Develop Reference

Floating Action button is not showing in Android Coordinator Layout

I am new to Android and UI development. I have downloaded latest version of Windows Android studio and did some basic native UI, it worked well. Now, I am trying to develop floating action button UI.
I have added CoordinatorLayout inside ConstraintLayout. FAB is added inside CoordinatorLayout. My FAB is not visible in layout preview.
I see androidx.coordinatorlayout.widget.CoordinatorLayout text in that layout with background color. Please let me know how to fix this
implementation 'com.google.android.material:material:1.2.0'
<androidx.constraintlayout.widget.ConstraintLayout 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"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#F44336"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
tools:ignore="MissingConstraints">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="#color/colorPrimary"
android:src="#drawable/ic_baseline_add_24"
android:layout_gravity="bottom|end"
/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

add constraintTop for your CoordinatorLayout for filling whole screen
app:layout_constraintTop_toTopOf="parent"
or even this will be better
android:layout_width="match_parent"
android:layout_height="match_parent"
with removing all constraints
for test you may also add fixed size FloatingActionButton. if you want to keep wrap_content for FAB then ensure that ic_baseline_add_24 is valid icon with proper size
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
xmlns:app="http://schemas.android.com/apk/res-auto">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F44336"
tools:ignore="MissingConstraints">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="80dp"
android:layout_height="80dp"
android:backgroundTint="#color/colorPrimary"
android:src="#drawable/ic_baseline_add_24"
android:layout_gravity="bottom|end"
/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
in above code ConstraintLayout isn't needed and you may remove it if you aren't planning to make some more complicated layout. RecyclerView may be placed inside CoordinatorLayout just before FAB - at first REcyclerView will be drawn, after that FAB on top of recycler

Try
<?xml version="1.0" encoding="utf-8"?>
<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">
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#F44336"
android:layout_gravity="bottom"
tools:ignore="MissingConstraints">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="104dp"
android:layout_height="107dp"
android:layout_gravity="center"
android:foregroundGravity="center"
android:visibility="visible"
android:src="#drawable/ic_baseline_add_24"
app:backgroundTint="#color/colorPrimary" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</LinearLayout>

Don't use a CoordinatorLayout with android:layout_height="wrap_content" to contain just the FAB:
<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"
android:fitsSystemWindows="true">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rvItems"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#drawable/ic_add_24px" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

Center align ImageButton in landscape mode using ConstraintLayout

TL;DR
I want to center align an ImageButton in a ScrollView and I'm quite happy with the result in portrait mode. However, I can't say the same for landscape mode and any help would be greatly appreciated.
But let me explain
I'm using two layout files here; the first one is the one I use for my MainActivity class, called activity_main.xml. The second one (called fragment_main.xml) gets nested into into the activity_main.xml when the MainActivity loads the MainFragment.
The preview for fragment_main.xml looks quite promising for portrait and landscape mode:
fragment_main.xml in landscape
fragment_main.xml in portrait
And the rendering of activity_main.xml in portrait mode looks just how I want it to look:
activity_main.xml in portrait
However, activity_main.xml in landscape mode looks odd and I can't figure out why:
activity_main.xml in landscape
Here is the XML of activity_main.xml with fragment_main.xml merged into it as a child of the ScollView:
<?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"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:titleTextAppearance="#style/Toolbar.TitleText"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<ScrollView
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="?attr/actionBarSize"
app:layout_constraintTop_toBottomOf="#id/toolbar"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<!-- Content of fragment_main.xml -->
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingStart="50dp"
android:paddingEnd="50dp"
tools:context=".MainFragment">
<ImageButton
android:id="#+id/overlay_button"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#null"
android:contentDescription="#string/start_speedometer"
android:scaleType="fitCenter"
android:src="#drawable/btn_circle_green"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<TextView
android:id="#+id/overlay_button_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="false"
android:text="#string/start_speedometer"
android:textColor="#color/white"
android:textSize="40sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.navigation.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="false"
app:menu="#menu/nav_drawer_view"
app:headerLayout="#layout/nav_drawer_header"
app:itemIconTint="#drawable/nav_drawer_item_icon_color"
app:itemTextColor="#drawable/nav_drawer_item_text_color" />
</androidx.drawerlayout.widget.DrawerLayout>
I'm looking for a solution where I only have to make changes to fragment_main.xml (that is, everything inside the ScollView). The solution should be involving XML only.
What I've tried
I've tried fiddling with app:layout_constraintDimensionRatio (W,1:1, H,1:1), app:layout_constrainedHeight, app:layout_constraintHeight_max, layout_constraintHeight_min, many other constraints and even tried nesting the content of fragment_main.xml in other layouts, moved from ConstraintLayout to RelativeLayout, LinearLayout and FrameLayout but none of them give me the desired result and ConstraintLayout is the one that came the closest.
Possible solution
The only solution that worked so far was using app:layout_constraintWidth_default="percent" and app:layout_constraintWidth_percent="0.5" resulting in
desired look of activity_main.xml in landscape
While this might look great on a 16:9 phone it might result in the same issues as before on phones with different aspect ratio. So I'm looking for a more generic approach.
Additional details
This is the content of the drawable btn_circle_green.xml I'm using for the button:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="#drawable/ic_circle_green_pressed" />
<item android:state_focused="true" android:drawable="#drawable/ic_circle_green_focused" />
<item android:state_selected="true" android:drawable="#drawable/ic_circle_green_focused" />
<item android:drawable="#drawable/ic_circle_green_default" />
</selector>
With each ic_circle_green_* being a vector asset like this with differing colors:
<vector
android:viewportWidth="300"
android:viewportHeight="300"
android:height="120dp"
android:width="120dp"
xmlns:android="http://schemas.android.com/apk/res/android">
<path android:fillColor="#color/green"
android:pathData="M150,150m-140,0a140,140 0,1 1,280 0a140,140 0,1 1,-280 0"
android:strokeWidth="5"
android:strokeColor="#color/green_light"/>
</vector>
Many thanks in advance!

