怎样消除AlertDialog标题栏最上面的蓝色线

Question

如题，试着网上的办法添加代码，但是报错不知道怎么解决
Context context = dialog.getContext();

int divierId = context.getResources().getIdentifier("android:id/titleDivider", null, null);

View divider = dialog.findViewById(divierId);

divider.setBackgroundColor(0xffffffff);
报错为：The method findViewById(int) is undefined for the type AlertDialog.Builder
各位大神指点一下

Answer 1

View divider = dialog.findViewById(divierId); findViewById应该是Context类中的方法吧，不能用于AlertDialog.Builder