code: private void drawThumbShadow(float screenCoord, Canvas canvas) {
          thumbShadowMatrix.setTranslate(screenCoord + thumbShadowXOffset, textOffset + thumbHalfHeight + thumbShadowYOffset);
          translatedThumbShadowPath.set(thumbShadowPath);
          translatedThumbShadowPath.transform(thumbShadowMatrix);
          canvas.drawPath(translatedThumbShadowPath, shadowPaint);
      }
docs: Draws a drop shadow beneath the slider thumb.
  
  @param screenCoord the x-coordinate of the slider thumb
  @param canvas      the canvas on which to draw the shadow