The application is released across the major marketplaces targeting smartphones and tablets across Android, iOS and BlackBerry PlayBook. The topics of workflow, testing, development, and releasing the application will be discussed in detail. They'll be covering Lists, itemRenderers, and View transitions.
Come learn everything you'll need to know to get your app to peak performance. Explore the issues of moving an established RIA experience from desktop to mobile. Join Joseph Labrecque from the University of Denver as he discusses transitioning the viewing experience for a campus resource from desktop to mobile. This session will examine how to take advantage of new workflow considerations across Adobe toolsets and determine what existing functionality is suitable for mobile applications, investigate device restrictions that can impact the general user experience, and describe how to make users aware of a new mobile application and what to expect.
Learn new aspect-oriented programming AOP techniques for Flex development. This session begins with an overview of AOP fundamentals to demystify the terminology and advances to discussions on why ActionScript developers may want to utilize these new techniques. Discover the new AOP support in the wildly popular Swiz framework and how it aims to greatly reduce developer barriers by simplifying AOP.
Then look at some real examples to understand how AOP works in practice. You'll come away better prepared to embrace the industry-shifting paradigm change that mobile development promises.
Beginning: flash, flex, and air, development for mobile devices
Prepare to take the next step in multiscreen development. Review important considerations in planning multiscreen projects geared toward efficient code reuse and workflow. Also, see how to structure projects to match the strategy chosen to fit the application's use case. Once you have developed and debugged your application, you are ready to export it for real world consumption. The first thing you need to do is specify you applicaiton name, version and id in your app.
Be sure that these are the final values, as the application id will be the unique identifier for your application in all marketplaces and if you distribute the APK manually. Once your application configuration is finalized, you will be ready to actually export the project. For Android, you can use a purchased signing certificate, or use a self-signed certificate.
If you create your own certificate, the following window will be displayed. But this affects screen design: when buttons are 70px then x starts looking even smaller. Beyond sizing issues you also have some fundamental functionality differences. Different input methods is one: your desktop app that makes use of mouseOver won't work so well on a phone. And then there are the fun layout challenges that arise from re-orientation: most desktop apps never had to worry about users frequently flipping their screens between portrait and landscape. And then there's touch: it's a swipe-to-scroll world, so just kiss those old scrollBars good-bye Devnet has several excellent posts on this topic so let me mention a few here:.
- Adobe Had It Coming: The Long, Slow Goodbye of Mobile Flash.
- Beginning Flash, Flex, and AIR Development for Mobile Devices - Jermaine G. Anderson - Google книги;
- Model Theory.
- Explorations and Evangelism in Technology.
- Ultimate Journey (The Journeys Trilogy, Book 3).
Suffice to say that your UI design and app architecture for mobile will differ sometimes significantly from that of your traditional Flex apps. The 4. A lot of this involves data persistence and navigation. Flex 4.
The TabbedViewNavigatorApplication class lets you create more complex applications that have multiple sections, each with its own ViewNavigator, and buttons at the bottom of the screen that let you switch between these sections. I won't cover TabbedViewNavigatorApplication in this version of the primer but will add a section on it shortly. You define your UI in the views, not in your root class though you can put code in the root class.
- Reckless Road Guns n Roses and the Making of Appetite for Destruction;
- Cognitive Interfaces: Constraints on Linking Cognitive Information (Oxford Linguistics)?
- Nonviolent Resistance: A Philosophical Introduction.
- Product details.
- Product details.
Then at runtime you navigate between views using features of the new ViewNavigator class. ViewNavigatorApplication creates an instance of ViewNavigator for you and it is available to all views through their navigator property. The ViewNavigator itself creates an ActionBar instance that is shared by all views.
This actionBar is basically a container that can appear docked above your view and is commonly used for title or message text and option controls. As for defining your UI, for the preview release Adobe recommends use of a limited Spark component set currently only a subset of Spark components have been given mobile skins.
In fact, by default the mx controls are not even in the path no xmlns for mx. However, Adobe does say that if you want to include charts in your mobile app you can use the mx datavisualization controls. Again, for details see here or page 4 of the PDF. A mobile app's navigation between views is similar to that of mx:ViewStack, where you navigate between child containers with a single container active visible at a time.
One big difference is persistence: a ViewStacks's children persist once they've been created, but ViewNavigator keeps only one view in memory at a time. That is, garbage collection for views is essentially immediate — by default as soon as you move off a view it's a candidate for garbage collection. If you navigate back to that view you'll get a completely new instance.
Beginning Flash, Flex, and AIR Development for Mobile Devices » Let Me Read
This helps minimize your app's memory footprint. When you are coding a mobile app think memory, memory, memory. The threshold for encountering memory problems is much lower on a phone than on a PC. If you use too much memory Android may kill your app see my post AIR for Android memory issue with large images on this. If your app is in background and Android needs more memory it can also kill your app another reason you should maintain view and app state. A good intro into Flex mobile dev is the new Tour de Mobile Flex.
Install it from the Android marketplace and see this stuff in action, with source code provided. Every ViewNavigatorApplication has a ViewNavigator instance that provides much of your app's mobile-specific functionality. In addition to creating views and providing view navigation the navigator provides an optional and configurable ActionBar that can appear atop your view and can contain UI controls.
Below is a screencap that shows the layout of a basic mobile app. You have total control over what appears in these areas through properties of the View class. For example, View. But you can also put your own components in this area using the titleContent property.
See Define navigation, title, and action controls in a mobile application for details and several usage examples. Remember, you have total control over what displays in the actionBar or whether the actionBar displays at all. As noted above, a view is basically a container where you place your user interface controls and the code that drives them. What makes this container different from other Spark containers like Group and SkinnableContainer is that View has properties and methods specific to the Flex mobile architecture.
In essence it's a "ViewNavigator-aware" container. While a View is a container, in some ways it's like a very specific type of container, an ItemRenderer. In fact each view has a data property just like an item renderer. In the case of a view, it's up to you to populate that data property. We'll cover this in a minute, but first let's take a moment to consider the lifecycle of a view. A view will have a data property that can be used to represent the content and the state of the view.
This object is automatically serialized, persisted and restored by the view's navigator as the view is activated and deactivated". To keep memory use down ViewNavigator keeps only the currently displaying view in memory. In other words, when you navigate away from a view it is immediately eligible for garbage collection. So, if you navigate from ViewA to ViewB, by the time ViewB is displayed it no longer has ViewA available for reference presuming you have no pointers to ViewA that inhibit its garbage collection.
An obvious implication of this design is that time you can't directly set event listeners from one view to another; or have one view directly read another's data. Note that this auto-destruct behavior for inactive views is default. You can override it using View's destructionPolicy property but in general you shouldn't — remember: memory, memory, memory!
So, the contract here is that when you return to a view the previous contents of its data property will be available to you; your code can count on the data property being populated early in the instantiation process before the ADD event fires.