android material 素材,Supporting Android material design

I'm going to rehash the material here incase the link gets taken down, which most likely it will be in the near future.

For the Material theme

The material theme is only available in the Android L Developer

Preview. To configure your app to use the material theme on devices

running the Android L Developer Preview and an older theme on devices

running earlier versions of Android:

Define a theme that inherits from an older theme (like Holo) in

res/values/styles.xml. Define a theme with the same name that inherits

from the material theme in res/values-v21/styles.xml. Set this theme

as your app's theme in the manifest file.

As for layouts

If the layouts that you design according to the material design

guidelines do not use any of the new XML attributes from the Android L

Developer Preview, they will work on previous versions of Android.

Otherwise, you can provide alternative layouts. You can also provide

alternative layouts to customize how your app looks on earlier

versions of Android.

Create your layout files for the Android L Developer Preview inside

res/layout-v21/ and your alternative layout files for earlier versions

of Android inside res/layout/. Alternative layouts have the same file

name.

To avoid duplication of code, define your styles inside res/values/

and modify the styles in res/values-v21/ for the new APIs.

For UI Widgets

The RecyclerView and CardView widgets are included in the Android L

Developer Preview Support Library, so they are available in earlier

versions of Android with these limitations:

CardView falls back to a programmatic shadow implementation using

additional padding. CardView does not clip its children views that

intersect with rounded corners. These limitations do not apply to the

Android L Developer Preview.

and lastly for Animations

The following new APIs are only available in the Android L Developer

Preview:

Activity transitions, Touch feedback, Reveal animations, Path-based

animations. To preserve compatibility with earlier verisons of Android,

check the system version at runtime before you invoke these APIs.