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<li class="SiteHeaderPanelLink"><a href="/solutions/social-marketing.html?promoid=JZPNO" id="BusinessSolutions_Bybusinessneed_Socialmarketing">Social marketing</a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/testing-targeting.html?promoid=KAXLU" id="BusinessSolutions_Bybusinessneed_Testingandtargeting">Testing and targeting</a></li>
<li class="SiteHeaderPanelLink"><a href="/products/creativecloud/video.html?promoid=KAUDD" id="BusinessSolutions_Bybusinessneed_Videoeditingandserving">Video editing and serving</a></li>
<li class="SiteHeaderPanelLink"><a href="http://html.adobe.com?promoid=JZEFF" target="_blank" class="SiteHeaderLinkNewWindow" id="BusinessSolutions_Bybusinessneed_Webdevelopment">Web <span class="SiteHeaderIconNewWindowNoWrap">development<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/web-experience-management.html?promoid=JOOYM" id="BusinessSolutions_Bybusinessneed_Webexperiencemanagement">Web experience management</a></li>
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<ul class="SiteHeaderPanelLinkNoBottom">
<li class="SiteHeaderPanelLink"><a href="/solutions.html?promoid=JOOTI" id="BusinessSolutions_Seeallbusinessneeds">See all business needs</a></li>
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<div class="SiteHeaderColumn-2">
<p class="SiteHeaderPanelHeaderSmall">By industry</p>
<ul>
<li class="SiteHeaderPanelLink"><a href="/solutions/broadcasting.html?promoid=JOLIY" id="BusinessSolutions_Byindustry_Broadcast">Broadcast</a></li>
<li class="SiteHeaderPanelLink"><a href="/education.html?marketSegment=EDU&promoid=JOLIZ" id="BusinessSolutions_Byindustry_Education">Education</a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/financial-services.html?promoid=KAUDE" id="BusinessSolutions_Byindustry_Financialservices">Financial services</a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/government.html?promoid=KAUDF" id="BusinessSolutions_Byindustry_Government">Government</a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/digital-publishing.html?promoid=KAUDG" id="BusinessSolutions_Byindustry_Publishing">Publishing</a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/retail.html?promoid=KAWSD" id="BusinessSolutions_Byindustry_Retail">Retail</a></li>
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<ul class="SiteHeaderPanelLinkNoBottom">
<li class="SiteHeaderPanelLink"><a href="/solutions.html?promoid=KAUDH" id="BusinessSolutions_Seeallindustries">See all industries</a></li>
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</div>
</div>
</div>
<div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shSupportLearning">
<a href="http://helpx.adobe.com/support/?promoid=KAWQK" id="shSupportLearningLink" class="SiteHeaderBarLink">Support &amp; Learning</a>
<div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="SupportLearningPanel">
<div class="SiteHeaderRow">
<p class="SiteHeaderPanelHeaderSmall">I need help</p>
<ul>
<li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/support/?promoid=JZEFP" id="SupportLearning_Ineedhelp_Products">Products</a></li>
<li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/creative-cloud/topics/getting-started.html?promoid=JZEFO" id="SupportLearning_Ineedhelp_AdobeCreativeCloud">Adobe Creative Cloud</a></li>
<li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/marketing-cloud.html?promoid=KAWSE" id="SupportLearning_Ineedhelp_AdobeMarketingCloud">Adobe Marketing Cloud</a></li>
<li class="SiteHeaderPanelLink"><a href="http://forums.adobe.com/index.jspa?promoid=JZEFM" target="_blank" id="SupportLearning_Ineedhelp_Forums"><span class="SiteHeaderIconNewWindowNoWrap">Forums<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
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<p class="SiteHeaderPanelHeaderSmall">I want to learn</p>
<ul class="SiteHeaderPanelLinkNoBottom">
<li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/learning.html?promoid=KAUDK" id="SupportLearning_Iwanttolearn_Trainingandtutorials">Training and tutorials</a></li>
<li class="SiteHeaderPanelLink"><a href="http://training.adobe.com/certification.html?promoid=KAUDM" target="_blank" id="SupportLearning_Iwanttolearn_Certification"><span class="SiteHeaderIconNewWindowNoWrap">Certification<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
