diff --git a/libs/WindowManager/Shell/res/layout/split_decor.xml b/libs/WindowManager/Shell/res/layout/split_decor.xml
new file mode 100644
index 0000000..9ffa5e8
--- /dev/null
+++ b/libs/WindowManager/Shell/res/layout/split_decor.xml
@@ -0,0 +1,30 @@
+<!--
+  ~ Copyright (C) 2021 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_height="match_parent"
+    android:layout_width="match_parent">
+
+    <ImageView android:id="@+id/split_resizing_icon"
+               android:layout_height="wrap_content"
+               android:layout_width="wrap_content"
+               android:layout_gravity="center"
+               android:padding="0dp"
+               android:visibility="gone"
+               android:background="@null"/>
+
+</FrameLayout>
diff --git a/libs/WindowManager/Shell/res/layout/split_outline.xml b/libs/WindowManager/Shell/res/layout/split_outline.xml
index 13a30f5..6cb9ebb 100644
--- a/libs/WindowManager/Shell/res/layout/split_outline.xml
+++ b/libs/WindowManager/Shell/res/layout/split_outline.xml
@@ -1,18 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (C) 2021 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
+<!--
+  ~ Copyright (C) 2021 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
 <FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/ShellCommandHandlerImpl.java b/libs/WindowManager/Shell/src/com/android/wm/shell/ShellCommandHandlerImpl.java
index 9113c79..e87b150 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/ShellCommandHandlerImpl.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/ShellCommandHandlerImpl.java
@@ -103,8 +103,6 @@
                 return runMoveToSideStage(args, pw);
             case "removeFromSideStage":
                 return runRemoveFromSideStage(args, pw);
-            case "setSideStageOutline":
-                return runSetSideStageOutline(args, pw);
             case "setSideStagePosition":
                 return runSetSideStagePosition(args, pw);
             case "setSideStageVisibility":
@@ -163,18 +161,6 @@
         return true;
     }
 
-    private boolean runSetSideStageOutline(String[] args, PrintWriter pw) {
-        if (args.length < 3) {
-            // First arguments are "WMShell" and command name.
-            pw.println("Error: whether to enable or disable side stage outline border should be"
-                    + " provided as arguments");
-            return false;
-        }
-        final boolean enable = new Boolean(args[2]);
-        mSplitScreenOptional.ifPresent(split -> split.setSideStageOutline(enable));
-        return true;
-    }
-
     private boolean runSetSideStagePosition(String[] args, PrintWriter pw) {
         if (args.length < 3) {
             // First arguments are "WMShell" and command name.
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/apppairs/AppPair.java b/libs/WindowManager/Shell/src/com/android/wm/shell/apppairs/AppPair.java
index 6a252e0..c8449a3 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/apppairs/AppPair.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/apppairs/AppPair.java
@@ -131,7 +131,8 @@
         mSplitLayout = new SplitLayout(TAG + "SplitDivider",
                 mDisplayController.getDisplayContext(mRootTaskInfo.displayId),
                 mRootTaskInfo.configuration, this /* layoutChangeListener */,
-                mParentContainerCallbacks, mDisplayImeController, mController.getTaskOrganizer());
+                mParentContainerCallbacks, mDisplayImeController, mController.getTaskOrganizer(),
+                true /* applyDismissingParallax */);
         mDisplayInsetsController.addInsetsChangedListener(mRootTaskInfo.displayId, mSplitLayout);
 
