[android-developers] Re: Lazy loading in HorizontalScrollView to prevent Out of Memory issue

Are you loading a large number of images into your
HorizontalScrollView?

If so, then you are probably running out of memory from the Bitmap
creation process. You need to subsample them so you aren't loading
billboard sized images into your app, like this.

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
options.inTempStorage = new byte[16*1024];

Bitmap img =
BitmapFactory.decodeStream(getContentResolver().openInputStream(imagePath),null,options);

On Aug 26, 1:00 am, himanshu jain <himanshu....@gmail.com> wrote:
> I want to add lazy loading feature to HorizontalScrollView, It has
> linearlayout as a child and i am addding to linearlayout,
>
> I am interested in listening to the event when the child view is out
> of the visibility area,  I see in linearlayout implementation it does
> not call either dispatchViewVisibility or onDraw on child view , why i
> want that because bitmap attached to the child view can be recycled
> and create bitmap again when child view is visible (well that is a
> separate part ,How can i create that bitmap very fast, I am planning
> to use opengl for that) but the question is how can make such custom
> view.
>
> I can not use gallery view because it does not solve my purpose
>
> I saw that viewgroup has feature of dispatchingViewVisibility and
> dispatchOnDraw but not sure how to use that with
> HorizontalScrollView.?
>
> All i am doing to prevent Out of Memory issue
>
> Any suggestion and help would be appreciated
>
> thanks

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