BlackBerry Concepts

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Development Environment for BlackBerry Applications using Java

This is a practical introduction of steps for building a BlackBerry apps using Eclipse IDE. (Alan Wong - January 13, 2011).

Steps	Actions
	Install, Configuration, Check
	BlackBerry Java Plug-in for Eclipse
	The goals of the Project is to create an Application that: run the application by adding it to the event dispatcher create a Screen and push it onto the Screen stack specify the title of a Screen display text on the screen using a RichTextField display a dialog box when the user closes the application

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Configuring the Project

Steps	Actions
	<Properties ModelVersion="1.1.2"> <General Title="Hello World Demo" Version="0.9" Vendor="Research In Motion Ltd." Description=""/> <Application Type="BlackBerry Application" MainMIDletName="" MainArgs="" HomeScreenPosition="0" StartupTier="7" IsSystemModule="false" IsAutostartup="false"/> <Resources hasTitleResource="false" TitleResourceBundleName="" TitleResourceBundleRelativePath="" TitleResourceBundleClassName="" TitleResourceBundleKey="" DescriptionId=""> <Icons> <Icon CanonicalFileName="res\img\helloworld_jde.png" IsFocus="false"/> </Icons> </Resources> <Compile OutputCompilerMessages="false" ConvertImages="true" CreateWarningForNoExportedRoutine="true" CompressResources="false"> <PreprocessorDefines/> </Compile> <Packaging OutputFileName="HelloWorldDemo" OutputFolder="deliverables" PreBuildStep="" PostBuildStep="" CleanStep="" GenerateALXFile="true"> <AlxFiles/> </Packaging> <HiddenProperties> <ClassProtection/> <PackageProtection/> </HiddenProperties> <AlternateEntryPoints/> </Properties>
	This class extends the UiApplication class, providing a graphical user interface.
	UiApplication Base class for all device applications that provide a user interface. A UI application maintains a stack of Screen objects. As it pushes screens onto the stack, it draws them on top of any other screens already on the stack. When the application pops a screen off the stack, it redraws the underlying screens as necessary. Only the screen on the top of the stack receives input events. Each screen may appear only once in the display stack. The application throws a runtime exception if you attempt to push a single screen onto the stack more than once. Note that a UI application must follow rules similar to those of traditional Swing applications.