安卓离线打包如何设置applink?

app有个需求，就是点击链接自动打开app，离线打包在工程怎么配置？
按照网上教程
https://juejin.cn/post/6899768301846462471#heading-5
走到第二部（如下面所示）就不行了。AS提示

Can't insert code, because there is no onCreate method defined in your activity class.

通过App Links Assistant -> Select Activity选择之前配置的URL对应的Activity, 点击Insert Code即可在onCreate方法中插入获取从App Links跳转而来的URL的代码，生成代码如下  
ini复制代码// ATTENTION: This was auto-generated to handle app links.  
Intent appLinkIntent = getIntent();  
String appLinkAction = appLinkIntent.getAction();  
Uri appLinkData = appLinkIntent.getData();

请问一下，离线打包，这个applinks要怎么配置呢