cannot access IUnityPlayerLifecycleEvents class file for com.unity3d.player.IUnityPlayerLifecycleEve

I am Using Unity 2019.3.0b4 as Android Library
https://forum.unity.com/threads/integration-unity-as-a-library-in-native-android-app.685240/
Demo scene works fine, but if I try to iherit from OverrideUnityActivity I get an Error.
1) Class generated by Unity

2) Second class generated by Unity
3) Try to extend class in second step
4) Got error error: cannot access IUnityPlayerLifecycleEvents
class file for com.unity3d.player.IUnityPlayerLifecycleEvents not found

 

Same here for Unity2019.3.0b6 user! For me, even the demo scene doesn't work.!

 

not working on unity 2019.3.7 as well

 

@justinduy Did you got solution. i am also facing same problem

 

make sure to include in the build.gradle(Module :app)

implementation fileTree(dir: project(':unityLibrary').getProjectDir().toString() + ('\\libs'), include: ['*.jar']

for me on Ubuntu

implementation fileTree(dir: project(':unityLibrary').getProjectDir().toString() + ('/libs'), include: ['*.jar']

and change "\\" to "/" in

project(':unityLibrary').projectDir=[URL='http://www.google.com/search?q=new+msdn.microsoft.com']new[/URL] File('..\\UnityProject\\androidBuild\\unityLibrary')

this worked.