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A Library Example
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Create a new Eclipse workspace and start a third project, this one called GoodbyeWorld. Follow the instructions in the previous section in this chapter titled A MIDlet Example, but this time select the Project Type Library and check the option for Auto-run on startup . Create a new class GoodbyeWorld with the default superclass of java.lang.Object. This particular library will be calling some privileged API methods, so we will notify the build environment that our app has the proper access. Select the Eclipse BlackBerry menu, then choose Configure BlackBerry Workspace. Click Code Signing in the left pane, and verify that all the options are checked. You should have RIM BlackBerry Apps API, RIM Crypto API, and RIM Runtime API selected. If you happen to know that you cannot access one or more of these, for example if you are in a region without permission to use the Crypto API, leave those options unchecked. The compiler will
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CHAPTER 1: Getting Started
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generate a warning if your code attempts to call these restricted methods. You will still be able to call them on the simulator, but they will fail on the device. Listing 1-3 shows this library s implementation. You ll notice a special entrance function called libMain(). Not every library needs one, but if Auto-run on startup is selected, then the system will run this method if it is available. In this example, we check to see if the HelloUniverse application is installed. If so, we wait for the device to finish booting up, and then launch it.
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Listing 1-3. A Basic Library package com.apress.king; import net.rim.device.api.system.*; public class GoodbyeWorld { public static void libMain(String[] args) { System.out.println("GoodbyeWorld launching"); int handle = CodeModuleManager.getModuleHandle("HelloUniverse"); ApplicationDescriptor[] descriptors = CodeModuleManager .getApplicationDescriptors(handle); if (descriptors.length > 0) { ApplicationDescriptor descriptor = descriptors[0]; try { ApplicationManager manager = ApplicationManager .getApplicationManager(); while (manager.inStartup()) { try { Thread.sleep(1000); } catch (InterruptedException ie) { // Ignore. } } manager.runApplication(descriptor); } catch (ApplicationManagerException e) { System.out.println("I couldn't launch it!"); e.printStackTrace(); } } else { System.out.println("HelloUniverse is not installed."); }
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CHAPTER 1: Getting Started
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System.out.println("Goodbye, world!"); } }
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When you run this in the simulator, you will see the same screen display as in Figure 1-5, but this time, no action on your part is necessary. Also, if you look in the Console view for the BlackBerry Simulator Output Console in Eclipse, you will see the message GoodbyeWorld launching included within the app startup messages.
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Library Evaluation
The possibilities for libraries are practically endless. They can enhance your other applications by providing useful utilities or running common tasks. They are especially useful when you have a portfolio of apps and want to share existing technology between them. That said, most applications don t use libraries, and most don t need them. Think carefully about what your library is supposed to accomplish, whether it s actually useful, and whether a library is the best place to put those functions. It might be fun to automatically start up an application, but many users would likely be annoyed by that behavior. Use your best judgment, and you may find situations where libraries are the best solution to a problem. The examples in this book do not use libraries often, but most of the code that does not have a UI component could be placed within a library.
Connecting to Files and Networks
Java ME introduced a new framework to the Java language. The Generic Connection Framework, or GCF, provides a generic mechanism for accessing many different kinds of resources that exist outside your app. The GCF will be used in all but the most trivial applications, whether you are building a MIDlet or a BlackBerry CLDC app.
A GCF Overview
The Connector class provides an entry into the GCF. Connector is a factory class one that is responsible for creating other objects. When you call Connector.open(), you provide a connection string describing the resource you want to access. Connection strings look like URLs, but can describe a wide variety of connection types. Examples include http://apress.com, sms://+14155550100 and file:///SDCard/BlackBerry/Music/. If the device supports the requested connection type, it will return an object that implements the appropriate subclass of Connection. Figure 1-6 shows the relationship between Connector and Connection, along with a few representative Connection types. If the device does not support a particular type of connection, Connector will throw a
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