Hi,
As fast and temporary solution I made a derived class from WeakReference
with extended get_Target behaviour. It uses JNI to check the reference. It
is not a "silver bullet", because this is only a workaround, as an
example, it may be possible that Dalvik already allocated another
object with the same address, so be ready for some kind of InvalidCast
exception in this case. So i desided to follow next two rules:
1. avoid use of WeakReferences with peer objects.
2. write cache for java objects using java.
My temporary solution below:
namespace Android.Workarounds
{
using Android.Runtime;
public class WeakReferenceWorkaround : System.WeakReference
{
public WeakReferenceWorkaround(object target) : base(target)
{
}
public WeakReferenceWorkaround(object target, bool trackResurrection) :
base(target, trackResurrection)
{
}
public override object Target
{
get
{
var target = base.Target;
if (target != null)
{
var javaObject = target as IJavaObject;
if (javaObject != null)
{
var javaLocalRef = JNIEnv.ToLocalJniHandle(javaObject);
if (javaLocalRef == null || javaLocalRef == IntPtr.Zero)
return null;
JNIEnv.DeleteLocalRef(javaLocalRef);
}
}
return target;
}
}
}
}
I just added next lines before cache implementation.
#if __ANDROID__
using WeakReference = Android.Workarounds.WeakReferenceWorkaround;
#endif
Regards
2012/8/29 bjarke [via Mono for Android] <
[email protected]>
> Hi,
>
> Thank you for the response. Lets hope they get it fixed fairly quickly. Do
> you use any alternative way of caching images while waiting?
>
> Regards
>
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