         final WindowContainerToken token1 = task1.token;
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/common/SurfaceUtils.java b/libs/WindowManager/Shell/src/com/android/wm/shell/common/SurfaceUtils.java
index 55c5125..4b138e4 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/common/SurfaceUtils.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/common/SurfaceUtils.java
@@ -23,16 +23,22 @@
  * Helpers for handling surface.
  */
 public class SurfaceUtils {
-    /** Creates a dim layer above indicated host surface. */
+    /** Creates a dim layer above host surface. */
     public static SurfaceControl makeDimLayer(SurfaceControl.Transaction t, SurfaceControl host,
             String name, SurfaceSession surfaceSession) {
-        SurfaceControl dimLayer = new SurfaceControl.Builder(surfaceSession)
+        final SurfaceControl dimLayer = makeColorLayer(host, name, surfaceSession);
+        t.setLayer(dimLayer, Integer.MAX_VALUE).setColor(dimLayer, new float[]{0f, 0f, 0f});
+        return dimLayer;
+    }
+
+    /** Creates a color layer for host surface. */
+    public static SurfaceControl makeColorLayer(SurfaceControl host, String name,
+            SurfaceSession surfaceSession) {
+        return new SurfaceControl.Builder(surfaceSession)
                 .setParent(host)
                 .setColorLayer()
                 .setName(name)
-                .setCallsite("SurfaceUtils.makeDimLayer")
+                .setCallsite("SurfaceUtils.makeColorLayer")
                 .build();
-        t.setLayer(dimLayer, Integer.MAX_VALUE).setColor(dimLayer, new float[]{0f, 0f, 0f});
-        return dimLayer;
     }
 }
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitDecorManager.java b/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitDecorManager.java
new file mode 100644
index 0000000..ad9ebb2
--- /dev/null
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitDecorManager.java
@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.wm.shell.common.split;
+
+import static android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
+import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
+import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_NO_MOVE_ANIMATION;
+import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_TRUSTED_OVERLAY;
+import static android.view.WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
+import static android.view.WindowManagerPolicyConstants.SPLIT_DIVIDER_LAYER;
+
+import android.app.ActivityManager;
+import android.content.Context;
+import android.content.res.Configuration;
+import android.graphics.Color;
+import android.graphics.PixelFormat;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.os.Binder;
+import android.view.IWindow;
+import android.view.LayoutInflater;
+import android.view.SurfaceControl;
+import android.view.SurfaceControlViewHost;
+import android.view.SurfaceSession;
+import android.view.View;
+import android.view.WindowManager;
+import android.view.WindowlessWindowManager;
+import android.widget.FrameLayout;
+import android.widget.ImageView;
+
+import com.android.launcher3.icons.IconProvider;
+import com.android.wm.shell.R;
+import com.android.wm.shell.common.SurfaceUtils;
+
+/**
+ * Handles split decor like showing resizing hint for a specific split.
+ */
+public class SplitDecorManager extends WindowlessWindowManager {
+    private static final String TAG = SplitDecorManager.class.getSimpleName();
+    private static final String RESIZING_BACKGROUND_SURFACE_NAME = "ResizingBackground";
+
+    private final IconProvider mIconProvider;
+    private final SurfaceSession mSurfaceSession;
+
+    private Drawable mIcon;
+    private ImageView mResizingIconView;
+    private SurfaceControlViewHost mViewHost;
+    private SurfaceControl mHostLeash;
+    private SurfaceControl mIconLeash;
+    private SurfaceControl mBackgroundLeash;
+
+    public SplitDecorManager(Configuration configuration, IconProvider iconProvider,
+            SurfaceSession surfaceSession) {
+        super(configuration, null /* rootSurface */, null /* hostInputToken */);
+        mIconProvider = iconProvider;
+        mSurfaceSession = surfaceSession;
+    }
+
+    @Override
+    protected void attachToParentSurface(IWindow window, SurfaceControl.Builder b) {
+        // Can't set position for the ViewRootImpl SC directly. Create a leash to manipulate later.
+        final SurfaceControl.Builder builder = new SurfaceControl.Builder(new SurfaceSession())
+                .setContainerLayer()
+                .setName(TAG)
+                .setHidden(true)
+                .setParent(mHostLeash)
+                .setCallsite("SplitDecorManager#attachToParentSurface");
+        mIconLeash = builder.build();
+        b.setParent(mIconLeash);
+    }
+
+    /** Inflates split decor surface on the root surface. */
+    public void inflate(Context context, SurfaceControl rootLeash, Rect rootBounds) {
+        if (mIconLeash != null && mViewHost != null) {
+            return;
+        }
+
+        context = context.createWindowContext(context.getDisplay(), TYPE_APPLICATION_OVERLAY,
+                null /* options */);
+        mHostLeash = rootLeash;
+        mViewHost = new SurfaceControlViewHost(context, context.getDisplay(), this);
+
+        final FrameLayout rootLayout = (FrameLayout) LayoutInflater.from(context)
+                .inflate(R.layout.split_decor, null);
+        mResizingIconView = rootLayout.findViewById(R.id.split_resizing_icon);
+
+        final WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
+                0 /* width */, 0 /* height */, TYPE_APPLICATION_OVERLAY,
+                FLAG_NOT_FOCUSABLE | FLAG_NOT_TOUCHABLE, PixelFormat.TRANSLUCENT);
+        lp.width = rootBounds.width();
+        lp.height = rootBounds.height();
+        lp.token = new Binder();
+        lp.setTitle(TAG);
+        lp.privateFlags |= PRIVATE_FLAG_NO_MOVE_ANIMATION | PRIVATE_FLAG_TRUSTED_OVERLAY;
+        // TODO(b/189839391): Set INPUT_FEATURE_NO_INPUT_CHANNEL after WM supports
+        //  TRUSTED_OVERLAY for windowless window without input channel.
+        mViewHost.setView(rootLayout, lp);
+    }
+
+    /** Releases the surfaces for split decor. */
+    public void release(SurfaceControl.Transaction t) {
+        if (mViewHost != null) {
+            mViewHost.release();
+            mViewHost = null;
+        }
+        if (mIconLeash != null) {
+            t.remove(mIconLeash);
+            mIconLeash = null;
+        }
+        if (mBackgroundLeash != null) {
+            t.remove(mBackgroundLeash);
+            mBackgroundLeash = null;
+        }
+        mHostLeash = null;
+        mIcon = null;
+        mResizingIconView = null;
+    }
+
+    /** Showing resizing hint. */
+    public void onResizing(ActivityManager.RunningTaskInfo resizingTask, Rect newBounds,
+            SurfaceControl.Transaction t) {
+        if (mResizingIconView == null) {
+            return;
+        }
+
+        if (mIcon == null) {
+            // TODO: add fade-in animation.
+            mBackgroundLeash = SurfaceUtils.makeColorLayer(mHostLeash,
+                    RESIZING_BACKGROUND_SURFACE_NAME, mSurfaceSession);
+            t.setColor(mBackgroundLeash, getResizingBackgroundColor(resizingTask))
+                    .setLayer(mBackgroundLeash, SPLIT_DIVIDER_LAYER - 1)
+                    .show(mBackgroundLeash);
+
+            mIcon = mIconProvider.getIcon(resizingTask.topActivityInfo);
+            mResizingIconView.setImageDrawable(mIcon);
+            mResizingIconView.setVisibility(View.VISIBLE);
+
+            WindowManager.LayoutParams lp =
+                    (WindowManager.LayoutParams) mViewHost.getView().getLayoutParams();
+            lp.width = mIcon.getIntrinsicWidth();
+            lp.height = mIcon.getIntrinsicHeight();
+            mViewHost.relayout(lp);
+            t.show(mIconLeash).setLayer(mIconLeash, SPLIT_DIVIDER_LAYER);
+        }
+
+        t.setPosition(mIconLeash,
+                newBounds.width() / 2 - mIcon.getIntrinsicWidth() / 2,
+                newBounds.height() / 2 - mIcon.getIntrinsicWidth() / 2);
+    }
+
+    /** Stops showing resizing hint. */
+    public void onResized(Rect newBounds, SurfaceControl.Transaction t) {
+        if (mResizingIconView == null) {
+            return;
+        }
+
+        if (mIcon != null) {
+            mResizingIconView.setVisibility(View.GONE);
+            mResizingIconView.setImageDrawable(null);
+            t.remove(mBackgroundLeash).hide(mIconLeash);
+            mIcon = null;
+            mBackgroundLeash = null;
+        }
+    }
+
+    private static float[] getResizingBackgroundColor(ActivityManager.RunningTaskInfo taskInfo) {
+        final int taskBgColor = taskInfo.taskDescription.getBackgroundColor();
+        return Color.valueOf(taskBgColor == -1 ? Color.WHITE : taskBgColor).getComponents();
+    }
+}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitLayout.java b/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitLayout.java
index b1b0382..a9ed64c 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitLayout.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitLayout.java
@@ -103,7 +103,7 @@
     private final SplitWindowManager mSplitWindowManager;
     private final DisplayImeController mDisplayImeController;
     private final ImePositionProcessor mImePositionProcessor;
-    private final DismissingParallaxPolicy mDismissingParallaxPolicy;
+    private final DismissingEffectPolicy mDismissingEffectPolicy;
     private final ShellTaskOrganizer mTaskOrganizer;
     private final InsetsState mInsetsState = new InsetsState();
 
@@ -119,7 +119,8 @@
     public SplitLayout(String windowName, Context context, Configuration configuration,
             SplitLayoutHandler splitLayoutHandler,
             SplitWindowManager.ParentContainerCallbacks parentContainerCallbacks,
-            DisplayImeController displayImeController, ShellTaskOrganizer taskOrganizer) {
+            DisplayImeController displayImeController, ShellTaskOrganizer taskOrganizer,
+            boolean applyDismissingParallax) {
         mContext = context.createConfigurationContext(configuration);
         mOrientation = configuration.orientation;
         mRotation = configuration.windowConfiguration.getRotation();
@@ -129,7 +130,7 @@
                 parentContainerCallbacks);
         mTaskOrganizer = taskOrganizer;
         mImePositionProcessor = new ImePositionProcessor(mContext.getDisplayId());
-        mDismissingParallaxPolicy = new DismissingParallaxPolicy();
+        mDismissingEffectPolicy = new DismissingEffectPolicy(applyDismissingParallax);
 
         final Resources resources = context.getResources();
         mDividerWindowWidth = resources.getDimensionPixelSize(
@@ -247,7 +248,7 @@
         }
         DockedDividerUtils.sanitizeStackBounds(mBounds1, true /** topLeft */);
         DockedDividerUtils.sanitizeStackBounds(mBounds2, false /** topLeft */);
-        mDismissingParallaxPolicy.applyDividerPosition(position, isLandscape);
+        mDismissingEffectPolicy.applyDividerPosition(position, isLandscape);
     }
 
     /** Inflates {@link DividerView} on the root surface. */
@@ -290,7 +291,6 @@
      */
     void updateDivideBounds(int position) {
         updateBounds(position);
-        mSplitWindowManager.setResizingSplits(true);
         mSplitLayoutHandler.onLayoutSizeChanging(this);
     }
 
@@ -298,13 +298,11 @@
         mDividePosition = position;
         updateBounds(mDividePosition);
         mSplitLayoutHandler.onLayoutSizeChanged(this);
-        mSplitWindowManager.setResizingSplits(false);
     }
 
     /** Resets divider position. */
     public void resetDividerPosition() {
         mDividePosition = mDividerSnapAlgorithm.getMiddleTarget().position;
-        mSplitWindowManager.setResizingSplits(false);
         updateBounds(mDividePosition);
         mWinToken1 = null;
         mWinToken2 = null;
@@ -360,8 +358,8 @@
     @VisibleForTesting
     void flingDividePosition(int from, int to, @Nullable Runnable flingFinishedCallback) {
         if (from == to) {
-            // No animation run, it should stop resizing here.
-            mSplitWindowManager.setResizingSplits(false);
+            // No animation run, still callback to stop resizing.
+            mSplitLayoutHandler.onLayoutSizeChanged(this);
             return;
         }
         ValueAnimator animator = ValueAnimator
@@ -425,7 +423,7 @@
             return;
         }
 
