Hi,
As written, your getView() method *never* reuses the convertView
parameter. This means you are creating new Views and new Bitmaps every
time the method is called, which happen very often while
scrolling/flinging a grid.
You first need to start using the convertView when possible (if
convertView != null, cast it to an ImageView and set your drawable on
it.) Note that setting the scale type, layout params and background
resource should be done only when convertView == null. This will save
you a lot of time.
Finally, you should create a cache for your bitmaps to avoid reloading
them all the time.
I encourage you to read the source code of the following application
to see how to implement an efficient list of images:
http://code.google.com/p/shelves/
Also refer to my Google I/O 2009 talk about UI optimization:
http://code.google.com/events/io/2009/sessions/TurboChargeUiAndroidFast.html
In this talk I describe how to implement getView() efficiently and
talk about image caches briefly at the end.
On Mon, Apr 26, 2010 at 12:50 AM, Lars axberg.l...@gmail.com wrote:
Hi
I have a gallery in wich I show a row of images, the images can both
be from the Camera gallery or from the internet as a web url. My
getView() method makes an exception when I put to many images from the
gallery inside it. Should i down sample the images before attaching
them to the view? and how is that done ? heres my getView method:
public View getView(int position, View convertView, ViewGroup parent)
{
Controller co = Controller.GetInstance();
ImageView imageView = new ImageView(context);
if(co.server.currRecord.image.get(position).containsKey(data))
{
// we have a content URI and assign it to the gallery
imageView.setImageURI((Uri)co.server.currRecord.image.get(position).get(data));
}
else
{
//we have a web url and need our ImageOperation method to
fetch and decode the drawable.
imageView.setImageDrawable(FileConvert.ImageOperations(context,
Controller.GetInstance().server.currRecord.image.get(position).get(url).toString()));
}
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setLayoutParams(new Gallery.LayoutParams(150, 120));
imageView.setBackgroundResource(itemBackground);
return imageView;
}
- Lars
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