By Jonathan Knudsen

The free up of MIDP 2.0 and the creation of the recent cellular carrier structure (MSA) are producing momentum for the Java ME platform. As a growing number of Java-enabled cellular units turn into to be had and extra carrier companies develop into open to third-party improvement, the call for for custom designed purposes will develop dramatically. Now, there is a functional, reasonable advisor to construction MIDP 2.0/MSA functions which are strong, responsive, maintainable, and fun.

Long-time Java ME writer Jonathan Knudsen bargains genuine ideas for the complicated demanding situations of coding potency, program layout, and value in limited cellular environments. skilled Java builders will grasp MIDP 2.0 and MSA programming via transparent, conscientiously designed examples. Downloadable code is out there for either NetBeans Mobility Pack and the sunlight Java instant Toolkit. Kicking Butt with MIDP and MSA 's wide-ranging content material covers:

  • Pushing MIDP's limits, and exploiting MSA's complete power
  • Using MIDlets, types, instructions, center sessions, and invocation
  • Building powerful cellular person interfaces
  • Designing pictures with the Canvas, the sport API, SVG, and 3D
  • Providing garage and assets: list shops, FileConnection, and PDA PIM
  • Internationalizing cellular applications
  • Networking through WMA, Bluetooth, internet prone, and SIP
  • Parsing XML documents
  • Implementing audio and complex multimedia
  • Securing cellular purposes with SATSA and the cost API
  • Building complex location-based applications
  • Designing purposes for a number of devices
  • Creating end-to-end cellular program architectures

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You'll also have a basic scaffolding upon which to build your later knowledge. Don't worry if it doesn't all make sense right away. Everything in this chapter is covered in more detail later in the book. Fire up your development tool of choice and type as you go along. By the end of this chapter you will have your first running MIDlet. 1. Make Something That Runs Phones and other MIDP devices know how to run MIDlets. A MIDlet is an application. MIDlet. MIDlet has three methods that must be defined in subclasses: • startApp() is called to initialize the MIDlet or to resume a paused MIDlet.

To save space, the palette of streams in MIDP/CLDC is reduced to essentials. In particular, MIDP/CLDC does not contain more elaborate or exotic streams like PushbackReader, PipedWriter, and LineNumberOutputStream. io package, streams are fundamental to any type of input or output in MIDP/CLDC applications. Streams are used for reading and writing data over HTTP, IP, Bluetooth, and other types of network connections. Streams are used to exchange data with local file systems when they are available.

Section II: The Lives of MIDlets 51 52 Section II: The Lives of MIDlets The connection strings returned by listConnections() tell only part of the story. They are the registered incoming connections for the entire MIDlet suite. If you want to find out the specific MIDlet class name and allowed senders, pass the connection string to getMIDlet() and getFilter() respectively. 4. A Push Registry Example PushyMIDlet shows how to register and unregister with the push registry. length > 0) { // We know there should be only one.

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