Develop Reference

Last item of RecyclerView gets hidden when using AppBarLayout

 At the second picture, items are scrolled till the bottom of the screen, part of the item is hidden behind BottomNavigationView.
activity_main.xml:
<?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:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical">
<FrameLayout
android:id="#+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/navigation">
</FrameLayout>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/windowBackground"
android:layout_alignParentBottom="true"
app:menu="#menu/navigation"
/>
</RelativeLayout>
activity_dynamic_recycler.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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="110dp"
android:id="#+id/appbar"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/collapsing_toolbar"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:contentScrim="?attr/colorPrimary"
app:title="#string/title_places"
app:expandedTitleMarginStart="72dp"
app:expandedTitleTextAppearance="#style/ExpandedAppbar"
app:collapsedTitleTextAppearance="#style/CollapsedAppbar">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/header_text_layout"
android:background="?attr/colorPrimary"
android:layout_gravity="bottom"
android:gravity="center_vertical"
android:paddingLeft="72dp"
android:paddingRight="10dp"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/subtitle"
android:textColor="#android:color/darker_gray"
android:textSize="16sp"
android:text="#string/my_location"/>
</LinearLayout>
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:id="#+id/fragment_places_toolbar"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"/>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:id="#+id/recyclerView">
</android.support.v7.widget.RecyclerView>
</android.support.design.widget.CoordinatorLayout>
Here are the images:
Tried adding margin/padding to recyclerview - did not help. Did not find cases of AppbarLayout and NavigationView with similar problem. Any help would be appreciated.

You can try doing this by separating things down.
activity_main.xml
<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:layout_width="match_parent"
android:layout_height="wrap_content"
app:theme="#style/ThemeOverlay.AppCompat.Dark">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
app:contentInsetStart="#dimen/fab_margin"/>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="?android:attr/windowBackground"
app:menu="#menu/navigation" />
</android.support.design.widget.CoordinatorLayout>
activity_dynamic_recycler.xml
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="?attr/actionBarSize"
xmlns:tool="http://schemas.android.com/tools"
android:orientation="vertical"
tool:context=".MainActivity">
<android.support.v7.widget.RecyclerView
android:id="#+id/theory_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbarStyle="outsideOverlay"
android:divider="#color/list_divider"
android:dividerHeight="1dp"
android:listSelector="#drawable/list_row_selector"
android:paddingBottom="48dp"
android:clipToPadding="false" />
</FrameLayout>

Set RecyclerView layout_marginBottom="110dp" because your AppBarLayout layout_height="110dp".
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:id="#+id/recyclerView"
android:layout_marginBottom="110dp">
</android.support.v7.widget.RecyclerView>

According to Google Design Spec bottom navigation bar should hide on scrolling
Implementation : https://www.stackoverflow.com/a/44778453

Recycler view not scrolling

I've got a view of a fragment when I use tab layout inside and recycler view, the problem is that recycler view doesn't scroll at all, any ideas why?
<FrameLayout 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"
app:elevation="0dp"
tools:context="com.carmen.carmen.fragment.dashboard">
<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.support.design.widget.TabLayout
android:id="#+id/tab_layout"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_below="#+id/toolbar"
android:background="#FFFFFF"
android:layout_gravity="center_horizontal"
app:tabSelectedTextColor="#000000"
app:tabTextColor="#000000"
app:elevation="0dp"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<android.support.v7.widget.RecyclerView
android:id="#+id/serviceView"
android:layout_width="match_parent"
app:layout_anchor="#+id/tab_layout"
app:layout_anchorGravity="bottom"
android:layout_gravity="bottom"
android:layout_height="wrap_content"
android:scrollbars="vertical"
/>
<include layout="#layout/active_service_sheet" />
</android.support.design.widget.CoordinatorLayout>
</FrameLayout>
when I add padding to the recycler view it works, but it took a space from the tab layout

