Apr 23, 2009

Setting the Locale in the WTK Emulator

Sometimes it is useful to how your MIDlet works with different locale settings. One solution is to install the MIDlet on a phone and change its locale. This should be easy to do on most phones. However it is useful to do this on the emulator as well. This article teach youo how to do it.

You have basically two ways to do this:
  1. Change the locale of your operating system
  2. Change the locale manually in your wireless toolkit.
I have Windows Vista and I have not get the first way to work. There is a dialog called "Regional and Language Options". All the settings are set to Sweden/Swedish, but still the emulator does not change its locale. I have not found out what I am doing wrong. Fortunately the second option is fairly easy to perform.

First you have to find the emulator.properties file. In Sun's Wireless Toolkit this is found in C:\WTK2.5.2\j2mewtk_template\wtklib and in Sony Ericsson SDK it is found in C:\SonyEricsson\JavaME_SDK_CLDC\WTK2\wtklib.

Then you should search for this property:

In my installation it locked like this:
microedition.locale: en-US

The code consists of two parts; the language code and the country code. These are separated by a dash ('-'). Notice that this is not as in Java SE, where it is separated by and underscore ('_'). The language codes are defined in ISO-639 and the country codes in ISO-3166. In my case I changed it to:
microedition.locale: sv-SE

All you have to do now is to save the file and restart the emulator. Notice that this does not change the locale of the emulator, it only changes what is returned by System.getProperty("microedition.locale"); In my current project we use this to load the correct resources. Thus we need to test how the different strings are looking in different languages and screen resolutions.

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