Develop Reference

How do I add adView outside of scrollview in android studio?

I am trying to add a banner add at the bottom of my app but I don't know how to put it so that it is not affected by the scrollview. I want it to sit at the bottom of my screen without it being
affected by the scroll effect how do I do this, when I try putting the AdView code outside the ScrollView it doesn't work.
This is how my activity_main.xml looks like
<ScrollView 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/grey"
tools:context=".MainActivity">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.cardview.widget.CardView
android:layout_margin="16dp"
app:cardCornerRadius="8dp"
app:cardElevation="8dp"
app:cardBackgroundColor="#color/blue"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.appcompat.widget.SearchView
android:id="#+id/search_view"
app:defaultQueryHint="Search..."
app:iconifiedByDefault="false"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"/>
</androidx.cardview.widget.CardView>
<LinearLayout
android:layout_margin="16dp"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView_a"
android:textSize="24sp"
android:text="A"
android:textColor="#color/blue"
android:textAlignment="center"
android:padding="8dp"
android:textStyle="italic"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_a"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView
android:textSize="24sp"
android:text="B"
android:textColor="#color/blue"
android:textAlignment="center"
android:padding="8dp"
android:textStyle="italic"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_b"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:orientation="vertical">
<com.google.android.gms.ads.AdView xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="#+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
ads:adSize="SMART_BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111">
</com.google.android.gms.ads.AdView>
</LinearLayout>
</LinearLayout>

This is my suggestion: Put scrollview inside constrainLayout, like this:
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent" ...>
<ScrollView
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="#+id/view"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" ...>
//main layout here
</LinearLayout>
</ScrollView>
<AdView
android:id="#+id/view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Make your parent layout to LinearLayout, add the AdView to be on the top (width to match the parent and the height to wrap content), add your scrollView (width and height to match parent)
The xml will look like this
<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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<AdView
android:id="#+id/view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toTopOf="#+id/view"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
// your layout.
</ScrollView>
</LinearLayout>

collapsingtoolbarlayout recyclerview working separately

Collapsing toolbar layout and the recycler view should work together while swiping but working separately.
suggest to me what to do! given below are my code and resulting gif part of my project.
the toolbar layout is not showing fully if I swipe the screen from bottom to top.
the toolbar layout is closed and only return if I swipe to toolbar layout separately.
i want to toolbar layout to be in the same manner when i swipe the screen up and down.
Code of my layout
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.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"
tools:context=".ui.review.reviewActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collaps_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:expandedTitleTextAppearance="#android:color/transparent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:titleEnabled="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="150dp"
android:gravity="center_vertical"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:contentDescription="TODO"
android:src="#drawable/cover_image"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_collapseMode="parallax">
<TextView
android:id="#+id/textView_title"
android:layout_width="wrap_content"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="center_horizontal"
android:layout_marginTop="130dp"
android:gravity="center"
android:maxLines="1"
android:text="title"
android:textColor="#FFF"
android:textSize="24sp" />
</FrameLayout>
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:theme="#style/Theme.AppTheme.PopupOverlay"
app:layout_collapseMode="parallax" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/review_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fadeScrollbars="false"
android:scrollbars="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</RelativeLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Final result

