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WAP is the protocol that small devices use to access the Internet. The principle of WAP is that your cell-phone provider makes available a gateway through which your phone can access the Internet. Since small screens make standard browser functions and standard HTML pages unusable on low-end devices, there s another markup language specially designed for cell phones and other small devices called Wireless Markup Language (WML). If your phone contract specifies WAP access and doesn t restrict browsing to some specific portal and sites, you can direct your phone to a WML page listing your MIDlets. From there you can download them. This is similar to a standard HTML web page embedding a Java applet. Many MIDP handsets are capable of loading simple HTML pages, but since the principle is the same, I ll give a WML page as an
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example. For an example of a corresponding HTML page for MIDlet download, look no further than your project s bin directory, where KToolbar generates an HTML page to go with the JAR and JAD it builds. To prepare your games for download, you first need to upload them onto a web server. You need to place the WML file on the server as well as the JAR and JAD files. In addition, you may have to perform some configuration so that the web server, when accessed, returns a correct Multipurpose Internet Mail Extensions (MIME) type description for those files. Otherwise, the phone may be unable to recognize them. The following sections explain these steps in detail using the Nokia 6100 as the example phone.
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You can use WML to display interesting content by itself, offering user interface (UI) elements such as forms, buttons, and so on. But you don t need to do anything fancy to make a page from which your game can be downloaded. In fact, it s better to resist the temptation to make a complex WML page because of the screen limitations of the target device. Try to keep it small and simple. Listing 1-4 shows a minimal example suitable for a download page. The file is called hello.wml. Listing 1-4. hello.wml < xml version="1.0" > <!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" "http://www.WAPforum.org/DTD/wml_1.1.xml"> <wml> <card id="hello"> <p> Hello world! </p> <p> <a href="hello.jad">Hello World App</a> </p> </card> </wml> Here s how it works: The first two lines are mandatory to identify the file as WML. The content of the page must be enclosed between the <wml> opening tag and the </wml> closing tag. The <card> tag delimits one screen of data for the device (not much!). As you may guess if you know some HTML or Extensible Markup Language (XML), this page will display one line containing the text Hello world! and another line with a link with the text Hello World App, as shown in Figure 1-5.
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Figure 1-5. The hello.wml WAP page running on the Nokia 6100 For this link to work, the server directory containing the file hello.wml must contain a JAR file called hello.jar and a JAD file called hello.jad. The page can contain multiple game links, and you add them in the obvious way. For example, inside the enclosing <card> tags, you could add a second triple such as the following: <p> <a href="maze.jad">Amazing Maze!</a> </p> on the lines immediately following these lines: <p> <a href="hello.jad">Hello World App</a> </p> (Obviously, you must also upload the corresponding JAR and JAD files to the server for this link.) But if you have a large number of downloadable JAR files, you ll probably want to arrange them on a series of separate pages. If you have multiple versions of the same game suite that are optimized for different devices, it s a good idea to make a separate WML page for each device rather than making a page for each game suite and having the page contain the versions for multiple devices. The standard technique for a professional game is to configure the server to return the page with links to the appropriate game versions based on the user-agent header sent by the handset when requesting the page (see the Identifying the Platform sidebar in 10). One word of warning: The <p></p> tags enclosing the links in the previous files aren t optional. In the case of the Nokia 6100, the device failed to recognize the links without the <p></p> tags.
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