diff --git a/quickstep/src/com/android/launcher3/taskbar/FallbackTaskbarUIController.java b/quickstep/src/com/android/launcher3/taskbar/FallbackTaskbarUIController.java
index 929e793..e3bcb0d 100644
--- a/quickstep/src/com/android/launcher3/taskbar/FallbackTaskbarUIController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/FallbackTaskbarUIController.java
@@ -25,20 +25,24 @@
 
 import com.android.launcher3.popup.SystemShortcut;
 import com.android.launcher3.statemanager.StateManager;
-import com.android.quickstep.RecentsActivity;
+import com.android.launcher3.statemanager.StatefulContainer;
 import com.android.quickstep.TopTaskTracker;
 import com.android.quickstep.fallback.RecentsState;
 import com.android.quickstep.util.TISBindHelper;
 import com.android.quickstep.views.RecentsView;
+import com.android.quickstep.views.RecentsViewContainer;
 
 import java.util.stream.Stream;
 
 /**
  * A data source which integrates with the fallback RecentsActivity instance (for 3P launchers).
+ * @param <T> The type of the RecentsViewContainer that will handle Recents state changes.
  */
-public class FallbackTaskbarUIController extends TaskbarUIController {
+public class FallbackTaskbarUIController
+        <T extends RecentsViewContainer & StatefulContainer<RecentsState>>
+        extends TaskbarUIController {
 
-    private final RecentsActivity mRecentsActivity;
+    private final T mRecentsContainer;
 
     private final StateManager.StateListener<RecentsState> mStateListener =
             new StateManager.StateListener<RecentsState>() {
@@ -63,23 +67,23 @@
                 }
             };
 
-    public FallbackTaskbarUIController(RecentsActivity recentsActivity) {
-        mRecentsActivity = recentsActivity;
+    public FallbackTaskbarUIController(T recentsContainer) {
+        mRecentsContainer = recentsContainer;
     }
 
     @Override
     protected void init(TaskbarControllers taskbarControllers) {
         super.init(taskbarControllers);
-        mRecentsActivity.setTaskbarUIController(this);
-        mRecentsActivity.getStateManager().addStateListener(mStateListener);
+        mRecentsContainer.setTaskbarUIController(this);
+        mRecentsContainer.getStateManager().addStateListener(mStateListener);
     }
 
     @Override
     protected void onDestroy() {
         super.onDestroy();
         getRecentsView().setTaskLaunchListener(null);
-        mRecentsActivity.setTaskbarUIController(null);
-        mRecentsActivity.getStateManager().removeStateListener(mStateListener);
+        mRecentsContainer.setTaskbarUIController(null);
+        mRecentsContainer.getStateManager().removeStateListener(mStateListener);
     }
 
     /**
@@ -109,7 +113,7 @@
 
     @Override
     public RecentsView getRecentsView() {
-        return mRecentsActivity.getOverviewPanel();
+        return mRecentsContainer.getOverviewPanel();
     }
 
     @Override
@@ -131,11 +135,11 @@
     @Nullable
     @Override
     protected TISBindHelper getTISBindHelper() {
-        return mRecentsActivity.getTISBindHelper();
+        return mRecentsContainer.getTISBindHelper();
     }
 
     @Override
     protected String getTaskbarUIControllerName() {
-        return "FallbackTaskbarUIController";
+        return "FallbackTaskbarUIController<" + mRecentsContainer.getClass().getSimpleName() + ">";
     }
 }
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarManager.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarManager.java
index a0440c1..ab4b1b6 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarManager.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarManager.java
@@ -71,7 +71,9 @@
 import com.android.quickstep.AllAppsActionManager;
 import com.android.quickstep.RecentsActivity;
 import com.android.quickstep.SystemUiProxy;
+import com.android.quickstep.fallback.window.RecentsWindowManager;
 import com.android.quickstep.util.ContextualSearchInvoker;
+import com.android.quickstep.views.RecentsViewContainer;
 import com.android.systemui.shared.statusbar.phone.BarTransitions;
 import com.android.systemui.shared.system.QuickStepContract;
 import com.android.systemui.shared.system.QuickStepContract.SystemUiStateFlags;
@@ -130,6 +132,8 @@
 
     private TaskbarActivityContext mTaskbarActivityContext;
     private StatefulActivity mActivity;
+    private RecentsViewContainer mRecentsViewContainer;
+
     /**
      * Cache a copy here so we can initialize state whenever taskbar is recreated, since
      * this class does not get re-initialized w/ new taskbars.
@@ -403,9 +407,28 @@
         }
         mUnfoldProgressProvider.setSourceProvider(unfoldTransitionProgressProvider);
 
+        if (activity instanceof RecentsViewContainer recentsViewContainer) {
+            setRecentsViewContainer(recentsViewContainer);
+        }
+    }
+
+    /**
+     * Sets the current RecentsViewContainer, from which we create a TaskbarUIController.
+     */
+    public void setRecentsViewContainer(@NonNull RecentsViewContainer recentsViewContainer) {
+        if (mRecentsViewContainer == recentsViewContainer) {
+            return;
+        }
+        if (mRecentsViewContainer == mActivity) {
+            // When switching to RecentsWindowManager (not an Activity), the old mActivity is not
+            // destroyed, nor is there a new Activity to replace it. Thus if we don't clear it here,
+            // it will not get re-set properly if we return to the Activity (e.g. NexusLauncher).
+            mActivityOnDestroyCallback.run();
+        }
+        mRecentsViewContainer = recentsViewContainer;
         if (mTaskbarActivityContext != null) {
             mTaskbarActivityContext.setUIController(
-                    createTaskbarUIControllerForActivity(mActivity));
+                    createTaskbarUIControllerForRecentsViewContainer(mRecentsViewContainer));
         }
     }
 
