So i guess you should check which Android jar you are using....
Are you using the new SDK Manager integrated in the IDE? Did you adapted the paths in tools-configure paths to use the new SDK?
Make sure to use Android.jar from api 27 which should be default in the new sdk manager.
Yeah - thanks. Right after my post I changed it to 27 & it compiled, but then I ran into another issue (I hate Windows 10) so hadn't had a chance to post that I had resolved it...
Although it begs the question: Where did setKeyboardNavigationCluster come from? I previously was compiling against api 25 without issues & it's only since the B4A 7.80 update that this became an issue. I didn't change anything in my code.