<li class="SiteHeaderPanelLink"><a href="/devnet.html?promoid=KAUDN" id="SupportLearning_Iwanttolearn_AdobeDeveloperConnection">Adobe Developer Connection</a></li>
<li class="SiteHeaderPanelLink"><a href="/designcenter.html?promoid=KAUDO" id="SupportLearning_Iwanttolearn_AdobeDesignCenter">Adobe Design Center</a></li>
<li class="SiteHeaderPanelLink"><a href="http://tv.adobe.com?promoid=KFELF" target="_blank" id="SupportLearning_Iwanttolearn_AdobeTV">Adobe <span class="SiteHeaderIconNewWindowNoWrap">TV<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
<li class="SiteHeaderPanelLink"><a href="/solutions/digital-marketing/guides.html?promoid=KAWSF" id="SupportLearning_Iwanttolearn_AdobeMarketingCenter">Adobe Marketing Center</a></li>
<li class="SiteHeaderPanelLink"><a href="http://labs.adobe.com/?promoid=JZEFQ" target="_blank" id="SupportLearning_Iwanttolearn_AdobeLabs">Adobe <span class="SiteHeaderIconNewWindowNoWrap">Labs<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
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<div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shDownload">
<a href="/downloads/?promoid=KAWQL" id="shDownloadLink" class="SiteHeaderBarLink">Download</a>
<div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="DownloadPanel">
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<li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/flashplayer/?promoid=JZEFT" id="Download_AdobeFlashPlayer">Adobe Flash Player</a></li>
<li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/reader/?promoid=JZEFU" id="Download_AdobeReader">Adobe Reader</a></li>
<li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/air/?promoid=JZEFV" id="Download_AdobeAIR">Adobe AIR</a></li>
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<div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shCompany">
<a href="/company.html?promoid=KAWQM" id="shCompanyLink" class="SiteHeaderBarLink">Company</a>
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<li class="SiteHeaderPanelLink"><a href="/aboutadobe/invrelations/?promoid=JZEFZ" id="Company_InvestorRelations">Investor Relations</a></li>
<li class="SiteHeaderPanelLink"><a href="/aboutadobe/pressroom/?promoid=JZEGA" id="Company_Newsroom">Newsroom</a></li>
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<div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shBuy">
<a href="/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_software_sl_mostpopular.html?promoid=KAWQN" id="shBuyLink" class="SiteHeaderBarLink">Buy</a>
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<li class="SiteHeaderPanelLink"><a href="/products/catalog/software.html?marketSegment=COM&promoid=KAWQO" id="Buy_Forpersonalandprofessionaluse">For personal and professional use</a></li>
<li class="SiteHeaderPanelLink"><a href="/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_education_sl_alledu.html?marketSegment=EDU&promoid=KAWQP" id="Buy_Forstudentseducatorsandstaff">For students, educators, and staff</a></li>
<li class="SiteHeaderPanelLink"><a href="/products/small-business-pricing/software-catalog._sl_id-contentfilter_sl_catalog_sl_software_sl_creativecloudmembership.html?marketSegment=COM&promoid=JOLJE" id="Buy_Forsmallandmediumbusinesses">For small and medium businesses</a></li>
<li class="SiteHeaderPanelLink"><a href="/volume-licensing.html?promoid=KAWQQ" id="Buy_VolumeLicensing">Volume Licensing</a></li>
<li class="SiteHeaderPanelLink"><a href="/products/discount-software-coupons.html?promoid=KAWQR" id="Buy_Specialoffers">Special offers</a></li>
<li class="SiteHeaderPanelLink"><a href="http://success.adobe.com/en/na/programs/rfi/dm_sales_inquiries.html?promoid=KAWSG" target="_blank" id="Buy_AdobeMarketingCloudsales">Adobe Marketing Cloud <span class="SiteHeaderIconNewWindowNoWrap">sales<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
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<a id="shInfo" class="SiteHeaderUserItem SiteHeaderInfo">Info</a>
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<span class="SiteHeaderPanelHeader">Why sign in?</span>
Sign in to manage your account and access trial downloads, product extensions, community areas, and more.
