<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
        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:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        tools:openDrawer="start">

    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

        <include layout="@layout/toolbar"/>

        <FrameLayout
                android:id="@+id/main_frag_cont"
                android:layout_width="match_parent"
                android:layout_height="match_parent"/>
    </LinearLayout>

    <android.support.design.widget.NavigationView
            android:id="@+id/nav_view"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:fitsSystemWindows="true"
            app:headerLayout="@layout/nav_header_main"
            app:menu="@menu/nav_drawer"/>
</android.support.v4.widget.DrawerLayout>

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
        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:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        tools:openDrawer="start">

    <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        <android.support.design.widget.AppBarLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:theme="@style/AppTheme.AppBarOverlay">

            <include layout="@layout/toolbar"/>
        </android.support.design.widget.AppBarLayout>

        <FrameLayout
                android:id="@+id/main_frag_cont"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginTop="?attr/actionBarSize"/>
    </FrameLayout>

    <android.support.design.widget.NavigationView
            android:id="@+id/nav_view"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:fitsSystemWindows="true"
            app:headerLayout="@layout/nav_header_main"
            app:menu="@menu/nav_drawer"/>
</android.support.v4.widget.DrawerLayout>

Make the fragments' toolbar have elevation (add shadow)
Make the fragments' toolbar have elevation (add shadow)