Try this:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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/itineraryListFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?android:windowBackground">
<androidx.coordinatorlayout.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">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways">
<Button
android:id="#+id/button_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/activity_start_margin"
android:layout_marginTop="#dimen/_20sdp"
android:layout_marginEnd="#dimen/activity_end_margin"
android:background="#null"
android:clickable="true"
android:drawableStart="#drawable/ic_arrow_booking_details"
android:gravity="start|center_vertical" />
<ImageView
android:id="#+id/iv_background_image"
android:layout_width="match_parent"
android:layout_height="#dimen/_123sdp"
android:contentDescription="#string/name_app"
android:scaleType="centerCrop"
app:srcCompat="#drawable/booking_details_background" />
<ImageView
android:id="#+id/iv_background_rectangle"
android:layout_width="match_parent"
android:layout_height="#dimen/_123sdp"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"
app:srcCompat="#drawable/rectangle_booking_details" />
<TextView
android:id="#+id/tv_background_title"
style="#style/font_title_bookingdetails"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/activity_start_margin"
android:layout_marginTop="95dp"
android:layout_marginEnd="#dimen/activity_end_margin"
android:gravity="start|center_vertical"
android:text="#string/text_trek_everest_name"
android:textColor="#color/colorPrimary" />
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="26dp" />
<androidx.appcompat.widget.Toolbar
android:layout_width="?attr/actionBarSize"
android:layout_height="wrap_content"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/tv_title_itinerary_list"
style="#style/font_title_day1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/activity_start_margin"
android:layout_marginTop="#dimen/_15sdp"
android:layout_marginBottom="#dimen/activity_end_margin"
android:gravity="center_vertical"
android:text="#string/dashboard_itinerary"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.235" />
<include layout="#layout/booking_itinerary_recyclerview" />
</LinearLayout>
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</FrameLayout>
This is the output of this code.

NestedScrollView not showing inside CoordinatorLayout

I have CoordinatorLayout with NestedScrollView and CollapsingToolbarLayout. I put everything inside CollapsingToolbarLayout which i want to show on screen first then add NestedScrollView to show more content but NestedScrollView is not visible on screen.
Here is my XML Layout
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:fitsSystemWindows="true"
android:clipToPadding="false"
android:background="?android:attr/colorBackground"
android:id="#+id/viewuserProfileMain"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="#+id/relativeParent"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/upCoverPhoto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/redName"/>
<!--PUT TOOLBAR HERE-->
<RelativeLayout
android:id="#+id/upDetails"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/diagonal_cut_layerlist"
android:elevation="12dp"
android:translationZ="12dp"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginTop="115dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="115dp"
android:layout_marginRight="10dp"
android:gravity="end"
android:orientation="horizontal">
<Button
android:id="#+id/Button_FollowFriends"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#style/AppButton"
android:text="Follow"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<de.hdodenhof.circleimageview.CircleImageView
android:id="#+id/profilePicture_Cut"
android:layout_width="80dp"
android:layout_height="80dp"
android:src="#drawable/baby"
app:civ_border_width="2dp"
app:civ_border_color="#color/primary"
android:layout_marginTop="85dp"
android:layout_marginLeft="15dp"/>
<TextView
android:id="#+id/upUserName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/secondary_text"
android:layout_marginTop="10dp"
android:textSize="28sp"
android:layout_marginLeft="10dp"
android:text="Susan Ledger"/>
<TextView
android:id="#+id/upUserCity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableLeft="#drawable/home"
android:drawablePadding="5dp"
android:layout_marginTop="5dp"
android:layout_marginLeft="10dp"
android:textSize="18sp"
android:textColor="#color/secondary_text"
android:text="Delhi,India"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:gravity="center"
android:orientation="horizontal"
android:weightSum="3">
<Button
android:id="#+id/Button_AddFriend"
android:layout_width="0dp"
android:layout_height="wrap_content"
style="#style/AppButton"
android:text="Add Friend"
android:layout_weight="1"/>
<Button
android:id="#+id/Button_RejectRequest"
android:layout_width="0dp"
android:layout_height="wrap_content"
style="#style/AppButton"
android:text="Reject"
android:layout_weight="1"/>
<Button
android:id="#+id/Button_MessageFriend"
android:layout_width="0dp"
android:layout_height="wrap_content"
style="#style/AppButton"
android:text="Message"
android:layout_weight="1"/>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/up_NestedScrollView"
android:fillViewport="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="5dp"
android:paddingRight="5dp"
>
<!--To show tab on top of view pager-->
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="scrollable"
app:tabTextColor="#color/place_autocomplete_prediction_primary_text_highlight"
app:tabSelectedTextColor="#color/primary_text"
app:tabIndicatorColor="#color/primary_light"
android:id="#+id/up_Viewpager_Tab">
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/userProfile_Viewpager_Tab"
android:id="#+id/up_Viewpager_ViewPager">
</android.support.v4.view.ViewPager>
</RelativeLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

try give
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:fitsSystemWindows="true">
Because AppBar could not be match_parent

