anotherim/src/main/res/layout/activity_start_conversation.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android" >
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.v4.view.ViewPager
            android:id="@+id/start_conversation_view_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="?attr/color_background_primary"/>
        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end|bottom"
            android:src="?attr/icon_add_person"
            android:layout_margin="16dp" />
    </FrameLayout>
</layout>