code: public void setPadding(int leftPadding, int topPadding, int rightPadding, int bottomPadding) {
          mPaddingLeft = leftPadding;
          mPaddingRight = rightPadding;
          mPaddingTop = topPadding;
          mPaddingBottom = bottomPadding;
      }
docs: set paddings for this layoutHelper
  @param leftPadding left padding
  @param topPadding top padding
  @param rightPadding right padding
  @param bottomPadding bottom padding