Toolbar Animation with Android Design Support Library
In this Android tutorial we’ll create an on scroll, collapsing Toolbar
animation.
The Design support library for Android makes it easy to create great animations. Let’s look at how to create an app with a collapsing Toolbar
animation. It’s know as the Flexible Space with Image pattern, a popular scrolling technique.
I didn’t know this pattern actually had a name until Ian Lake happened to point it out for me.
This article has been updated for AndroidX!
Flexible Space with Image Pattern
A scrolling technique that supports an image header with a scrollable view below it. Upon scrolling, the ‘Flexible Space’ (image header) gets tinted with or. At the same time, it collapses into a Toolbar.
– Material Design guidelines
This pattern is a popular scrolling technique. In familiar terms, you can see this in WhatsApp’s contact detail screen.
Here’s the step-by-step screenshots of the Flexible Space animation. Should give you a clear picture of what’s going on.
Notice the Toolbar
dynamically changes color, depending on the image. It takes on the most dominant color present in the image.
We can do this with the Palette API, but more on that later.
You might immediately start to freak out with the amount of code it might take. But rest assured, there’s no scary Java code to write. Most of it is XML, so cheers to that!
Other Design Support Library tutorials:
- Material Design Navigation Drawer
- Parallax Scrolling Tabs with header image
- Material Design Tabs Layout
- Quick Return pattern
Here’s a useful index for navigating the article. Sections include not just how to implement the pattern. But also how to do it correctly, in terms of UI and UX.
Table of Contents
- Getting Started
- Floating Action Button
- Dynamic Colors with Palette API
- Complete Activity Code
- Toolbar Animation in Action
Getting Started
Start by adding the Design Support Library to your app/build.gradle file.
NOTE
The Design Support package is now part of Android X.
dependencies { … implementation 'androidx.appcompat:appcompat:1.1.0' implementation 'com.google.android.material:material:1.0.0' }
Layout Structure
As always, we’ll get started with the XML first. Open your activity.xml layout.
Here’s the layout skeleton.
<androidx.coordinatorlayout.widget.CoordinatorLayout>
<com.google.android.material.appbar.AppBarLayout>
<com.google.android.material.appbar.CollapsingToolbarLayout>
<ImageView />
<androidx.appcompat.widget.Toolbar />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<!-- Your scrollable content here -->
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Design Support UI Widgets
I understand if all these layouts might appear new to you. But you won’t have to worry. I’ll do my best to explain them in the easiest way.
1. CoordinatorLayout
A powerful FrameLayout
that specifies behavior for child views for various interactions. It also allows anchoring of floating views in your layout.
2. AppBarLayout
It is a special kind of vertical LinearLayout
. It helps respond to its children’s scroll events (scroll gestures). Additionally, it’s responsible for implementing many features of Material Design’s AppBarLayout
.
But, there’s one thing to note. Its usage relies on being a direct child within CoordinatorLayout
. The layout skeleton above demonstrates this.
3. CollapsingToolbarLayout
It is a Toolbar
wrapper which makes the ‘Flexible Space’ pattern possible. It collapses the image header while decreasing the expanded title to a Toolbar
title.
What’s left is the ImageView
which holds our actual header’s image and Toolbar
which we’re familiar with.
4. FloatingActionButton
I’m sure you’re familiar with what a Floating Action Button is, aren’t you? Android gave it a thumbs up by giving us an official UI widget. It’s a part of the Design Support Library.
Defining the XML Layout
Alright, with that out of the way lets get to the actual XML.
A word of caution. The layout below might look threatening in size!
