Beginning Flash, Flex, And Air Development For Mobile Devices 2011
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.
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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. This helps minimize your app's memory footprint.
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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.
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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. How might you use this view data persistence mechanism? Well, you could use it to restore your view to a previous state.
More on this in the next section. The View class defines a property named data which is of type Object. The very first time a view is instantiated its data property has a value of null well, unless you've implemented application-level persistence, but we won't cover that here. So, your app will generally include a check to see if your view's data property is null and, if it is, creates the data structure you want to work with. Something like this:.
You can populate a view's data property with whatever data you want. The thing about the data property is that once it's populated it stays that way — ViewNavigator will persist the contents of a view's data property whenever the view is destroyed e. Because a view's data persists during an app's session and potentially across sessions one use of a view's data property is to maintain state. That's up to you, the framework just provides a persistence mechanism.
But clearly this isn't rocket science. Just fill data with whatever you need to restore state, and to complement this you include instantiation-time code that uses the contents of data to initialize fields to previous values, maybe makes use of Flex 4 states to restore appearance, etc. It's worth emphasizing that saving and restoring state is an important part of mobile app design. Remember, you're on a phone, and users sometimes navigate away from your app.
If they're gone long enough your app may be killed by the OS.
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Is there an issue in tracker that I can watch. Note that to pack IPA you need to have provisioning profile and personal certificate converted to P12 format. I just tried this, but it does not work. The version that you can download now is 4. Thanks Alexander. It seems there are quite some changes. Your email address will not be published. Notify me of followup comments via e-mail. You can also subscribe without commenting. Skip to content. New in Prerequisites Prepare your computer and Android 2.
Beginning Flash Flex and AIR Development for Mobile Devices
Enable USB debugging on the device. Download Flex SDK 4. Alternatively if you already have Flash Builder 4. In a few seconds the application will start on the device! Bookmark the permalink.