code: public void setOverlayEnabled(boolean enabled) {
      if (enabled != this.enabled) {
        if (Build.VERSION.SDK_INT >= HONEYCOMB) {
          layerize(enabled);
        }
        this.enabled = enabled;
  
        if (!enabled) {
          canvasDelegate.clearCache();
        }
  
        invalidate(); // Trigger a re-draw so we see the grid.
      }
    }
docs: Set whether the pixel grid overlay is enabled.