我这儿的build.gradle配置是这样的:
报错为:
stackoverflow的解答:java - Android studio: cannot access MenuHost class file for androidx.core.view.MenuHost not found - Stack Overflowhttps://stackoverflow.com/questions/70125444/android-studio-cannot-access-menuhost-class-file-for-androidx-core-view-menuhos
将MainActivity中的extends AppCompatActivity改为extends Activity就行了