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CHAPTER 1: Getting Started
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because the server is unresponsive or a network connection has quietly dropped. It s a good practice to request the timeout notification so you can display an error to the user. An example of requesting a connection with a timeout follows. The final true parameter indicates that we want to receive an exception if the connection is not successfully opened in a timely manner.
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HttpConnection conn = (HttpConnection) Connector.open( "http://www.cia.gov;deviceside=true", Connector.READ, true);
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Once you have an HttpConnection, you can choose to set the request method (GET, POST, or HEAD) by calling setRequestMethod(), and specify any custom headers (such as the User-Agent or accepts) by calling setRequestProperty(). Once the connection is set up and you are ready to send or receive data, open the corresponding stream type and begin using it. All the same rules that applied to FileConnection objects also apply here: run within a separate thread, be prepared for errors, and clean up after yourself when done.
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App: Media Grabber
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You now know enough essentials to create a functional BlackBerry app. Throughout this book we will be building a media-sharing application through examples at the end of every chapter. This first chapter will concentrate on building up the framework of the app and giving you practice with running and debugging it. In the process, we ll also use some of the features covered in this chapter.
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Follow the instructions from earlier in this chapter to start a new Eclipse workspace and create a new BlackBerry CLDC application called MediaGrabber. Within that project, create a class called MediaGrabber that extends UiApplication. We ll write a static main() function that starts running the app, a simple UI to display, and a custom thread that uses the GCF to download a file and compare it to the local filesystem. Listing 1-4 shows the complete class.
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Listing 1-4. An App that Grabs and Stores Data from the Internet package com.apress.king; import import import import java.io.IOException; java.io.InputStream; java.io.OutputStream; java.util.Date;
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import javax.microedition.io.Connector; import javax.microedition.io.HttpConnection; import javax.microedition.io.file.FileConnection; import net.rim.device.api.ui.UiApplication; import net.rim.device.api.ui.component.LabelField;
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CHAPTER 1: Getting Started
import net.rim.device.api.ui.container.MainScreen; import net.rim.device.api.util.Arrays; public class MediaGrabber extends UiApplication { public static void main(String[] args) { MediaGrabber app = new MediaGrabber(); app.begin(); } public void begin() { MainScreen s = new MainScreen(); LabelField label = new LabelField("Kilroy Was Here"); s.add(label); pushScreen(s); (new WebChecker()).start(); enterEventDispatcher(); } private class WebChecker extends Thread { public void run() { HttpConnection http = null; FileConnection file = null; InputStream is = null; OutputStream os = null; try { http = (HttpConnection) Connector.open( "http://www.google.com;deviceside=true", Connector.READ_WRITE, true); is = http.openInputStream(); // Read the first 4 kilobytes. byte[] networkBuffer = new byte[4096]; is.read(networkBuffer); is.close(); http.close(); file = (FileConnection) Connector .open("file:///store/home/user/last.html"); if (file.exists()) { System.out.println("We last checked Google on " + new Date(file.lastModified())); byte[] fileBuffer = new byte[4096]; is = file.openInputStream(); is.read(fileBuffer); is.close(); if (Arrays.equals(networkBuffer, fileBuffer)) { System.out.println("Google hasn't changed."); } else
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CHAPTER 1: Getting Started
{ System.out.println("Google's doing something new."); } file.delete(); } else { System.out.println("Looks like the first time we've run!"); } file.create(); os = file.openOutputStream(); os.write(networkBuffer); } catch (IOException ioe) { System.err.println("An I/O error occurred: " + ioe); } catch (Exception e) { System.err.println("An unexpected error occurred: " + e); } finally { try { if (os != null) os.close(); if (file != null) file.close(); if (is != null) is.close(); if (http != null) http.close(); } catch (Exception e) { // Ignore } } } } }
Debugging on the Simulator
Because this is the first app to write that requires network support, an extra step is necessary before running. Click on Run, then Debug Configurations. Click on the BlackBerry Simulator entry, and click the new launch configuration icon in the upper left. A new configuration will display. Name it what you like, such as MediaGrabber BlackBerry. Click the Simulator tab and change the Profile from Default Simulator to one of the other choices. Mark the checkbox by the message that starts with Launch
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