Give wrap_content in height of your AppBarLayout
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
And
`android:fitsSystemWindows="false"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"`
these lines to your CollapsingToolbarLayout

android - collapsing toolbar and fragment layout not working together

In my app I have two fragments and a MainActivity. The activity_main.xml contains a collapsing toolbar which works perfectly for me when the fragments are empty. In my first fragment I fetch json data from a server and put it into a listview inside the fragment activity. The data is fetched and shown correctly, but the listview takes the whole screen and my collapsing toolbar seems to be a little buggy, like sometimes it pops up and disappears and my listview is not scrollable anymore. The two activities aren’t working together at all. Is there a way to make them work together?
My activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<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">
<android.support.design.widget.AppBarLayout
android:id="#+id/appBar"
android:layout_width="match_parent"
android:layout_height="150dp"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:expandedTitleGravity="center|bottom"
app:expandedTitleMarginBottom="56dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:toolbarId="#+id/toolbar">
<ImageView
android:id="#+id/backg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="#drawable/backthree"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:layout_marginBottom="48dp"
android:gravity="right"
app:layout_collapseMode="pin"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/frame_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/navigation"
android:animateLayoutChanges="true">
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#android:color/white"
android:text="TextView" />
<TextView
android:id="#+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:textColor="#android:color/white"
android:text="TextView" />
</FrameLayout>
<android.support.v4.widget.NestedScrollView
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
</RelativeLayout>
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom"
android:background="#android:color/white"
app:itemIconTint="#android:color/darker_gray"
app:itemTextColor="#android:color/darker_gray"
app:menu="#menu/navigation" >
</android.support.design.widget.BottomNavigationView>
</android.support.design.widget.CoordinatorLayout>
My fragment_first.xml:
<RelativeLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorGrayHell"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp">
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/swipe_refresh_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ListView
android:id="#+id/list"
android:layout_marginLeft="7dp"
android:layout_marginRight="7dp"
android:layout_marginTop="10dp"
android:layout_width="fill_parent"
android:background="#android:color/white"
android:dividerHeight="10dp"
android:divider="#color/colorGrayHell"
android:layout_height="wrap_content" />
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
</RelativeLayout>

You haven't mentioned where the fragments are attached - I assume within the NestedScrollView? If not, that's where they should go.
The problem is most likely the ListView within the fragment - unlike a RecyclerView, it does not implement NestedScrollingChild2 and ScrollingView, which are required for the collapsing toolbar functionality.
Replace the ListView with a RecyclerView and make sure the fragments are within the NestedScrollView that has app:layout_behavior="#string/appbar_scrolling_view_behavior" and it should work.

<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/background_light"
android:fitsSystemWindows="true">
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#fcfcfc"
android:gravity="center"
android:orientation="vertical"
android:padding="10dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Yogesh" />
</LinearLayout>
</androidx.core.widget.NestedScrollView>
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/main.appbar"
android:layout_width="match_parent"
android:layout_height="300dp"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/main.collapsing"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:id="#+id/main.backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="#drawable/bg1"
app:layout_collapseMode="parallax" />
<androidx.appcompat.widget.Toolbar
android:id="#+id/main.toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:visibility="gone"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:title="Test"
/>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Use this code.
And also you need to change color of tollbar which swutching fragment.
toolbar.setBackgroundColor(ContextCompat.getColor(getApplicationContext(), android.R.color.transparent));
mFragmentToSet = new HomeDashboardFragment();

