diff --git a/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java b/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
index c80818a..b8ce818 100644
--- a/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
+++ b/quickstep/src/com/android/launcher3/BaseQuickstepLauncher.java
@@ -349,7 +349,7 @@
         mActionsView = findViewById(R.id.overview_actions_view);
         RecentsView overviewPanel = (RecentsView) getOverviewPanel();
         SplitSelectStateController controller =
-                new SplitSelectStateController(SystemUiProxy.INSTANCE.get(this));
+                new SplitSelectStateController(mHandler, SystemUiProxy.INSTANCE.get(this));
         overviewPanel.init(mActionsView, controller);
         mActionsView.setDp(getDeviceProfile());
         mActionsView.updateVerticalMargin(SysUINavigationMode.getMode(this));
diff --git a/quickstep/src/com/android/quickstep/RecentsActivity.java b/quickstep/src/com/android/quickstep/RecentsActivity.java
index cc6cfd7..03e2395 100644
--- a/quickstep/src/com/android/quickstep/RecentsActivity.java
+++ b/quickstep/src/com/android/quickstep/RecentsActivity.java
@@ -122,7 +122,7 @@
         SYSUI_PROGRESS.set(getRootView().getSysUiScrim(), 0f);
 
         SplitSelectStateController controller =
-                new SplitSelectStateController(SystemUiProxy.INSTANCE.get(this));
+                new SplitSelectStateController(mHandler, SystemUiProxy.INSTANCE.get(this));
         mDragLayer.recreateControllers();
         mFallbackRecentsView.init(mActionsView, controller);
     }
diff --git a/quickstep/src/com/android/quickstep/TaskViewUtils.java b/quickstep/src/com/android/quickstep/TaskViewUtils.java
index 23dc913..37d88ae 100644
--- a/quickstep/src/com/android/quickstep/TaskViewUtils.java
+++ b/quickstep/src/com/android/quickstep/TaskViewUtils.java
@@ -35,6 +35,7 @@
 import static com.android.launcher3.anim.Interpolators.clampToProgress;
 import static com.android.launcher3.config.FeatureFlags.ENABLE_QUICKSTEP_LIVE_TILE;
 import static com.android.launcher3.statehandlers.DepthController.DEPTH;
+import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
 import static com.android.systemui.shared.system.RemoteAnimationTargetCompat.MODE_CLOSING;
 import static com.android.systemui.shared.system.RemoteAnimationTargetCompat.MODE_OPENING;
 
@@ -42,6 +43,7 @@
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
+import android.animation.ValueAnimator;
 import android.annotation.TargetApi;
 import android.content.ComponentName;
 import android.content.Context;
@@ -79,6 +81,8 @@
 import com.android.systemui.shared.system.RemoteAnimationTargetCompat;
 import com.android.systemui.shared.system.SyncRtSurfaceTransactionApplierCompat.SurfaceParams;
 
+import java.util.ArrayList;
+
 /**
  * Utility class for helpful methods related to {@link TaskView} objects and their tasks.
  */
@@ -427,34 +431,64 @@
             @NonNull RemoteAnimationTargetCompat[] wallpaperTargets,
             @NonNull RemoteAnimationTargetCompat[] nonAppTargets,
             @NonNull Runnable finishCallback) {
+        final ArrayList<SurfaceControl> openingTargets = new ArrayList<>();
+        final ArrayList<SurfaceControl> closingTargets = new ArrayList<>();
 
-        final int[] splitRoots = new int[2];
-        for (int i = 0; i < appTargets.length; ++i) {
-            final int taskId = appTargets[i].taskInfo != null ? appTargets[i].taskInfo.taskId : -1;
-            final int mode = appTargets[i].mode;
-            if (taskId == initialTask.key.id || taskId == secondTask.key.id) {
-                if (mode != MODE_OPENING) {
-                    throw new IllegalStateException(
-                            "Expected task to be opening, but it is " + mode);
-                }
-                splitRoots[taskId == initialTask.key.id ? 0 : 1] = i;
+        for (RemoteAnimationTargetCompat appTarget : appTargets) {
+            final int taskId = appTarget.taskInfo != null ? appTarget.taskInfo.taskId : -1;
+            final int mode = appTarget.mode;
+            final SurfaceControl leash = appTarget.leash.getSurfaceControl();
+            if (leash == null) {
+                continue;
+            }
+
+            if (mode == MODE_OPENING) {
+                openingTargets.add(leash);
+            } else if (taskId == initialTask.key.id || taskId == secondTask.key.id) {
+                throw new IllegalStateException("Expected task to be opening, but it is " + mode);
+            } else if (mode == MODE_CLOSING) {
+                closingTargets.add(leash);
             }
         }
 
-        SurfaceControl.Transaction t = new SurfaceControl.Transaction();
-
-        // This is where we should animate the split roots. For now, though, just make them visible.
-        for (int i = 0; i < 2; ++i) {
-            t.show(appTargets[splitRoots[i]].leash.getSurfaceControl());
-            t.setAlpha(appTargets[splitRoots[i]].leash.getSurfaceControl(), 1.f);
+        for (int i = 0; i < nonAppTargets.length; ++i) {
+            final SurfaceControl leash = appTargets[i].leash.getSurfaceControl();
+            if (nonAppTargets[i].windowType == TYPE_DOCK_DIVIDER && leash != null) {
+                openingTargets.add(leash);
+            }
         }
 
