Introduces the MIDP 2.0 GameCanvas class and the game loop concept. Required reading for all aspiring "first person shooter" developers.
Tutorial Details:
Many, perhaps most, of the early commercial applications developed on the J2ME platform were games. With all the obvious interest in gaming - and the many device-specific gaming extensions developed by different handset vendors - it was no surprise to anyone that the Java Community Process group responsible for defining MIDP 2.0 introduced basic gaming capabilities. Let's take a look at the core of those capabilities, the GameCanvas class.
The GameCanvas class, found in the javax.microedition.lcdui.game package, extends the venerable Canvas class. As you know, Canvas lets an application draw screens using the low-level user-interface API, and also receive key and pointer events directly. The shortcoming of Canvas is that it gives the application no control over when a canvas repaints itself - all it can do is request a repaint - or over how quickly key and pointer events get delivered to the canvas. This lack of control can cause action games and others that are speed-sensitive to feel sluggish and unresponsive. GameCanvas was designed specifically to fix these weak points.
The first thing to remember, though, is that a game canvas is still a canvas, so all the usual behavior is there. The showNotify() and hideNotify() methods are still called when the canvas is shown and hidden. Key and pointer events are still delivered, except for certain key events which optionally can be suppressed. You still have to do all the drawing yourself, and you can still attach Command objects to the canvas. Here's a very simple test canvas you can use inside a MIDlet you run with the J2ME Wireless Toolkit 2.0 or higher:
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