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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Screen Navigation
The HelloWorld2 example demonstrates the central abstraction of the MIDP, the Screen. You've undoubtedly noticed already that you can only display one Displayable—one Screen—at a time. When the application needed to display the Alert, it had to replace the main screen.
The reason for this single-screen abstraction is the limitation of device screen resources. Unlike desktop GUI toolkits, such as J2SE's Swing toolkit, you don't have the luxury of layered windows, pop-ups, dialog boxes, and so forth. Although not impossible to implement these abstractions, the memory and CPU requirements are prohibitive for today's mobile devices. Furthermore, the low-resolution, low-powered, small-area LCD displays characteristic of most mobile ...
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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.
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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.