Develop Reference

Prevent FloatingActionButton from disappearing on a CollapsingToolbarLayout

I have a details fragment which shows information about a selected item. The image is embedded in a CoordinatorLayout and CollapsingToolbarLayout. The behavior works as expected: As the image is scrolled down, the FloatingActionButton scrolls up with the end of the CollapsingToolbarLayout. Then as it gets fully collapsed the FloatingActionButton disappears. What I want to happen is that this button never disappears. It's fine that it's anchored to the toolbar, but I have been unable to find out how to keep it visible after looking in the docs and on this site. Any tips would be appreciated!
Here is a simplified version of my layout:
<androidx.coordinatorlayout.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/app_bar"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:theme="#style/AppTheme.AppBarOverlay">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="#+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimaryDark"
app:contentScrim="#color/colorPrimaryDark"
app:expandedTitleMarginEnd="64dp"
app:expandedTitleMarginStart="48dp"
app:expandedTitleTextAppearance="#android:color/transparent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:title="#{movie.title}"
app:toolbarId="#+id/toolbar">
<ImageView
android:id="#+id/fragment_details_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="#string/browse_image_content_description"
android:scaleType="centerCrop"
app:largeSize="#{true}"
app:layout_collapseMode="parallax"
app:posterPath="#{movie.posterPath}" />
<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/AppTheme.PopupOverlay" />
</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="#string/appbar_scrolling_view_behavior"
tools:context="com.heiligbasil.movietvdelight.view.DetailsFragment">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/fragment_details_text_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="#{movie.title}"
android:textAlignment="center"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="parent" />
</RelativeLayout>
</androidx.core.widget.NestedScrollView>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:elevation="6dp"
app:borderWidth="0dp"
app:fabSize="mini"
app:layout_anchor="#id/app_bar"
app:layout_anchorGravity="bottom|end"
app:pressedTranslationZ="10dp"
app:rippleColor="#color/colorPrimary"
app:srcCompat="#drawable/ic_save" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>

What I want to happen is that this button never disappears
It's actually because of app:layout_anchor="#id/app_bar" where your FloatingActionButton has special relation and controls by AppBarLayout while scrolling.
To disable that, set: app:behavior_autoHide="false" to your FloatingActionButton.
Also, you can do this programmatically using setAutoHideEnabled(). This is exactly what you're looking for: https://stackoverflow.com/a/43077760/4409113

How to achieve transparent background for tab layout in collapsing toolbar ? and give a background or gradient effect to collapsing toolbar android?

My app contains a collapsing toolbar with a tablayout. The tabs have an own background color, my #color/colorPrimary. Now I would like to 'merge' the tablayout and collapsing toolbar and it should both be transparent, so the background image reaches from the toolbar down including the tabs. Like it is not divided by the background anymore.
Some what like this is needed:
And this is what my app now looks like:
My code is as follows:
<?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="#f3f3f3"
tools:context="example.jocelinthomas.dictionary.WordMeaningActivity">
<android.support.design.widget.AppBarLayout
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/collapsingtoolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:expandedTitleMarginBottom="60dp"
app:expandedTitleMarginEnd="5dp"
app:expandedTitleMarginStart="10dp"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleTextAppearance="#style/ExpandedTitleText"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:layout_width="match_parent"
android:layout_height="180dp"
app:layout_collapseMode="parallax"
app:layout_collapseParallaxMultiplier="0.7"
android:scaleType="centerCrop"/>
<ImageButton
android:id="#+id/btnSpeak"
android:layout_width="25dp"
android:layout_height="25dp"
android:layout_gravity="bottom|right"
android:layout_margin="15dp"
android:background="#drawable/speaker"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="#+id/mToolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
android:gravity="top"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.CollapsingToolbarLayout>
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
style="#style/TabStyle"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
android:background="#color/colorPrimary"
app:tabGravity="center"
app:tabMode="fixed"
app:tabSelectedTextColor="#color/colorAccent"
app:tabTextColor="#color/white">
</android.support.design.widget.TabLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
</android.support.v4.view.ViewPager>
<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="16dp"
android:src="#android:drawable/ic_menu_share" />
</android.support.design.widget.CoordinatorLayout>
I want a b/g image or gradient effect to my collapsing toolbar and the tab layout background should be transparent as shown in the first image, How should I achieve this?

IT IS TOO EASY
Use this line of code inside TabLayout
android:background="#android:color/transparent"

SmoothAppBarLayout collapsed toolbar height is bigger than intended

I recently changed my AppBarLayout with SmoothAppBarLayout
It is smoother and faster so i am happy with the result. But this changed my toolbar height somehow and i couldn't yet fix it.
Collapsed ToolBar's height should be 'actionBarSize' but it is bigger than that.
It is not about toolbar title, disabling or changing the padding of it doesnt work. But it is about the behaviour.
Setting a new behavior like below solves the problem but I want a proper solution.
AppBarLayout.Behavior behavior = new AppBarLayout.Behavior();
params.setBehavior(behavior);
First image shows the intended size, second shows the actual size.
Here is the part of my XML: (Didn't put all of it since it is pretty long)
<me.henrytao.smoothappbarlayout.SmoothAppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="210dp"
android:minHeight="50dp"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:sabl_target_id="#id/nestedScrollView">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsingToolbarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/transparent"
android:fitsSystemWindows="true"
android:minHeight="210dp"
app:contentScrim="#color/dark_gray_actionbar"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="210dp"
android:orientation="vertical"
app:layout_collapseMode="parallax">
<ImageView
android:id="#+id/serviceImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="Servis Fotoğrafı"
android:scaleType="centerCrop"
android:src="#drawable/gray_color_gradient"
app:layout_collapseMode="parallax" />
</RelativeLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:layout_alignParentTop="true"
android:layout_gravity="center_horizontal"
app:layout_collapseMode="pin">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</me.henrytao.smoothappbarlayout.SmoothAppBarLayout>
<include
layout="#layout/get_quote_layout"
android:layout_width="match_parent"
android:layout_height="64dp"
app:layout_anchor="#id/nestedScrollView"
app:layout_anchorGravity="bottom"
app:layout_collapseMode="pin" />
</android.support.design.widget.CoordinatorLayout>

