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From Gabriele Campi <gabriele.ca...@medialogic.eu>
Subject Re: list of images: poor performances
Date Mon, 30 Jun 2014 15:09:51 GMT
150 images
Size 10 to 100 KB
400x400 pixel

On iPad retina is almost ok. On iPad2/Mini is slow. On Android (galaxy 
tab 2) the list is unusable.
Every new row of the list seems to freeze the ui while images are loading.
I don't understand, Isn't the load process of the images asynchronous?


Il 30/06/14 16:49, Alex Harui ha scritto:
> How many images are we talking about?  What pixel dimensions are the images in the list?
 What are some of the sizes in bytes of the images being downloaded?
> -Alex
> ________________________________________
> From: Gabriele Campi [gabriele.campi@medialogic.eu]
> Sent: Monday, June 30, 2014 6:30 AM
> To: Javier Guerrero García; users
> Subject: Re: list of images: poor performances
> Nothing seems to work... performances are even worse with a timer or delay
> I cannot cache all the images because of memory consumption
> Il 28/06/14 10:44, Javier Guerrero García ha scritto:
>> Also adjust the opaqueBackground, don't set the image sources
>> inmediately but after a short timeout (so if you scroll down fast
>> skipping lets say 50 images you DON'T load 50 images before loading
>> the 51st), and use a contentCache loader with queueing
>> (http://corlan.org/2011/08/16/flex-mobile-development-caching-images-using-contentcache/)
>> P.S. you can use the ContentCache straight from MXML, not like the
>> sources in the link. Just declare it, set an ID and the rest of the
>> parameters, and set contentCache="{id}" in your itemRenderer.
>> On Sat, Jun 28, 2014 at 6:58 AM, Alex Harui <aharui@adobe.com
>> <mailto:aharui@adobe.com>> wrote:
>>      Make sure you are using a bitmap cache and that the images are not
>>      being scaled down on the device.
>>      Sent via the PANTECH Discover, an AT&T 4G LTE smartphone.
>>      Gabriele Campi <gabriele.campi@medialogic.eu
>>      <mailto:gabriele.campi@medialogic.eu>> wrote:
>>      Hi,
>>      in a mobile app I need to display a list of 200 images. On the list I
>>      use a tileLayout with virtualLayout=true and a custom itemRenderer
>>      that
>>      only contains a Spark Image. On the set value method of the
>>      itemrenderer
>>      I change the source of the image with the path to the new bitmap.
>>      It works, but performances are poor and the list doesn't scroll
>>      well. On
>>      iPad it's almost acceptable, but on Android I have to scroll row
>>      by row
>>      and wait until every image of the row is loaded.
>>      Any suggestions to improve the situation?
>>      Thanks
>>      Gabriele

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