-        mDismissingParallaxPolicy.adjustDismissingSurface(t, leash1, leash2, dimLayer1, dimLayer2);
+        mDismissingEffectPolicy.adjustDismissingSurface(t, leash1, leash2, dimLayer1, dimLayer2);
     }
 
     /** Apply recorded task layout to the {@link WindowContainerTransaction}. */
@@ -543,7 +541,10 @@
      * Calculates and applies proper dismissing parallax offset and dimming value to hint users
      * dismissing gesture.
      */
-    private class DismissingParallaxPolicy {
+    private class DismissingEffectPolicy {
+        /** Indicates whether to offset splitting bounds to hint dismissing progress or not. */
+        private final boolean mApplyParallax;
+
         // The current dismissing side.
         int mDismissingSide = DOCKED_INVALID;
 
@@ -553,6 +554,10 @@
         // The dimming value to hint the dismissing side and progress.
         float mDismissingDimValue = 0.0f;
 
+        DismissingEffectPolicy(boolean applyDismissingParallax) {
+            mApplyParallax = applyDismissingParallax;
+        }
+
         /**
          * Applies a parallax to the task to hint dismissing progress.
          *
@@ -627,12 +632,14 @@
                     return false;
             }
 
-            t.setPosition(targetLeash,
-                    mTempRect.left + mDismissingParallaxOffset.x,
-                    mTempRect.top + mDismissingParallaxOffset.y);
-            // Transform the screen-based split bounds to surface-based crop bounds.
-            mTempRect.offsetTo(-mDismissingParallaxOffset.x, -mDismissingParallaxOffset.y);
-            t.setWindowCrop(targetLeash, mTempRect);
+            if (mApplyParallax) {
+                t.setPosition(targetLeash,
+                        mTempRect.left + mDismissingParallaxOffset.x,
+                        mTempRect.top + mDismissingParallaxOffset.y);
+                // Transform the screen-based split bounds to surface-based crop bounds.
+                mTempRect.offsetTo(-mDismissingParallaxOffset.x, -mDismissingParallaxOffset.y);
+                t.setWindowCrop(targetLeash, mTempRect);
+            }
             t.setAlpha(targetDimLayer, mDismissingDimValue)
                     .setVisibility(targetDimLayer, mDismissingDimValue > 0.001f);
             return true;
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitWindowManager.java b/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitWindowManager.java
index 47dceb3..08754d3 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitWindowManager.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/common/split/SplitWindowManager.java
@@ -25,7 +25,6 @@
 import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_TRUSTED_OVERLAY;
 import static android.view.WindowManager.LayoutParams.TYPE_DOCK_DIVIDER;
 
-import android.app.ActivityTaskManager;
 import android.content.Context;
 import android.content.res.Configuration;
 import android.graphics.PixelFormat;
@@ -33,8 +32,6 @@
 import android.graphics.Region;
 import android.os.Binder;
 import android.os.IBinder;
-import android.os.RemoteException;
-import android.util.Slog;
 import android.view.IWindow;
 import android.view.InsetsState;
 import android.view.LayoutInflater;
@@ -59,7 +56,6 @@
     private Context mContext;
     private SurfaceControlViewHost mViewHost;
     private SurfaceControl mLeash;
-    private boolean mResizingSplits;
     private DividerView mDividerView;
 
     public interface ParentContainerCallbacks {
@@ -154,16 +150,6 @@
         mDividerView.setInteractive(interactive);
     }
 
-    void setResizingSplits(boolean resizing) {
-        if (resizing == mResizingSplits) return;
-        try {
-            ActivityTaskManager.getService().setSplitScreenResizing(resizing);
-            mResizingSplits = resizing;
-        } catch (RemoteException e) {
-            Slog.w(TAG, "Error calling setSplitScreenResizing", e);
-        }
-    }
-
     /**
      * Gets {@link SurfaceControl} of the surface holding divider view. @return {@code null} if not
      * feasible.
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/MainStage.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/MainStage.java
index a47a152..6440ef0 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/MainStage.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/MainStage.java
@@ -19,11 +19,13 @@
 import static android.app.WindowConfiguration.WINDOWING_MODE_MULTI_WINDOW;
 
 import android.annotation.Nullable;
+import android.content.Context;
 import android.graphics.Rect;
 import android.view.SurfaceSession;
 import android.window.WindowContainerToken;
 import android.window.WindowContainerTransaction;
 
+import com.android.launcher3.icons.IconProvider;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.common.SyncTransactionQueue;
 
@@ -37,11 +39,11 @@
 
     private boolean mIsActive = false;
 
-    MainStage(ShellTaskOrganizer taskOrganizer, int displayId,
+    MainStage(Context context, ShellTaskOrganizer taskOrganizer, int displayId,
             StageListenerCallbacks callbacks, SyncTransactionQueue syncQueue,
-            SurfaceSession surfaceSession,
+            SurfaceSession surfaceSession, IconProvider iconProvider,
             @Nullable StageTaskUnfoldController stageTaskUnfoldController) {
-        super(taskOrganizer, displayId, callbacks, syncQueue, surfaceSession,
+        super(context, taskOrganizer, displayId, callbacks, syncQueue, surfaceSession, iconProvider,
                 stageTaskUnfoldController);
     }
 
