code: public void getBounds(Rect bounds) {
          final int r = (int) Math.ceil(mTargetRadius);
          bounds.set(-r, -r, r, r);
      }
docs: Populates {@code bounds} with the maximum drawing bounds of the ripple relative to its
  center. The resulting bounds should be translated into parent drawable coordinates before
  use.
  
  @param bounds the rect to populate with drawing bounds