android x google signin issue

最近升級到android x,
一堆問題,首先你必須先run migrate to anroidx
 
 
然後沒事還好,當然有發生當機問題: 
 
java.lang.IncompatibleClassChangeError: 
Class 'com.google.android.gms.auth.api.signin.internal.SignInHubActivity' 
does not implement interface 'androidx.lifecycle.LifecycleOwner' 
in call to 'androidx.lifecycle.Lifecycle androidx.lifecycle.LifecycleOwner.getLifecycle()' 
(declaration of 'androidx.lifecycle.LiveData' 
appears in /data/app/.../base.apk!classes2.dex)
 
找了老半天才找到解法: 
solution:
add two line to app\build.gradle into dependencies {}
 
implementation 'androidx.core:core:1.+' 
implementation 'androidx.appcompat:appcompat:1.+'