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/OutlineManager.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/OutlineManager.java
deleted file mode 100644
index a459c8d..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/OutlineManager.java
+++ /dev/null
@@ -1,181 +0,0 @@
-/*
- * Copyright (C) 2021 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.wm.shell.splitscreen;
-
-import static android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
-import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
-import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_NO_MOVE_ANIMATION;
-import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_TRUSTED_OVERLAY;
-import static android.view.WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
-
-import android.annotation.Nullable;
-import android.content.Context;
-import android.content.res.Configuration;
-import android.graphics.PixelFormat;
-import android.graphics.Rect;
-import android.os.Binder;
-import android.view.IWindow;
-import android.view.InsetsSource;
-import android.view.InsetsState;
-import android.view.LayoutInflater;
-import android.view.SurfaceControl;
-import android.view.SurfaceControlViewHost;
-import android.view.View;
-import android.view.ViewGroup;
-import android.view.WindowManager;
-import android.view.WindowlessWindowManager;
-import android.widget.FrameLayout;
-
-import com.android.wm.shell.R;
-
-/**
- * Handles drawing outline of the bounds of provided root surface. The outline will be drown with
- * the consideration of display insets like status bar, navigation bar and display cutout.
- */
-class OutlineManager extends WindowlessWindowManager {
-    private static final String WINDOW_NAME = "SplitOutlineLayer";
-    private final Context mContext;
-    private final Rect mRootBounds = new Rect();
-    private final Rect mTempRect = new Rect();
-    private final Rect mLastOutlineBounds = new Rect();
-    private final InsetsState mInsetsState = new InsetsState();
-    private final int mExpandedTaskBarHeight;
-    private OutlineView mOutlineView;
-    private SurfaceControlViewHost mViewHost;
-    private SurfaceControl mHostLeash;
-    private SurfaceControl mLeash;
-
-    OutlineManager(Context context, Configuration configuration) {
-        super(configuration, null /* rootSurface */, null /* hostInputToken */);
-        mContext = context.createWindowContext(context.getDisplay(), TYPE_APPLICATION_OVERLAY,
-                null /* options */);
-        mExpandedTaskBarHeight = mContext.getResources().getDimensionPixelSize(
-                com.android.internal.R.dimen.taskbar_frame_height);
-    }
-
-    @Override
-    protected void attachToParentSurface(IWindow window, SurfaceControl.Builder b) {
-        b.setParent(mHostLeash);
-    }
-
-    void inflate(SurfaceControl rootLeash, Rect rootBounds) {
-        if (mLeash != null || mViewHost != null) return;
-
-        mHostLeash = rootLeash;
-        mRootBounds.set(rootBounds);
-        mViewHost = new SurfaceControlViewHost(mContext, mContext.getDisplay(), this);
-
-        final FrameLayout rootLayout = (FrameLayout) LayoutInflater.from(mContext)
-                .inflate(R.layout.split_outline, null);
-        mOutlineView = rootLayout.findViewById(R.id.split_outline);
-
-        final WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
-                0 /* width */, 0 /* height */, TYPE_APPLICATION_OVERLAY,
-                FLAG_NOT_FOCUSABLE | FLAG_NOT_TOUCHABLE, PixelFormat.TRANSLUCENT);
-        lp.width = mRootBounds.width();
-        lp.height = mRootBounds.height();
-        lp.token = new Binder();
-        lp.setTitle(WINDOW_NAME);
-        lp.privateFlags |= PRIVATE_FLAG_NO_MOVE_ANIMATION | PRIVATE_FLAG_TRUSTED_OVERLAY;
-        // TODO(b/189839391): Set INPUT_FEATURE_NO_INPUT_CHANNEL after WM supports
-        //  TRUSTED_OVERLAY for windowless window without input channel.
-        mViewHost.setView(rootLayout, lp);
-        mLeash = getSurfaceControl(mViewHost.getWindowToken());
-
-        drawOutline();
-    }
-
-    void release() {
-        if (mViewHost != null) {
-            mViewHost.release();
-            mViewHost = null;
-        }
-        mRootBounds.setEmpty();
-        mLastOutlineBounds.setEmpty();
-        mOutlineView = null;
-        mHostLeash = null;
-        mLeash = null;
-    }
-
-    @Nullable
-    SurfaceControl getOutlineLeash() {
-        return mLeash;
-    }
-
-    void setVisibility(boolean visible) {
-        if (mOutlineView != null) {
-            mOutlineView.setVisibility(visible ? View.VISIBLE : View.INVISIBLE);
-        }
-    }
-
-    void setRootBounds(Rect rootBounds) {
-        if (mViewHost == null || mViewHost.getView() == null) {
-            return;
-        }
-
-        if (!mRootBounds.equals(rootBounds)) {
-            WindowManager.LayoutParams lp =
-                    (WindowManager.LayoutParams) mViewHost.getView().getLayoutParams();
-            lp.width = rootBounds.width();
-            lp.height = rootBounds.height();
-            mViewHost.relayout(lp);
-            mRootBounds.set(rootBounds);
-            drawOutline();
-        }
-    }
-
-    void onInsetsChanged(InsetsState insetsState) {
-        if (!mInsetsState.equals(insetsState)) {
-            mInsetsState.set(insetsState);
-            drawOutline();
-        }
-    }
-
-    private void computeOutlineBounds(Rect rootBounds, InsetsState insetsState, Rect outBounds) {
-        outBounds.set(rootBounds);
-        final InsetsSource taskBarInsetsSource =
-                insetsState.getSource(InsetsState.ITYPE_EXTRA_NAVIGATION_BAR);
-        // Only insets the divider bar with task bar when it's expanded so that the rounded corners
-        // will be drawn against task bar.
-        if (taskBarInsetsSource.getFrame().height() >= mExpandedTaskBarHeight) {
-            outBounds.inset(taskBarInsetsSource.calculateVisibleInsets(outBounds));
-        }
-
-        // Offset the coordinate from screen based to surface based.
-        outBounds.offset(-rootBounds.left, -rootBounds.top);
-    }
-
-    void drawOutline() {
-        if (mOutlineView == null) {
-            return;
-        }
-
-        computeOutlineBounds(mRootBounds, mInsetsState, mTempRect);
-        if (mTempRect.equals(mLastOutlineBounds)) {
-            return;
-        }
-
-        ViewGroup.MarginLayoutParams lp =
-                (ViewGroup.MarginLayoutParams) mOutlineView.getLayoutParams();
-        lp.leftMargin = mTempRect.left;
-        lp.topMargin = mTempRect.top;
-        lp.width = mTempRect.width();
-        lp.height = mTempRect.height();
-        mOutlineView.setLayoutParams(lp);
-        mLastOutlineBounds.set(mTempRect);
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/OutlineView.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/OutlineView.java
deleted file mode 100644
index 94dd9b2..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/OutlineView.java
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * Copyright (C) 2021 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.wm.shell.splitscreen;
-
-import static android.view.RoundedCorner.POSITION_BOTTOM_LEFT;
-import static android.view.RoundedCorner.POSITION_BOTTOM_RIGHT;
-import static android.view.RoundedCorner.POSITION_TOP_LEFT;
-import static android.view.RoundedCorner.POSITION_TOP_RIGHT;
-
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.Paint;
-import android.graphics.Path;
-import android.util.AttributeSet;
-import android.view.RoundedCorner;
-import android.view.View;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-
-import com.android.internal.R;
-
-/** View for drawing split outline. */
-public class OutlineView extends View {
-    private final Paint mPaint = new Paint();
-    private final Path mPath = new Path();
-    private final float[] mRadii = new float[8];
-
-    public OutlineView(@NonNull Context context, @Nullable AttributeSet attrs) {
-        super(context, attrs);
-        mPaint.setStyle(Paint.Style.STROKE);
-        mPaint.setStrokeWidth(
-                getResources().getDimension(R.dimen.accessibility_focus_highlight_stroke_width));
-        mPaint.setColor(getResources().getColor(R.color.system_accent1_100, null));
-    }
-
-    @Override
-    protected void onAttachedToWindow() {
-        // TODO(b/200850654): match the screen corners with the actual display decor.
-        mRadii[0] = mRadii[1] = getCornerRadius(POSITION_TOP_LEFT);
-        mRadii[2] = mRadii[3] = getCornerRadius(POSITION_TOP_RIGHT);
-        mRadii[4] = mRadii[5] = getCornerRadius(POSITION_BOTTOM_RIGHT);
-        mRadii[6] = mRadii[7] = getCornerRadius(POSITION_BOTTOM_LEFT);
-    }
-
-    private int getCornerRadius(@RoundedCorner.Position int position) {
-        final RoundedCorner roundedCorner = getDisplay().getRoundedCorner(position);
-        return roundedCorner == null ? 0 : roundedCorner.getRadius();
-    }
-
-    @Override
-    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
-        if (changed) {
-            mPath.reset();
-            mPath.addRoundRect(0, 0, getWidth(), getHeight(), mRadii, Path.Direction.CW);
-        }
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        canvas.drawPath(mPath, mPaint);
-    }
-
-    @Override
-    public boolean hasOverlappingRendering() {
-        return false;
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SideStage.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SideStage.java
index dc8fb9f..51104e4 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SideStage.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SideStage.java
@@ -16,20 +16,16 @@
 
 package com.android.wm.shell.splitscreen;
 
-import android.annotation.CallSuper;
 import android.annotation.Nullable;
 import android.app.ActivityManager;
 import android.content.Context;
 import android.graphics.Rect;
-import android.view.InsetsSourceControl;
-import android.view.InsetsState;
-import android.view.SurfaceControl;
 import android.view.SurfaceSession;
 import android.window.WindowContainerToken;
 import android.window.WindowContainerTransaction;
 
+import com.android.launcher3.icons.IconProvider;
 import com.android.wm.shell.ShellTaskOrganizer;
-import com.android.wm.shell.common.DisplayInsetsController;
 import com.android.wm.shell.common.SyncTransactionQueue;
 
