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HISMALLWORLD REVISITED USING MIDP FOR PALM OS
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From the File menu, select the Convert menu option and then select the JAD file describing the HiSmallWorld Midlet Suite, HiSmallWorld.jad. If everything is successful, results of the conversion should look similar to those pictured in figure 8.30. Then, the HiSmallWorld.prc is ready for deployment to the emulator and the Palm OS device.
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Figure 8.30 Results of attempting to convert a MIDP JAR/JAD file to a PRC file are displayed in the text area of the Convert Tool window.
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Deploying the MIDP for Palm OS applications Deploying the Midlet in HiSmallWorld.prc to either the POSE or the actual device is accomplished in the same manner as deploying any PRC file to the emulator or device. However, it is important to remember that the MIDP for the Palm OS PRC file will not run without the corresponding virtual machine. Therefore, remember to load both the application PRC as well as the MIDP.prc file if it is not already on the device. Because the MIDP virtual machine is a shared virtual machine, only the one VM (MIDP.prc) is required on each device to run any MIDP for Palm OS application. The MIDP.prc file can be found in the /PRCfiles subdirectory off the /midp4palm1.0 directory. When successfully deployed, the MIDP virtual machine and HiSmallWorld MIDlet suite should look similar to the picture in figure 8.31. The MIDP for Palm OS virtual machine shows up under the name JavaHQ on the Palm OS device.
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Figure 8.31 Unlike the Jbed applications, MIDP for Palm OS applications requires an underlying virtual machine. The virtual machine is in a PRC file and can be loaded independently of the MIDlet Suite PRCs. In this picture, the HiSmallWorld MIDlet Suite and MIDP for Palm OS VM are depicted on the device.
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And does the application look and behave the same way as the HiSmallWorld Midlet on the cell phone or pager in chapter 4 As can be seen from figure 8.32, the behavior is the same, while the display is slightly different based on the implementation of TextBox for Palm devices. Consider too that the MIDP was initially designed for cell 216
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phones and pagers. This then is considered one of the shortcomings of the MIDP, that its capabilities are limited to the lowest common denominator, which in terms of display, are cell phones and pagers.
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Figure 8.32 Running the HiSmallWorld MIDlet on the Palm OS device results in similar behavior as seen in the HiSmallWorld Spotlet developed with Jbed earlier. However, the user interface does have a little different look (see figure 8.26 for comparison).
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In this chapter, we explored some of the options available to Java and J2ME developers targeting PDA devices. Specifically, we have looked at two means to develop and deploy J2ME applications for the most popular PDA devices, those running Palm OS. KJava is a user interface and database API designed initially by Sun as a means to demonstrate and test the first CLDC and KVM implementations. The KJava API is not a J2ME Profile, but some vendors provide a supported implementation of this API for developing applications targeted for the Palm OS device. KJava offers a rich set of user interface and database capabilities to the CLDC for applications destined for Palm OS devices. In the next few chapters, we will explore the details of KJava in more detail. Specifically, we will examine KJava s user interface and the KJava Database class which wrappers the Palm OS database. An alternate approach must be sought if one is looking for an all J2ME environment. Therefore, we felt it important to at least introduce you to the MIDP for Palm OS. MIDP for Palm OS is a fully supported J2ME environment, although somewhat limited, for developing and deploying J2ME applications to the Palm OS. While both of these environments might suffice for application development in the short term, the J2ME community awaits a fully supported and rich environment, namely the PDA Profile, for developing PDA applications.
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