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What else do you need to keep in mind when designing your mobile application Obviously, the mobile device has a much smaller display than a desktop device. How do you need to change your application layout and interaction paradigms to accommodate this difference in user interaction Input methods are usually different for a mobile device. How will this impact your application design How does the environment affect how the user interacts with his device Is this application intended to be used when one-handed operation is critical Are you expecting the user to quickly check for a particular piece of information, or will the user be engaged in a protracted interaction Furthermore, the device is always on and always connected. Your application can be designed to send notifications to the user at odd times. Because the device is with the user all the time, he will get the notification at any time. The device demands instant interaction, so long wait times are not acceptable. The application needs a consistent style when interacting with the user. It can t force the user to do extra thinking or remember additional things. The mobile device should be an easy-to-use extension of daily life not a mandate to memorize different interaction methods. Finally, the device is extremely personal. A smartphone is typically used by a single individual and not shared. It should, therefore, be easy to customize and personalize. The mobile device can quickly become an extension of the user; an integral fashion accessory, it is now an inseparable element critical to his daily routine.

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Figure 3-5. Sample directory structure for the TechConf project The project s root directory is TechConf. Under this directory you ll place the project s main buildfile, named build.xml. The subdirectories under TechConf are organized as follows: lib: Contains any libraries required at runtime by the application(s) ant: Contains Ant macrodef in a single file, macros.xml src: The root directory for all non-generated sources src/java: The root directory for all non-J2EE Java sources src/test: The root directory for all test classes src/j2ee: The root directory for all J2EE source files

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There are technical considerations for mobile design as well Though mobile devices are similar in specifications to the desktops of yesterday, they are still not as powerful as today s desktops You must therefore keep an eye toward the limited resources available for mobile Memory, both dynamic and non-volatile (analogous to a PC s hard drive) are limited The CPU is also typically less powerful than that available on a desktop When designing your application, you must take these limited resources into account In choosing algorithms, try to select those that require less memory When designing data structures, avoid wasted memory It is critical to spend the extra time upfront to ensure your memory allocation is as efficient as possible You also need to design your application so that it can handle situations when such device resources as memory are low or exhausted.

Decide which technologies, programming languages, and tools to use Consider naming and coding conventions Create the basic structure of the web site and set up the database Implement an error-handling routine and a reporting routine in the site skeleton

Now that you have a suitable directory structure, your next step should be to start putting together the TechConf buildfile. The project element contains the name of your project and a nested description element.

The word design in the context of a web application can mean many things Its most popular usage probably refers to the visual and user interface design of a web site This aspect is crucial because, let s face it, the visitor is often more impressed with how a site looks and how easy it is to use than about which technologies and techniques are used behind the scenes or what operating system the web server is running If the site is slow, hard to use, or easy to forget, it just doesn t matter what rocket science was used to create it Unfortunately, this truth makes many inexperienced programmers underestimate the importance of the way the invisible part of the site is implemented the code, the database, and so on The visual part of a site gets visitors interested to begin with, but its functionality makes them come back.

Typically this is implemented by handling a signal or message from the system telling you that the system is out of resources When this happens, your application should make an attempt to free up resources by cleaning up any unnecessary memory usage You also need to handle the case where a forced application shutdown is imminent In this case, the application should save state if necessary and prepare to exit immediately Bandwidth is also limited on a mobile device When designing your application, be efficient about how data is requested over the network Request only the data you really need Can you prefetch data so that when the user accesses it, the download appears much faster than it actually is Additionally, you must code for corner cases not always present in the desktop world On a mobile device network, coverage is frequently lost and regained.

Best Practice Use the description element, which allows you to enter a detailed description of the project. This description is shown on the console when invoking Ant with the -projecthelp or -p command-line option.

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