WXViewUtils.java 文件源码

public static @Nullable
BorderDrawable getBorderDrawable(@NonNull View view){
  Drawable drawable=view.getBackground();
  if(drawable instanceof BorderDrawable){
    return (BorderDrawable) drawable;
  }
  else if(drawable instanceof LayerDrawable){
    if(((LayerDrawable) drawable).getNumberOfLayers()>1) {
      Drawable innerDrawable=((LayerDrawable) drawable).getDrawable(0);
      if(innerDrawable instanceof BorderDrawable){
        return (BorderDrawable) innerDrawable;
      }
    }
  }
  return null;
}