Develop Reference

fragment from viewPager hidding behind on tab of action bar

Actually i am trying to build a listView/recyclerView . On scrolling of list the actionbar get hide where action bar is toolbar but the some part of listview is hiding behind the tab. Here i have used AppBarLayout and toolbar having app:layout_scrollFlags="scroll|enterAlways" and in my recylerview have app:layout_behavior="#string/appbar_scrolling_view_behavior" behaviour. I can use linear Layout but problem is for sliding of toolbar the AppBarLayout must be the child of CoordinatorLayout.
My activity having 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"
tools:context="ameyo.genie.activity.HomeActivity">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="50dp">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
app:popupTheme="#style/Theme.AppCompat.Light.DarkActionBar"
app:theme="#style/Toolbar">
<android.support.v7.widget.Toolbar
android:id="#+id/action_bars"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
/>
<ameyo.genie.SlidingTabLayout
android:id="#+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="#color/colorPrimary"
/>
</android.support.design.widget.AppBarLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/home_fab_dial"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:clickable="true"
android:src="#drawable/ic_dialpad_white"
app:layout_anchor="#id/pager"
app:layout_anchorGravity="bottom|center" />
</android.support.design.widget.CoordinatorLayout>
and my fragment having
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
android:id="#+id/main_content"
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">
<android.support.v7.widget.RecyclerView
android:id="#+id/recentcall_recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
</android.support.design.widget.CoordinatorLayout>
Am I doing something wrong in making the toolbar to slide on sliding the listview or there is another way of doing this without using any third library.

try this:
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
app:popupTheme="#style/Theme.AppCompat.Light.DarkActionBar"
app:theme="#style/Toolbar">
<android.support.v7.widget.Toolbar
android:id="#+id/action_bars"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
/>
<ameyo.genie.SlidingTabLayout
android:id="#+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="#color/colorPrimary"
/>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="50dp">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
</android.support.design.widget.AppBarLayout>
When you put your component, order them by the position, every component will be over the precedent, if there's no space !

Thanks to Daniel Nugent that I forgot to write android:layout_below="#+id/sliding_tabs" inside viewpager and also remove framelayout and height must be wrapcontent now my final code is this which is working
<?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"
tools:context="ameyo.genie.activity.HomeActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:elevation="6dp">
<android.support.v7.widget.Toolbar
android:id="#+id/action_bars"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
app:popupTheme="#style/Theme.AppCompat.Light.DarkActionBar"
app:theme="#style/Toolbar"
app:elevation="0dp"
app:layout_scrollFlags="scroll|enterAlways"
/>
<ameyo.genie.SlidingTabLayout
android:id="#+id/sliding_tabs"
android:layout_below="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="?attr/colorPrimary"
app:elevation="0dp"
android:minHeight="?attr/actionBarSize"
/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_below="#+id/sliding_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/home_fab_dial"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:clickable="true"
android:src="#drawable/ic_dialpad_white"
app:layout_anchor="#id/pager"
app:layout_anchorGravity="bottom|center" />
</android.support.design.widget.CoordinatorLayout>

Translucent StatusBar on kitkat with FrameLayout above the Toolbar and using CoordinatorLayout

I was trying to achieve Translucent StatusBar on kitkat with the following FrameLayout and it's working without CoordinatorLayout like this:
Layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:weightSum="1">
<FrameLayout
android:id="#+id/statusbar"
android:layout_width="match_parent"
android:layout_height="25dp"
android:background="#color/colorPrimaryDark" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="2"
android:background="#color/colorPrimary" />
</LinearLayout>
And this line in Styles.xml-v19 of course:
<item name="android:windowTranslucentStatus">true</item>
And of course in the onCreate:
if (Build.VERSION.SDK_INT < 19) {
FrameLayout statusbar = (FrameLayout) findViewById(R.id.statusbar);
statusbar.setVisibility(View.GONE);
}
And that worked:
But, i'm wondering how we can achieve that with CoordinatorLayout and AppbarLayout?
Here is my try by the way:
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/toolbarCollapse"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<FrameLayout
android:id="#+id/statusbar"
android:layout_width="match_parent"
android:layout_height="25dp"
android:background="?attr/colorPrimaryDark" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbarmain"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#color/ColorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ToolbarStylepopuptheme"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" />
</android.support.design.widget.CollapsingToolbarLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:tabIndicatorColor="#android:color/white"
app:tabIndicatorHeight="2dp"
app:tabMode="scrollable" />
</android.support.design.widget.AppBarLayout>
And didn't work.
Update: Also this one is not working:
<?xml version="1.0" encoding="utf-8"?>
<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"
android:fitsSystemWindows="true"
tools:context=".ui.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="#+id/statusBar"
android:layout_width="match_parent"
android:layout_height="25dp"
android:background="#color/colorPrimaryDark"
android:translationZ="8dp" />
<android.support.design.widget.CoordinatorLayout
android:id="#+id/root_coordinator"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.widget.NestedScrollView
android:id="#+id/nestedscrollview"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
...
...
Any solutions to achieve that?
Something like ADM app on GooglePlay design.
Also, let's mention that, i've had the same problem with SystemBarTint when i was using CoordinatorLayout(same condition).
I couldn't figured out how they could do that.
Also, there is a good tutorial here, https://youtu.be/YCThIedqbCQ but it doesn't work for me.

