code: public static int getByteCount(int width, int height, Config config) {
          int bytes = 0;
          switch (config) {
              case ALPHA_8:
                  bytes = 1;
                  break;
              case RGB_565:
                  bytes = 2;
                  break;
              case ARGB_4444:
                  bytes = 2;
                  break;
              case ARGB_8888:
                  bytes = 4;
                  break;
          }
          return width * height * bytes;
      }
docs: Get the number of bytes that would be used to store a bitmap with the size, in pixels, and
  storage config.