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<div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyAccount">
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<a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_mypreferences_en_us">My preferences</a>
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<div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyProductsServices">
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<a href="/privacy.html" id="shPrivacy" class="SiteHeaderUserItem">Privacy</a>
<a href="/go/gnav_myadobe_en_us" id="shMyAdobe" class="SiteHeaderUserItem">My Adobe</a>
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<span class="SiteHeaderBarItemMobile" id="shSectionsMobileSpan"><a href="#" id="shSectionsMobile" class="SiteHeaderArrowMobile SiteHeaderBarLink">Sections</a></span>
<span class="SiteHeaderBarItemMobile" id="shSectionsMobileBuy"><a href="/go/gnav_store_en_us" id="shBuyMobile" class="SiteHeaderBarLink">Buy</a></span>
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<div class="SiteHeaderUser">
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<a href="/privacy.html" id="shPrivacyMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile">Privacy</a>
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Flex Developer Center</a>
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Flex mobile development tips and tricks – Part 1: Data handling</h1>
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by&nbsp;<a href="/devnet/author_bios/holly_schinsky.html">Holly Schinsky</a></h2>
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Using the destructionPolicy attribute to handle data between views</a>
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Using the data property to handle data between views</a>
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Persisting data between application executions</a>
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Where to go from here</a>
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<p>29 August 2011</p>
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<p>This is Part 1 of a multipart series of articles that cover tips and tricks for <a href="/devnet/flex/testdrivemobile.html">Flex mobile development</a>. If you are used to desktop and web programming, you'll find that developing mobile applications presents a new set of challenges. In addition to rethinking your strategies for data persistence and handling, you'll need to take into account screen size and resolution and make trade-offs to manage performance and battery drain. This series of articles will help ease the transition into mobile development by presenting techniques for overcoming these new development challenges.</p>
<p>Handling data is one aspect of mobile development that requires traditional application developers to adopt a different way of thinking. For instance, for many mobile applications it is important to persist (store) data when the user closes or switches away from the application, when an incoming call is received, or when the application is forced to shut down for some other reason. In addition, mobile application <b><i>Views</i></b> are destroyed and recreated often. As a result you'll need to think about how to handle your data between views. So, the two main scenarios in which you need to save data are:</p>
<ul>
<li>Between application executions (that is, when closing and restarting the application)</li>
<li>Between views within your application</li>
</ul>
<p>This article covers several ways of handling these scenarios.</p>
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Using the destructionPolicy attribute to handle data between views</h3>
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<p>Before diving into the different ways to handle saving data while navigating between views, it's important to understand the <b>View</b> life cycle. In Flex 4.5, only one View is active at any given time. By default, all other Views will be destroyed and recreated when needed. This behavior is controlled by the <code>destructionPolicy</code> property on the View class, which is set to <code>auto</code> by default. If you set the value of this property to <code>never</code> , the View will be cached and hold its state until it is reactivated via a call to <code>navigator.popView()</code> . </p>
<p>Consider the diagram shown in Figure 1. By default (or when you explicitly set <code>destructionPolicy=&quot;auto&quot;</code> ), View A will be destroyed when View B is pushed onto the stack, and View B will be destroyed when View C is pushed onto the stack. View A and View B will be recreated each time the view above it in the stack is popped off. When you set <code>destructionPolicy=&quot;never&quot;</code> on View A and View B, those views will be deactivated and cached, but not destroyed, when a new view is pushed. Later, when the view above them is popped, they will simply be activated.</p>
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<img title="Figure 1. Creating and destroying views in Flex 4.5." alt="Figure 1. Creating and destroying views in Flex 4.5." class="cq-dd-image LayoutImage LayoutRow " src="devnet/flex/articles/flex-mobile-development-tips-tricks-pt1/fig01.jpg"/></div>
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Figure 1. Creating and destroying views in Flex 4.5.</div>
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<p>Note that even if you set <code>destructionProperty=&quot;never&quot;</code> on a View, it will still be recreated if you invoke <code>pushView()</code> to show it again. The caching only works when the View above is popped off the stack to reveal a previous view. Consider the diagram in Figure 2. When View B is pushed for the second time, it will be recreated and no data from the previous showing will be accessible (unless you use another method to persist and retrieve the data).</p>
