Namespace Java.Lang.Ref Classes Cleaner https://developer.android.com/reference/java/lang/ref/Cleaner.html Cleaner.Cleanable https://developer.android.com/reference/java/lang/ref/Cleaner.Cleanable.html PhantomReference https://developer.android.com/reference/java/lang/ref/PhantomReference.html PhantomReference<T> https://developer.android.com/reference/java/lang/ref/PhantomReference.html Reference https://developer.android.com/reference/java/lang/ref/Reference.html ReferenceQueue https://developer.android.com/reference/java/lang/ref/ReferenceQueue.html ReferenceQueue<T> https://developer.android.com/reference/java/lang/ref/ReferenceQueue.html Reference<T> https://developer.android.com/reference/java/lang/ref/Reference.html SoftReference https://developer.android.com/reference/java/lang/ref/SoftReference.html SoftReference<T> https://developer.android.com/reference/java/lang/ref/SoftReference.html WeakReference https://developer.android.com/reference/java/lang/ref/WeakReference.html WeakReference<T> https://developer.android.com/reference/java/lang/ref/WeakReference.html