'how to hide toolbar in layout having framelayout, fragment drawer layout in activity and scrollview in corresponding fragment

This is my activity xml. Nothing is happening when scrolling.I need the toolbar to disappear when user starts scrolling and make it appear when scrolls to top.

    <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">

        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/parent"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/post_ad_bg"
            android:orientation="vertical">

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

                <include
                    layout="@layout/toolbar_homepage"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />
            </android.support.design.widget.AppBarLayout>

            <com.abc.customviews.CustomDrawerLayout
                android:id="@+id/drawer_layout"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <FrameLayout
                    android:id="@+id/container"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                  app:layout_behavior="@string/appbar_scrolling_view_behavior" />

                <fragment
                    android:id="@+id/navigation_drawer"
                    android:name="com.fragments.SideMenuFragment"
                    android:layout_width="@dimen/navigation_drawer_width"
                    android:layout_height="match_parent"
                    android:layout_gravity="start" />

            </com.abc.customviews.CustomDrawerLayout>

        </LinearLayout>

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

And this is my fragment xml where I am having a scrollview. I tried replacing with Nestedscrollview and still its not working. Any help appreciated.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mainLayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/scrollView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scrollbars="none">

        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/parentLayout"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:nestedScrollingEnabled="false"
            android:orientation="vertical">

        </LinearLayout> 

    </ScrollView>

    <RelativeLayout
        android:id="@+id/rlProgressBar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/white_transparent_50"
        android:visibility="gone">

        <ProgressBar
            android:layout_width="@dimen/dimen_100_dp"
            android:layout_height="@dimen/dimen_100_dp"
            android:layout_centerInParent="true"
            android:indeterminateDrawable="@drawable/custom_progress_background" />

    </RelativeLayout>
</RelativeLayout>

Solution 1:^[1]

<?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:gravity="center"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    tools:context=".DashboardActivity">

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

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@android:color/transparent"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar_main"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="#E4171212"
            app:layout_scrollFlags="scroll|enterAlways|snap"
            app:popupTheme="@style/AppTheme.PopupOverlay"

            />



    </com.google.android.material.appbar.AppBarLayout>

        <FrameLayout
            android:id="@+id/content"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            android:layout_below="@id/appbar" />



        <com.google.android.material.bottomnavigation.BottomNavigationView
            android:layout_gravity="bottom"
            android:id="@+id/navigation"
            app:labelVisibilityMode="labeled"
            android:background="?android:attr/windowBackground"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:menu="@menu/menu_nav"/>

    </androidx.coordinatorlayout.widget.CoordinatorLayout>



</RelativeLayout>

Solution 2:^[2]

Add app:layout_behavior="@string/appbar_scrolling_view_behavior" to your FrameLayout like this

    <FrameLayout
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
         />

Sources

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Solution	Source
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Solution 2	OneKe

'how to hide toolbar in layout having framelayout, fragment drawer layout in activity and scrollview in corresponding fragment

Solution 1:[1]

Solution 2:[2]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]