app/src/main/res/layout/activity_navigation.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=".activities.NavigationActivity">
<android.support.design.widget.BottomNavigationView
android:id="@+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="56dp"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:background="?android:attr/windowBackground"
app:menu="@menu/nav_items"/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_above="@id/bottom_navigation"
android:id="@+id/main_frame">
</FrameLayout>
</RelativeLayout>