<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="@dimen/appbar_header_height"
android:fitsSystemWindows="true"
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="match_parent"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="@dimen/activity_margin_content"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap">
<ImageView
android:id="@+id/header"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/header"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax" />
<View
android:layout_width="match_parent"
android:layout_height="80dp"
android:layout_gravity="top"
android:background="@drawable/scrim_topdown"
android:fitsSystemWindows="true" />
<View
android:layout_width="match_parent"
android:layout_height="160dp"
android:layout_gravity="bottom"
android:background="@drawable/scrim" />
<androidx.appcompat.widget.Toolbar
android:id="@+id/anim_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/scrollableview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipToPadding="false"
android:paddingTop="@dimen/activity_margin_content"
android:paddingBottom="@dimen/activity_margin_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:listItem="@layout/item_dessert" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/fab_margin"
android:clickable="true"
android:focusable="true"
android:src="@drawable/ic_action_add"
app:backgroundTint="#279AF1"
app:fabSize="normal"
app:layout_anchor="@+id/appbar"
app:layout_anchorGravity="bottom|right|end" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
This is not complex code. XML just tends to be a little verbose. But you’re welcome to try replicating the Flexible Space scroll animation in Java. Then I’m sure you’d truly appreciate how easy the Design Support library is!
However, I have highlighted the essential lines you need to focus on.
What you need to know from this?
- line 24:
layout_scrollFlags
Tells theCollapsingToolbarLayout
and its children, how to behave on a scroll.
Here’s what the flags mean, straight from the developer’s blog:
- scroll:
this flag should be set for all views that want to scroll off-screen. For views that do not use this flag, they’ll remain pinned to the top of the screen. - exitUntilCollapsed:
causes the view to scroll off until it is ‘collapsed’ before exiting - snap:
enables the expanded view to snap to either a collapsed state, or expanded state. There is no in-between state. If theView
has been dragged more towards expanding, it expands completely. If its dragged more towards collapsing, theView
collapses completely.
- scroll:
- line 33:
layout_collapseMode
Indicates how theImageView
reacts while collapsing on-scroll.
There are 2 collapse modes:
COLLAPSE_MODE_PARALLAX
(use forImageView
)COLLAPSE_MODE_PIN
(use forToolbar
)
- line 63:
layout_behavior
TheCoordinatorLayout
performs most of its magic usingBehavior
. Behaviors tell how its child Views must interact with each other.
- line 73:
layout_anchor
Remember we spoke about anchoring Views earlier? This attribute tellsFloatingActionButton
to anchor’ itself toAppBarLayout
. - line 74:
layout_anchorGravity
This attribute tells ourView
where to display, on its anchorView
.
Here’s what the Android Studio’s Preview pane shows us.
But wait. Does the expanded title look clear enough to you? I’m sure it’s not.
Whenever you display a label (TextView
) against a background image, use a ‘scrim‘. It will help make the text more readable.
TIP
Use a Scrim for clear, readable Text
A Scrim is a semi-transparent gradient layer that helps Text appear more readable against backgrounds.
Just below your ImageView
, add a simple View with a gradient Drawable
as background.
<View android:layout_width="match_parent" android:layout_height="160dp" android:layout_gravity="bottom" android:background="@drawable/scrim"/>
Here’s the Drawable
scrim.
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <gradient android:angle="90" android:endColor="@android:color/transparent" android:startColor="#66000000"/> </shape>
See the difference for yourself.
While the difference is subtle, the latter is much better right? Additionally, you can apply another scrim for the Toolbar. It can help the back and overflow icons be more visible. I leave this as an exercise for you.
There are many other techniques that you can use to display text over images.
Getting the Parallax Scroll right
I’ve already mentioned a hint above on parallax scroll. But there’s more to it. We can achieve parallax scrolling with ImageView
by setting its layout_collapseMode
to parallax
.
Parallax Scrolling involves the background moving at a slower rate to the foreground.
– Creativebloq.com
Did you notice an extra collapse mode attribute for the Toolbar
? Yes, you must use this as well. Why? Because, while the ImageView
should collapse, the Toolbar
must persist on scrolling.
Toolbar
must use collapseMode:pin
, because we want it to persist and remain on top, as the user scrolls down.
