Some of the official samples have not been udpated for Android Studio. Compass has, Charades has not.
To deal with the case of an Eclipse project that you want to run in Android Studio:
Open Eclipse and import existing android project and choose the folder for the Compass project (download it from Github page).
Right click the project and select Export
Choose Android and Generate Gradle Build files
If you look in your folder you will see a new build.gradle file
Quit Eclipse to avoid ADB weirdness on some platforms and open Android Studio
File > Import Project > select the build.gradle file from above
Next, it might prompt you to update your Gradle version, do this and let it sync
Then your conifguration might need some help, if you press Play and it pops open a edit configuration dialog, tell it what activity to launch as default, in this case it is: "StartGameActivity".
Finally change the sdk version in build.gradle:
compileSdkVersion "Google Inc.:Glass Development Kit Preview:19"
After you do this, the project will build and run on Glass.
Here is a repo of that result, please fork as you wish:
https://github.com/mscheel/gdk-charades-sample