title: Callback for when WeakReference is removed
body: <p>Is there a way to be alerted when a WeakReference is removed? I need to add an Android Context to an Instance, I am adding this as a WeakReference and then I would like to handle a few things when/if this is removed? I think that I read about this somewhere, but of cause I can't remember where and searching for it gives me nothing :(</p>