FloatingActionButton for Android (SDK 24)

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="org.anyspirit.nsetting.MainActivity">

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="@dimen/base_margin"
        android:layout_marginEnd="@dimen/base_margin"
        android:layout_alignParentEnd="true"
        android:layout_alignParentBottom="true"
        android:src="@android:drawable/fab"
        app:fabSize="normal"
        app:elevation="4dp"
        app:backgroundTint="@color/fab" />

    <!-- app:elevation : for shadow -->

</RelativeLayout>

build.gradle

dependencies {
    ...

    compile 'com.android.support:design:24.2.0'
}