DELPHI 10 Seattle 94

I'm using Delphi 10 seattle for developing android mobile application and I have the requirement to get the device email Id. For that I have tried to use the following example for getting EMail address of Mobile. But when I tried to interfaces (JAccountClass, JAccount, JAccountManagerClass) it is asking some other interfaces - JActivity, JAccountManagerCallback and JAccountManagerFuture . Please help me to find these dependency classes. And where can I get these files.

DELPHI 10 seattle 94