Can you not just do this? It seems like you're moving your faux status bar into the Coordinator layout when you don't need to?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:weightSum="1">
<FrameLayout
android:id="#+id/statusbar"
android:layout_width="match_parent"
android:layout_height="25dp"
android:background="#color/colorPrimaryDark" />
<Coordinator>
<AppBarLayout>
<CollapsibleToolbarLayout>
<Toolbar/>
</CollapsibleToolbarLayout>
</AppBarLayout>
<NestedScrollView/>
</Coordinator>
</LinearLayout>

Toolbar collapse on scroll with Drawer Layout, Coordinator Layout, and Fragments

I'm trying to get the toolbar to collapse on scroll, but no matter what answer I follow I cannot seem to get it to collapse on scroll. The fragment that gets inflated in the FrameLayout is a View Pager if that makes a difference. Any help would be greatly appreciated.
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.bluecadet.android.nasm.MainActivity">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true">
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
app:layout_scrollFlags="scroll|enterAlways"
android:background="#color/primary"
>
<ImageView
android:layout_width="32dp"
android:layout_height="32dp"
android:src="#drawable/home"
/>
</android.support.v7.widget.Toolbar>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
</android.support.design.widget.CoordinatorLayout>
<fragment android:id="#+id/navigation_drawer"
android:layout_width="#dimen/navigation_drawer_width"
android:layout_height="match_parent"
android:layout_gravity="start"
android:name="com.bluecadet.android.nasm.ui.NavigationDrawerFragment"
tools:layout="#layout/fragment_navigation_drawer" />
</android.support.v4.widget.DrawerLayout>

Well i am not talking about any thrid party library, it is included support design library. Your toolbar and image view have to be in CollapsingToolBarLayout
<?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"
tools:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="256dp"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsingToolbarLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimaryDark"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="centerCrop"
android:src="#drawable/abcd"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7" />
<android.support.v7.widget.Toolbar
android:id="#+id/mtool"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>

AppBarLayout + TabLayout + CollapsingToolbarLayout + SwipeToRefresh

I met a lot of issues related with my problem but nobody I found wanted the behaviour I'm looking for.
I want a view pager with tabs and app bar, when the contained fragments are scrollable and are scrolled (toward bottom), I want the app bar to disapear but leave the tabs, when scrolled toward top, to re-apear. some of these fragments contain a SwipeToRefresh Layout (sometimes it causes problems).
I tried a lot of configurations that always leave something wrong.
for now I don't have the collapsing effect (it's always hidden)
<?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"
tools:context=".MainPagerActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_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:layout_scrollFlags="scroll|enterAlways">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabGravity="fill"
app:tabIndicatorHeight="6dp"
app:tabMode="fixed" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/main_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/app_bar_layout"
tools:context=".MainPagerActivity"
/>
</RelativeLayout>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:src="#android:drawable/ic_menu_edit" />
and one of my fragment (the scrolling one) :
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:wheel="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.m360learning.app.fragment.MainPagerNewsFeed">
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.pnikosis.materialishprogress.ProgressWheel
android:id="#+id/progress_wheel"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
wheel:matProg_barColor="#5588FF"
wheel:matProg_progressIndeterminate="true" />
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
</RelativeLayout>
</android.support.v4.widget.SwipeRefreshLayout>
</FrameLayout>
I don't know exactly what I've done but from the time I started write this question the refreshLayout prevent my List from going up (it refreshes instead)..
Thanks
------Correction !
thanks to Sir Ellie Zou, it now works with this 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"
tools:context=".MainPagerActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/app_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabGravity="fill"
app:tabIndicatorHeight="6dp"
app:tabMode="fixed" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/main_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainPagerActivity"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
/>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:src="#android:drawable/ic_menu_edit" />
</android.support.design.widget.CoordinatorLayout>
and the fragment layout :
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:wheel="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.m360learning.app.fragment.MainPagerNewsFeed">
<com.pnikosis.materialishprogress.ProgressWheel
android:id="#+id/progress_wheel"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_gravity="center"
wheel:matProg_barColor="#5588FF"
wheel:matProg_progressIndeterminate="true" />
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
</android.support.v4.widget.SwipeRefreshLayout>
</FrameLayout>

If you don't want parallax effect, you don't need to use CollapsingToolbarLayout.
Most important configuration:
In Toolbar, set app:layout_scrollFlags="scroll|enterAlways".
In ViewPager, set app:layout_behavior="#string/appbar_scrolling_view_behavior".
And layout should look like this:
<android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.AppBarLayout>
<android.support.v7.widget.Toolbar/>
<android.support.design.widget.TabLayout/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager/>
<android.support.design.widget.FloatingActionButton/>
</android.support.design.widget.CoordinatorLayout>
Move ProgressWheel out of your SwipeRefreshLayout to fix your problem that SwipeRefreshLayout can't refresh.

Collapsing toolbar with image, tabs and FAB

I'm having difficulties trying to implement the toolbar as in images below:
However, I've failed to add the Floating Action Button like shown on image. I'm using Googles design support library. Any ideas?
My current XML code:
<?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:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="250dp"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7">
<ImageView
android:id="#+id/imgBackdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop" />
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#20000000" />
</FrameLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
style="#style/Widget.PinList.ActionBar.Transparent"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin" />
</android.support.design.widget.CollapsingToolbarLayout>
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|enterAlways">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
style="#style/PinListTabLayout"
android:layout_width="match_parent"
android:layout_height="60dp"
app:layout_collapseMode="pin" />
</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"
android:background="#color/background"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>

I've found a solution. I thought that app:layout_anchorGravity could only reference elements like RelativeLayout's positioning attributes. But obviously, I was wrong. I've only added this code above the ViewPager in previous xml:
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:layout_marginRight="10dp"
android:src="#drawable/ic_action_add"
app:layout_anchor="#id/collapsing_toolbar"
app:layout_anchorGravity="bottom|right|end" />

See my solution here.
It works on API 14-23.
Hope to help you