Activity继承AppCompatActivity()方法时

Cannot access 'androidx.lifecycle.HasDefaultViewModelProviderFactory' which is a supertype of 'com.djt.module_kouyu.TestActivity'. Check your module classpath for missing or conflicting dependencies

解决办法：
在build.gradle里添加依赖

 implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'

https://www.jianshu.com/p/ee7523394ff8