 


That page also said not to use native methods for trivial computation.
In my experience the Java Calendar and Date objects are expensive and
memory hungry. Avoid them, including their DateFormatters, whenever
possible. That being said, it probably shouldn't matter much unless
you are performing many calculations in a loop. So the only real time
to consider avoiding them, I guess, is when you are investigating
performance problems.
On Mar 6, 6:55 am, Tseng tseng.priv...@googlemail.com wrote:
 I wouldn't really use this method to be honest. Even the Android
 Documentation sugest to use native methods, instead of writing your
 own stuff for methods which are already available (i.e. simple date
 formating).

 [Use Native 
 Methods]http://developer.android.com/guide/practices/design/performance.html#...

 On Mar 6, 1:20 pm, droozen droozenr...@gmail.com wrote:

  Sometimes I construct my human readable strings in a separate function
  by myself, mostly because I imagine it's faster. Something like.

  int iMonth = cal.get(Calendar.MONTH) + 1; // Months from the calendar
  are offset by one. Add one if you want human readable.
  int iDay = cal.get(Calendar.DAY_OF_MONTH);

  String month = Integer.toString(iMonth);
  if(iMonth  10){
      month = 0 + month; // Otherwise, you might get something like
  1/1/1900, instead of 01/01/1900

  }

  String day = Integer.toString(iDay);
  if(iDay  10){
      day = 0 + day;

  }

  String humanReadable = month + / + day + / cal.get(Calendar.YEAR);

  But really, you should be using SimpleDateFormat, I suppose...

  On Mar 6, 5:55 am, Łukasz Warchoł warchol...@gmail.com wrote:

  - Show quoted text -
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[android-beginners] Re: How to format time in millis to human readable?

2009-03-06 Thread Łukasz Warchoł 
I would use:

Date date = new Date();
date.setTime(milliseconds);

and now from date you can read all: year, month, day, hour, min. and sec.


Marcus pisze:
 Hi,

 as I understand, the internal date-format is the time in millis, since
 it is the format to store in sqlite and the format I get from
 System.currentTimeMillis().

 But how can I convert this back to a human readable format? Do I have
 to use new Date(int) and then use a SimpleDateFormat? Or is there any
 convinience method?
 
   


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[android-beginners] Re: How to format time in millis to human readable?

2009-03-06 Thread droozen 

The Date object works, but much better to use Calendar.

Calendar cal = Calendar.getInstance();
cal.setTime(milliseconds);

SimpleDateFormat sdf  = new SimpleDateFormat(MM/dd/); // see
javadocs for how to construct date strings.
sdf.format(cal.getTime());

Sometimes I construct my human readable strings in a separate function
by myself, mostly because I imagine it's faster. Something like.

int iMonth = cal.get(Calendar.MONTH) + 1; // Months from the calendar
are offset by one. Add one if you want human readable.
int iDay = cal.get(Calendar.DAY_OF_MONTH);

String month = Integer.toString(iMonth);
if(iMonth  10){
month = 0 + month; // Otherwise, you might get something like
1/1/1900, instead of 01/01/1900
}

String day = Integer.toString(iDay);
if(iDay  10){
day = 0 + day;
}

String humanReadable = month + / + day + / cal.get(Calendar.YEAR);

But really, you should be using SimpleDateFormat, I suppose...

On Mar 6, 5:55 am, Łukasz Warchoł warchol...@gmail.com wrote:
 I would use:

 Date date = new Date();
 date.setTime(milliseconds);

 and now from date you can read all: year, month, day, hour, min. and sec.

 Marcus pisze:

  Hi,

  as I understand, the internal date-format is the time in millis, since
  it is the format to store in sqlite and the format I get from
  System.currentTimeMillis().

  But how can I convert this back to a human readable format? Do I have
  to use new Date(int) and then use a SimpleDateFormat? Or is there any
  convinience method?
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[android-beginners] Re: How to format time in millis to human readable?

2009-03-06 Thread Tseng 

I wouldn't really use this method to be honest. Even the Android
Documentation sugest to use native methods, instead of writing your
own stuff for methods which are already available (i.e. simple date
formating).

[Use Native Methods]
http://developer.android.com/guide/practices/design/performance.html#native_methods

On Mar 6, 1:20 pm, droozen droozenr...@gmail.com wrote:
 Sometimes I construct my human readable strings in a separate function
 by myself, mostly because I imagine it's faster. Something like.

 int iMonth = cal.get(Calendar.MONTH) + 1; // Months from the calendar
 are offset by one. Add one if you want human readable.
 int iDay = cal.get(Calendar.DAY_OF_MONTH);

 String month = Integer.toString(iMonth);
 if(iMonth  10){
     month = 0 + month; // Otherwise, you might get something like
 1/1/1900, instead of 01/01/1900

 }

 String day = Integer.toString(iDay);
 if(iDay  10){
     day = 0 + day;

 }

 String humanReadable = month + / + day + / cal.get(Calendar.YEAR);

 But really, you should be using SimpleDateFormat, I suppose...

 On Mar 6, 5:55 am, Łukasz Warchoł warchol...@gmail.com wrote:



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[android-beginners] Re: How to format time in millis to human readable?

2009-03-06 Thread Tommaso 

Hi Marcus,

if I get you correctly, you want to display a date in a readable
format that comes from miiliseconds.

System.currentTimeMillis() returns a primitive long, so Date date =
new Date(System.currentTimeMillis()) will not work.

Try this:
long millis = System.currentTimeMillis();
Date date = new Date(millis);
Calendar c = Calendar.getInstance();
c.setTime(date);

System.out.println(millis +  ms correspond to mm-dd- + c.get
(Calendar.MONTH) + - + c.get(Calendar.DATE) + - + c.get
(Calendar.YEAR));

Ciao,
  Tommaso

On 6 Mrz., 09:33, Marcus marcus.ter...@gmail.com wrote:
 Hi,

 as I understand, the internal date-format is the time in millis, since
 it is the format to store in sqlite and the format I get from
 System.currentTimeMillis().

 But how can I convert this back to a human readable format? Do I have
 to use new Date(int) and then use a SimpleDateFormat? Or is there any
 convinience method?

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