Custom bottom navigation

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/transparent"
    tools:openDrawer="start"
    android:id="@+id/drawer_layout"
    tools:context=".activities.HomeActivity">


    <com.google.android.material.navigation.NavigationView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:visibility="gone"
        app:menu="@menu/side_nav_menu"
        tools:visibility="gone" />



    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >

        <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:id="@+id/btn_add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/add_plus_vector"
            app:backgroundTint="?android:attr/windowBackground"
            android:elevation="16dp"
            app:fabSize="mini"
            android:clickable="true"
            android:tint="@color/hint_text_color_dark"
            android:backgroundTint="@color/background_color_dark"
            app:layout_anchor="@id/custom_bottom_nav"/>

   

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

        <RelativeLayout
            android:id="@+id/custom_tool_bar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@drawable/gradient_fade_bottom">

            <TextView
                android:id="@+id/user_nickname"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:visibility="gone" />

            <ImageButton
                android:id="@+id/btn_search"
                android:layout_width="25dp"
                android:layout_height="25dp"
                android:layout_alignParentEnd="true"
                android:layout_alignParentBottom="true"
                android:layout_marginEnd="19dp"
                android:background="@drawable/bot_vector"
                android:visibility="visible" />


            <ImageButton
                android:id="@+id/btn_settings"
                android:layout_width="25dp"
                android:layout_height="25dp"
                android:layout_alignParentBottom="true"
                android:layout_alignParentEnd="true"
                android:layout_marginEnd="19dp"
                android:background="@drawable/setting_vector"
                android:visibility="gone"
                tools:visibility="visible" />

            <ImageButton
                android:id="@+id/btn_back"
                android:layout_width="30dp"
                android:layout_height="30dp"
                android:layout_alignParentBottom="true"
                android:layout_marginStart="19dp"
                android:background="@drawable/back"
                android:backgroundTint="?android:attr/textColorPrimary"
                android:visibility="gone"
                tools:visibility="visible" />


        </RelativeLayout>

        <com.google.android.material.bottomappbar.BottomAppBar
            android:id="@+id/custom_bottom_nav"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:layout_gravity="bottom"
            android:theme="@style/Widget.MemePal.BottomAppBar"
            app:fabCradleMargin="3dp"
            app:fabCradleRoundedCornerRadius="40dp">

            <com.google.android.material.bottomnavigation.BottomNavigationView
                android:id="@+id/bottom_nav_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginEnd="20dp"
                android:background="@color/transparent"
                app:itemTextColor="#000000"
                app:itemBackground="@color/transparent"

                app:labelVisibilityMode="unlabeled"
                app:layout_scrollFlags="scroll|enterAlways"
                app:menu="@menu/bottom_nav_menu" />

        </com.google.android.material.bottomappbar.BottomAppBar>

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

</androidx.drawerlayout.widget.DrawerLayout>