Note that I haven’t set any color for the Toolbar
. The CollapsingToolbarLayout
takes care of this. It dynamically picks up a color from our image and sets it to the Toolbar
.
Floating Action Button
Let’s look at the Floating Action Button for a bit. I’ll stick to calling it FAB from now on. If you tried to create a FAB earlier, you’d realize how hard it was. Yes, my previous posts on the FAB are now redundant. Sigh.
But with the Design Support Library, that’s not the case anymore. The layout above shows, how easy it is!
Notice that I haven’t explicitly defined a size for the FAB. By default, it takes its regular width and height of 56dp. But, you can define this by using the following attribute.
app:fabSize="regular"
Optionally, you can set the
fabSize
as mini
, which is a miniature version of the FAB at 40dp in size.
Next, in the layout, we position the FAB with alignment to the AppBarLayout
. We do this with the layout_anchor
attribute.
<com.google.android.material.floatingactionbutton.FloatingActionButton
...
app:layout_anchor="@+id/appbar"
app:layout_anchorGravity="bottom|right|end" />
That’s a wrap for the XML part. The good news is, this XML is all that’s required to trigger the Flexible Space scroll animation.
But wait! There’s still one thing that seems a bit off. What about the FAB’s action? After scrolling, the action goes hidden. It becomes available, only when you scroll, all the way to the top.
The Hidden Action
Once the AppBar collapses, we need to show the FAB’s action somewhere.
Now I’m not saying this is the recommended approach. But my suggestion is that once the FAB vanishes, we add the action to the Toolbar’s menu.
To do this we’ll need a listener first. We have to listen to the when the AppBarLayout
expands and collapses. To be precise, we need an OffsetChangedListener.
If the AppBarLayout
’s ‘verticalOffset’ is zero, then its fully expanded. So when the verticalOffset is almost equal to the fully expanded height, add the action to Toolbar
’s menu.
First, let’s look at how to set the listener. Here’s how to do it.
appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
@Override
public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
// Vertical offset == 0 indicates appBar is fully expanded.
if (Math.abs(verticalOffset) > 200) {
appBarExpanded = false;
invalidateOptionsMenu();
} else {
appBarExpanded = true;
invalidateOptionsMenu();
}
}
});
Here are some key takeaway points from the above code snippet.
verticalOffset
returns negative values, so we wrap it withMath.abs(verticalOffset)
appBarExpanded
is a boolean flag that I’m maintaining to know whenAppBarLayout
is expanded or collapsedinvalidateOptionsMenu()
is called every time ourAppBarLayout
’s height crosses a threshold (200)
Now I wish there was a simpler way to know the AppBarLayout
’s state. But I guess this solution works good enough.
Updating Toolbar Menu
invalidateOptionsMenu()
helps update our Toolbar
Menu
. But we need to tell our Menu
when to add and remove our extra Action.
Note that the FAB’s action is an ‘Add’ function.
First, we need a reference for the existing Menu
. You can get this from the onCreateOptionsMenu()
method.
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
collapsedMenu = menu;
return true;
}
collapsedMenu
is a global variable of type Menu
. It allows us to keep a copy of the original Menu
.
Next, we need to update our Menu
. We’re already calling invalidateOptionsMenu()
in the scroll listener. This will trigger the onPrepareOptionsMenu()
method. Hence, we’ll add our dynamic Menu
logic here.
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
if (collapsedMenu != null &&
(!appBarExpanded || collapsedMenu.size() != 1)) {
//collapsed
collapsedMenu.add("Add")
.setIcon(R.drawable.ic_action_add)
.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
} else {
//expanded
}
return super.onPrepareOptionsMenu(collapsedMenu);
}
You’ll notice that I haven’t done anything for the expanded state. We don’t need to either. I’ll tell you why.
After onPrepareOptionsMenu()
, the onCreateOptionsMenu()
is called. What do we need to do in the expanded state? The FAB becomes visible, which means we should hide the ‘Add’ action from Toolbar
menu.
