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From Alex Harui <aha...@adobe.com>
Subject RE: list of images: poor performances
Date Mon, 30 Jun 2014 14:49:40 GMT
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?

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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