code: @Nullable @MainThread static ActivityScopedCache getActivityScope(@NonNull Activity activity) {
      if (activity == null) {
        throw new NullPointerException("Activity is null");
      }
      String activityId = activityIdMap.get(activity);
      if (activityId == null) {
        return null;
      }
  
      return activityScopedCacheMap.get(activityId);
    }
docs: Get the  {@link ActivityScopedCache} for the given Activity or <code>null</code> if no {@link
  ActivityScopedCache} exists for the given Activity
  
  @param activity The activity
  @return The {@link ActivityScopedCache} or null
  @see #getOrCreateActivityScopedCache(Activity)