On May 11, 2012, at 6:22 AM, michelw wrote:
> I've a problem (too malloc) when i read pics from sdcard in my gridview.
The problem is circular (cross-VM) object references:
http://docs.xamarin.com/android/advanced_topics/garbage_collection
In particular:
> //i print the good pic
>
> imageView.SetImageDrawable(Drawable.CreateFromPath(Config.CheminCache +
> nameofpic));
The Drawable.CreateFromPath() call here will create a Peer instance (C#
Android.Graphics.Drawables.Drawable instance + Java
android.graphics.drawable.Drawable instance), which form a circular reference:
the C# managed peer won't be collectable until the Java framework peer is
collectible, and vice versa. The result is that the Java-side Drawable instance
will have an extended lifetime; it is still collectible, but ONLY if it ceases
to be referenced from Java code AND the C# object is no longer referenced from
C# code.
Normally this would be fine. However, with large Java-side objects (such as
Bitmaps) having ANY extended lifetime semantics is very probably Bad™, as
Mono's GC won't be running frequently enough to allow the Java instance to be
collected.
The fix is to nuke the Managed peer:
using (var d = Drawable.CreateFromPath(Config.CheminCache + nameofpic))
imageView.SetImageDrawable(d);
This will allow the Java-side Drawable object to be collected as soon as Dalvik
is able to, instead of whenever both Dalvik & Mono agree that an object can be
collected.
- Jon
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