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Programming Java 2 micro edition on Symbian OS : a by Martin de Jode; Jonathan Allin; et al

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By Martin de Jode; Jonathan Allin; et al

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Extra info for Programming Java 2 micro edition on Symbian OS : a developer's guide to MIDP 2.0

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MIDlets are initialized when the AMS provides the initial class needed by CLDC to start the MIDlet. The AMS then guides the MIDlet through its various changes of state. We shall look at these states next. 1 MIDlet States Once a MIDlet has been instantiated, it resides in one of three possible states. A state is designed to ensure that the behavior of an application is consistent with the expectations of the end-users and device manufacturer. Initialization of the application should be short; it should be possible to put an application in a non-active state; and it should also be possible to destroy an application at any time.

The mobile UI needs to be more fluid and dynamic. Since much time has been spent by manufacturers testing out their devices on users, with focus groups, usability studies and other market research, it would be a waste to then expect users to learn another 30 GETTING STARTED method of entering and reading data from the device’s screen. Remember the inherited knowledge a PC user gains from using the PC user interface? Well, the same applies to a mobile UI. The implementation of each of the high-level UI components is therefore left to the devices themselves and as a result the MIDP GUI (known as the LCDUI) was designed to take into account the following: • a portable user interface • a consideration of the form factor of small devices, the size of the screen, the data input methods and the processor size: processing AWT objects and dealing with their garbage collection would not be appropriate for a constrained device • many people will use the devices while on the move or when not fully concentrating on the task in hand; many of the devices will be used with one hand, although some may use a pointing device • the UI of the applications should be comparable to the native applications on the device.

0, it was advised that the Displayable object was not truly visible until startApp() had returned. 0. setCurrent(Displayable) method can, therefore, be carried out at MIDlet initialization and put in the MIDlet constructor. This also alleviates any problems the developer may experience with unwanted re-initialization of the application and its display after resuming from the paused state. lcdui package implements an event model that runs across both the high- and low-level APIs. This handles such things as user interaction and calls to redraw the display.

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