bar code generator in c# The play() method creates and displays a PlayingScreen for the recorded media. in Objective-C

Creation Data Matrix ECC200 in Objective-C The play() method creates and displays a PlayingScreen for the recorded media.

The play() method creates and displays a PlayingScreen for the recorded media.
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private void play(String location, String message) { Screen playback = new PlayingScreen(location, message);
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CHAPTER 3: Media Playback
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UiApplication.getUiApplication().pushScreen(playback); } }
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Figure 3-11. MediaGrabber displaying a captured image in full-screen mode
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To show off the power of the new PlayingScreen, provide a way to directly enter it without going through RecordingScreen. Listing 3-4 shows how you can convert RecordingChoicesScreen from the previous chapter into ChoicesScreen. ChoicesScreen keeps the existing options for starting a record operation, but it also adds the ability to enter a file location or web URL and then select Play Media to launch it directly. Note that this will only play MMAPI-compatible media, so it will work for most audio and video, but not SVG, Plazmic, or other unsupported media types.
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CHAPTER 3: Media Playback
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Listing 3-4. A Screen to Start Recording or Playing a Particular File package com.apress.king.mediagrabber; import import import import import import import net.rim.device.api.ui.Field; net.rim.device.api.ui.MenuItem; net.rim.device.api.ui.UiApplication; net.rim.device.api.ui.component.BasicEditField; net.rim.device.api.ui.component.LabelField; net.rim.device.api.ui.component.Menu; net.rim.device.api.ui.container.MainScreen;
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public class ChoicesScreen extends MainScreen { private BasicEditField location = new BasicEditField("Location:", "file:///SDCard/BlackBerry", 100, Field.FIELD_VCENTER | BasicEditField.FILTER_URL); private MenuItem audioItem = new MenuItem("Record Sound", 0, 0) { public void run() { launchRecorder(RecordingScreen.RECORD_AUDIO); } }; private MenuItem pictureItem = new MenuItem("Take a Picture", 0, 0) { public void run() { launchRecorder(RecordingScreen.RECORD_PICTURE); } }; private MenuItem videoItem = new MenuItem("Record Video", 0, 0) { public void run() { launchRecorder(RecordingScreen.RECORD_VIDEO); } }; private MenuItem launchVideoItem = new MenuItem("Play Media", 0, 0) { public void run() { launchPlayer(); } }; public ChoicesScreen() { setTitle("MediaGrabber"); add(new LabelField( "Please enter a location, then select a choice from the menu.")); add(location); } public void close() {
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CHAPTER 3: Media Playback
location.setDirty(false); super.close(); } public void makeMenu(Menu menu, int instance) { if (instance == Menu.INSTANCE_DEFAULT) { String property = System.getProperty("supports.audio.capture"); if (property != null && property.equals("true")) { menu.add(audioItem); } property = System.getProperty("video.snapshot.encodings"); if (property != null && property.length() > 0) { menu.add(pictureItem); } property = System.getProperty("supports.video.capture"); if (property != null && property.equals("true")) { menu.add(videoItem); } menu.add(launchVideoItem); } super.makeMenu(menu, instance); } private void launchRecorder(int type) { String directory = location.getText(); RecordingScreen screen = new RecordingScreen(type, directory); UiApplication.getUiApplication().pushScreen(screen); } private void launchPlayer() { String url = location.getText(); PlayingScreen screen = new PlayingScreen(url, "Playing " + url); UiApplication.getUiApplication().pushScreen(screen); } public boolean onSavePrompt() { return true; } }
Updating MediaGrabber.java is trivial: simply rename RecordingChoicesScreen to ChoicesScreen. At this point, you will be able to build and run the latest incarnation of MediaGrabber. Give it a whirl! You ll want to run this on an actual device to get the best impact; the canned images and audio in the simulator leave a lot to be desired. Try recording whatever media your device supports, and also enter the URL for an external media file.
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CHAPTER 3: Media Playback
WANT MORE
Consider enhancing the app even more by adding these features: Save the most recently entered locations to allow quicker access. Allow the user to choose what audio device is used to play back sound. Write a new Screen that can be used to play back SVG or Plazmic content. It doesn t make sense to go overboard with this app after all, BlackBerry devices have a good Media application built in. However, these sorts of enhancements help a great deal when determining how feasible it is to add certain types of content into your own apps.
Excelsior
Phew! You covered a lot of ground in this chapter. As you can see, there s an incredibly wide range of options available for adding compelling media content to your BlackBerry application. Fortunately, no app is expected to use all of them. Depending on your needs, you will likely just choose one or two types of content, a couple of formats, and one or two methods of delivery. You might choose the MMAPI Player interface for maximum compatibility and control, or Plazmic for a high level of integration with BlackBerry, or some other solution that takes advantage of your existing resources and interest. After you have made your decision, you can safely ignore the other media options at least until it s time to create your next app. This chapter covered many ways of delivering content to the phone, including in your COD, on the filesystem, or over the Internet. However, there s an entire set of technologies that exist only for mobile phones and offer unparalleled ways to exchange information with other people. The next chapter will dive into the sea of wireless messaging and show you how to create an app that s unlike what you can create on the desktop.
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