Creating Mobile Games: Using Java ME Platform to Put the Fun by Carol Hamer

By Carol Hamer

Functional Java ME video game tasks with MIDP is or can be the 1st Java video games e-book for the newly up to date and now open resource Java Micro variation (ME). and it'll be first and probably in simple terms that covers all MIDP models 1-3. skilled video game developer and hacker, Carol Hamer, provides in a transparent, obtainable writing and exposition with entire operating examples. on-line updates and discussions can be found via her famous weblog web site. From a simple video game to specialist video game initiatives, this e-book has what try to be a cellular Java online game developer (and player).

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Extra resources for Creating Mobile Games: Using Java ME Platform to Put the Fun into Your Mobile Device and Cell Phone (Technology in Action Press Book)

Example text

For Applets, the application management software is generally a browser. In both cases the application management software performs the same role: it controls the Applet or MIDlet’s lifecycle, and it provides a sandbox for the Applet or MIDlet to run in that limits access to resources. And in both cases, the program’s starting point isn’t the public static void main(String[] args) method. An Applet starts with the start() method, and a MIDlet starts with the startApp() method. After the application management software calls startApp(), it has a couple more methods it uses to control the MIDlet’s lifecycle: pauseApp() and destroyApp().

A MIDlet can query each Display for its capabilities and can use setCurrent() to set a Displayable for each Display. isShown() method to find out whether the AMS honored the request. The AMS can move a MIDlet to the background on one Display and to the foreground on another at will, so in MIDP 3, you have more to keep track of to determine whether your MIDlet has been moved completely to the background. Notice that the example class in Listing 2-1 contains an Alert, which is another subclass of Displayable: } catch(Exception e) { // if there's an error during creation, display it as an alert.

Private Gauge myWidthGauge; 31 32 CHAPTER 2 ■ USING MIDLETS /** * The gauge that displays the number of columns of the maze. */ private Gauge myColumnsGauge; /** * A handle to the main game canvas. */ private MazeCanvas myCanvas; //---------------------------------------------------------------// initialization /** * Create the gauges and place them on the screen. 4. LAYOUT_CENTER); append(myWidthGauge); append(myColumnsGauge); } //---------------------------------------------------------------- CHAPTER 2 ■ USING MIDLETS // implementation of ItemStateListener /** * Respond to the user changing the width.

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