Adobe Flex: memory leak when pushView an popView - apache-flex

Question

I am having problems of memory leaks with an app I had build in Adobe Flex, using Flex Builder. After using it for 30-40 minutes it starts to go slower and slower.
The app shows images as a catalog, but when I push and pop the views my memory rise considerably.
My thoughts are that if I set all my objects to null and dispose all the bitmapdata that I use I could free enough memory to keep using the app with no problems, but it seems like the problem is not there.
I have 3 views in my app menuView.mxml,categoriesView.mxml and productsView.mxml.
My App starts up in my pc (not in tablet) with TotalMemory: 47Mb and Private Memory : 88 MB
After pushing and poping the views for 5 times I get TotalMemory: 61Mb and Private Memory : 101 MB
Imagine if I do this several times. The app begins to go very slow in my Ipad or my Samsung Galaxy Tab.
Why is this happening? I have no idea how to solve this.
Please help! Thanks a lot!!
I put some code below.
When I am in menuView I use the following code to push the view from menuView to categoriesView
protected function button3_clickHandler(event:MouseEvent):void
{
if((FlexGlobals.topLevelApplication.getIdClienteServidorCompraActual( )!=null)&& (FlexGlobals.topLevelApplication.getIdClienteServidorCompraA ctual()>0))
{
navigator.pushView(categoriesView);
}
}
When I am in categoriesView I use the following code to push the view from categoriesView to productsView. In this view I have 3 buttons for each category.
protected function buttonC1_clickHandler(event:MouseEvent):void
{
//Categoria general con todos
var ab:ArrayCollection = getIdAmbienteServidor();
cleanMemory();
navigator.pushView(productsView, null);
}
private function cleanMemory():void
{
result.splice(0);
result = null;
System.gc();
}
When I am in productsView I use the following code to pop(I USE PUSH INSTEAD OF POP DUE TO DIFFERENT OPTIONS I HAVE) the view from productsView to categoriesView .
protected function button1_clickHandler(event:MouseEvent):void
{
cleanMemory();
navigator.pushView(menuView);
}
private function cleanMemory():void
{
if(image1 != null)
{
image1.source = "";
if(image1.bitmapData != null)
{
image1.bitmapData.dispose();
}
}
if(image2 != null)
{
image2.source = "";
if(image2.bitmapData != null)
{
image2.bitmapData.dispose();
}
}
if(result != null)
{
result.splice(0);
result = null;
}
if(result1 != null)
{
result1.splice(0);
result1 = null;
}
if(result2 != null)
{
result2.splice(0);
result2 = null;
}
dbConnection = null;
object1 = null;
object2 = null;
dataToSave = null;
cGreyImageSmallAsset = null;
cRedImageSmallAsset.bitmapData.dispose();
cRedImageSmallAsset = null;
cOrangeImageAsset.bitmapData.dispose();
cOrangeImageAsset = null;
cGreenImageAsset.bitmapData.dispose();
cGreenImageAsset = null;
cPinkImageAsset.bitmapData.dispose();
cPinkImageAsset = null;
cBlueImageAsset.bitmapData.dispose();
cBlueImageAsset = null;
cGreyImageAsset.bitmapData.dispose();
cGreyImageAsset = null;
cRedImageAsset.bitmapData.dispose();
cRedImageAsset = null;
cGreenImageSmall = null;
cOrangeImageSmall = null;
cPinkImageSmall = null;
cBlueImageSmall = null;
cGreyImageSmall = null;
cRedImageSmall= null;
cGreenImage = null;
cPinkImage = null;
cBlueImage= null;
cGreyImage = null;
cRedImage= null;
cOrangeImage= null;
System.gc();
}
I load the images with.
private function setImages():void
{
if(object1!=null)
{
panelLeft.visible = true;
buttonLeftMore.visible = true;
image1.source = "file://" + File.applicationStorageDirectory.nativePath + "/b"+object1.idArchivo+"_500.jpg";
setObject1MainTexts();
}
else
{
image1.source = "";
panelLeft.visible = false;
buttonLeftMore.visible = false;
}
if(object2!=null)
{
panelRight.visible = true;
buttonRightMore.visible = true;
image2.source = "file://" + File.applicationStorageDirectory.nativePath + "/b"+object2.idArchivo+"_500.jpg";
setObject2MainTexts();
}
else
{
image2.source = "";
panelRight.visible = false;
buttonRightMore.visible = false;
}
}
When I am in categoriesView i use the following code to pop(I USE PUSH INSTEAD OF POP DUE TO DIFFERENT OPTIONS I HAVE) the view from categoriesView to menuView.
protected function button1_clickHandler(event:MouseEvent):void
{
cleanMemory();
navigator.pushView(menuPrincipalBelda);
}
private function cleanMemory():void
{
result.splice(0);
result = null;
System.gc();
}
Thanks in advance!

Answer 1

I discover the problem: I was not removing the EventListener, now is working fine.
I leave you guys with some examples. If you do not remove them, then memory increases a lot! Be careful with this.
stage.addEventListener("keyUp", handleButtons, false, 1);
stage.removeEventListener("keyUp",handleButtons,false);
xeasy.addEventListener(ResultEvent.RESULT, AppWS_resultHandler);
xeasy.removeEventListener(ResultEvent.RESULT,AppWS_resultHandler, false);
Thanks to everybody!!

Answer 2

Remember that Flex Builder uses the Flash virtual machine and this frees the memory when considered necessary, even if you try to force him to clean the garbage collector will not do if you have free memory and does not consider it necessary.
Test the movie embedded in the images you need in the application, and not constantly loading. Since this may be letting some low-level relationship.
regards

Answer 3

When I worked with GC I found that it became of advantage to try several different ways! I used 3 in total over time, but just can only find one at the moment as this was the one noticeable better working in this App. so here it is and if needed I can send the other two as well must just look for them!
private var gcCount:int;
private function startGCCycle():void {
gcCount = 0;
addEventListener(Event.ENTER_FRAME, doGC);
}
private function doGC(evt:Event):void {
flash.system.System.gc();
if(++gcCount > 1) {
removeEventListener(Event.ENTER_FRAME, doGC);
setTimeout(lastGC, 40);
}
}
private function lastGC():void{
flash.system.System.gc();
}
]]>
I just was looking at something else which you should try as well it worked for me very well!
FlexGlobals.topLevelApplication.deleteReferenceOnParentDocument(this) I used these in a creationComplete in MXML where I had to open 45 Main Canvases one after another but each time with three PopUps = 180 which was easy to handle in the way I worked the GC in! regards aktell