Add this attr to your CoordinatorLayout
app:layout_behavior="#string/appbar_scrolling_view_behavior"
or do something like this :
<FrameLayout 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"
app:elevation="0dp"
tools:context="com.carmen.carmen.fragment.dashboard">
<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.support.design.widget.TabLayout
android:id="#+id/tab_layout"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_below="#+id/toolbar"
android:background="#FFFFFF"
android:layout_gravity="center_horizontal"
app:tabSelectedTextColor="#000000"
app:tabTextColor="#000000"
app:elevation="0dp"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<LinearLayout 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:orientation="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical" />
</LinearLayout>
<include layout="#layout/active_service_sheet" />
</android.support.design.widget.CoordinatorLayout>
</FrameLayout>

Can you try to paste RecyclerView inside NestedScrollView
<android.support.v4.widget.NestedScrollView
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:layout_gravity="fill_vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="#+id/serviceView"
android:layout_width="match_parent"
app:layout_anchor="#+id/tab_layout"
app:layout_anchorGravity="bottom"
android:layout_gravity="bottom"
android:layout_height="wrap_content"
android:scrollbars="vertical"
/>
</android.support.v4.widget.NestedScrollView>

In view that must scroll inside CoordinatorLayout you must write this parameter:
app:layout_behavior=""#string/appbar_scrolling_view_behavior""

Add below line to your coordinatorlayout
app:layout_behavior="#string/appbar_scrolling_view_behavior"
Or you create same thing like below.
main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
android:id="#+id/main_layout"
android:orientation="vertical"
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.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<!-- our 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="match_parent"
android:layout_height="60sp"
android:background="#color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:popupTheme="#style/ThemeOverlay.AppCompat.Light"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_scrollFlags="scroll|enterAlways">
<TextView
android:id="#+id/side_toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textSize="20sp"
android:textStyle="bold" />
</android.support.v7.widget.Toolbar>
<!-- our tablayout to display tabs -->
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
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"/>
</android.support.design.widget.AppBarLayout>
<!-- View pager to swipe views -->
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
And Create Recyclerview in fragments layout like below code
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
android:id="#+id/main_layout"
android:orientation="vertical"
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.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<!-- our 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="match_parent"
android:layout_height="60sp"
android:background="#color/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:popupTheme="#style/ThemeOverlay.AppCompat.Light"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_scrollFlags="scroll|enterAlways">
<TextView
android:id="#+id/side_toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textSize="20sp"
android:textStyle="bold" />
</android.support.v7.widget.Toolbar>
<!-- our tablayout to display tabs -->
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
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"/>
</android.support.design.widget.AppBarLayout>
<!-- View pager to swipe views -->
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
And create a layout to attach it with recyclerview. Like below code
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="220dp"
android:layout_height="150dp"
android:layout_margin="5dp">
<ImageView
android:id="#+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/img4"
android:scaleType="fitXY"
android:text="Category"
android:gravity="center"
tools:ignore="DuplicateIds" />
<TextView
android:id="#+id/id"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#drawable/transparent_strip"
android:text="Today's Deals"
android:paddingTop="12dp"
android:paddingBottom="12dp"
android:textSize="18dp"
android:textColor="#FFFFFF"
android:gravity="center"
android:layout_centerInParent="true"/>
</RelativeLayout>

Empty space below coordinator layout

I'm working on a view that need to be scrolled using coordinator layout and inside it should have recyclerview.
i've tried several answer, but it didn't work at all.
There's still empty space below the recycler view section.
Here's my activity.xml
<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"
tools:context="com.woi.adeisme.MainActivity"
android:background="#ff0000"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
app:layout_scrollFlags="scroll"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:text="Masa?"
android:paddingTop="60dp"
android:paddingBottom="60dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:background="#0000ff"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="0dp"
android:layout_margin = "0dp">
</android.support.v7.widget.RecyclerView>
</android.support.design.widget.CoordinatorLayout>
i've tried :
1. set layout_height = match_parent / wrap content
2. fitsSystemWindow
3. fillPort
and this still not working..
can anybody help me ?

