Argthtjtr

I've a weird crash, apparently unfixable happening on Samsung devices only running Android 8.0.

I've a recyclerView populated in a Fragment that it's launching an Activity.

Here is my ItemHolder layout

<FrameLayout 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:orientation="vertical"

android:layout_width="match_parent"

android:layout_height="@dimen/table_card_header_size"

android:transitionName="@string/team_profile_transition"

android:id="@+id/tableRowMainContainer"

android:background="@drawable/rounded_rect_top"

> ...

Here's is my Intent to the activity with the shared element

private val teamProfileOnClick = View.OnClickListener { v ->

    val teamContainer = v.findViewById<FrameLayout>(R.id.tableRowMainContainer)

    val tag = v.tag as TableRow

    val intent = Intent(context, TeamProfileActivity::class.java)

    intent.putExtra(TeamProfileActivity.TEAM_ID_PROFILE, tag.teamId)

    intent.putExtra(TeamProfileActivity.TEAM_NAME, tag.team.name)

    intent.putExtra(TeamProfileActivity.TEAM_COMPETITION_ID, tableCompetitionId)

    intent.putExtra(TeamProfileActivity.TEAM_TYPE, tag.team.teamType)



    val options = ActivityOptionsCompat.makeSceneTransitionAnimation(context as Activity,

            teamContainer,

            ViewCompat.getTransitionName(teamContainer))

    context.startActivity(intent, options.toBundle())

}

And here is the layout of the destination activity

<FrameLayout

xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tool="http://schemas.android.com/tools"

android:id="@+id/cardview"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:fitsSystemWindows="true"

android:transitionName="@string/team_profile_transition"

app:cardCornerRadius="10dp"

> ...

Here is the crash log

java.lang.NullPointerException: 

  at android.app.ActivityTransitionCoordinator.setSharedElementState (ActivityTransitionCoordinator.java:553)

  at android.app.ActivityTransitionCoordinator.setSharedElementState (ActivityTransitionCoordinator.java:653)

  at android.app.EnterTransitionCoordinator.startSharedElementTransition (EnterTransitionCoordinator.java:428)

  at android.app.EnterTransitionCoordinator.-wrap4 (Unknown Source)

  at android.app.EnterTransitionCoordinator$3.lambda$-android_app_EnterTransitionCoordinator$3_18867 (EnterTransitionCoordinator.java:492)

  at android.app.-$Lambda$CsyQO--8YdRe5wlajUCi-L98enA$1.$m$0 (Unknown Source:8)

  at android.app.-$Lambda$CsyQO--8YdRe5wlajUCi-L98enA$1.run (Unknown Source)

  at android.app.ActivityTransitionCoordinator.startTransition (ActivityTransitionCoordinator.java:902)

  at android.app.EnterTransitionCoordinator$3.lambda$-android_app_EnterTransitionCoordinator$3_18819 (EnterTransitionCoordinator.java:491)

  at android.app.-$Lambda$CsyQO--8YdRe5wlajUCi-L98enA$2.$m$0 (Unknown Source:8)

  at android.app.-$Lambda$CsyQO--8YdRe5wlajUCi-L98enA$2.run (Unknown Source)

  at com.android.internal.view.OneShotPreDrawListener.onPreDraw (OneShotPreDrawListener.java:78)

  at android.view.ViewTreeObserver.dispatchOnPreDraw (ViewTreeObserver.java:1045)

  at android.view.ViewRootImpl.performTraversals (ViewRootImpl.java:2800)

  at android.view.ViewRootImpl.doTraversal (ViewRootImpl.java:1779)

  at android.view.ViewRootImpl$TraversalRunnable.run (ViewRootImpl.java:7810)

  at android.view.Choreographer$CallbackRecord.run (Choreographer.java:911)

  at android.view.Choreographer.doCallbacks (Choreographer.java:723)

  at android.view.Choreographer.doFrame (Choreographer.java:658)

  at android.view.Choreographer$FrameDisplayEventReceiver.run (Choreographer.java:897)

  at android.os.Handler.handleCallback (Handler.java:789)

  at android.os.Handler.dispatchMessage (Handler.java:98)

  at android.os.Looper.loop (Looper.java:164)

  at android.app.ActivityThread.main (ActivityThread.java:6938)

  at java.lang.reflect.Method.invoke (Native Method)

  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)

  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)

The solution I found is the following :
Freeze/unfreeze the recyclerView when opening the shared element :

 override fun onPause() {

    super.onPause()

    tableCardStack.isLayoutFrozen = true

}



override fun onResume() {

    super.onResume()

    tableCardStack.isLayoutFrozen = false

}

What I've noticed was that the view I was animating was not animating back to the right position. So I thought to freeze the layout. I know it's not the best solution but I couldn't find anything better