code: public static DaVinci init(Context context, int size) {
          if (INSTANCE == null)
              INSTANCE = new DaVinci(context, size);
          if (context != null)
              INSTANCE.mContext = context;
          return INSTANCE;
      }
docs: Initialise DaVinci, muse have a googleApiClient to retrieve Bitmaps from Smartphone
  
  @param context the application context
  @param size    the number of entry on the cache