As Google says in this page, Material Theme is only available on Android L Developer Preview. But how can these apps work on previous version of Android L?
https://play.google.com/store/apps/details?id=com.borggren.notes
http://officialandroid.blogspot.it/2014/10/a-new-look-for-google-play-newsstand.html
There are other apps.
Do they use some components similar to material design?
Don't they use the "android:Theme.Material"?
Or is there a way to use Material Theme on previous versions (and I am the only one who doesn't know how to do this)?