Beginning J2ME. From Novice to Pro by Sing Li, Jonathan Knudsen

By Sing Li, Jonathan Knudsen

Have you ever thought of development video games on your cellular phone or different instant units? no matter if you're a first-time instant Java developer, or an skilled expert— starting J2ME, 3rd variation brings fascinating instant and cellular Java program improvement correct for your door!
This publication will empower you with quite a few themes: sound HTTPS aid, consumer interface API improvements, sound/music API, a online game API, 3D photographs, and Bluetooth. extra, this publication is simple to learn and contains many functional, hands-on, and ready-to-use code examples. you won't be upset.

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Extra resources for Beginning J2ME. From Novice to Pro

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You’ve just built and run your first MIDlet. CHAPTER 2 ■ BUILDING MIDLETS Using the Emulator Controls The J2ME Wireless Toolkit emulator appears as a generic mobile phone, as shown in Figure 2-2. Figure 2-2. Buttons on the J2ME Wireless Toolkit emulator SUN’s J2ME Wireless Toolkit emulator exhibits several qualities that you are likely to find in real devices: • The device has a small screen size and limited input capabilities. ) • Two soft buttons are available. A soft button does not have a fixed function.

In general, it makes sense to store application properties in the application descriptor file. Because it’s distinct from the MIDlet suite JAR, the application descriptor can easily be changed to modify the behavior of your MIDlets. You might, for example, store a URL or other configuration information in the application descriptor. url"); CHAPTER 3 ■ ALL ABOUT MIDLETS Changing the URL is as easy as changing the application descriptor, a simple text file. None of your code needs to be recompiled.

More robust rules are based on cryptographic solutions for data integrity and authentication. 509 PKI” describes one such scheme, including additional manifest attributes. MIDlet suites whose contents and origin cannot be verified are placed in a kind of default protection domain, the untrusted domain. The only restriction placed on the untrusted domain is that, given explicit confirmation from the user, it must allow MIDlets access to HTTP and HTTPS connections. The concept of protection domains is deliberately vague, leaving MIDP vendors with considerable latitude in their implementation.

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