Raised Button

From google material design documentation.

A typically rectangular material button that lifts and displays ink reactions on press.

How to add?

I. In your build.gradle add latest appcompat library.

dependencies {  
    compile 'com.android.support:appcompat-v7:X.X.X' // where X.X.X version
}

II. Make your activity extend android.support.v7.app.AppCompatActivity.

public class MainActivity extends AppCompatActivity {  
    ...
}

III. Declare your Button inside any layout.xml file

<Button  
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button"/>

How to style?

I. Declare custom style in your styles.xml file.

<style name="MyButton" parent="Theme.AppCompat.Light">  
    <item name="colorControlHighlight">@color/indigo</item>
    <item name="colorButtonNormal">@color/pink</item>
</style>  

II. Apply this style to your Button via android:theme attribute.

<Button  
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button"
    android:theme="@style/MyButton"/>

Compatibility issues

I. To change Button color of pressed state you can use colorControlHighlight theme attribute, however it will only affect Lollipop version.

II. Android elevation attribute is only available on Lollipop devices therefore you will not see shadow around Button on pre Lollipop devices.