try Linear layout instead of CoordinatorLayout like below this may help
<LinearLayout
android:orientation="vertical"
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:background="#ff0000"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
app:layout_scrollFlags="scroll"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:text="Masa?"
android:paddingTop="60dp"
android:paddingBottom="60dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:background="#0000ff"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="0dp"
android:layout_margin = "0dp"/>
<!-- <include layout="#layout/useless_content"/>-->
</LinearLayout>

ScrollView not scrolling bottom completely

Before you mark it duplicate, let me tell you that I have searched for every answer but all in vain.
I am using Tabs with Actionbar.
I have set android:layout_height="match_parent" of ScrollView as suggested in many solutions.
I also have removed android:layout_gravity="center" from all layouts as suggested by:
Android scrollview hiding top content in layout
I also have set android:fillViewport="true" but no luck.
Any other hack that I am missing?
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<LinearLayout
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content">
<CalendarView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/calendarView" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Guest"/>
<NumberPicker
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</NumberPicker>
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/title_time_slot"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/title_add_on"/>
<Button
android:id="#+id/btn_confirm"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/title_btn_confirm"/>
</LinearLayout>
</ScrollView>
Here is xml of activity:
<?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:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.squincy.wspace.ui.HomeActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<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_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabTextColor="#color/app_color_black"
app:tabTextAppearance="#android:style/TextAppearance.Widget.TabWidget"
app:tabIndicatorColor="#color/app_color_black"
app:tabGravity="center"
app:tabMode="scrollable"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
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.FloatingActionButton-->
<!--android:id="#+id/fab"-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:layout_gravity="end|bottom"-->
<!--android:layout_margin="#dimen/fab_margin"-->
<!--android:src="#android:drawable/ic_dialog_email" />-->
</android.support.design.widget.CoordinatorLayout>

I think you should try NestedScrollView
<android.support.v4.widget.NestedScrollView
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"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
Just replace your ScrollView with this one
I am using it in my app and it works perfectly

Try adding paddingBottom to your LinearLayout inside ScrollView.
If that doesn't work then try adding Space as last child of LinearLayout inside ScrollView like this:
<ScrollView
<LinearLayout
// other views
<Space
android:layout_width="match_parent"
android:layout_height="required_spacing_in_dp" />
</LinearLayout>
</ScrollView

if RecyclerView cant cover a full screen, the CoordinatorLayout will not work?

<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/fragment.background">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/fragment.background"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/fragment.background"
android:orientation="vertical"
app:layout_scrollFlags="scroll|enterAlways">
<TextView
style="#style/merchantHintText"
android:id="#+id/contract_template_title"
android:layout_width="match_parent"
android:background="#color/white"
android:padding="15dp"/>
<ImageView
android:layout_width="match_parent"
android:layout_height="1dp"
android:src="#color/fragment.background" />
<com.tqmall.salestool.merchant.task.UploadImgLayout
android:id="#+id/contract_template_imglayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:background="#color/white"
android:orientation="vertical"
android:padding="15dp" />
<TextView
android:id="#+id/contract_template_info"
style="#style/merchantHintText"
android:layout_width="match_parent"
android:background="#color/white"
android:padding="15dp"/>
<ImageView
android:layout_width="match_parent"
android:layout_height="1dp"
android:src="#color/fragment.background" />
</LinearLayout>
</android.support.design.widget.AppBarLayout>
<com.tqmall.salestool.view.ListRecyclerView
android:id="#+id/contract_template_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:paddingBottom="40dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
<TextView
android:id="#+id/contract_template_sure_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#color/text.red"
android:gravity="center"
android:padding="10dp"
android:textColor="#color/white"
android:textSize="20sp" />
</RelativeLayout>
When my adapter have enough number of data (which inflating a much higher view than screen), the LinearLayout in AppBarLayout will collapse correctly. However, if there are few data, it will not collapse. I read the source code of AppBarLayout, but not find the code cause that.
Why it acts like that?

Just put you Linear layout into CollapsingToolbarLayout like this
<?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/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
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:layout_scrollFlags="scroll|exitUntilCollapsed">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<!-- views -->
</LinearLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/scrollableView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
Try this. It should work.