Adding a floating button to a layout with a navigation box and toolbar

Question

I was able to create an application with toolbarand rolling navigation drawerwith recycleView.

Now I'm trying to add Floating action button, but I can not find a suitable place to add a button.

I am trying to add fab to the bottom right.

Below is my activity_main.xml file

     <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">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <LinearLayout
            android:id="@+id/container_toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <include
                android:id="@+id/toolbar"
                layout="@layout/toolbar" />
        </LinearLayout>

        <FrameLayout
            android:id="@+id/container_body"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_weight="1" />

    </LinearLayout>

    <fragment
        android:id="@+id/fragment_navigation_drawer"
        android:layout_width="280dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:layout="@layout/fragment_navigation_drawer"
        tools:layout="@layout/fragment_navigation_drawer" />

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

And the Fragmentlayout file fragment_navigtion_drawer.xml

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/drawerColor">

    <LinearLayout
        android:id="@+id/containerDrawerImage"
        android:layout_width="match_parent"
        android:layout_height="140dp"
        android:layout_alignParentTop="true"
        android:orientation="vertical"
        android:background="@drawable/drawertitlebackground">

        <ImageView
            android:id="@+id/drawerAppImage"
            android:layout_width="90dp"
            android:layout_height="90dp"
            android:layout_marginTop="5dp"
            android:src="@mipmap/ic_launcher"
            android:layout_gravity="center"

             />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:layout_marginLeft="5dp"
            android:text="Make search easy"
            android:id="@+id/drawerSubTitle"
            android:textStyle="bold|italic"
            android:layout_centerVertical="true"
            android:layout_gravity="bottom|center"
            android:textColor="@color/textColorPrimary" />

        <ImageButton
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:layout_marginRight="10dp"
            android:layout_gravity="bottom|right"
            android:src="@android:drawable/ic_menu_preferences"/>

    </LinearLayout>
    <android.support.v7.widget.RecyclerView
        android:id="@+id/drawerList"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_below="@+id/containerDrawerImage" />

</RelativeLayout>

Below is the FAB code

<android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignBottom="@id/container_body"
        android:layout_gravity="right"
        android:layout_marginRight="10dp"
        app:rippleColor="#F06292"/>

I am trying to put this in Linearlayoutin FrameLayoutto a activity_main.xmlfile. I could see the button being displayed at the bottom right. But when I launch the application, a rectangular bar with the same height is displayed there, which hides the content behind it. A rectangular bar covers from left to right, including the fab button, but the fab button on top.

- Fragment Listview. , , .

, Fragment i.e. Listview .

, .

: , activity_main.xml . FAB. .

    <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">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <LinearLayout
            android:id="@+id/container_toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <include
                android:id="@+id/toolbar"
                layout="@layout/toolbar" />
        </LinearLayout>

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

            <FrameLayout
                android:id="@+id/container_body"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                 android:layout_weight="1"/>

            <android.support.design.widget.FloatingActionButton
                android:id="@+id/fab"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_alignBottom="@id/container_body"
                android:layout_gravity="bottom|right"
                android:layout_marginRight="10dp"
                android:layout_marginBottom="6dp"
                app:fabSize="normal"
                android:src="@drawable/ic_add_white_24dp"

                app:backgroundTint="@color/colorPrimaryDark"
                app:rippleColor="#F06292"/>

        </FrameLayout>


    </LinearLayout>

    <fragment
        android:id="@+id/fragment_navigation_drawer"
        android:layout_width="280dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:layout="@layout/fragment_navigation_drawer"
        tools:layout="@layout/fragment_navigation_drawer" />

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