Last month, we released the Android 11 Developer Preview, which allows you to test out the new Android 11 SDK. We upgraded a number of annotations in the SDK from @RecentlyNullable and @RecentlyNonNull to @Nullable and @NonNull (warnings to errors) and continued to annotate the SDK with more @RecentlyNullable and @RecentlyNonNull annotations on methods that didn’t have nullability information before.