Here is complex answer for you
Material Design from Android 2.2 (API 8) to present 5.0 (API 21)
Here what you need:
- Toolbar
- Material Design Library for widgets (buttons, checkboxes, etc)
1. Toolbar
Just get the idea and you ready to go.
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimaryDark"/>
Setup guide: http://antonioleiva.com/material-design-everywhere/
Source with example: https://github.com/antoniolg/MaterialEverywhere
To make Toolbar work lower API 11 use Theme.AppCompat.Light.NoActionBar (instead windowActionBar set to false)
<style name="NoActionBarTheme" parent="Theme.AppCompat.Light.NoActionBar">
...
</style>
2. Material Design Library
Here is Material Design Library for pretty buttons, etc.. Currently it's heavily developed.
Guide, code, example - https://github.com/navasmdc/MaterialDesignLibrary
Guide how to add library to Android Studio 1.0 - How do I import material design library to Android Studio?
.
Hope it helps :)