knigopis/app/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical"
    tools:context="me.vadik.knigopis.MainActivity">

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

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:title="@string/app_name" />

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

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipeRefresh"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">

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

            <android.support.v7.widget.RecyclerView
                android:id="@+id/booksRecyclerView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:listitem="@layout/book" />

            <android.support.v7.widget.RecyclerView
                android:id="@+id/usersRecyclerView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:clipToPadding="false"
                android:paddingBottom="8dp"
                android:paddingTop="8dp"
                tools:listitem="@layout/user"
                tools:visibility="gone" />

            <android.support.v7.widget.RecyclerView
                android:id="@+id/notesRecyclerView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:clipToPadding="false"
                android:paddingBottom="8dp"
                android:paddingTop="8dp"
                tools:listitem="@layout/note"
                tools:visibility="gone" />

            <ProgressBar
                android:id="@+id/booksProgressBar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:alpha="0"
                tools:alpha="1" />

            <TextView
                android:id="@+id/booksPlaceholder"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:alpha="0"
                android:gravity="center"
                android:padding="16dp"
                android:textSize="16sp"
                android:visibility="gone"
                tools:alpha="1"
                tools:text="@string/error_loading_books"
                tools:visibility="visible" />

            <android.support.design.widget.FloatingActionButton
                android:id="@+id/addBookButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="end|bottom"
                android:layout_margin="16dp"
                android:tint="@color/white"
                app:srcCompat="@drawable/ic_add" />

        </FrameLayout>

    </android.support.v4.widget.SwipeRefreshLayout>

    <android.support.design.widget.BottomNavigationView
        android:id="@+id/bottomNavigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="@color/white"
        app:menu="@menu/navigation" />

</LinearLayout>