If you use WTK 3.0 or higher touch screen support already enabled.
To enable pointer in emulator in WTK 2.5.x you should edit properties file, which located at WTK_HOME/wtklib/devices/PHONE_MODEL/PHONE_MODEL.properties and edit line with “touch_screen=false” in “touch_screen=true“.
For example in my case(i use WTK distributed with Netbeans 6.8) for DefaultColorPhone need to change file which located at /opt/netbeans-6.8/mobility8/
After this trick you can debug your application on computer – overloaded methods in Canvas like pointerPressed, pointerDragged, pointerReleased now will be work.
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this blog in english