I think the issue comes from fitSystemWindows. You can simplify your layout as below:
...
<me.henrytao.smoothappbarlayout.SmoothAppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:sabl_target_id="#id/nestedScrollView">
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collapsingToolbarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/transparent"
app:contentScrim="#color/dark_gray_actionbar"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="210dp"
android:orientation="vertical"
app:layout_collapseMode="parallax">
<ImageView
android:id="#+id/serviceImage"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="Servis Fotoğrafı"
android:scaleType="centerCrop"
android:src="#drawable/gray_color_gradient"
app:layout_collapseMode="parallax" />
</RelativeLayout>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:layout_alignParentTop="true"
android:layout_gravity="center_horizontal"
app:layout_collapseMode="pin">
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</me.henrytao.smoothappbarlayout.SmoothAppBarLayout>
...

Google Cast v3 Mini Controller floats to top when used in CoordinatorLayout

I am updating my app to use the new Google Cast v3. Looking at the Code Lab, I have set to MiniController fragment in my layout, which is a CoordinatorLayout.
MiniController Fragment:
<fragment
android:id="#+id/castMiniController"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:visibility="gone"
class="com.google.android.gms.cast.framework.media.widget.MiniControllerFragment" />
Note that it is set to align to the parent bottom, however, it is up at the top of the window. See the attached screenshot.
Layout 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:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="#dimen/detail_backdrop_height"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:expandedTitleGravity="top"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp"
app:titleEnabled="false">
<ImageView
android:id="#+id/backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax"
android:contentDescription="#string/backdrop_content_description" />
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|exitUntilCollapsed" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<fragment
android:id="#+id/castMiniController"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:visibility="gone"
class="com.google.android.gms.cast.framework.media.widget.MiniControllerFragment" />
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="#dimen/outer_margin"
android:layout_marginStart="#dimen/outer_margin"
android:layout_marginRight="#dimen/outer_margin"
android:layout_marginEnd="#dimen/outer_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<FrameLayout
android:id="#+id/fl_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.v4.widget.NestedScrollView>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
app:layout_anchor="#id/appbar"
app:layout_anchorGravity="bottom|right|end"
style="#style/FabStyle"/>
</android.support.design.widget.CoordinatorLayout>

In coordinator layout, you can not use layout_alignParentBottom.
android:layout_alignParentBottom="true"
You should change :
android:layout_alignParentBottom="true"
with
android:layout_gravity="end|bottom"

It looks like if you wrap the coordinator layout in a relative layout, then include the minicontroller after the coordinator layout, then it will be positioned appropriately at the bottom of the screen.

If you are using Relative Layout or similar ones, use
android:layout_gravity="bottom"

Collapsible Toolbar with Custom View that Moves as Scrolling Happens and Gets Pinned (like in Phonograph)

I would like to achieve something similar to the following in my app, but I want the whole red area (where it says "Guardians Of The Gala..." in the screenshots below) to be a custom view. (Some elements would fade out as the toolbar is collapsed.)
``
`
I've been trying for hours and hours to get it to work, but to no avail.
Obviously, just putting it into <Toolbar> doesn't work, since it doesn't know that it's supposed to animate it:
<android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.AppBarLayout>
<android.support.design.widget.CollapsingToolbarLayout>
<ImageView/>
<android.support.v7.widget.Toolbar>
<include layout="#layout/link_view_title_bar"/>
I've tried doing most of the answers from here and here but nothing actually worked.
How could I do this, preferably using mostly XML and the Android Design Support library. Any help would be appreaciated.

<android.support.design.widget.CoordinatorLayout
android:id="#+id/homeCoordinator"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="#+id/homeAppBarLayout"
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/homeCollapseToolbar"
android:layout_width="match_parent"
android:layout_height="350dp"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
//This can be changed to ImageView
<com.daimajia.slider.library.SliderLayout
android:id="#+id/homeSliderLayout"
app:layout_collapseMode="parallax"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="350dp"/>
<android.support.v7.widget.Toolbar
android:id="#+id/homeToolbar"
android:title=""
android:layout_width="match_parent"
android:layout_height="115dp"
android:gravity="top"
android:minHeight="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:titleMarginTop="15dp" >
<ImageView
android:src="#drawable/ic_logo"
android:paddingLeft="10dp"
android:layout_gravity="center|top"
android:layout_width="wrap_content"
android:layout_height="35dp" />
</android.support.v7.widget.Toolbar>
//Instead of the TabLayout, put your Red Layout
<android.support.design.widget.TabLayout
android:id="#+id/homeTabLayout"
android:layout_marginBottom="15dp"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
app:tabGravity="center"
app:tabIndicatorColor="#color/colorAccent" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/homeViewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>