After I understood that the ScrollView is the element that's causing me headaches (thanks again, #glucaio!) I found this answer and was able to solve my problem.
The ScrollView received android:fitsSystemWindows="true", the inner ConstraintLayout had its attributes for width and height switched (android:layout_width="wrap_content" and android:layout_height="match_parent"), received a paddingTop and paddingBottom (instead of paddingStart and paddingEnd) and was wrapped in a LinearLayout:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center" />
This solution only works for landscape mode. So I'm using the one in this answer for landscape and the one from my question for portrait mode.
This is how the final XML for landscape mode looks like:
Rendered activity_main.xml
And this is the actual XML:
<?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"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:titleTextAppearance="#style/Toolbar.TitleText"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<ScrollView
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="?attr/actionBarSize"
android:fillViewport="true"
app:layout_constraintTop_toBottomOf="#id/toolbar"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent">
<!-- Content of fragment_main.xml -->
<LinearLayout
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center"
tools:context=".MainFragment">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center"
android:paddingTop="30dp"
android:paddingBottom="30dp">
<ImageButton
android:id="#+id/overlay_button"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#null"
android:contentDescription="#string/start_speedometer"
android:scaleType="fitCenter"
android:src="#drawable/btn_circle_green"
app:layout_constraintDimensionRatio="1:1"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
<TextView
android:id="#+id/overlay_button_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="false"
android:text="#string/start_speedometer"
android:textColor="#color/white"
android:textSize="40sp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.navigation.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="false"
app:menu="#menu/nav_drawer_view"
app:headerLayout="#layout/nav_drawer_header"
app:itemIconTint="#drawable/nav_drawer_item_icon_color"
app:itemTextColor="#drawable/nav_drawer_item_text_color" />
</androidx.drawerlayout.widget.DrawerLayout>

Prevent AppBarLayout.ScrollingViewBehavior from adding top margin to the view?

I'm trying to achieve a layout where my view will extend all the way across the screen, under the ActionBar, and the ActionBar will be transparent. I also need the ActionBar and BottomNavigationView to hide on scroll, so I'm using CoordinatorLayout.
I'm using the AppCompat theme with the attribute <item name="windowActionBarOverlay">true</item> in order to have my views extend under the ActionBar. However, after adding app:layout_behavior="#string/appbar_scrolling_view_behavior" to my container Fragment, the view gets placed below the ActionBar.
Is there a way to prevent this part of the appbar_scrolling_behaviour? I've tried without the behaviour, but the scrolling of the AppBar is not synced witht he RecyclerView scrolling underneath it. Thank you!
Here's a gif of the problem
P.S.: I'm trying to use the Android Navigation Component, so I'm following a single activity, multi fragment architecture, if that matters.

