This example code was taken straight from github. I am confident that this code is supposed to build but I suspect something in the compiler of Android Studio has changed, updated, or with a newer version of the Android operating system something needs to be updated in the source code of an app. This is because a build and/or gradle sync has this error immediately. Nothing major has changed in the code. I suspect this might be a common thing and I suspect someone must know something about this and how to fix it. Please advise.