Since onCreateOptionsMenu()
inflates the original Menu
again, we don’t have to worry about manually removing it.
So now, when the FAB hides, its Action will be added to Toolbar
Menu
. When the AppBarLayout
collapses and FAB hides, the ‘Add’ action becomes visible in the Toolbar
Menu
.
Now all that remains is to do the usual UI initialization in Java. So let’s setup our Toolbar and then call in the Palette API.
Dynamic Colors with Palette API
The palette API is a support library that extracts prominent colors from images.
To use the Palette library, we first need to add it to your project. So open up your app/build.gradle and add the following line.
dependencies { … implementation 'androidx.palette:palette:1.0.0' }
Remember that we have to initialize our UI first. So open your Activity.java and type away. Or copy-paste this instead.
toolbar = (Toolbar) findViewById(R.id.anim_toolbar); setSupportActionBar(toolbar); collapsingToolbar = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar); collapsingToolbar.setTitle("Suleiman Ali Shakir"); ImageView header = (ImageView) findViewById(R.id.header);
Now you might ask me, why I have set a title for CollapsingToolbarLayout
, instead of Toolbar
? That’s a valid question.
Take a look at the Flexible Space with Image scroll animation. Yes, the GIF which I shared at the beginning of this post. Notice there’s an expanded title, which on scrolling, collapses into the Toolbar
title.
The CollapsingToolbarLayout
handles this for us. Hence we set the title for that, instead of a Toolbar
.
Additionally, the CollapsingToolbarLayout
also handles tinting our Toolbar
using the Palette API. I’ll show you how to do this.
Using the Palette API
First, pass the ‘header’ ImageView
’s bitmap to the Palette API. Then the API will generate colors based on the header image, in an AsyncTask.
Once it completes, we can fetch a color we want and set it to CollapsingToolbarLayout
. This, in turn, tints our Toolbar
to our chosen color, when we scroll.
Let’s look at some code.
Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() {
@Override
public void onGenerated(Palette palette) {
int vibrantColor = palette.getVibrantColor(R.color.primary_500);
collapsingToolbar.setContentScrimColor(vibrantColor);
collapsingToolbar.setStatusBarScrimColor(R.color.black_trans80);
}
});
I am fetching my bitmap from my resources directory. But, in a real-world scenario, you would be downloading the image from an URL. Then saving it as a bitmap and passing that to the Palette API.
The Palette API offers several color options (variations). Here are the basic four:
- Light
- Dark
- Vibrant
- Muted
You can also increase the number of colors generated from the image. Or you can even retrieve the entire color swatch! If you’re interested in playing around with the Palette API, I’d suggest you go through Chris Banes’ post.
Complete Activity Code
Here’s the complete Activity
for your reference.
Output – Toolbar Animation Results
Finally, we’ve completed what’s needed for the Toolbar
animation. In fact, much more than what’s required! So go ahead, run your app and watch the magic.
To be honest, it was surprising to see such a smooth Toolbar
animation. Even the FAB beautifully reacts upon touch with a higher elevation.
Source Code:
Available on GitHub
Material Design is a powerful visual language that can help you design a brilliant app. The Design Support Library makes it easy to create powerful animations, like this. It allows us to create rich app experiences our users can enjoy.
How are you using the Design Support Library? Do you have your own take on the ‘Flexible Space with Image’ animation pattern? Let me know in the comments below.
Also, if you liked reading this, don’t forget to share with your friends.
Product Designer who occasionally writes code.
First off, really thanks for the tutorial, it actually works & helps alot.
Second, I tried to make some minor changes (add navigation view and allow scrolling up), but didn’t manage to do that. Could you please take a look here? http://stackoverflow.com/questions/31389582/flexible-space-with-image-in-android
Glad you found the tutorial useful!
About your issue, try loading your entire layout from a fragment. (Apart from the navigation drawer layout).
Trying to make the Status Bar work in conjunction with a Collapsing header AND Navigation Drawer is indeed messy.
