Bottom App Bar

layout.xml

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
  
    <!-- Other components and views -->
  
    <android.support.design.bottomappbar.BottomAppBar
        android:id="@+id/bottomAppBar"
        android:layout_width="match_parent"
        android:layout_height="?actionBarSize"
        android:layout_gravity="bottom"
        app:backgroundTint="@color/yourColorValue"
        app:buttonGravity="bottom|top"
        app:fabAlignmentMode="end"
        app:navigationIcon="@drawable/ic_back" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/setWallpaper"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_wallpaper"
        app:backgroundTint="@color/colorPrimary"
        app:fabSize="normal"
        app:layout_anchor="@id/bottomAppBar" />

</android.support.design.widget.CoordinatorLayout>