Add initial shared element transition between conversation list and stories.

app/src/main/java/org/thoughtcrime/securesms/main/MainActivityListHostFragment.kt

@@ -15,6 +15,7 @@ import androidx.fragment.app.viewModels
 import androidx.navigation.NavController
 import androidx.navigation.NavDestination
 import androidx.navigation.findNavController
+import androidx.navigation.fragment.FragmentNavigatorExtras
 import org.signal.core.util.concurrent.SimpleTask
 import org.signal.core.util.logging.Log
 import org.thoughtcrime.securesms.MainActivity
@@ -105,7 +106,12 @@ class MainActivityListHostFragment : Fragment(R.layout.main_activity_list_host_f
     if (state.tab == ConversationListTab.CHATS) {
       return
     } else {
-      navController.navigate(R.id.action_conversationListFragment_to_storiesLandingFragment)
+      navController.navigate(
+        R.id.action_conversationListFragment_to_storiesLandingFragment,
+        null,
+        null,
+        FragmentNavigatorExtras(requireView().findViewById<View>(R.id.camera_fab) to "camera_fab")
+      )
     }
   }
 

app/src/main/java/org/thoughtcrime/securesms/stories/landing/StoriesLandingFragment.kt

@@ -4,6 +4,7 @@ import android.Manifest
 import android.content.Intent
 import android.graphics.Color
 import android.os.Bundle
+import android.transition.TransitionInflater
 import android.view.Menu
 import android.view.MenuInflater
 import android.view.MenuItem
@@ -73,6 +74,8 @@ class StoriesLandingFragment : DSLSettingsFragment(layoutId = R.layout.stories_l
     emptyNotice = requireView().findViewById(R.id.empty_notice)
     cameraFab = requireView().findViewById(R.id.camera_fab)
 
+    sharedElementEnterTransition = TransitionInflater.from(requireContext()).inflateTransition(R.transition.change_transform)
+
     cameraFab.setOnClickListener {
       Permissions.with(this)
         .request(Manifest.permission.CAMERA)

app/src/main/res/layout/conversation_list_fragment.xml

@@ -110,6 +110,7 @@
             app:layout_behavior="org.thoughtcrime.securesms.util.views.SlideUpWithSnackbarBehavior">
 
             <org.thoughtcrime.securesms.components.registration.PulsingFloatingActionButton
+                android:transitionName="camera_fab"
                 android:id="@+id/camera_fab"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"

app/src/main/res/layout/stories_landing_fragment.xml

@@ -34,6 +34,7 @@
         android:contentDescription="@string/conversation_list_fragment__open_camera_description"
         android:focusable="true"
         android:theme="@style/Widget.Material3.FloatingActionButton.Secondary"
+        android:transitionName="camera_fab"
         app:backgroundTint="@color/signal_colorPrimaryContainer"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"