Develop Reference

Scrollable view inside CollapsingToolbarLayout

I want to achieve scrolling image inside toolbar, that can be collapsed, when I drag toolbar (outside image).
With default AppBarLayout.Behavior I can't scroll content inside.
I've tried to use
app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
for AppBarLayout, it allows scrolling, but toolbar doesn't collapse.
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:id="#+id/root"
style="?attr/bottomSheetStyle"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="android.support.design.widget.BottomSheetBehavior">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
tools:visibility="visible">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsingToolbarLayout"
android:nestedScrollingEnabled="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|enterAlwaysCollapsed">
<androidx.core.widget.NestedScrollView
android:id="#+id/imageScroller"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipChildren="false"
android:clipToPadding="false"
android:scrollbars="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="#dimen/half_margin">
<androidx.appcompat.widget.AppCompatImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="#dimen/half_margin"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"
tools:src="#drawable/emoji" />
</LinearLayout>
</androidx.core.widget.NestedScrollView>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/contentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior=".CenterCollapsingScrollBehavior" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
How to make it work properly?

Place a View at the center of the ScrollView's area using CoordinatorLayout

Suppose I have the following layout .xml file:
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/pen_apl_app_bar"
android:layout_width="match_parent"
android:layout_height="260dp"
android:background="#00FF00"
app:elevation="0dp" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/pen_rv_insurers"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0000FF"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
It should result in a preview like this
My question is, how can I place the ProgressBar at the center of the RecyclerView area when using a CoordinatorLayout? The ProgressBar should always be at the center of the RecyclerView.

I see appbarlayout has hight 260dp so you can add RelativeLayout with top margin 260dp and move RecyclerView and ProgressBar inside it like this
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/pen_apl_app_bar"
android:layout_width="match_parent"
android:layout_height="260dp"
android:background="#00FF00"
app:elevation="0dp" />
<RelativeLayout
android:id="#+id/relativeLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="260dp">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/pen_rv_insurers"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0000FF"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
</androidx.recyclerview.widget.RecyclerView>
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_centerHorizontal="true"
android:layout_gravity="center" />
</RelativeLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Edit** This Shuold work if hight dynamic of appbar
<?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">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/pen_apl_app_bar"
android:layout_width="match_parent"
android:layout_height="260dp"
android:background="#00FF00"
app:elevation="0dp" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/pen_apl_app_bar">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/pen_rv_insurers"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0000FF"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
</androidx.recyclerview.widget.RecyclerView>
<ProgressBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_gravity="center" />
</RelativeLayout>
</RelativeLayout>

LinearLayout and NestedScrollView problem

How I want to use NestedScrollView, the view for the toolbar at the top and the bottom View view at the bottom. The top and bottom view Toolbar and bottom view must always be in place.
How do I achieve this result for any device? I appreciate any answer, thank you.
Always like that:
It is my code:
<?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"
android:orientation="vertical">
<!--This is top-->
<androidx.appcompat.widget.LinearLayoutCompat
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:background="#color/colorPrimary">
<!--.........................-->
</androidx.appcompat.widget.LinearLayoutCompat>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#color/colorGreyFragment">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
</androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
</androidx.core.widget.NestedScrollView>
<!--This is bottom-->
<androidx.appcompat.widget.LinearLayoutCompat
android:id="#+id/bottom_buttons_group"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center"
android:background="#color/colorWhite">
<!--..............................-->
</androidx.appcompat.widget.LinearLayoutCompat>
</LinearLayout>

You can do it this way,
<?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"
android:orientation="vertical">
<!--This is top-->
<androidx.appcompat.widget.LinearLayoutCompat
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:background="#color/colorPrimary">
<!--.........................-->
</androidx.appcompat.widget.LinearLayoutCompat>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorGreyFragment"
android:orientation="vertical">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"></androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
</androidx.core.widget.NestedScrollView>
<!--This is bottom-->
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
I have replaced your linear layout at the bottom with the BottomNavigationView, if you want some other thing you can replace there.

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>

How do I fix a layout inside Coordinator Layout?

Currently recycler view and the app bar scrolls . Now I need to fix the relative layout rlProductCheckout to the bottom of the screen even if the recyclerview and app bar scrolls. Current relative layout disappears when I start scrolling, it reappears only when I move back to the start of the list.
content_products_layout.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:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:showIn="#layout/activity_products_list">
<android.support.v7.widget.RecyclerView
android:id="#+id/rvProductList"
android:layout_above="#+id/rlProductCheckout"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:gravity="center_vertical"
android:id="#+id/rlProductCheckout"
android:layout_alignParentBottom="true">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Checkout"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_menu_send"
android:layout_alignParentRight="true"/>
</RelativeLayout>
</RelativeLayout>
activity_products_layout.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/app_bar"
android:layout_width="match_parent"
android:layout_height="#dimen/app_bar_height"
android:fitsSystemWindows="true">
<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="#color/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:id="#+id/expandedImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#mipmap/prod1"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_products_list" />
</android.support.design.widget.CoordinatorLayout>

Try to wrap the RelativeLayout outside the CoordinatorLayout. Try some this like How to put RelativeLayout inside CoordinatorLayout