The (so far) insufficient documentation for Material Design / components says this
To try out the MDC Catalog app, you can either run the catalog module
in Android Studio or run the following Gradle command:
However, I can ont find the “catalog module” in Android Studio, nor am I sure where to run that Gradle command.
Finally, there is no catalog app in GitHub for Android although there is a “catalog app” for the web components.
The catalog app is located here: https://github.com/material-components/material-components-android/tree/master/catalog.