Develop Reference

How to make CollapsingToolbarLayout disappear completely after scrolling?

I'm trying to make a fragment "head" with two toolbars and horizontal scroll view between them. I want to make horizontal scroll view completely disappear after scrolling down but after scrolling there some black space and i don't know why. What attributes should i type to make it?
Here is my layout:
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_height="match_parent"
android:layout_width="match_parent">
<androidx.appcompat.widget.Toolbar
android:id="#+id/tool"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
app:layout_constraintTop_toTopOf="parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:foregroundGravity="center"
android:src="#drawable/ic_arrow" />
</androidx.appcompat.widget.Toolbar>
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:clipToPadding="false"
android:fitsSystemWindows="true"
app:layout_constraintTop_toBottomOf="#id/tool"
tools:context=".ui.menu.MenuFragment">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="220dp"
android:fitsSystemWindows="true"
android:theme="#style/Theme.PizzaTime.AppBarOverlay">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_collapseMode="parallax"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
</LinearLayout>
</HorizontalScrollView>
<androidx.appcompat.widget.Toolbar
android:id="#+id/support_action"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
app:layout_collapseMode="pin"
app:popupTheme="#style/Theme.PizzaTime.PopupOverlay">
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:foregroundGravity="center"
android:src="#drawable/ic_arrow" />
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<include layout="#layout/scroll_content" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

After I deleted the following line from CoordinatorLayout:
android:fitsSystemWindows="true"
It started working correctly, hope it will be helpful for someone.

Toolbar don't hide on scroll

I do everything according to the instructions, but the toolbar remains stationary while scrolling through recyclerview in a fragment.
Recyclerview I have is in the fragment itself
Activity:
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar_home"
android:layout_width="match_parent"
android:background="#color/yellow"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|enterAlways">
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:id="#+id/frag_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom|center_vertical"
android:layout_marginBottom="60dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Fragment:
<androidx.coordinatorlayout.widget.CoordinatorLayout 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"
tools:context=".note.notes.NotesFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/notes"
android:paddingTop="72dp"
android:paddingStart="4dp"
android:paddingEnd="4dp"
android:clipToPadding="false"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
I will be very grateful for your help!

Make some changes to your XML :
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:toolbarId="#+id/toolbar_home" >
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar_home"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
Hope it works for you!

Hiding AppBarLayout on RecyclerView Scroll using MaterialDesignComponents

I'm trying to collapse the AppBarLayout when I scroll up the RecyclerView. I'm trying this using Material Design Components.
So here's my code:
<?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"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar" app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent">
<com.google.android.material.appbar.MaterialToolbar
android:layout_height="?attr/actionBarSize"
android:layout_width="match_parent"
android:id="#+id/toolbar"
app:layout_scrollFlags="scroll|enterAlways|snap"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light">
<com.google.android.material.textview.MaterialTextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center"
android:textSize="18sp"
android:text="#string/app_name"/>
</com.google.android.material.appbar.MaterialToolbar>
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/component_recycler_view"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
<com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="24dp"
android:layout_gravity="bottom|end"
android:contentDescription="#string/extended_fab_content_desc"
android:text="#string/extended_fab_label"
app:icon="#drawable/ic_plus_24dp"
app:layout_anchor="#id/component_recycler_view"
app:layout_anchorGravity="bottom|right|end"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="24dp"
android:layout_marginBottom="24dp"
app:layout_constraintBottom_toBottomOf="#id/component_recycler_view"/>
</androidx.constraintlayout.widget.ConstraintLayout>
When I scroll up on the recyclerview, it does scroll up but the appbarlayout does not hide itself. Moreover the topmost item of the RecyclerView is partially hidden behind the AppBarLayout.

You can use CoordinatorLayout to achieve a CollapsingToolbarLayout, something like this:
<androidx.coordinatorlayout.widget.CoordinatorLayout
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:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#id/appbar"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="200dp"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleGravity="bottom"
app:expandedTitleMarginEnd="16dp"
app:expandedTitleMarginStart="16dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:title="#string/choose_hero">
<ImageView
android:id="#+id/toolbar_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:contentDescription="#null"
android:fitsSystemWindows="true"
android:scaleType="centerCrop" />
<androidx.appcompat.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" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
I am using this type of layout and my app bar is collapsing/expanding without hiding any recyclerView items.

