Hi Jon, thank you for your time:)
I used the following class as a Imagehandler because I wanted to minimize
the use of memory in the app and have a cache of images ready.
In this scenario multiple activities share the same bitmap instance wrapped
in a weakreference. But sometimes a images goes missing - the reference is
still there but when the image is loaded in the imageview nothing is shown -
which is kind of weird. I am suspecting the weakreferences to be the issue.
Therefore I am not sure if this is the best approach to load images and keep
asking questions :)
public static class ImageHandler
{
public static Dictionary<string, WeakReference> ImageCache = new
Dictionary<string, WeakReference>();
public static Bitmap DecodeFile(string _path)
{
WeakReference reference;
var options = new BitmapFactory.Options {InPreferredConfig =
Bitmap.Config.Rgb565};
Bitmap image=null;
if (ImageCache.TryGetValue(_path, out reference))
{
try
{
if (reference.IsAlive)
{
if (reference.Target is Bitmap)
{
image = (Bitmap)reference.Target;
}
if ((reference.Target as Bitmap) == null)
{
// image has been garbage collected
// remove reference from cache
ImageCache.Remove(_path);
}
else
{
return image;
}
}
else
{
// image has been garbage collected
// remove reference from cache
ImageCache.Remove(_path);
}
}
catch (Exception)
{
// image has been garbage collected
// remove reference from cache
ImageCache.Remove(_path);
}
}
image = BitmapFactory.DecodeFile(_path, options);
reference = new WeakReference(image);
ImageCache.Add(_path, reference);
return image;
}
}
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