Material design for Android

  Material design is a comprehensive guide for visual, motion, and interaction design across platforms and devices. Android now includes support for material design apps. To use material design in your Android apps, follow the guidelines defined in the material design specification and use the new components and functionality available in Android 5.0 (API level 21) and above.

Android provides the following elements for you to build material design apps:

• A new theme
• New widgets for complex views
• New APIs for custom shadows and animations

For more information about implementing material design on Android, see Creating Apps with Material Design.

Material Theme

The material theme provides a new style for your app, system widgets that let you set their color palette, and default animations for touch feedback and activity transitions.

         Dark material theme                                                                            Light material theme  

Lists and Cards

Android provides two new widgets for displaying cards and lists with material design styles and animations:

The new RecyclerView widget is a more pluggable version of ListViewthat supports different layout types and provides performance improvements.

The new CardView widget lets you display important pieces of information inside cards that have a consistent look and feel.
For more information, see Creating Lists and Cards.

View Shadows
In addition to the X and Y properties, views in Android now have a Z property. This new property represents the elevation of a view, which determines:

• The size of the shadow: views with higher Z values cast bigger shadows.
• The drawing order: views with higher Z values appear on top of other views.

For more information, see Defining Shadows and Clipping Views.

Animations

The new animation APIs let you create custom animations for touch feedback in UI controls, changes in view state, and activity transitions.

These APIs let you:

• Respond to touch events in your views with touch feedbackanimations.
• Hide and show views with circular reveal animations.
• Switch between activities with custom activity transitionanimations.
• Create more natural animations with curved motion.
• Animate changes in one or more view properties with view state change animations.
• Show animations in state list drawables between view state changes.

Touch feedback animations are built into several standard views, such as buttons. The new APIs let you customize these animations and add them to your custom views.

For more information, see Defining Custom Animations.

Drawables

These new capabilities for drawables help you implement material design apps:

• Vector drawables are scalable without losing definition and are perfect for single-color in-app icons.
• Drawable tinting lets you define bitmaps as an alpha mask and tint them with a color at runtime.
• Color extraction lets you automatically extract prominent colors from a bitmap image

For more information, see Working with Drawables.

References:

https://developer.android.com/design/get-started/principles.html
http://www.google.com/design/spec/material-design/introduction.html
https://developer.android.com/design/material/index.html 
https://www.youtube.com/watch?v=p4gmvHyuZzw
https://www.youtube.com/watch?v=XOcCOBe8PTc
https://www.youtube.com/watch?v=YaG_ljfzeUw