Hi Guys,
I am working with out of memory problem and it is bashing my head :)
In my project each activity has a instance of a imagehandler, this class
loads images from memory. It caches the latest 5 bitmaps and should dispose
the others and this ssems to work as the memory uses stabelizes. The
following three methods are in the imagehandler
public Bitmap DecodeFile(string _path)
{
if (ImageCacheImages.ContainsKey(_path))
{
return ImageCacheImages[_path];
}
Bitmap newImage = null;
try
{
newImage = BitmapFactory.DecodeFile(_path, _options);
}
catch (Exception)
{
if (this.RecycleImages())
{
return this.DecodeFile(_path);
}
else
{
return null;
}
}
ImageCacheImages.Add(_path, newImage);
_keys.Add(_path);
if (ImageCacheImages.Count > 5)
{
this.ReleaseImage(0);
}
return newImage;
}
/// <summary>
/// Method recycles each bitmap for better gc
/// </summary>
public bool RecycleImages()
{
if (ImageCacheImages.Count>0)
{
for (int i = 0; i < ImageCacheImages.Count; i++)
{
KeyValuePair<string, Bitmap> item =
ImageCacheImages.ElementAt(i);
Bitmap img = item.Value;
img.Dispose();
img = null;
}
ImageCacheImages.Clear();
GC.Collect();
return true;
}
GC.Collect();
return false;
}
public bool ReleaseImage(int itemIndex)
{
if (_keys.Count > itemIndex)
{
string key = _keys[itemIndex];
Bitmap img = ImageCacheImages[key];
ImageCacheImages.Remove(key);
_keys.RemoveAt(itemIndex);
img.Dispose();
img = null;
GC.Collect();
return true;
}
GC.Collect();
return false;
}
When finishing a activity I call the method public bool RecycleImages() on
the imagehandler to release memory. This is in the ondestroy method of the
activity:
ImageHandler.RecycleImages();
ImageHandler.Dispose();
base.OnDestroy();
However it still seems to be leaking. The bitmaps are used in a custom
imageview where the bitmap is set the following way:
var image = _activityContext.ImageHandler.DecodeFile(_path);
if (image!=null)
{
SetImageBitmap(image);
this.Invalidate();
}
Do you guys have any suggestion if the handling of bitmaps is correct or
what can I improve?
Regards
Bjarke
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