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<img title="Figure 2. Pushing View B for the second time will cause the View to be recreated." alt="Figure 2. Pushing View B for the second time will cause the View to be recreated." class="cq-dd-image LayoutImage LayoutRow " src="devnet/flex/articles/flex-mobile-development-tips-tricks-pt1/fig02.jpg"/></div>
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Figure 2. Pushing View B for the second time will cause the View to be recreated.</div>
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<p>I created a simple application that starts in View 1 and invokes <code>pushView()</code> to activate View 2. The normal order of events that occur by default (without setting the <code>destructionPolicy</code> property) can be seen in the following trace statements that I inserted in my application:</p>
<ol>
<li>View 1 being removed in response to screen change ( <code>removing</code> event)</li>
<li>View 2 added to display list ( <code>added</code> event)</li>
<li>View 2 add event ( <code>add</code> event)</li>
<li>View 2 creation complete ( <code>creationComplete</code> event)</li>
<li>View 1 deactivated ( <code>viewDeactivate</code> event)</li>
<li>View 1 is being removed from display list ( <code>removed</code> event)</li>
<li>View 2 activated ( <code>viewActivate</code> event)</li>
</ol>
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<a id="articlecontentAdobe_numberedheader_0"></a>
Using the data property to handle data between views</h3>
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<p>Another (and in my opinion more intuitive) option for saving data between views is to use the <code>data</code> property on the View object. This property will save the state of the data in memory so when you return to your View via a push or pop it can be accessed. You can set any type of object on the <code>data</code> property, including a custom class. In the Person class example shown below, the <code>data</code> property is set to a value object. Note that the <code>data</code> property in the view is instantiated and ready before the View is shown so you don't have to worry about it being available. </p>
<p>You can also return data from a popped view by overriding the <code>createReturnObject()</code> method on the View. If your app is showing View A and you push View B, you can then return data from View B to View A by overriding <code>createReturnObject()</code> in View B; for example:</p>
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<code class="CodeBlock">override public function createReturnObject():Object
{
return person;
}
</code>
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<p>In this example, <code>person</code> is an instance of a class I have defined in ActionScript:</p>
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<code class="CodeBlock">package model
{
[Bindable]
public class Person
{
public var person_id:int;
public var userid:String;
public var password:String;
public var fname:String;
public var lname:String;
public var city:String;
}
}
</code>
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<p>Once back in View A, you can access the returned object using:</p>
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<code class="CodeBlock">data = navigator.poppedViewReturnedObject.object;</code>
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<p>Since the object type is actually <b>ViewReturnObject</b>, you have to specify the <code>object</code> property to get the value.</p>
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<a id="articlecontentAdobe_numberedheader_1"></a>
Persisting data between application executions</h3>
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<p>You have several options for persisting your data between application executions, so that the data is available when the application is restarted after it has been shut down. Flex 4.5 has a built-in persistence mechanism that is accessed via a property named <code>persistNavigatorState</code> on <b>ViewNavigatorApplication</b> or <b>TabbedViewNavigatorApplication</b>. After you set <code>persistNavigatorState</code> to <code>true</code> to enable this mechanism, you can listen for the <code>navigatorStateLoading</code> and <code>navigatorStateSaving</code> events, and perform any handling needed when those events occur. If you want to develop your own custom persistence method, you can call <code>preventDefault()</code> in the events handler. </p>
<p>When using this technique, your root application tag would look something like the following:</p>
</div>
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<code class="CodeBlock">&lt;?xml version=”1.0” encoding=&#034;utf-8&#034;?&gt;
&lt;s:ViewNavigatorApplication xmlns:fx=&#034;http://ns.adobe.com/mxml/2009&#034;
xmlns:s=&#034;library://ns.adobe.com/flex/spark&#034; firstView=&#034;views.SampleDataPersistenceHomeView&#034; firstViewData=&#034;{person}&#034;
persistNavigatorState=&#034;true&#034; navigatorStateSaving=&#034;onStateSave(event)&#034;
navigatorStateLoading=&#034;onStateLoad(event)&#034; &gt;
</code>
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<code class="CodeBlock">/Applications/Adobe Flash Builder 4.5/sdks/4.5/frameworks/projects/mobilecomponents/src/spark/managers</code>
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<p>When you set <code>persistNavigatorState=&quot;true&quot;</code> , your application will automatically save the state of its Views and data to a local shared object with the name FXAppCache. If you look at the <b>PersistenceManager.as</b> source code from the Flex 4.5 SDK (on my Mac this file is found under <kbd>/Applications/Adobe Flash Builder 4.5/sdks/4.5/frameworks/projects/mobilecomponents/src/spark/managers</kbd>), you will see how this variable is created:</p>
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<p>After running your application in the Flash Builder emulator you can look at what was saved by locating the local shared object on your hard drive. On my Mac, the path to the file is: </p>
