code: public void setMargin(int leftMargin, int topMargin, int rightMargin, int bottomMargin) {
          this.mMarginLeft = leftMargin;
          this.mMarginTop = topMargin;
          this.mMarginRight = rightMargin;
          this.mMarginBottom = bottomMargin;
      }
docs: Set margins for this layoutHelper
  
  @param leftMargin left margin
  @param topMargin top margin
  @param rightMargin right margin
  @param bottomMargin bottom margin