android - collapsing toolbar with tablayout set background

My app contains a collapsing toolbar with a tabview. The tabs have an own background color, my #color/colorPrimary and the collapsing toolbar has a set background image. Now I would like to 'merge' them: the tablayout should be transparent, so the background image reaches from the toolbar down including the tabs. Like it is not divided by the background anymore.
I set up the layout and tried to make the tabs transparent, but like this the image won't continue.
My XML file:
<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.example.te.e6.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/colbar"
android:layout_width="match_parent"
android:layout_height="175dp"
app:expandedTitleGravity="center|bottom"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:id="#+id/backg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="#drawable/materialbackground"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:expandedTitleGravity="center|bottom"
app:layout_collapseMode="pin"
app:popupTheme="#style/AppTheme.PopupOverlay"/>
</android.support.design.widget.CollapsingToolbarLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
app:layout_anchor="#id/appBar"
app:layout_anchorGravity="bottom">
<android.support.design.widget.TabItem
android:id="#+id/tabItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="A" />
<android.support.design.widget.TabItem
android:id="#+id/tabItem2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B" />
<android.support.design.widget.TabItem
android:id="#+id/tabItem3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="C" />
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>

I have also been searching for a solution and I stumbled across this approach that helped me a bit. Finally I got it working. Here I post my solution using the latest Material3:
<layout xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:id="#+id/list_appbarlayout_tabs">
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/list_collapsing_toolbar_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
app:contentInsetStart="0dp"
app:layout_scrollFlags="scroll|enterAlways|snap">
<com.google.android.material.tabs.TabLayout
android:id="#+id/tablayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed">
<com.google.android.material.tabs.TabItem
android:id="#+id/tab1"
android:layout_width="wrap_content"
android:layout_height="20dp" />
<com.google.android.material.tabs.TabItem
android:id="#+id/tab2"
android:layout_width="wrap_content"
android:layout_height="40dp"/>
<com.google.android.material.tabs.TabItem
android:id="#+id/tab3"
android:layout_width="wrap_content"
android:layout_height="40dp" />
</com.google.android.material.tabs.TabLayout>
</com.google.android.material.appbar.MaterialToolbar>
</com.google.android.material.appbar.AppBarLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<ImageView
android:id="#+id/list_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:alpha="0.2"
android:padding="24dp"
app:srcCompat="#drawable/bg" />
<com.google.android.material.progressindicator.LinearProgressIndicator
android:id="#+id/list_progress_indicator"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:indeterminate="true" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/list_progress_indicator"
android:layout_marginEnd="8dp">
</androidx.recyclerview.widget.RecyclerView>
</RelativeLayout>
<com.google.android.material.bottomappbar.BottomAppBar
android:id="#+id/list_bottom_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
app:hideOnScroll="true"
app:menu="#menu/bottombar"
/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:contentDescription="#string/list_fab_add_contentdesc"
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
app:layout_anchor="#id/list_bottom_bar"
app:srcCompat="#drawable/ic_add"
/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</layout>
Pay special attention to
app:layout_scrollFlags="scroll|enterAlways|snap">
For the Material Toolbar
and
app:layout_behavior="#string/appbar_scrolling_view_behavior">
for the relative layout!
EDIT:
There is a stupid margin at the start of the menu, to get rid of it add app:contentInsetStart="0dp" which is set to 16 dp by default (updated also the layout above)

Here is a working example:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="200dp"
android:fitsSystemWindows="true"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginBottom="56dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:toolbarId="#+id/toolbar">
<ImageView
android:id="#+id/backg"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="#drawable/ic_launcher_background"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_marginBottom="48dp"
app:layout_collapseMode="pin"
app:popupTheme="#style/AppTheme.PopupOverlay" />
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="48dp"
android:layout_gravity="bottom">
<android.support.design.widget.TabItem
android:id="#+id/tabItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="A" />
<android.support.design.widget.TabItem
android:id="#+id/tabItem2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B" />
<android.support.design.widget.TabItem
android:id="#+id/tabItem3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="C" />
</android.support.design.widget.TabLayout>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>