Android: Accommodate CoordinatorLayout

I put a CoordinatorLayout but according to me it already fits as it should be seen but what happens is that the TextView and the GridView that I have are placed on top of each other, the coordinatorLayout I require it in the top and bottom TextView and GridView

  <?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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.tritonix.scotproyect.MainActivity"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    <android.support.design.widget.CoordinatorLayout
        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"
        android:fitsSystemWindows="true"
        tools:context="com.sample.foo.usingcoordinatorlayout.FabAndSnackbarActivity">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/appBar"
            android:layout_width="match_parent"
            android:layout_height="300dp"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            android:fitsSystemWindows="true">

            <android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/collapsingToolbar"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_scrollFlags="scroll|exitUntilCollapsed"
                android:fitsSystemWindows="true"
                app:contentScrim="?attr/colorPrimary"
                app:expandedTitleMarginStart="48dp"
                app:expandedTitleMarginEnd="64dp"
                app:title="Hola">

                <ImageView
                    android:id="@+id/toolbarImage"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:scaleType="centerCrop"
                    android:fitsSystemWindows="true"
                    android:src="@drawable/pic1"
                    app:layout_collapseMode="parallax" />

                <android.support.v7.widget.Toolbar
                    android:id="@+id/toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                    app:layout_collapseMode="pin" />
            </android.support.design.widget.CollapsingToolbarLayout>
        </android.support.design.widget.AppBarLayout>

        <android.support.v4.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textSize="28sp"
                android:lineSpacingExtra="8dp"
                android:text="Bienvenido"
                android:padding="@dimen/activity_horizontal_margin" />
        </android.support.v4.widget.NestedScrollView>

        <android.support.design.widget.FloatingActionButton
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:layout_margin="@dimen/activity_horizontal_margin"
            android:src="@drawable/pic1"
            app:layout_anchor="@id/appBar"
            app:layout_anchorGravity="bottom|end" />
    </android.support.design.widget.CoordinatorLayout>

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

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#fff"
            android:elevation="4dp"
            android:id="@+id/data_checkin" />

        <GridView
            android:id="@+id/grid_view"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:columnWidth="300dp"
            android:drawSelectorOnTop="true"
            android:gravity="center"
            android:numColumns="2"
            android:stretchMode="columnWidth"
            android:verticalSpacing="10dp"
            android:focusable="true"
            android:clickable="true" />

    </LinearLayout>

    </RelativeLayout>

    <com.sa90.materialarcmenu.ArcMenu
        android:id="@+id/arcmenu_android_example_layout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        app:menu_color="@android:color/holo_blue_dark"
        app:menu_open="arc_right"
        app:menu_scr="@android:drawable/ic_dialog_dialer">

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab_home"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/home"
            android:tint="#FFF"
            app:backgroundTint="@android:color/holo_blue_dark" />

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab_picture"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/picture"
            android:tint="#FFF"
            app:backgroundTint="@android:color/holo_blue_dark" />

    </com.sa90.materialarcmenu.ArcMenu>
</RelativeLayout>