Changes

Within the Project tool window, navigate to the app -> src -> main -> res -> layout -> activity_build_example.xml file and double click on it to load it into the Designer tool. With the tool in Design mode, double click on the background of the screen layout and specify layout as the id of the relative layout view.

In the Project tool window, right-click on the activity_build_example.xml file and select the Copy menu option. With the file copied, right-click on the src -> phone -> res -> layout folder and select the Paste menu option to add a copy of the file to the folder. Within the Copy dialog click on OK to accept the defaults.