 /**
@@ -38,19 +34,15 @@
  *
  * @see StageCoordinator
  */
-class SideStage extends StageTaskListener implements
-        DisplayInsetsController.OnInsetsChangedListener {
+class SideStage extends StageTaskListener {
     private static final String TAG = SideStage.class.getSimpleName();
-    private final Context mContext;
-    private OutlineManager mOutlineManager;
 
     SideStage(Context context, ShellTaskOrganizer taskOrganizer, int displayId,
             StageListenerCallbacks callbacks, SyncTransactionQueue syncQueue,
-            SurfaceSession surfaceSession,
+            SurfaceSession surfaceSession, IconProvider iconProvider,
             @Nullable StageTaskUnfoldController stageTaskUnfoldController) {
-        super(taskOrganizer, displayId, callbacks, syncQueue, surfaceSession,
+        super(context, taskOrganizer, displayId, callbacks, syncQueue, surfaceSession, iconProvider,
                 stageTaskUnfoldController);
-        mContext = context;
     }
 
     void addTask(ActivityManager.RunningTaskInfo task, Rect rootBounds,
@@ -83,62 +75,4 @@
         wct.reparent(task.token, newParent, false /* onTop */);
         return true;
     }
-
-    @Nullable
-    public SurfaceControl getOutlineLeash() {
-        return mOutlineManager.getOutlineLeash();
-    }
-
-    @Override
-    @CallSuper
-    public void onTaskAppeared(ActivityManager.RunningTaskInfo taskInfo, SurfaceControl leash) {
-        super.onTaskAppeared(taskInfo, leash);
-        if (isRootTask(taskInfo)) {
-            mOutlineManager = new OutlineManager(mContext, taskInfo.configuration);
-            enableOutline(true);
-        }
-    }
-
-    @Override
-    @CallSuper
-    public void onTaskInfoChanged(ActivityManager.RunningTaskInfo taskInfo) {
-        super.onTaskInfoChanged(taskInfo);
-        if (isRootTask(taskInfo)) {
-            mOutlineManager.setRootBounds(taskInfo.configuration.windowConfiguration.getBounds());
-        }
-    }
-
-    private boolean isRootTask(ActivityManager.RunningTaskInfo taskInfo) {
-        return mRootTaskInfo != null && mRootTaskInfo.taskId == taskInfo.taskId;
-    }
-
-    void enableOutline(boolean enable) {
-        if (mOutlineManager == null) {
-            return;
-        }
-
-        if (enable) {
-            if (mRootTaskInfo != null) {
-                mOutlineManager.inflate(mRootLeash,
-                        mRootTaskInfo.configuration.windowConfiguration.getBounds());
-            }
-        } else {
-            mOutlineManager.release();
-        }
-    }
-
-    void setOutlineVisibility(boolean visible) {
-        mOutlineManager.setVisibility(visible);
-    }
-
-    @Override
-    public void insetsChanged(InsetsState insetsState) {
-        mOutlineManager.onInsetsChanged(insetsState);
-    }
-
-    @Override
-    public void insetsControlChanged(InsetsState insetsState,
-            InsetsSourceControl[] activeControls) {
-        insetsChanged(insetsState);
-    }
 }
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SplitScreenController.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SplitScreenController.java
index 3b75bfb..36f1406 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SplitScreenController.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SplitScreenController.java
@@ -54,6 +54,7 @@
 
 import com.android.internal.logging.InstanceId;
 import com.android.internal.util.FrameworkStatsLog;
+import com.android.launcher3.icons.IconProvider;
 import com.android.wm.shell.RootTaskDisplayAreaOrganizer;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.common.DisplayImeController;
@@ -78,6 +79,7 @@
 /**
  * Class manages split-screen multitasking mode and implements the main interface
  * {@link SplitScreen}.
+ *
  * @see StageCoordinator
  */
 // TODO(b/198577848): Implement split screen flicker test to consolidate CUJ of split screen.
@@ -96,6 +98,7 @@
     private final Transitions mTransitions;
     private final TransactionPool mTransactionPool;
     private final SplitscreenEventLogger mLogger;
+    private final IconProvider mIconProvider;
     private final Provider<Optional<StageTaskUnfoldController>> mUnfoldControllerProvider;
 
     private StageCoordinator mStageCoordinator;
@@ -105,7 +108,7 @@
             RootTaskDisplayAreaOrganizer rootTDAOrganizer,
             ShellExecutor mainExecutor, DisplayImeController displayImeController,
             DisplayInsetsController displayInsetsController,
-            Transitions transitions, TransactionPool transactionPool,
+            Transitions transitions, TransactionPool transactionPool, IconProvider iconProvider,
             Provider<Optional<StageTaskUnfoldController>> unfoldControllerProvider) {
         mTaskOrganizer = shellTaskOrganizer;
         mSyncQueue = syncQueue;
@@ -118,6 +121,7 @@
         mTransactionPool = transactionPool;
         mUnfoldControllerProvider = unfoldControllerProvider;
         mLogger = new SplitscreenEventLogger();
+        mIconProvider = iconProvider;
     }
 
     public SplitScreen asSplitScreen() {
@@ -140,7 +144,7 @@
             mStageCoordinator = new StageCoordinator(mContext, DEFAULT_DISPLAY, mSyncQueue,
                     mRootTDAOrganizer, mTaskOrganizer, mDisplayImeController,
                     mDisplayInsetsController, mTransitions, mTransactionPool, mLogger,
-                    mUnfoldControllerProvider);
+                    mIconProvider, mUnfoldControllerProvider);
         }
     }
 
@@ -165,10 +169,6 @@
         return mStageCoordinator.removeFromSideStage(taskId);
     }
 
-    public void setSideStageOutline(boolean enable) {
-        mStageCoordinator.setSideStageOutline(enable);
-    }
-
     public void setSideStagePosition(@SplitPosition int sideStagePosition) {
         mStageCoordinator.setSideStagePosition(sideStagePosition, null /* wct */);
     }
@@ -319,9 +319,7 @@
         }
         transaction.apply();
         transaction.close();
-        return new RemoteAnimationTarget[]{
-                mStageCoordinator.getDividerBarLegacyTarget(),
-                mStageCoordinator.getOutlineLegacyTarget()};
+        return new RemoteAnimationTarget[]{mStageCoordinator.getDividerBarLegacyTarget()};
     }
 
     /**
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageCoordinator.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageCoordinator.java
index 72d9880..3b62afc 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageCoordinator.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageCoordinator.java
@@ -80,6 +80,7 @@
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.logging.InstanceId;
 import com.android.internal.protolog.common.ProtoLog;
+import com.android.launcher3.icons.IconProvider;
 import com.android.wm.shell.RootTaskDisplayAreaOrganizer;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.common.DisplayImeController;
@@ -151,10 +152,12 @@
     /** Whether the device is supporting legacy split or not. */
     private boolean mUseLegacySplit;
 
-    @SplitScreen.StageType private int mDismissTop = NO_DISMISS;
+    @SplitScreen.StageType
+    private int mDismissTop = NO_DISMISS;
 
     /** The target stage to dismiss to when unlock after folded. */
-    @SplitScreen.StageType private int mTopStageAfterFoldDismiss = STAGE_TYPE_UNDEFINED;
+    @SplitScreen.StageType
+    private int mTopStageAfterFoldDismiss = STAGE_TYPE_UNDEFINED;
 
     private final Runnable mOnTransitionAnimationComplete = () -> {
         // If still playing, let it finish.
@@ -169,22 +172,23 @@
 
     private final SplitWindowManager.ParentContainerCallbacks mParentContainerCallbacks =
             new SplitWindowManager.ParentContainerCallbacks() {
-        @Override
-        public void attachToParentSurface(SurfaceControl.Builder b) {
-            mRootTDAOrganizer.attachToDisplayArea(mDisplayId, b);
-        }
+                @Override
+                public void attachToParentSurface(SurfaceControl.Builder b) {
+                    mRootTDAOrganizer.attachToDisplayArea(mDisplayId, b);
+                }
 