-        // This contains the initial state (before animation), so apply this at the beginning of
-        // the animation.
-        t.apply();
+        final SurfaceControl.Transaction t = new SurfaceControl.Transaction();
+        ValueAnimator animator = ValueAnimator.ofFloat(0f, 1f);
+        animator.addUpdateListener(valueAnimator -> {
+            float progress = valueAnimator.getAnimatedFraction();
+            for (SurfaceControl leash: openingTargets) {
+                t.setAlpha(leash, progress);
+            }
+            for (SurfaceControl leash: closingTargets) {
+                t.setAlpha(leash, 1 - progress);
+            }
+            t.apply();
+        });
+        animator.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationStart(Animator animation) {
+                for (SurfaceControl leash: openingTargets) {
+                    t.show(leash).setAlpha(leash, 0.0f);
+                }
+                t.apply();
+            }
 
-        // Once there is an animation, this should be called AFTER the animation completes.
-        finishCallback.run();
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                for (SurfaceControl leash: closingTargets) {
+                    t.hide(leash);
+                }
+                super.onAnimationEnd(animation);
+                finishCallback.run();
+            }
+        });
+        animator.start();
     }
 
     public static void composeRecentsLaunchAnimator(@NonNull AnimatorSet anim, @NonNull View v,
diff --git a/quickstep/src/com/android/quickstep/util/SplitSelectStateController.java b/quickstep/src/com/android/quickstep/util/SplitSelectStateController.java
index 3069504..e9a695d 100644
--- a/quickstep/src/com/android/quickstep/util/SplitSelectStateController.java
+++ b/quickstep/src/com/android/quickstep/util/SplitSelectStateController.java
@@ -16,17 +16,20 @@
 
 package com.android.quickstep.util;
 
+import static com.android.launcher3.Utilities.postAsyncCallback;
 import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
 import static com.android.launcher3.util.SplitConfigurationOptions.STAGE_POSITION_BOTTOM_OR_RIGHT;
 import static com.android.launcher3.util.SplitConfigurationOptions.STAGE_POSITION_TOP_OR_LEFT;
 
 import android.app.ActivityThread;
 import android.graphics.Rect;
+import android.os.Handler;
 import android.os.IBinder;
 import android.view.RemoteAnimationAdapter;
 import android.view.SurfaceControl;
 import android.window.TransitionInfo;
 
+import com.android.launcher3.Utilities;
 import com.android.launcher3.util.SplitConfigurationOptions;
 import com.android.launcher3.util.SplitConfigurationOptions.StagePosition;
 import com.android.quickstep.SystemUiProxy;
@@ -47,13 +50,15 @@
  */
 public class SplitSelectStateController {
 
+    private final Handler mHandler;
     private final SystemUiProxy mSystemUiProxy;
     private @StagePosition int mStagePosition;
     private Task mInitialTask;
     private Task mSecondTask;
     private Rect mInitialBounds;
 
-    public SplitSelectStateController(SystemUiProxy systemUiProxy) {
+    public SplitSelectStateController(Handler handler, SystemUiProxy systemUiProxy) {
+        mHandler = handler;
         mSystemUiProxy = systemUiProxy;
     }
 
@@ -70,9 +75,9 @@
     /**
      * To be called after second task selected
      */
-    public void setSecondTaskId(Task taskView) {
+    public void setSecondTaskId(Task taskView, Consumer<Boolean> callback) {
         mSecondTask = taskView;
-        launchTasks(mInitialTask, mSecondTask, mStagePosition, null /*callback*/);
+        launchTasks(mInitialTask, mSecondTask, mStagePosition, callback);
     }
 
     /**
@@ -151,22 +156,27 @@
         public void onAnimationStart(int transit, RemoteAnimationTargetCompat[] apps,
                 RemoteAnimationTargetCompat[] wallpapers, RemoteAnimationTargetCompat[] nonApps,
                 Runnable finishedCallback) {
-            TaskViewUtils.composeRecentsSplitLaunchAnimatorLegacy(mInitialTask,
-                    mSecondTask, apps, wallpapers, nonApps, () -> {
-                        finishedCallback.run();
-                        if (mSuccessCallback != null) {
-                            mSuccessCallback.accept(true);
-                        }
-                    });
+            postAsyncCallback(mHandler,
+                    () -> TaskViewUtils.composeRecentsSplitLaunchAnimatorLegacy(mInitialTask,
+                            mSecondTask, apps, wallpapers, nonApps, () -> {
+                                finishedCallback.run();
+                                if (mSuccessCallback != null) {
+                                    mSuccessCallback.accept(true);
+                                }
+                            }));
+
             // After successful launch, call resetState
             resetState();
         }
 
         @Override
         public void onAnimationCancelled() {
-            if (mSuccessCallback != null) {
-                mSuccessCallback.accept(false);
-            }
+            postAsyncCallback(mHandler, () -> {
+                if (mSuccessCallback != null) {
+                    mSuccessCallback.accept(false);
+                }
+            });
+
             resetState();
         }
     }
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index cb8e7f7..5794396 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -3836,10 +3836,9 @@
         mSecondFloatingTaskView.addAnimation(pendingAnimation, secondTaskStartingBounds,
                 secondTaskEndingBounds, taskView.getThumbnail(),
                 true /*fadeWithThumbnail*/);
-        pendingAnimation.addEndListener(aBoolean -> {
-            mSplitSelectStateController.setSecondTaskId(taskView.getTask());
-            resetFromSplitSelectionState();
-        });
+        pendingAnimation.addEndListener(aBoolean ->
+                mSplitSelectStateController.setSecondTaskId(taskView.getTask(),
+                aBoolean1 -> RecentsView.this.resetFromSplitSelectionState()));
         mSecondSplitHiddenTaskView = taskView;
         taskView.setVisibility(INVISIBLE);
         pendingAnimation.buildAnim().start();