DrawBorder.java 文件源码

@Override
protected @Nullable DashPathEffect getPathEffectForBorderStyle() {
  if (isFlagSet(BORDER_PATH_EFFECT_DIRTY)) {
    switch (mBorderStyle) {
      case BORDER_STYLE_DOTTED:
        mPathEffectForBorderStyle = createDashPathEffect(getBorderWidth());
        break;

      case BORDER_STYLE_DASHED:
        mPathEffectForBorderStyle = createDashPathEffect(getBorderWidth() * 3);
        break;

      default:
        mPathEffectForBorderStyle = null;
        break;
    }

    resetFlag(BORDER_PATH_EFFECT_DIRTY);
  }

  return mPathEffectForBorderStyle;
}