-        @Override
-        public void onLeashReady(SurfaceControl leash) {
-            mSyncQueue.runInSync(t -> applyDividerVisibility(t));
-        }
-    };
+                @Override
+                public void onLeashReady(SurfaceControl leash) {
+                    mSyncQueue.runInSync(t -> applyDividerVisibility(t));
+                }
+            };
 
     StageCoordinator(Context context, int displayId, SyncTransactionQueue syncQueue,
             RootTaskDisplayAreaOrganizer rootTDAOrganizer, ShellTaskOrganizer taskOrganizer,
             DisplayImeController displayImeController,
             DisplayInsetsController displayInsetsController, Transitions transitions,
             TransactionPool transactionPool, SplitscreenEventLogger logger,
+            IconProvider iconProvider,
             Provider<Optional<StageTaskUnfoldController>> unfoldControllerProvider) {
         mContext = context;
         mDisplayId = displayId;
@@ -196,11 +200,13 @@
         mSideUnfoldController = unfoldControllerProvider.get().orElse(null);
 
         mMainStage = new MainStage(
+                mContext,
                 mTaskOrganizer,
                 mDisplayId,
                 mMainStageListener,
                 mSyncQueue,
                 mSurfaceSession,
+                iconProvider,
                 mMainUnfoldController);
         mSideStage = new SideStage(
                 mContext,
@@ -209,10 +215,10 @@
                 mSideStageListener,
                 mSyncQueue,
                 mSurfaceSession,
+                iconProvider,
                 mSideUnfoldController);
         mDisplayImeController = displayImeController;
         mDisplayInsetsController = displayInsetsController;
-        mDisplayInsetsController.addInsetsChangedListener(mDisplayId, mSideStage);
         mRootTDAOrganizer.registerListener(displayId, this);
         final DeviceStateManager deviceStateManager =
                 mContext.getSystemService(DeviceStateManager.class);
@@ -284,10 +290,6 @@
         return result;
     }
 
-    void setSideStageOutline(boolean enable) {
-        mSideStage.enableOutline(enable);
-    }
-
     /** Starts 2 tasks in one transition. */
     void startTasks(int mainTaskId, @Nullable Bundle mainOptions, int sideTaskId,
             @Nullable Bundle sideOptions, @SplitPosition int sidePosition,
@@ -697,9 +699,10 @@
 
         if (bothStageInvisible) {
             if (mExitSplitScreenOnHide
-            // Don't dismiss staged split when both stages are not visible due to sleeping display,
-            // like the cases keyguard showing or screen off.
-            || (!mMainStage.mRootTaskInfo.isSleeping && !mSideStage.mRootTaskInfo.isSleeping)) {
+                    // Don't dismiss staged split when both stages are not visible due to sleeping
+                    // display, like the cases keyguard showing or screen off.
+                    || (!mMainStage.mRootTaskInfo.isSleeping
+                    && !mSideStage.mRootTaskInfo.isSleeping)) {
                 exitSplitScreen(null /* childrenToTop */,
                         SPLITSCREEN_UICHANGED__EXIT_REASON__RETURN_HOME);
             }
@@ -719,7 +722,6 @@
                 t.setVisibility(mSideStage.mRootLeash, bothStageVisible)
                         .setVisibility(mMainStage.mRootLeash, bothStageVisible);
                 applyDividerVisibility(t);
-                applyOutlineVisibility(t);
             }
         });
     }
@@ -741,19 +743,6 @@
         }
     }
 
-    private void applyOutlineVisibility(SurfaceControl.Transaction t) {
-        final SurfaceControl outlineLeash = mSideStage.getOutlineLeash();
-        if (outlineLeash == null) {
-            return;
-        }
-
-        if (mDividerVisible) {
-            t.show(outlineLeash).setLayer(outlineLeash, SPLIT_DIVIDER_LAYER);
-        } else {
-            t.hide(outlineLeash);
-        }
-    }
-
     private void onStageHasChildrenChanged(StageListenerImpl stageListener) {
         final boolean hasChildren = stageListener.mHasChildren;
         final boolean isSideStage = stageListener == mSideStageListener;
@@ -817,8 +806,11 @@
 
     @Override
     public void onLayoutSizeChanging(SplitLayout layout) {
-        mSyncQueue.runInSync(t -> updateSurfaceBounds(layout, t));
-        mSideStage.setOutlineVisibility(false);
+        mSyncQueue.runInSync(t -> {
+            updateSurfaceBounds(layout, t);
+            mMainStage.onResizing(getMainStageBounds(), t);
+            mSideStage.onResizing(getSideStageBounds(), t);
+        });
     }
 
     @Override
@@ -827,8 +819,11 @@
         updateWindowBounds(layout, wct);
         updateUnfoldBounds();
         mSyncQueue.queue(wct);
-        mSyncQueue.runInSync(t -> updateSurfaceBounds(layout, t));
-        mSideStage.setOutlineVisibility(true);
+        mSyncQueue.runInSync(t -> {
+            updateSurfaceBounds(layout, t);
+            mMainStage.onResized(getMainStageBounds(), t);
+            mSideStage.onResized(getSideStageBounds(), t);
+        });
         mLogger.logResize(mSplitLayout.getDividerPositionAsFraction());
     }
 
@@ -893,7 +888,7 @@
         if (mSplitLayout == null) {
             mSplitLayout = new SplitLayout(TAG + "SplitDivider", mContext,
                     mDisplayAreaInfo.configuration, this, mParentContainerCallbacks,
-                    mDisplayImeController, mTaskOrganizer);
+                    mDisplayImeController, mTaskOrganizer, false /* applyDismissingParallax */);
             mDisplayInsetsController.addInsetsChangedListener(mDisplayId, mSplitLayout);
 
             if (mMainUnfoldController != null && mSideUnfoldController != null) {
@@ -1216,18 +1211,6 @@
                 null /* taskInfo */, false /* allowEnterPip */, TYPE_DOCK_DIVIDER);
     }
 
-    RemoteAnimationTarget getOutlineLegacyTarget() {
-        final Rect bounds = mSideStage.mRootTaskInfo.configuration.windowConfiguration.getBounds();
-        // Leverage TYPE_DOCK_DIVIDER type when wrapping outline remote animation target in order to
-        // distinguish as a split auxiliary target in Launcher.
-        return new RemoteAnimationTarget(-1 /* taskId */, -1 /* mode */,
-                mSideStage.getOutlineLeash(), false /* isTranslucent */, null /* clipRect */,
-                null /* contentInsets */, Integer.MAX_VALUE /* prefixOrderIndex */,
-                new android.graphics.Point(0, 0) /* position */, bounds, bounds,
-                new WindowConfiguration(), true, null /* startLeash */, null /* startBounds */,
-                null /* taskInfo */, false /* allowEnterPip */, TYPE_DOCK_DIVIDER);
-    }
-
     @Override
     public void dump(@NonNull PrintWriter pw, String prefix) {
         final String innerPrefix = prefix + "  ";
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java
index 6f1a09d..5100c56 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java
@@ -26,6 +26,7 @@
 import android.annotation.CallSuper;
 import android.annotation.Nullable;
 import android.app.ActivityManager;
+import android.content.Context;
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.util.SparseArray;
@@ -35,9 +36,11 @@
 
 import androidx.annotation.NonNull;
 