For scrolling, there is a neat method you could try: scrollToPosition() https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html#scrollToPosition(int)
Pass your adapter’s item position. So while your activity loads, it does so scrolled down a little and your image has lesser height. User can scroll up to reveal more, or scroll down to hide.
Hope that helps you.
1. How do I do that?
My entire app contains a single Drawer Activity with a navigation view & toolbar.
In the middle of the screen I have a Frame Layout which I keep switching for each fragment chosen from the nav view, as usual.
The problem is, I had to do this flexible space view in another activity since it has a very different view from the other main layout, such as a CollapsingBar Layout, an ImageView inside the AppBar Layout, and unique attributes to the layouts,
and also, the new fragment lacked basic methods I needed to use which only AppCompatActivity had, in order to deal with the layout switching, so I decided to simple make a new activity.
Can you please help me with that? I think you’re the only one got a chance.
2. scrollToPosition doesnt work. Using it like this:
mRecyclerView = (RecyclerView) findViewById(R.id.activity_profile_bottom_recyclerview);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
if(mAdapter == null){
mAdapter = new ProfileAdapter(this, user);
mRecyclerView.setAdapter(mAdapter);
}
mRecyclerView.scrollToPosition(mAdapter.getItemCount() – 1);
While loading a new activity is straight off an easier solution, it should still work fine.
The scrollToPosition scrolls to a specific item in the list. The position specified here is the adapter item’s count position. Is that working for you?
Well, in the layout xml I supplied ib stackoverflow everything works fine except the status bar isn’t transparent. If it works for you (nav view with collapse toolbar), maybe its with the code?
Regarding scrollToPosition, I’ve got 4 items in my recycler view, positions starting from 0 to 3, and scrolling to ANY position just wont work. Any more details I could give that will help to find the problem?
I haven’t tried that out myself yet. If you are loading the collapsible toolbar in a new activity, with the nav view being in another, I don’t see why its not working. In my sample both are separate activities and they work just fine.
Do check my Git link for reference.
Ok my fault!
I realized I haven’t configued the v-21 xml properly, that’s why it didn’t work!
Now, got the last problem: scrollToPosition not working. What can I do? Do you need code of something?
Scrolling was convenient when using a ListView. Its kind of a mess for RecyclerView. But your answer most likely lies in the RecyclerView’s LayoutManager. You should look into that. For instance, this link:
http://bit.ly/1I9HQmi
Thank you for this tutorial. It saved me alot of time.
Glad it helped you.
I can’t compile ‘it.sephiroth.android.library.viewrevealanimator:view-reveal-animator:’ and give the error fail to resolve
That was a library I included for testing. It’s of no relation to the Toolbar Animation. You can bravely remove it 🙂
Thanks for the awesome guide! I’m having a bug I can’t seem to get rid of however. When I collapse the toolbar everything works fine, however, when I expand it everything expands too far down the screen leaving behind an empty space for a toolbar. Do you have any idea why this could be happening? I’m at my wits end… hehe. Thanks!
Hi Jason,
Can you please cross check your code against mine once? I’ve provided a GitHub link to the code source as well. Seems to be a layout issue, so I’d start with the Activity’s xml files.
I got it! In order to get the toolbar to expand completely, I set the scroll flags for it to ‘app:layout_scrollFlags=”scroll|exitUntilCollapsed|enterAlways”. This caused a bug when it was re-expanding. In order to fix it, I removed the ‘enterAlways’ flag from the CollapsingToolbarLayout and placed it instead in the ImageView for the header. This way, only the backdrop enters always. Everything works great now. Thanks!
Exactly why I asked you to cross check. I didn’t include the ‘enterAlways’ flag.
Great that you got it working Jason!
Cheers.
Hi, is there a way to set also a subtitle in CollapsingToolbarLayout?
Hey there,
Sorry to disappoint but the CollapsingToolbarLayout provisions only for a title and not for a subtitle, yet.
