Adding Multimedia to Google Web Toolkit (GWT) Applications

Sep 14, 2010

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What Are the Options?

Let's consider options for adding sound to our application. Basically, we're somewhat limited: We can either go the HTML way by using appropriate tags, or the Flash way by embedding a short SWF file in our page and manipulating it in order to play the desired sound.

For compatibility reasons, we'd like to restrict ourselves to pure HTML, but that won't prove to be so easy because of differences between browsers. On the other hand, plenty of users routinely block Flash code (I'm one of them myself!), so going that way isn't surefire. Finally, you should also consider the format of your audio, because some users may not have the appropriate codecs or plug-ins, but this point is somewhat beyond our possibilities to fix.

We'll start by considering the HTML-based solution (and find ways of dealing with the different browsers' capabilities and requirements), and then try the Flash solution.

Some Tips for Your Project

Before going ahead with the following solutions, keep in mind some important details about your project structure and files, or you'll have difficulty testing and deploying your project:

Make sure that your HTML page document type declaration is <!DOCTYPE html>, so that it will be recognized properly as HTML5. (This declaration isn't really needed for HTML5 browsers, but older browsers require it. See the Wikipedia entry on Document Type Declaration for more on this topic.)
Place your sound files in the war output directory of your Eclipse project. I downloaded my sound files for this example free from several websites. (Check out the GWT "Compile & Debug" entries for more on directories and their contents for GWT projects.)
If you plan to test your application with both Linux and Windows, add -bindAddress 0.0.0.0 to the arguments in the Eclipse run configuration for your project; otherwise, you'll only be able to test your application in the development machine, and not across a network. (Check out the story of this issue here or here.)

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