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all of the hype around j2me these days seems to center around game development on cell phones. while this is certainly an exciting application space, it is important to remember that not all graphical applications are games, and not all business applications are limited to text.
scratch can be run as a standalone program, or it can be customized and integrated into your application. the name "scratch" has a bit of a double meaning -- it alludes to the obvious "scratchpad" functionality, while also paying homage to the adage, "open source applications are written to scratch a particular itch." my itch was a simple solution for capturing signatures using off-the-shelf hardware and software. your itch might be a general purpose notepad or a rudimentary drawing widget. scratch should do to the trick. 【程序编程相关:The New Obfuscation】
java.net">scratch is an open source solution that allows you to capture signatures on a touchscreen-enabled j2me device. while many j2me applications seem to require cutting-edge apis that can run on only a handful of high-end models, scratchs requirements are bare minimum -- nothing but cldc 1.0 and midp 1.0. you can run it on a low-end, sub-$100, black-and-white palm device. i dont know of any j2me devices other than palms that have touchscreens, so palms will be the target platform for the remainder of this article. if there are others out there, and you can successfully run scratch on them, id love to hear about it. 【推荐阅读:Principles, Patterns】
in the spirit of full disclosure, i should tell you what scratch doesnt do. scratch does not do handwriting recognition. it is not meant to be a graffiti replacement. it doesnt allow you to use multiple colors or even have an eraser. it is a simple black-and-white wysiwyg drawing program. if your particular need runs in one of these other directions, scratch is a jumping-off point -- thats the beauty of an open source solution. ok, the real beauty of an open source solution would be to provide you with a complete solution to your problem out of the box. the typical cranky open source developers response to this would be something like, "scratch your own stupid itch -- im busy right now."
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