collapsing toolbar layout won't collapse

I have a collapsing toolbar layout that has 2 issues with it:
1) it is static and does not collapse and I can't find the reason why
2) the last row in the recyclerview is being shown half way offscreen, I think it should be fixed one the collapsing is fixed?
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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Controllers.MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/AppBarLayout"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|snap|exitUntilCollapsed"
app:contentScrim="#color/colorPrimary"
app:title="Hero Title">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hero Title"
android:textStyle="bold"
android:textSize="20dp"
android:textColor="#ffffff"/>
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="150dp"
app:popupTheme="#style/ThemeOverlay.AppCompat.Dark">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/herosRecyclerView"
android:layout_width="395dp"
android:layout_height="715dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</android.support.design.widget.CoordinatorLayout>
and here is an image of what I mean by half offscreen:
https://imgur.com/Fz8TmKK

Please try this. It will work.
<?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:background="#color/colorWhite"
tools:context=".Controllers.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/AppBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="150dp"
android:textAlignment="center"
app:contentScrim="#color/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:title="Hero Title">
<ImageView
android:layout_width="match_parent"
android:layout_height="150dp"
android:background="#000000"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7" />
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Dark">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="#+id/herosRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
</android.support.design.widget.CoordinatorLayout>

Please add this to your ImageView:
app:layout_collapseMode="parallax"

The code will look like this :
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appbar"
android:fitsSystemWindows="true"
android:layout_height="192dp"
android:layout_width="match_parent">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:toolbarId="#+id/toolbar"
app:title="#string/app_name"
app:layout_scrollFlags="snap|scroll|exitUntilCollapsed"
app:layout_scrollInterpolator="#android:anim/decelerate_interpolator"
app:contentScrim="?attr/colorPrimary">
<ImageView
android:id="#+id/app_bar_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/ss"
android:scaleType="centerCrop" />
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_height="?attr/actionBarSize"
app:collapseIcon="#drawable/ic_baseline_menu_24"
app:navigationIcon="#drawable/ic_baseline_menu_24"
android:layout_width="match_parent"
app:layout_collapseMode="pin"
app:menu="#menu/demo_menu">
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="12dp"
android:text="#string/ipsum">
</TextView>
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
for full tutorial visit:
https://bedevelopers.tech/collapsing-toolbar-android-example-using-android-studio/

Display a loading view in the center of a recyclerview

I have a layout that uses a coordinator layout as the root that has a collapsible toolbar and a header view. Underneath I have a recyclerview where I display a list of items.
I have having a problem displaying the loadingView in the center of the recyclerview. I have been trying to use the constraint layout without success. So if the header is collapsed or expanded it should alway display in the center of the recyclerview and not the actual screen.
Here is my layout:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/search_result_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:id="#+id/appBarLayout"
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/collapsingToolbarLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:collapsedTitleGravity="left"
app:contentScrim="#color/toolbar_color"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<include
android:id="#+id/header"
layout="#layout/list_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.3" />
<cToolbar
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>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="#+id/contentView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<CustomOverlayLoadingView
android:id="#+id/loadingView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="#id/contentView"
app:layout_constraintTop_toTopOf="#id/contentView"
android:visibility="gone"
tools:visibility="visible" />
</android.support.constraint.ConstraintLayout>
</android.support.design.widget.CoordinatorLayout>
Update:
This is the image I get when I update with your answer. As you can see the image displays directly under the header. However, I would like it to be displayed in the center of the recyclerview.

Try this one...:)
<?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/search_result_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:id="#+id/appBarLayout"
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/collapsingToolbarLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:collapsedTitleGravity="left"
app:contentScrim="#color/toolbar_color"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<include
android:id="#+id/header"
layout="#layout/list_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.3" />
<cToolbar
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>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_below="#+id/appBarLayout">
<android.support.v7.widget.RecyclerView
android:id="#+id/contentView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<CustomOverlayLoadingView
android:id="#+id/loadingView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:visibility="gone"
tools:visibility="visible" />
</RelativeLayout>
</RelativeLayout>

Setting the proper constraints for the RecyclerView should help here. This is how the ConstraintLayout for the main content should look like:
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/contentView"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<CustomOverlayLoadingView
android:id="#+id/loadingView"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="#id/contentView"
app:layout_constraintEnd_toEndOf="#id/contentView"
app:layout_constraintStart_toStartOf="#id/contentView"
app:layout_constraintTop_toTopOf="#id/contentView"
android:visibility="gone"
tools:visibility="visible" />
</android.support.constraint.ConstraintLayout>