您应该在命令行上运行sudo git --version。
它会要求您同意git xcode许可协议，一旦完成所有操作都将像以前一样工作。

I get this error in Android Studio:

Can't start Git: /usr/bin/git Probably the path to Git executable is not valid.

It gives me an option to fix it, where it takes me to the area in Android Studio to set the path to git. I see it is set to

/usr/bin/git

And I check that path, and that path is indeed the path to the git executable. Why is Android Studio unable to start git?

EDIT: When I try to use git commands in the Android Studio terminal it says:

Agreeing to the Xcode/iOS license requires admin privileges, please re-run as root via sudo.

You should run "sudo git --version" on your command line. It will ask you to agree to the git xcode license agreement, once done everything will work as before.