Note: The following issues were found on lines that were not modified in the pull request. Because these issues can't be reported as line comments, they are summarized here:
ButtonView.java#L153: Define a constant instead of duplicating this literal "Button " 3 times.
ButtonView.java#L230: Either re-interrupt this method or rethrow the "InterruptedException".
Demonstrates button shortcuts using the new Shortcut API available in V13.
This change is