code: public void drawLeft(View view, Canvas c) {
          int left = view.getLeft() - mWidth;
          int top = view.getTop() - mHeight;
          int right = left + mWidth;
          int bottom = view.getBottom() + mHeight;
          mDivider.setBounds(left, top, right, bottom);
          mDivider.draw(c);
      }
docs: Draw the divider on the left side of the Item.