• Define theme that inherits from older theme (like Holo) in res/ values/styles.xml • Set them as your app’s theme in manifest file New APIs ▪ Layouts - Do not use new XML attributes from Android L in pervious versions. - Provide alternative layouts • Android L Layouts: res/layout-v21 • Alternative: res/layout • Modify the style in res/values-v21 for new APIs
back to v7 - Exposed via support library UI Widgets ▪ CardView - Available back to v7 - Exposed as Support Library - Limitations (pre-L) - Uses programatic shadows - Does not clip children that intersect with rounded corners