Gridview getChildAt hidden fields

I have issue with Gridview in Android.

Context : I have a gridview, with a list of images downloaded (around 100 开发者_StackOverflowimages).

To do it more convenient for user, a first gridview is load, with inside 100 images on which is a logo Loading. After that, I start an AsyncTask that : In onProgressUpdate => Update image with gridview.getChildAt In onPostExecute => change adapter of gridview with the list of bitmaps downloaded

My issue is in onProgressUpdate. When using getChildAt(position), I realized that position means position of the item in the visible rect. So there is two issues : => First, hidden images are not updated (it's why I'm doing an setAdapter in PostExecute) => Second, if I scroll while downloading, it forget the first images, and some other issues while scrolling, but difficult to express with word ...

My question is a little easy, but I didn't find in Android Reference, and also after Google searches : - How is it possible to update a view in a gridview by its real position, and not by visible position ?

Thanks a lot

Views that are not visible do not exist, so you can't update them. You can only update your backing model to have the correct information once the user scrolls to a particular item. So what you need to do is to retrieve the images and save them in a cache (or the model itself) that you can access when rendering a particular view.

However, I would suggest that there's no need to retrieve any images the user is not seeing yet.