Hello! I have implemented animated toolbar with the parallax effect. I am experiencing an issue when the listview when it scrolls underneath the toolbar sometimes.
https://youtu.be/dyzhZZiRfpU
Please follow the provided link address: You would see initially the expected behavior, where the image on top collapses in parallax effect when the list view is in the initial position. However, when the listview is not all the way on the bottom, it tends to move underneath the toolbar when it is scrolled up.
Please share your thoughts. Thank you!
Are you trying to mimic an Instagram type of an effect?
The CollapsingToolbar is intended to work only when there is a large header image followed by a list. So it must contain ONE header image, and a Toolbar.
Have you cross-checked against my layout?
Hello, How can I apply this effect on a listview? I tried replacing recyclerView with listview, but it didn’t work and header remained static.
Hi Prathya,
Please migrate over to RecyclerView for it to work.
is this working on 5.0.2 device?
it is working in 4.x and 5.1 device, but not shown in 5.0.2 device………
I test on a 5.0.0 device, everything works fine in that. Haven’t tried in 5.0.2. Could you specify as to ‘what’ is not working?
I am saying the toolbar is gone. It is the known issue, which you mention it in your post. Really helpful! thank you!
Good Day, i did everything like you said but the header does not resize into a toolbar or anything. it just remains static
Hi there,
Can you cross check your code against mine? Just to make sure you haven’t missed out on anything. I’ve provided a GitHub link at the post end for reference.
Wow, you reply very fast hey. I just went through all your comments and found the solution, I just has to update my recyclerview library. Thank you so much for this hey, been struggling for ages to get this effect. Do you know how I can make the toolbar pop back into the screen when I scroll up and disappear once again as I scroll down?
Just happened to be online 🙂
Add ‘enterAlways’ to the scrollFlags in your CollapsingToolbarLayout. This enables the ‘Quick Return’ pattern which you’re asking for.
Thanks a lot, worked super… Thanks.man, any advice on how to change the toolbar color? I tried everything and it still remains purple
change your colorPrimary in styles.xml
How can I stop the toolbar from collapsing entirely if there isn’t enough content in the nestedScrollView to fill the space below?
That’s weird. Have you added any spacing below your Toolbar? The entire NestedScrollView is supposed to sit directly below the Toolbar. If there isn’t enough content in your scroll view, there would be spacing at the bottom. Not at the top.
Can you post your layout to StackOverflow so I could have a look?
Suleiman19, If I add a layout_gravity=”fill_vertical” to the NestedScrollView it will scroll all the way to the top, but that’s not really what I want either. I’d like to have the CollapsingToolbar stop collapsing as soon as the nested scrollview runs out of content to scroll. Currently, the Contacts app on Android 5.1.1 does this. I will get my code and stackoverflow and post a link.
Do link to your issue at Stack Overflow so I can have a look.
Moreover, you can consider adding an empty View in your NestedScrollView, whose height = the extra height required by the Toolbar to collapse completely. So this would make the NestedScrollView ‘appear’ to have enough content.
http://stackoverflow.com/questions/31117510/stop-collapsingtoolbar-from-collapsing-after-nestedscrollview-runs-out-of-conten
Do check my previous reply. Have you tried that?
I haven’t tried that. I’ve successfully accomplished what you’re suggesting by adding fill_vertical to the nestedScrollview. This causes the scrollview to scroll all the way to the top. However, that’s not what I would like to see. I would like to have the toolbar stop collapsing at whatever point the scrollview runs out of content. I don’t want gaps on top or on bottom.
Ah, I see you don’t want it to collapse entirely. Check this out for me:
http://stackoverflow.com/questions/30655939/android-programmatically-collapse-or-expand-collapsingtoolbarlayout?rq=1
http://stackoverflow.com/questions/31117510/stop-collapsingtoolbar-from-collapsing-after-nestedscrollview-runs-out-of-conten