March 2002
Intermediate to advanced
400 pages
8h 44m
English
Content preview from Wireless J2ME™ Platform ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Command and Event Handling
With a Canvas component, you can add and remove high-level commands and set a single command listener to a canvas, just as you can with other displayable components. A Canvas can also implement CommandListener and register itself as its own listener.
In addition to handling high-level commands, however, the Canvas class also handles low-level commands. Canvas components themselves are the source of low-level key and pointer events, which are generated by user key actions and pointer movement on the device. They are also their own low-level event listeners. The Canvas class defines the interface for low-level event handling as part of its own API; there is no other listener interface to implement.
The MIDP implementation ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.