MIDlet Suites in Java

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When MIDlets are delivered to devices for execution, they are packaged in a MIDlet suite MIDlet suites provide a controlled way of downloading multiple MIDlets onto a device as well as support controlled sharing of data and resources between multiple, possibly simultaneously running MIDlets MIDlet suites will be discussed in detail in 19, "MIDlet Deployment" [ Team LiB ]
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73 New for MIDP 20
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The MIDP application model has not changed since MIDP 10 However, the interactions with the user interface and the suggested application actions that are performed in these methods are now more precisely defined By limiting the complexity of functions performed in these methods, the application can be more responsive to both system requests and user actions [ Team LiB ]
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8 MIDP User Interface Libraries
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In light of the wide variations in cellular phones and other MIDP target devices, the requirements for user interface support are very challenging MIDP target devices differ from desktop systems in many ways, especially in how the user interacts with them The following UI-related requirements were seen as important when the user interface library of the MIDP Specification was designed: The devices and applications should be useful to users who are not necessarily experts in using computers
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The devices and applications should be useful in situations where the user cannot pay full attention to the application For example, many cellular phones and other wireless devices are commonly operated with one hand while the user is walking, cooking, fishing, and so forth
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The form factors and user interface concepts of MIDP target devices vary considerably between devices, especially compared to desktop systems For example, display sizes are much smaller, and input devices are much more limited or at least different Most mobile devices have only numeric keypads, and few have pointing devices such as pen-operated touch screens
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The Java applications for mobile information devices should have user interfaces that are consistent with the native applications so that the user finds them intuitive to use
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Given these requirements and the capabilities of devices that implement the MIDP (see Section 32, "Target Devices"), a dedicated user interface toolkit is provided in MIDP in the javaxmicroeditionlcdui package [ Team LiB ]
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81 MIDP UI Compared to Desktop AWT
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The differences between mobile devices and desktop computers are evident when comparing the designs of the MIDP lcdui with the Abstract Windowing Toolkit (AWT) of the JavaTM 2 Platform, Standard Edition
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AWT was designed and optimized for desktop computers The assumptions that are appropriate for desktop computers are not appropriate for mobile devices For example, when a user interacts with AWT, event objects are created dynamically These objects are short-lived and exist only until each associated event is processed by the system The event object then becomes garbage and must be reclaimed by the garbage collector of the Java virtual machine The limited CPU and memory subsystems of a mobile information device (MID) typically cannot afford the overhead of unnecessary garbage objects To limit the creation of such objects, lcdui events are simply method calls that pass the event parameters directly as the parameters of the method
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AWT also assumes certain desktop environment specific user interaction models For instance, the component set of AWT was designed to work with a pointing device such as a mouse or pen As mentioned earlier, this assumption is valid only for a small subset of MIDs, since most of the MIDP target devices have just a keypad for user input The MIDP user interface API uses a layer of abstraction to separate applications from concrete input methods used in different devices For example, a MIDP device with touch input allows the user to use this input method on high-level user interface components but it is not visible to applications The different concrete input methods are transparent to the application code
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AWT has extensive support for window management, such as overlapping windows, window resizing, and so forth In contrast, MIDP target devices have small displays that are not large enough for multiple overlapping windows The lcdui API of MIDP has no window management capabilities A lcdui user interface is constructed using a set of Displayables This displayable model and the class structure of user interface are described in the next section [ Team LiB ]
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