BlackBerry Concepts

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BlackBerry Development Fundamentals using Eclipse IDE

This is a practical introduction to build BlackBerry applications.

(modified based on Alan Wong - January 13, 2011 presentation).

Steps	Actions
	The steps to install, configure and check your installation are defined at: Install, Configuration, Check
	One can download the software for developing BlackBerry applications using Eclipse from: BlackBerry Java Plug-in for Eclipse Note: You have to register as a developer prior to downloading process
	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

<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.

Development Fundamentals

Steps	Actions
	Package net.rim.device.api.ui Provides fundamental functionality for constructing the user interface of a RIM Device application. The members of this package are all abstract classes or interfaces They are not intended for direct instantiation. You should rather use (or extend) the classes in net.rim.device.api.ui.component and net.rim.device.api.ui.container. import net.rim.device.api.ui.UiApplication; /** * This class extends the UiApplication class, providing a graphical user * interface. / public class HelloWorldDemo extends UiApplication { /*
	There are three main UI primitives: Field Manager Screen Screen class is the base class for all screens. Each UiEngine presents an interface to the user by pushing screens onto its display stack, and popping them off when interaction with the managed fields on that screen is finished. Delegate manager Each screen object has a delegate manager, the single Manager object directly controlled by the screen to handle layout and scrolling for the entire screen.
	enterEventDispatcher The thread that calls this method (typically the main thread in the application) becomes theevent-dispatching thread, which will execute all drawing and event-handling code. Note: under normal circumstances this method does not return. public class HelloWorldDemo extends UiApplication { /** * Entry point for application * @param args Command line arguments (not used) */ public static void main(String[] args) { // Create a new instance of the application and make the currently // running thread the application's event dispatch thread. HelloWorldDemo theApp = new HelloWorldDemo(); theApp.enterEventDispatcher();
	Class MainScreen The MainScreen class defines the full screen providing features common to standard RIM device applications. /** * A class extending the MainScreen class, which provides default standard * behavior for BlackBerry GUI applications. */ final class HelloWorldScreen extends MainScreen {
	Main screen objects could contain: a title section, a separator element, and a main scrollable section. final class HelloWorldScreen extends MainScreen { /** * Creates a new HelloWorldScreen object */ HelloWorldScreen() { // Set the displayed title of the screen setTitle("Eclipse Course");