Android shared element transition between two activities does not work

Question

In my app I'm trying to use the newly introduced element sharing between activities. Everything works like a charm if the shared element is with fixed position (e.g. android:layout_gravity="top") but the problem comes when the view is anchored.

My first activity looks like this:

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/tools"
    xmlns:auto="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        ...
    </android.support.design.widget.AppBarLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/play_all"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|right"
        android:layout_margin="24dp"/>

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

My second activity looks like this

<android.support.design.widget.CoordinatorLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:auto="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/play"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:elevation="10dp"
        android:src="@drawable/ic_action_play"
        auto:layout_anchor="@+id/appbar"
        android:transitionName="fab_button"
        auto:layout_anchorGravity="bottom|right" />

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="192dp">
        ...
    </android.support.design.widget.AppBarLayout>

    ...

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

The code I use is as follows:

Intent intent = ...;
ActivityOptions options = ActivityOptions.makeSceneTransitionAnimation(this, view, "fab_button");
startActivity(intent, options.toBundle());

If I use the layout_anchor and layout_anchorGravity attributes the transition between the two FABs is done with no animation. If the second FAB is with fixed position, it works perfectly. What am I doing wrong?

Answer 1

This might be a bit late, but I found a way around the issue. You have to wrap your shared element into a layout, and put the anchor on that layout:

<FrameLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        auto:layout_anchor="@+id/appbar"
        auto:layout_anchorGravity="bottom|right">

    <android.support.design.widget.FloatingActionButton
            android:id="@+id/play"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="16dp"
            android:elevation="10dp"
            android:src="@drawable/ic_action_play"
            android:transitionName="fab_button" />

<FrameLayout/>

Answer 2

Activity Shared Elements Transitions:

Follow the steps.

1. Enable Window Content Transitions
2. Assign a Common Transition Name
3. Start Activity
4. Multiple Shared Elements
5. Customizing Shared Elements Transition

I think you do not have follow the second step. You had given android:transitionName="fab_button" in Second Activity but not given in First Activity.

XML of First Activity (added android:transitionName="fab_button"):

<android.support.design.widget.FloatingActionButton

        android:transitionName="fab_button"

        android:id="@+id/play_all"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|right"
        android:layout_margin="24dp"/>

May above links will helps you.