×
Namespaces

Variants
Actions
(Difference between revisions)

Converting time zones in Java ME

From Nokia Developer Wiki
Jump to: navigation, search
hamishwillee (Talk | contribs)
m (Hamishwillee - Bot update)
hamishwillee (Talk | contribs)
m (Hamishwillee - Add Abstract. Tidy wiki text)
(7 intermediate revisions by 2 users not shown)
Line 1: Line 1:
 +
[[Category:Java ME]][[Category:Code Examples]][[Category:General Programming]][[Category:Series 40]][[Category:Symbian]][[Category:S60 3rd Edition (initial release)]][[Category:S60 3rd Edition FP1]][[Category:S60 3rd Edition FP2]][[Category:Series 40 6th Edition FP1]][[Category:Series 40 Developer Platform 2.0]][[Category:Nokia Belle]][[Category:Localization]]
 +
{{Abstract|This code snippet demonstrates how to convert time zones. }}
 +
 
{{ArticleMetaData <!-- v1.2 -->
 
{{ArticleMetaData <!-- v1.2 -->
|sourcecode= [[Media:Converting time zones in J2ME.zip]]  
+
|sourcecode= [[Media:Converting time zones in J2ME.zip]]
 
|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
 
|installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
|devices= Nokia E70, Nokia N78
+
|devices= Nokia E70, Nokia N78, Nokia C3-01, Nokia Asha 306, Nokia E7-00
|sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
+
|sdk= [http://www.developer.nokia.com/Develop/Java/ Nokia SDK 1.1 for Java], [http://www.developer.nokia.com/Develop/Java/ Nokia SDK 2.0 for Java (beta)], [http://www.developer.nokia.com/info/sw.nokia.com/id/ec866fab-4b76-49f6-b5a5-af0631419e9c/S60_All_in_One_SDKs.html/ Nokia Symbian SDKs]
|platform= S60 3rd Edition, S60 3rd Edition, FP1, S60 3rd Edition, FP2
+
|platform= Series 40, S60, Nokia Belle
 
|devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
 
|devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
 
|dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
 
|dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
Line 21: Line 24:
 
|author= [[User:Vltsoy]]
 
|author= [[User:Vltsoy]]
 
<!-- The following are not in current metadata -->
 
<!-- The following are not in current metadata -->
|subcategory= Date/time/clock
 
 
|id= CS001199
 
|id= CS001199
 
}}
 
}}
  
 
==Overview==
 
==Overview==
 
This code snippet demonstrates how to convert time zones.
 
  
 
A list of all supported time zones is shown on the screen. By choosing a time zone from the list, the user can see the time offset it has.
 
A list of all supported time zones is shown on the screen. By choosing a time zone from the list, the user can see the time offset it has.
Line 35: Line 35:
  
 
<code java>
 
<code java>
 
 
import java.util.TimeZone;
 
import java.util.TimeZone;
 
import javax.microedition.lcdui.Command;
 
import javax.microedition.lcdui.Command;
Line 139: Line 138:
  
 
The source file and executable application are available for download at [[Media:Converting time zones in J2ME.zip]].
 
The source file and executable application are available for download at [[Media:Converting time zones in J2ME.zip]].
 
[[Category:Java ME]][[Category:Code Examples]][[Category:Code Snippet]]
 

Revision as of 09:30, 5 October 2012

This code snippet demonstrates how to convert time zones.

Article Metadata
Code ExampleTested with
Devices(s): Nokia E70, Nokia N78, Nokia C3-01, Nokia Asha 306, Nokia E7-00
CompatibilityArticle
Keywords: java.util.TimeZone, java.util.TimeZone.getAvailableIDs, java.util.TimeZone.getRawOffset
Created: vltsoy (27 Nov 2008)
Last edited: hamishwillee (05 Oct 2012)

Contents

Overview

A list of all supported time zones is shown on the screen. By choosing a time zone from the list, the user can see the time offset it has. Method TimeZone.getTimeZone() allows the application to retrieve the chosen Time Zone and method TimeZone.getRawOffset() is used to retrieve the raw time offset for the chosen time zone.

Source file: ConvertingTimeZones.java

import java.util.TimeZone;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.List;
import javax.microedition.midlet.MIDlet;
 
public class ConvertingTimeZones extends MIDlet implements CommandListener {
 
private List list;
private Form form;
private Display display;
private TimeZone timeZone;
private Command backCommand;
private Command exitCommand;
 
/**
* Constructor. Constructs the object and initializes buffer.
*/

public ConvertingTimeZones() {
timeZone = TimeZone.getDefault();
backCommand = new Command("Back", Command.BACK, 1);
exitCommand = new Command("Exit", Command.EXIT, 0);
 
form = new Form("Time zone info");
form.addCommand(backCommand);
form.setCommandListener(this);
 
//Create list filled with all available time zone IDs.
list = new List("Select time zone:", List.IMPLICIT,
timeZone.getAvailableIDs(), null);
list.addCommand(exitCommand);
list.setCommandListener(this);
 
display = Display.getDisplay(this);
display.setCurrent(list);
}
 
/**
* From CommandListener.
* Called by the system to indicate that a command has been invoked on a
* particular displayable.
* @param cmd the command that was invoked
* @param displayable the displayable where the command was invoked
*/

public void commandAction(Command cmd, Displayable displayable) {
if (cmd == List.SELECT_COMMAND) {
//Clear form.
form.deleteAll();
//Get selected time zone index.
String timeZoneID = list.getString(list.getSelectedIndex());
form.append("Time zone ID: " + timeZoneID + "\n");
form.append("Time offset: ");
//Display the GMT offset for selected time zone in hours.
form.append(String.valueOf(
timeZone.getTimeZone(timeZoneID).getRawOffset() / 3600000));
form.append(" hours");
 
display.setCurrent(form);
} else if (cmd == backCommand) {
display.setCurrent(list);
} else if (cmd == exitCommand) {
notifyDestroyed();
}
}
 
/**
* From MIDlet.
* Called when the MIDlet is started.
*/

public void startApp() {
// No implementation required.
}
 
/**
* From MIDlet.
* Called to signal the MIDlet to enter the Paused state.
*/

public void pauseApp() {
// No implementation required.
}
 
/**
* From MIDlet.
* Called to signal the MIDlet to terminate.
* @param unconditional whether the MIDlet has to be unconditionally
* terminated
*/

public void destroyApp(boolean unconditional) {
}
}

Postconditions

This application allows the user to retrieve the time offset for any time zone he or she needs.

Supplementary material

The source file and executable application are available for download at Media:Converting time zones in J2ME.zip.

104 page views in the last 30 days.