Android Basics issue:

[nicholeb]

https://developer.android.com/codelabs/basic-android-kotlin-training-display-list-cards?

"Use cards"

I made the changes to add the Material Card View and the app would crash with a logcat error that "The style on this component requires your app theme to be Theme.MaterialComponents" Was on a Nexus 6 emulator. I was able to resolve it by changing the theme.

Steps to reproduce?
Just follow the instructions for adding the card view and run the app.

Versions
What version of Android Studio are you using?
4.0.1

Additional information
Perhaps I missed an instruction for changing the theme earlier in the codelab, but I went back through it and didn't see anything.

[android-dev-lxl]

@nicholeb

Thank you so much for reporting this issue, yes you need to change the parent app theme, if you are in AS 4.0.
We added a the following note to the code lab and will be published shortly.

Note: If you’re using Android Studio 4.0, make this change to your res > values > styles.xml file. Change the parent app theme from Theme.AppCompat.Light.DarkActionBar to Theme.MaterialComponents.DayNight.DarkActionBar.