+import com.android.launcher3.icons.IconProvider;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.common.SurfaceUtils;
 import com.android.wm.shell.common.SyncTransactionQueue;
+import com.android.wm.shell.common.split.SplitDecorManager;
 
 import java.io.PrintWriter;
 
@@ -72,25 +75,31 @@
         void onNoLongerSupportMultiWindow();
     }
 
+    private final Context mContext;
     private final StageListenerCallbacks mCallbacks;
     private final SurfaceSession mSurfaceSession;
-    protected final SyncTransactionQueue mSyncQueue;
+    private final SyncTransactionQueue mSyncQueue;
+    private final IconProvider mIconProvider;
 
     protected ActivityManager.RunningTaskInfo mRootTaskInfo;
     protected SurfaceControl mRootLeash;
     protected SurfaceControl mDimLayer;
     protected SparseArray<ActivityManager.RunningTaskInfo> mChildrenTaskInfo = new SparseArray<>();
     private final SparseArray<SurfaceControl> mChildrenLeashes = new SparseArray<>();
+    // TODO(b/204308910): Extracts SplitDecorManager related code to common package.
+    private SplitDecorManager mSplitDecorManager;
 
     private final StageTaskUnfoldController mStageTaskUnfoldController;
 
-    StageTaskListener(ShellTaskOrganizer taskOrganizer, int displayId,
+    StageTaskListener(Context context, ShellTaskOrganizer taskOrganizer, int displayId,
             StageListenerCallbacks callbacks, SyncTransactionQueue syncQueue,
-            SurfaceSession surfaceSession,
+            SurfaceSession surfaceSession, IconProvider iconProvider,
             @Nullable StageTaskUnfoldController stageTaskUnfoldController) {
+        mContext = context;
         mCallbacks = callbacks;
         mSyncQueue = syncQueue;
         mSurfaceSession = surfaceSession;
+        mIconProvider = iconProvider;
         mStageTaskUnfoldController = stageTaskUnfoldController;
         taskOrganizer.createRootTask(displayId, WINDOWING_MODE_MULTI_WINDOW, this);
     }
@@ -142,13 +151,14 @@
         if (mRootTaskInfo == null && !taskInfo.hasParentTask()) {
             mRootLeash = leash;
             mRootTaskInfo = taskInfo;
+            mSplitDecorManager = new SplitDecorManager(
+                    mRootTaskInfo.configuration,
+                    mIconProvider,
+                    mSurfaceSession);
             mCallbacks.onRootTaskAppeared();
             sendStatusChanged();
-            mSyncQueue.runInSync(t -> {
-                t.hide(mRootLeash);
-                mDimLayer =
-                        SurfaceUtils.makeDimLayer(t, mRootLeash, "Dim layer", mSurfaceSession);
-            });
+            mSyncQueue.runInSync(t -> mDimLayer =
+                    SurfaceUtils.makeDimLayer(t, mRootLeash, "Dim layer", mSurfaceSession));
         } else if (taskInfo.parentTaskId == mRootTaskInfo.taskId) {
             final int taskId = taskInfo.taskId;
             mChildrenLeashes.put(taskId, leash);
@@ -179,6 +189,17 @@
             return;
         }
         if (mRootTaskInfo.taskId == taskInfo.taskId) {
+            // Inflates split decor view only when the root task is visible.
+            if (mRootTaskInfo.isVisible != taskInfo.isVisible) {
+                mSyncQueue.runInSync(t -> {
+                    if (taskInfo.isVisible) {
+                        mSplitDecorManager.inflate(mContext, mRootLeash,
+                                taskInfo.configuration.windowConfiguration.getBounds());
+                    } else {
+                        mSplitDecorManager.release(t);
+                    }
+                });
+            }
             mRootTaskInfo = taskInfo;
         } else if (taskInfo.parentTaskId == mRootTaskInfo.taskId) {
             mChildrenTaskInfo.put(taskInfo.taskId, taskInfo);
@@ -205,8 +226,11 @@
         final int taskId = taskInfo.taskId;
         if (mRootTaskInfo.taskId == taskId) {
             mCallbacks.onRootTaskVanished();
-            mSyncQueue.runInSync(t -> t.remove(mDimLayer));
             mRootTaskInfo = null;
+            mSyncQueue.runInSync(t -> {
+                t.remove(mDimLayer);
+                mSplitDecorManager.release(t);
+            });
         } else if (mChildrenTaskInfo.contains(taskId)) {
             mChildrenTaskInfo.remove(taskId);
             mChildrenLeashes.remove(taskId);
@@ -237,6 +261,18 @@
         }
     }
 
+    void onResizing(Rect newBounds, SurfaceControl.Transaction t) {
+        if (mSplitDecorManager != null && mRootTaskInfo != null) {
+            mSplitDecorManager.onResizing(mRootTaskInfo, newBounds, t);
+        }
+    }
+
+    void onResized(Rect newBounds, SurfaceControl.Transaction t) {
+        if (mSplitDecorManager != null) {
+            mSplitDecorManager.onResized(newBounds, t);
+        }
+    }
+
     void setBounds(Rect bounds, WindowContainerTransaction wct) {
         wct.setBounds(mRootTaskInfo.token, bounds);
     }
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageCoordinator.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageCoordinator.java
index 574e379..60a6cd7 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageCoordinator.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageCoordinator.java
@@ -882,7 +882,7 @@
         if (mSplitLayout == null) {
             mSplitLayout = new SplitLayout(TAG + "SplitDivider", mContext,
                     mDisplayAreaInfo.configuration, this, mParentContainerCallbacks,
-                    mDisplayImeController, mTaskOrganizer);
+                    mDisplayImeController, mTaskOrganizer, true /* applyDismissingParallax */);
             mDisplayInsetsController.addInsetsChangedListener(mDisplayId, mSplitLayout);
 
             if (mMainUnfoldController != null && mSideUnfoldController != null) {
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/common/split/SplitLayoutTests.java b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/common/split/SplitLayoutTests.java
index b4caeb5..73eebad 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/common/split/SplitLayoutTests.java
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/common/split/SplitLayoutTests.java
@@ -68,7 +68,8 @@
                 mSplitLayoutHandler,
                 mCallbacks,
                 mDisplayImeController,
-                mTaskOrganizer));
+                mTaskOrganizer,
+                false /* applyDismissingParallax */));
     }
 
     @Test
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/MainStageTests.java b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/MainStageTests.java
index 2bcc45e..c972067 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/MainStageTests.java
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/MainStageTests.java
@@ -25,10 +25,13 @@
 import android.view.SurfaceSession;
 import android.window.WindowContainerTransaction;
 
+import androidx.test.annotation.UiThreadTest;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.SmallTest;
 
+import com.android.launcher3.icons.IconProvider;
 import com.android.wm.shell.ShellTaskOrganizer;
+import com.android.wm.shell.ShellTestCase;
 import com.android.wm.shell.TestRunningTaskInfoBuilder;
 import com.android.wm.shell.common.SyncTransactionQueue;
 
@@ -41,22 +44,24 @@
 /** Tests for {@link MainStage} */
 @SmallTest
 @RunWith(AndroidJUnit4.class)
-public class MainStageTests {
+public class MainStageTests extends ShellTestCase {
     @Mock private ShellTaskOrganizer mTaskOrganizer;
     @Mock private StageTaskListener.StageListenerCallbacks mCallbacks;
     @Mock private SyncTransactionQueue mSyncQueue;
     @Mock private ActivityManager.RunningTaskInfo mRootTaskInfo;
     @Mock private SurfaceControl mRootLeash;
+    @Mock private IconProvider mIconProvider;
     private WindowContainerTransaction mWct = new WindowContainerTransaction();
     private SurfaceSession mSurfaceSession = new SurfaceSession();
     private MainStage mMainStage;
 