Try this code and make some changes because i used androidx..
make main layout like this way..
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="#color/white">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/white"
android:theme="#style/MyToolbar"
app:contentInsetStart="0dp"
app:contentInsetStartWithNavigation="0dp"
app:titleTextAppearance="#style/MyToolbar">
<ImageView
android:id="#+id/headerIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/_6sdp"
android:src="#drawable/ic_edit_location_black"
android:visibility="gone" />
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/_6sdp">
<TextView
android:id="#+id/header"
style="#style/MyToolbar"
android:layout_width="wrap_content"
android:layout_height="?attr/actionBarSize"
android:gravity="center_vertical"
android:textColor="#color/primary"
app:layout_constraintStart_toStartOf="parent" />
<ImageView
android:id="#+id/ivSearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="#dimen/_10sdp"
android:src="#drawable/search_icon"
android:visibility="gone"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
<FrameLayout
android:id="#+id/activity_main_container"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toTopOf="#+id/bottomContainer"
app:layout_constraintTop_toBottomOf="#+id/appBarLayout" />
<RelativeLayout
android:id="#+id/bottomContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="#+id/bvTabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/Widget.BottomNavigationView"
app:itemIconTint="#drawable/navigation_drawable_tint"
app:itemTextColor="#drawable/navigation_drawable_tint"
app:menu="#menu/bottom_menu_item" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

Overide couple images over toolbar foreground image

I have next layout:
UPDATED CODE
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/window_background_color"
android:clickable="false">
<!-- Toolbar -->
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="0dp"
android:layout_height="60dp"
android:elevation="1dp"
android:foreground="#drawable/titlebar_1"
android:foregroundGravity="center|fill"
android:minHeight="?attr/actionBarSize"
android:titleTextAppearance="#color/white"
app:layout_constraintBottom_toTopOf="#+id/test"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:popupTheme="#style/Theme.AppCompat">
</android.support.v7.widget.Toolbar>
<!-- tips&tricks -->
<ImageView
android:id="#+id/imageView3"
android:layout_width="247dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
ads:layout_constraintBottom_toTopOf="#+id/test"
ads:layout_constraintEnd_toEndOf="parent"
ads:layout_constraintStart_toStartOf="#+id/toolbar"
ads:srcCompat="#drawable/common_google_signin_btn_text_dark_focused" />
<RelativeLayout
android:id="#+id/test"
android:layout_width="0dp"
android:layout_height="33dp"
android:background="#1c3049"
android:orientation="horizontal"
ads:layout_constraintBottom_toTopOf="#+id/map"
ads:layout_constraintEnd_toEndOf="parent"
ads:layout_constraintHorizontal_bias="0.0"
ads:layout_constraintStart_toStartOf="parent"
ads:layout_constraintTop_toBottomOf="#+id/toolbar">
</RelativeLayout>
</android.support.constraint.ConstraintLayout>
I need to display 3 images over toolbar foreground image. But all my tries have fail.
I need to add three transparent buttons image over red area. Actual ImageView is hide by toolbar image. How can I put it on top of toolbar ?
Any advice for me?

Collapsing Toolbar Layout and Constraint Layout

I am struggling to create collapsing image header alongside Constraint where my design looks like this
Currently the profile pic is a part of the ConstraintLayout because it needs Guideline constraints and unfortunately it is overlapped by the AppBarLayout
Any ideas how to achieve that?
Can't find any source regarding my combination of layouts.....
<?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.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/playerViewBg"
android:fitsSystemWindows="false">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/bgIV"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
android:src="#drawable/header_bg" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/playerIV"
android:layout_width="177dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="62dp"
android:adjustViewBounds="true"
android:scaleType="fitCenter"
android:src="#drawable/profilePic"
app:layout_constraintEnd_toStartOf="#+id/guideline2"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintStart_toStartOf="#+id/guideline"
app:layout_constraintTop_toTopOf="parent" />
<!-- Other content -->
<android.support.constraint.Guideline
android:id="#+id/guideline"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.27" />
<android.support.constraint.Guideline
android:id="#+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_percent="0.73" />
</android.support.constraint.ConstraintLayout>
</android.support.design.widget.CoordinatorLayout>

Following is the snippet of my working layout:
Please make sure that you haven't make any childview height to match parent(0 dp) inside constrianlayout also for scroll view android:fillViewport="true". Ask me if any doubt Occur.
<android.support.design.widget.CoordinatorLayout
android:id="#+id/coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:fitsSystemWindows="false">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/ivImagec"
android:layout_width="wrap_content"
android:layout_height="#dimen/_90sdp"
android:contentDescription="#string/no_des"
android:scaleType="centerCrop"
app:srcCompat="#drawable/outdoorgames" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:id="#+id/scroll_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="#dimen/_90sdp"
android:fillViewport="true">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="#+id/cvLayout"
android:animateLayoutChanges="true">
....
</android.support.constraint.ConstraintLayout>

I've actually recently started thinking about this
And based on this talk here from two of the devs behind Android Studio :
https://www.youtube.com/watch?v=8lAXJ5NFXTM (at the 21 mins: 28 seconds mark)
It is definitely possible, they recommend replacing the CollapsingToolbarLayout completely with the ConstraintLayout.