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9.1 9.2 9.3 9.4 9.5 9.6 9.7 KJava application control 219 The investment quote application control in KJava 220 KJava user interface 225 The investment quote application s user interface in KJava 240 Handling user interactions in KJava 248 Handling the events of the investment quote application in KJava Summary 261 250
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In the last chapter we introduced the KJava API. Because there is not yet a PDA Profile to be used with PDA devices, J2ME developers today are left with the choice of using MIDP for Palm OS or the KJava API. In this chapter, the KJava user interface and event handling mechanisms are covered in more depth. While not a valid J2ME profile, this API does at least extend the J2ME s CLDC and offers a basic set of user interface components and graphical drawing tools that allow for custom widgets to be developed if required. One thing to consider is that both KJava and MIDP for Palm OS only address one type of PDA device, those handhelds running the Palm OS. If you are already familiar with Java s Swing classes for developing stylish user interfaces in J2SE, you will probably not complain that KJava or any J2ME user interface API is too thorough an API. As you will see, KJava offers a very basic set of user interface components and a simple event handling mechanism. Nonetheless, it does offer a means to develop fairly sophisticated applications for the Palm OS device in Java. In particular, we hope to demonstrate some of its capabilities as we look to re-implement the tutorial application in KJava, starting with the user interface and event handling in this chapter. 218
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So, in this chapter we will revisit Spotlet application control explore the user interface widget set look at Spotlet event handling implement the tutorial application control and user interface in KJava by: developing the tutorial application control using KJava Spotlets. implementing the tutorial application s user interface displays using the Graphics object and KJava widget set developing the tutorial application s KJava event handling mechanism.
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As we did in chapter 8, we use Jbed to develop the KJava applications demonstrated in this chapter.
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A Spotlet serves as the central, controlling object in a KJava application. Its main purpose is to listen to events and provide relevant event processing methods. In most applications, the Spotlet class is extended and this extending class usually houses the static main method that serves as the entry or startup point for a KJava application. An application, however, can have multiple Spotlets, but only one Spotlet can have control to listen and react to events via event-handling methods at any given time. When a Spotlet is actively responding to events, it is said to have focus. Focus is obtained and released by a Spotlet through the methods register(int eventOptions) and unregister(). When a Spotlet is to gain focus, the register(int eventOptions) method is called. The eventOptions parameter can be one of two Spotlet static int values: NO_EVENT_OPTIONS or WANT_SYSTEM_KEYS. WANT_SYSTEM_KEYS signifies that the Spotlet should be notified and intends to handle system key selections. System keys on a Palm OS device include the four hard buttons at the bottom of the device which trigger the Calendar, Address Book, To Do List and Memo applications, as well as the Home, Menu, Calculator and Find soft keys around the Graffiti area of the device (see figure 9.1). System keys also include the device s power button as well as the HotSync button (which is located on the device s cradle). When registered with NO_EVENT_KEYS, the application only captures and reacts to page up and down keys as well as Graffiti input.
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Soft keys Figure 9.1 The Soft and Hard Keys on a Palm OS device allow for a user to quickly launch a Palm OS application such as the Calculator or Address Book. A Spotlet can be set up to be notified when one of these system keys is pushed.
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