     @Before
+    @UiThreadTest
     public void setup() {
         MockitoAnnotations.initMocks(this);
         mRootTaskInfo = new TestRunningTaskInfoBuilder().build();
-        mMainStage = new MainStage(mTaskOrganizer, DEFAULT_DISPLAY, mCallbacks, mSyncQueue,
-                mSurfaceSession, null);
+        mMainStage = new MainStage(mContext, mTaskOrganizer, DEFAULT_DISPLAY, mCallbacks,
+                mSyncQueue, mSurfaceSession, mIconProvider, null);
         mMainStage.onTaskAppeared(mRootTaskInfo, mRootLeash);
     }
 
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/SideStageTests.java b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/SideStageTests.java
index 838aa81..1857faa 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/SideStageTests.java
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/SideStageTests.java
@@ -33,6 +33,7 @@
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.SmallTest;
 
+import com.android.launcher3.icons.IconProvider;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.ShellTestCase;
 import com.android.wm.shell.TestRunningTaskInfoBuilder;
@@ -54,6 +55,7 @@
     @Mock private SyncTransactionQueue mSyncQueue;
     @Mock private ActivityManager.RunningTaskInfo mRootTask;
     @Mock private SurfaceControl mRootLeash;
+    @Mock private IconProvider mIconProvider;
     @Spy private WindowContainerTransaction mWct;
     private SurfaceSession mSurfaceSession = new SurfaceSession();
     private SideStage mSideStage;
@@ -64,7 +66,7 @@
         MockitoAnnotations.initMocks(this);
         mRootTask = new TestRunningTaskInfoBuilder().build();
         mSideStage = new SideStage(mContext, mTaskOrganizer, DEFAULT_DISPLAY, mCallbacks,
-                mSyncQueue, mSurfaceSession, null);
+                mSyncQueue, mSurfaceSession, mIconProvider, null);
         mSideStage.onTaskAppeared(mRootTask, mRootLeash);
     }
 
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/SplitTransitionTests.java b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/SplitTransitionTests.java
index 05496b0..d5dee82 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/SplitTransitionTests.java
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/SplitTransitionTests.java
@@ -55,6 +55,7 @@
 import androidx.test.filters.SmallTest;
 import androidx.test.runner.AndroidJUnit4;
 
+import com.android.launcher3.icons.IconProvider;
 import com.android.wm.shell.RootTaskDisplayAreaOrganizer;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.ShellTestCase;
@@ -89,6 +90,7 @@
     @Mock private Transitions mTransitions;
     @Mock private SurfaceSession mSurfaceSession;
     @Mock private SplitscreenEventLogger mLogger;
+    @Mock private IconProvider mIconProvider;
     private SplitLayout mSplitLayout;
     private MainStage mMainStage;
     private SideStage mSideStage;
@@ -107,11 +109,13 @@
         doReturn(mockExecutor).when(mTransitions).getAnimExecutor();
         doReturn(mock(SurfaceControl.Transaction.class)).when(mTransactionPool).acquire();
         mSplitLayout = SplitTestUtils.createMockSplitLayout();
-        mMainStage = new MainStage(mTaskOrganizer, DEFAULT_DISPLAY, mock(
-                StageTaskListener.StageListenerCallbacks.class), mSyncQueue, mSurfaceSession, null);
+        mMainStage = new MainStage(mContext, mTaskOrganizer, DEFAULT_DISPLAY, mock(
+                StageTaskListener.StageListenerCallbacks.class), mSyncQueue, mSurfaceSession,
+                mIconProvider, null);
         mMainStage.onTaskAppeared(new TestRunningTaskInfoBuilder().build(), createMockSurface());
         mSideStage = new SideStage(mContext, mTaskOrganizer, DEFAULT_DISPLAY, mock(
-                StageTaskListener.StageListenerCallbacks.class), mSyncQueue, mSurfaceSession, null);
+                StageTaskListener.StageListenerCallbacks.class), mSyncQueue, mSurfaceSession,
+                mIconProvider, null);
         mSideStage.onTaskAppeared(new TestRunningTaskInfoBuilder().build(), createMockSurface());
         mStageCoordinator = new SplitTestUtils.TestStageCoordinator(mContext, DEFAULT_DISPLAY,
                 mSyncQueue, mRootTDAOrganizer, mTaskOrganizer, mMainStage, mSideStage,
diff --git a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/StageTaskListenerTests.java b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/StageTaskListenerTests.java
index 3ed72e2..53d5076 100644
--- a/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/StageTaskListenerTests.java
+++ b/libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/splitscreen/StageTaskListenerTests.java
@@ -35,10 +35,13 @@
 import android.view.SurfaceSession;
 import android.window.WindowContainerTransaction;
 
+import androidx.test.annotation.UiThreadTest;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.SmallTest;
 
+import com.android.launcher3.icons.IconProvider;
 import com.android.wm.shell.ShellTaskOrganizer;
+import com.android.wm.shell.ShellTestCase;
 import com.android.wm.shell.TestRunningTaskInfoBuilder;
 import com.android.wm.shell.common.SyncTransactionQueue;
 
@@ -57,7 +60,7 @@
  */
 @SmallTest
 @RunWith(AndroidJUnit4.class)
-public final class StageTaskListenerTests {
+public final class StageTaskListenerTests extends ShellTestCase {
     private static final boolean ENABLE_SHELL_TRANSITIONS =
             SystemProperties.getBoolean("persist.debug.shell_transit", false);
 
@@ -68,6 +71,8 @@
     @Mock
     private SyncTransactionQueue mSyncQueue;
     @Mock
+    private IconProvider mIconProvider;
+    @Mock
     private StageTaskUnfoldController mStageTaskUnfoldController;
     @Captor
     private ArgumentCaptor<SyncTransactionQueue.TransactionRunnable> mRunnableCaptor;
@@ -77,14 +82,17 @@
     private StageTaskListener mStageTaskListener;
 
     @Before
+    @UiThreadTest
     public void setup() {
         MockitoAnnotations.initMocks(this);
         mStageTaskListener = new StageTaskListener(
+                mContext,
                 mTaskOrganizer,
                 DEFAULT_DISPLAY,
                 mCallbacks,
                 mSyncQueue,
                 mSurfaceSession,
+                mIconProvider,
                 mStageTaskUnfoldController);
         mRootTask = new TestRunningTaskInfoBuilder().build();
         mRootTask.parentTaskId = INVALID_TASK_ID;
diff --git a/packages/SystemUI/src/com/android/systemui/wmshell/WMShellBaseModule.java b/packages/SystemUI/src/com/android/systemui/wmshell/WMShellBaseModule.java
index fd9783a..0a33930 100644
--- a/packages/SystemUI/src/com/android/systemui/wmshell/WMShellBaseModule.java
+++ b/packages/SystemUI/src/com/android/systemui/wmshell/WMShellBaseModule.java
@@ -463,13 +463,13 @@
             @ShellMainThread ShellExecutor mainExecutor,
             DisplayImeController displayImeController,
             DisplayInsetsController displayInsetsController, Transitions transitions,
-            TransactionPool transactionPool,
+            TransactionPool transactionPool, IconProvider iconProvider,
             Provider<Optional<StageTaskUnfoldController>> stageTaskUnfoldControllerProvider) {
         if (ActivityTaskManager.supportsSplitScreenMultiWindow(context)) {
             return Optional.of(new SplitScreenController(shellTaskOrganizer, syncQueue, context,
                     rootTaskDisplayAreaOrganizer, mainExecutor, displayImeController,
-                    displayInsetsController, transitions,
-                    transactionPool, stageTaskUnfoldControllerProvider));
+                    displayInsetsController, transitions, transactionPool, iconProvider,
+                    stageTaskUnfoldControllerProvider));
         } else {
             return Optional.empty();
         }