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<code class="CodeBlock">/Users/hollyschinsky/Library/Preferences/DataPersistence.debug/Local Store/#SharedObjects/DataPersistence.swf/FXAppCache.sol. </code>
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<img title="Figure 3. Persisted data in the FXAppCache local shared object." alt="Figure 3. Persisted data in the FXAppCache local shared object." class="cq-dd-image LayoutImage LayoutRow " src="devnet/flex/articles/flex-mobile-development-tips-tricks-pt1/fig03.jpg"/></div>
<div class="TextSmall LayoutCellSides LayoutRowTop LayoutBigRowBottom">
Figure 3. Persisted data in the FXAppCache local shared object.</div>
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<p>If you need to persist a custom class, such as the <b>Person</b> class in the example above, you'll have to listen for the <code>preinitialize</code> event in the main application and register the class alias; for example:</p>
</div>
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<code class="CodeBlock">protected function viewnavigatorapplication1_preinitializeHandler(event:FlexEvent):void
{
flash.net.registerClassAlias(&#034;person&#034;,model.Person);
}
</code>
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<p>Your data will automatically persist when you simply set the <code>persistNavigatorState</code> property to <code>true</code> , but if you would like to add more properties or access the persistence manager, you can do so by using the<b> ViewNavigatorApplication</b> or <b>TabbedViewNavigatorApplication</b><i> </i><i>persistenceManager</i> object; for example:</p>
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<code class="CodeBlock">persistenceManager.setProperty(&#034;hollysProp&#034;,&#034;myProperty&#034;); // set my own custom property
persistenceManager.getProperty(&#034;hollysProp&#034;); // retrieve the value for my property
</code>
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<p>If you're accessing it from a View you could use:</p>
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<code class="CodeBlock">FlexGlobals.topLevelApplication.persistenceManager.getProperty(&#034;person&#034;); //Retrieves my custom Person class object that was persisted</code>
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<p>To see what's going on behind the scenes, it's helpful to open the debugger and take a look at the <code>persistenceManager</code> variable (see Figure 4). </p>
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<img title="Figure 4. The persistenceManager variable in the debugger." alt="Figure 4. The persistenceManager variable in the debugger." class="cq-dd-image LayoutImage LayoutRow " src="/content/dotcom/en/devnet/flex/articles/flex-mobile-development-tips-tricks-pt1/_jcr_content/articlecontentAdobe/image_2.adimg.mw.650.jpg/1314210314132.jpg"/></div>
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Figure 4. The persistenceManager variable in the debugger.</div>
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<p>You can see that two additional properties are also saved by default: <code>versionNumber</code> and <code>navigatorState,</code> which is used to restore the views to their previous state.</p>
<p>The main disadvantage with using the default PersistenceManager is that the data is not encrypted. However, you are free to define a custom persistence mechanism using the IPersistenceManager interface. So you might, for example, want to implement an encrypted local store for getting and setting sensitive data. Another minor disadvantage, in some cases, is that this mechanism is intended for small amounts of data. If you have a great deal of data to be saved you would want to use SQLite instead. For a great article that walks through creating a mobile application that writes to a SQLite database, see <a href="/devnet/flex/articles/employee-directory-android-flex.html">Building a mobile employee directory sample with Flex and Flash Builder</a> by Christophe Coenraets.</p>
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Where to go from here</h3>
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<p>For more information on persisting data in Flex mobile apps, check out:</p>
<ul>
<li><a target="_blank" href="http://help.adobe.com/en_US/flex/mobileapps/WSb0a29bf92525419c-54dd253312afbec3ecb-8000.html">Adobe LiveDocs - Enabling Persistence</a></li>
<li><a target="_blank" href="http://custardbelly.com/blog/?p=220">Todd Anderson's blog post on the topic</a></li>
<li><a href="http://opensource.adobe.com/wiki/display/flexsdk/View+and+ViewNavigator" target="_blank">The View and ViewNavigator Functional and Design Specification</a></li>
</ul>
<p>In <a href="/devnet/flex/articles/flex-mobile-development-tips-tricks-pt2.html">Part 2</a> of this series I cover styling your Flex 4.5 mobile applications, with a focus on Tabs and the ActionBar control.</p>
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<p><a target="_blank" href="http://creativecommons.org/licenses/by-nc-sa/3.0/"><img src="http://cookbooks.adobe.com/resources/images/license_creative_commons.png" alt="Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License"></a>+<a target="_blank" href="/communities/guidelines/ccplus/commercialcode_plus_permission.html"><img src="http://cookbooks.adobe.com/resources/images/license_adobe.jpg" alt="Adobe Commercial Rights"></a></p>
<p>This work is licensed under a <a target="_blank" href="http://creativecommons.org/licenses/by-nc-sa/3.0/">Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License</a>. Permissions beyond the scope of this license, pertaining to the examples of code included within this work are available at <a target="_blank" href="/communities/guidelines/ccplus/commercialcode_plus_permission.html">Adobe</a>.</p>
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