This page has been updated on the 21 July 2010.
Information validated on 2.4.0 framework.
We are going to develop a little application which prints out “helloworld” in the log and on the screen.
Create a new “graphical interface component”
The purpose of the helloworld component is to understand the architecture of a project and the use of another component.
This will be done in several steps :
Create a user interface component called helloWorld with package name : com.training.helloWorld
A project made in the SDK has 3 main parts:
To learn more about project structure, please read Create and import a project
The JCPN file is an XML file which describes a component.
To learn more about JCPN, please read The JCPN File
The MDU file is an XML file which describes the graphical interface of a component.
To learn more about MDU, please read The MDU File
Debug dbg = Component.getInstance().getDebug(); MuiCommand muiCommand = Component.getInstance().getMuiCommand(); if (muiCommand != null) muiCommand.register(new BuffRef("com.training.helloworld"));
Now that we have the instance, we need to call the init() method if it takes parameters.
The init() method defines the debug level we will see.
[...] dbg.init(0); // initialize debug to see all log
And then we can use the debug methods.
[...] dbg.print("helloworld"); dbg.debug("helloworld"); dbg.warn("helloworld"); dbg.error("helloworld");
After that you can launch the simulation with helloworld inside and then you can see the following lines in the console :
2010-XX-XX XX:XX:XX L[j$com/training/helloWorld$0] helloworld 2010-XX-XX XX:XX:XX L[j$com/training/helloWorld$0] helloworld 2010-XX-XX XX:XX:XX L[j$com/training/helloWorld$0] helloworld 2010-XX-XX XX:XX:XX L[j$com/training/helloWorld$0] helloworld
Each call prints out the text in different colors and adds the package name at the beginning.