code: public void setSize(int size) {
          if (size != MaterialProgressDrawable.LARGE && size != MaterialProgressDrawable.DEFAULT) {
              return;
          }
          final DisplayMetrics metrics = getResources().getDisplayMetrics();
          if (size == MaterialProgressDrawable.LARGE) {
              mCircleHeight = mCircleWidth = (int) (CIRCLE_DIAMETER_LARGE * metrics.density);
          } else {
              mCircleHeight = mCircleWidth = (int) (CIRCLE_DIAMETER * metrics.density);
          }
          // force the bounds of the progress circle inside the circle view to
          // update by setting it to null before updating its size and then
          // re-setting it
          mCircleView.setImageDrawable(null);
          mProgress.updateSizes(size);
          mCircleView.setImageDrawable(mProgress);
      }
docs: One of DEFAULT, or LARGE.