IssueTracker

Workaround: wrap your View in a CoordinatorLayout

Yes. Got the same issue over here

wrapping it into the coordinator layout worked. Thanks a lot Joe!

Wrapping inside a CoordinatorLayout is a pretty crummy solution. Is there any possibility of a point update that fixes this?

Same problem here. Our FAB is already residing directly inside a CoordinatorLayout among other children.

08-19 17:30:29.892 26080 26080 E AndroidRuntime: java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams cannot be cast to android.support.design.widget.CoordinatorLayout$LayoutParams
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.support.design.widget.FloatingActionButton$Behavior.isBottomSheet(FloatingActionButton.java:597)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.support.design.widget.FloatingActionButton$Behavior.onDependentViewChanged(FloatingActionButton.java:589)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.support.design.widget.FloatingActionButton$Behavior.onDependentViewChanged(FloatingActionButton.java:528)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.support.design.widget.CoordinatorLayout.offsetChildToAnchor(CoordinatorLayout.java:1564)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.support.design.widget.CoordinatorLayout.onChildViewsChanged(CoordinatorLayout.java:1233)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.support.design.widget.CoordinatorLayout$OnPreDrawListener.onPreDraw(CoordinatorLayout.java:1812)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2201)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1246)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6301)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.view.Choreographer.doCallbacks(Choreographer.java:683)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.view.Choreographer.doFrame(Choreographer.java:619)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.os.Handler.handleCallback(Handler.java:751)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:95)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:154)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:6077)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
08-19 17:30:29.892 26080 26080 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

same error.... i hope in a solution

Same problem here and wrapping with a plain CoordinatorLayout with only weight and height worked for me too.

Does sdk23 work? We all on sdk24 imo.

the solution for me:

the anchor value want only direct child of coordinatorlayout

<CoordinatorLayout>
     <LinearLayout
       id=direct child>
        <LinearLayout
         id= no direct child>
            <View>
        </LinearLayout>
    <LinearLayout>
<Fab
anchor= id = direct child>
</CoordinatorLayout>

sorry for my english, this work for me

[Comment deleted]

Same issue here, I successfully stopped the crashes by changing the anchor on the FAB, I was not targeting the main parent layout at first.

Same issue here, I had my FAB anchored to a CardView

Same issue. Happening since I updated my SDK 24. Still no help. It's a bug from Google side because it has been working since past 10 months.

Found a solution.
My earlier XML looked like this:
<CoordinatorLayout>
     <LinearLayout
       id=direct child>
        <ImageView
        id = no_direct_child>        //fab anchor
        <LinearLayout
         id= no direct child>
            <View>
        </LinearLayout>
    <LinearLayout>
<Fab
anchor= id = direct child>
</CoordinatorLayout>

New XML:
<CoordinatorLayout>
     <ImageView
        id = direct_child>        //fab anchor
     <LinearLayout
       id=direct child>
        <LinearLayout
         id= no direct child>
            <View>
        </LinearLayout>
    <LinearLayout>
<Fab
anchor= id = direct child>
</CoordinatorLayout>

Hope this helps.

Totally agree with #17, today I've updated my SDK to 24 and the issue has started. With version 23 everything works fine.
Any solution?

Same here. 23.2.0 was working fine.

Same issue, any solution ?

As said in #2, wrap your anchor object in <CoordinatorLayout> and add the layout_width/height attributes as appropiate and nothing more.
This works for me.

This seems like a simple ClassCastException while using the CoordinatorLayout.ParamLayout as if they were ViewGroup.ParamLayout.

ok give some example or blog if the issue is resolved

Ok.

My initial, throwing exceptions, xml layout was 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:id="@+id/topView"
    style="@style/TopFragment"
    android:fillViewport="true">

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipeRefreshLayout"
        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/itemsRecyclerView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:cacheColorHint="@android:color/transparent"
            android:requiresFadingEdge="none"
            android:scrollbars="vertical" />
    </android.support.v4.widget.SwipeRefreshLayout>

    <android.support.constraint.ConstraintLayout
        android:id="@+id/fabContainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="@+id/topView"
        app:layout_constraintRight_toRightOf="@+id/topView">

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/giveFloatButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|right"
            style="@style/FloatingActionButton"
            android:clickable="true"
            app:fabSize="normal"
            app:layout_constraintBottom_toBottomOf="@+id/fabContainer"
            app:layout_constraintRight_toRightOf="@+id/fabContainer" />

        <!--- the rest of my layout --->

    </android.support.constraint.ConstraintLayout>

   
    <!--- the rest of my layout --->

</android.support.design.widget.CoordinatorLayout>

Now, after wrapping, it looks like:

<?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:id="@+id/topView"
    style="@style/TopFragment"
    android:fillViewport="true">

    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipeRefreshLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <android.support.design.widget.CoordinatorLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/itemsRecyclerView"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:cacheColorHint="@android:color/transparent"
                android:requiresFadingEdge="none"
                android:scrollbars="vertical" />
        </android.support.design.widget.CoordinatorLayout>
    </android.support.v4.widget.SwipeRefreshLayout>

    <android.support.constraint.ConstraintLayout
        android:id="@+id/fabContainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="@+id/topView"
        app:layout_constraintRight_toRightOf="@+id/topView">

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/giveFloatButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|right"
            style="@style/FloatingActionButton"
            android:clickable="true"
            app:fabSize="normal"
            app:layout_constraintBottom_toBottomOf="@+id/fabContainer"
            app:layout_constraintRight_toRightOf="@+id/fabContainer" />


        <!--- the rest of my layout --->

    </android.support.constraint.ConstraintLayout>

   
    <!--- the rest of my layout --->

</android.support.design.widget.CoordinatorLayout>


Hope it helps

How can I see changes in source code between 24.2.0 and 24.2.1?
I cloned https://android.googlesource.com/platform/frameworks/support but latest commit is dated by July 1 and there are no tags that looks like Android Support Library versions.
I also created SO question http://stackoverflow.com/q/39271969/746347.

I can confirm this has been fixed with the recent release of 24.2.1

Fixed in the 24.2.1 of the support library

I have same issue in support libraries 24.2.1 and 25.0.1.
FAB shows fine only when anchor set to direct child of coordinator layout.

Issue is happened only on first inflate UI, after that behaviour and gravity of FAB is OK.

#33 & #34 I had the same issue. Take a look at my solution at http://stackoverflow.com/a/40935790/2358687

Got the same issue since upgrade from support libraries 23.1.1 up to 25.0.1.
Seems like #35 is my current working, preferred solution.

Often my FAB was displayed at the top left cornor instead bottom right on it's anchor (like described in http://stackoverflow.com/a/40935790/2358687). I simply have a CoordninatorLayout with a RecyclerView and the FAB within.

Initially I wanted to align the FAB via anchor definition in XML:
app:layout_anchor="@id/recyclerView"
app:layout_anchorGravity="bottom|end"

I replaced the app:layout_anchor* attributes by
android:layout_gravity="bottom|end"

Thanks dingenen!

I am having the same issue with #34.

I have a recyclerview list item containing a FAB that is anchored to an imageView all in a CardView. On view inflation some of the FAB doesn't seem to anchor to the view. But after scrolling down and up, the fab corrects its position.