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Getting Started with Java ME |
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To start with J2ME programming, first thing is to get our computer
setup for development work. The steps listed below will help in
building J2ME applications.
J2ME Development Tools.
Many
development environment are used to develop and debug J2ME
applications. J2ME Wireless Toolkit from Sun provides seamless
environment for developing MIDLet Suites. It can be used as standalone
or integrated with third party IDEs that provide support for J2ME.
Several cellphone manufacturers provide their own development
environments that can be used to develop and test MIDLets on their
devices.
J2ME Specifications.
Wireless
Toolkit 1.0 implementation is based on CLDC 1.0 and MIDP 1.0. Wireless
Toolkit 2.0 implementation is based on CLDC 1.0/1.1 and MIDP 2.0. Later
version supports backward compatibility and has many extra features. It
will be good idea to install later version as it also supports optional
JSR packages used for developing specific J2ME applications.
J2ME Emulators.
Wireless
Toolkit comes with few default emulators. Many cell phone manufacturers
produce their own device emulators that can be integrated with J2ME
development environments.
Developing MIDLet Suites.
Wireless Toolkit is based around projects, that contains all the source files and resources for MIDLets.
- Open Ktoolbar utility of wireless Toolkit.
- Create new porject.
- Supply
project name, which will be used to create new directory to contain all
of the project files, and MIDLet class name. By default the project
directory is created under %Install_dir%/apps/project_name, where install_dir is directory where Wireless toolkit is installed.
- Directory structure
bin
The
toolkit uses this directory to store the manifest file for the JAR into
which the MIDlet is packaged, the JAD file used to describe the MIDlet
suite, and the MIDlet suite's JAR file itself.
classes
Contains the compiled class files for the MIDlet suite after they have been preverifed.
src
source code for your MIDlets. res
Store resource files, such as images,that MIDlets in the MIDlet suite will need to access at runtime.
tmpclasses
It uses this directory to store compiled class files before they are preverified and copied into the classes directory.
lib
This
directory can be used to hold JAR and ZIP files containing classes that
are not part of the project you want to be incorporated when
compiling,running, and packaging the MIDlet suite.
tmplib
This
directory is used to hold copies of the JAR and ZIP files read from the
project lib directory, in which the class files have been converted to
their corresponding preverified forms.
- Build and Run MIDLet.
Books on J2ME Programming
References
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