BlackBerry Concepts

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Revision as of 00:45, 22 February 2011 by Jordan.anastasiade (talk | contribs) (/* Configuring the Project UI)
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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
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Install, Configuration, Check
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BlackBerry Java Plug-in for Eclipse
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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

Configuring the Project

Steps Actions
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<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>
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This class extends the UiApplication class, providing a graphical user interface.
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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.