![]() The compilation batch file named 1-Compile.bat. Beginning of the top-level class for WTK001. Screen output produced by the runEmulator method. The cell phone emulator with the MIDlet running. The cell phone emulator with the MIDlet loaded. The screen output from making the JAR file. Typical screen output for preverification process. Typical screen output from deleteOldStuff method. Usage instructions for the preverify method. User interface for the framework program. I recommend that you open another copy of this document in a separate browser window and use the following links to easily find and view the figures and listings while you are reading about them. It was those articles that got me started down the path to learning about MIDlet programming. I would be remiss if I failed to mention the articles published by Vikram Goyal and others on this topic (see Resources). There is a wealth of information available on that topic on various web sites. I will leave it up to you to research the web and learn how to deploy a MIDlet into your particular brand and model number cell phone (see item 9). Therefore, the MIDlet-programming framework program that I will present cleans up after itself, automatically deleting all of the extraneous files that are created during the MIDlet development process, leaving only the source code files, the JAR file, and the JAD file. Together these two are called a MIDlet suite (see MIDlet Life Cycle in Resources). ![]() In the final analysis, only the JAR file and the JAD file are required to deploy the MIDlet into a cell phone. I will discuss items 1 and 2 in some detail in subsequent lessons.įuture lessons will update the MIDlet-programming framework to accommodate image files and other specialized file types as well. The Java framework program that I will present in this lesson handles items 3 through 8 in the above list with the single click of a button. Test the MIDlet in a cell phone emulator.Create a Java Application Descriptor (JAD) file.Compile the code (targeted to a Java v1.4 virtual machine, a specific version of the CLDC, and a specific version of the MIDP).Write the program code (similar to coding any Java program).Design the MIDlet (similar to designing any Java program).The following steps are required to produce a MIDlet and to get it running in a cell phone: In this first lesson, I will present some general background information about MIDlets and provide you with a Java programming framework that makes it easy to experiment with the programming of MIDlets. MIDlet applications are subclasses of the class that is defined by MIDP.” “A MIDlet is an application written for MIDP. Generally, these are games and applications that run on a cell phone.”Īccording to the SCMAD Certification Center (see Resources): “A MIDlet is a Java program for embedded devices, more specifically the Java ME virtual machine. In this series of lessons, I will start from scratch and help you work your way up to the point where you can write simple games and produce simple multimedia on cell phones. Stated more simply, the toolkit is used to create Java programs capable of running on small devices having limited resources such as cell phones. “The Sun Java Wireless Toolkit (formerly known as J2ME Wireless Toolkit) is a set of tools for creating Java applications that run on devices compliant with the Java Technology for the Wireless Industry (JTWI, JSR 185) specification and the Mobile Service Architecture (MSA, JSR 248) specification.” This is the first lesson in a series of tutorial lessons designed to teach you how to write programs using the Sun Java Wireless Toolkit for CLDC (Connected Limited Device Configuration.) According to Sun (see Resources): ![]() The framework program named WTKFramework01.
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