@@ -428,12 +451,18 @@
     /**
      * Creates a {@link TaskbarUIController} to use while the given StatefulActivity is active.
      */
-    private TaskbarUIController createTaskbarUIControllerForActivity(StatefulActivity activity) {
-        if (activity instanceof QuickstepLauncher) {
-            return new LauncherTaskbarUIController((QuickstepLauncher) activity);
+    private TaskbarUIController createTaskbarUIControllerForRecentsViewContainer(
+            RecentsViewContainer container) {
+        if (container instanceof QuickstepLauncher quickstepLauncher) {
+            return new LauncherTaskbarUIController(quickstepLauncher);
         }
-        if (activity instanceof RecentsActivity) {
-            return new FallbackTaskbarUIController((RecentsActivity) activity);
+        // If a 3P Launcher is default, always use FallbackTaskbarUIController regardless of
+        // whether the recents container is RecentsActivity or RecentsWindowManager.
+        if (container instanceof RecentsActivity recentsActivity) {
+            return new FallbackTaskbarUIController<>(recentsActivity);
+        }
+        if (container instanceof RecentsWindowManager recentsWindowManager) {
+            return new FallbackTaskbarUIController<>(recentsWindowManager);
         }
         return TaskbarUIController.DEFAULT;
     }
@@ -481,9 +510,9 @@
             mSharedState.allAppsVisible = mSharedState.allAppsVisible && isLargeScreenTaskbar;
             mTaskbarActivityContext.init(mSharedState);
 
-            if (mActivity != null) {
+            if (mRecentsViewContainer != null) {
                 mTaskbarActivityContext.setUIController(
-                    createTaskbarUIControllerForActivity(mActivity));
+                        createTaskbarUIControllerForRecentsViewContainer(mRecentsViewContainer));
             }
 
             if (enableTaskbarNoRecreate()) {
diff --git a/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java b/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
index 228dc91..fe68ebc 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java
@@ -139,6 +139,7 @@
 import com.android.launcher3.statemanager.StateManager.StateHandler;
 import com.android.launcher3.taskbar.LauncherTaskbarUIController;
 import com.android.launcher3.taskbar.TaskbarManager;
+import com.android.launcher3.taskbar.TaskbarUIController;
 import com.android.launcher3.testing.TestLogging;
 import com.android.launcher3.testing.shared.TestProtocol;
 import com.android.launcher3.uioverrides.QuickstepWidgetHolder.QuickstepHolderFactory;
@@ -1089,10 +1090,12 @@
         );
     }
 
-    public void setTaskbarUIController(LauncherTaskbarUIController taskbarUIController) {
-        mTaskbarUIController = taskbarUIController;
+    @Override
+    public void setTaskbarUIController(@Nullable TaskbarUIController taskbarUIController) {
+        mTaskbarUIController = (LauncherTaskbarUIController) taskbarUIController;
     }
 
+    @Override
     public @Nullable LauncherTaskbarUIController getTaskbarUIController() {
         return mTaskbarUIController;
     }
@@ -1399,6 +1402,7 @@
     }
 
     @NonNull
+    @Override
     public TISBindHelper getTISBindHelper() {
         return mTISBindHelper;
     }
diff --git a/quickstep/src/com/android/quickstep/RecentsActivity.java b/quickstep/src/com/android/quickstep/RecentsActivity.java
index b19f651..6075294 100644
--- a/quickstep/src/com/android/quickstep/RecentsActivity.java
+++ b/quickstep/src/com/android/quickstep/RecentsActivity.java
@@ -70,6 +70,7 @@
 import com.android.launcher3.statemanager.StatefulActivity;
 import com.android.launcher3.taskbar.FallbackTaskbarUIController;
 import com.android.launcher3.taskbar.TaskbarManager;
+import com.android.launcher3.taskbar.TaskbarUIController;
 import com.android.launcher3.util.ActivityOptionsWrapper;
 import com.android.launcher3.util.ContextTracker;
 import com.android.launcher3.util.RunnableList;
@@ -115,7 +116,7 @@
     private FallbackRecentsView mFallbackRecentsView;
     private OverviewActionsView<?> mActionsView;
     private TISBindHelper mTISBindHelper;
-    private @Nullable FallbackTaskbarUIController mTaskbarUIController;
+    private @Nullable FallbackTaskbarUIController<RecentsActivity> mTaskbarUIController;
 
     private StateManager<RecentsState, RecentsActivity> mStateManager;
 
@@ -174,11 +175,14 @@
         mTISBindHelper.runOnBindToTouchInteractionService(r);
     }
 
-    public void setTaskbarUIController(FallbackTaskbarUIController taskbarUIController) {
-        mTaskbarUIController = taskbarUIController;
+    @Override
+    public void setTaskbarUIController(@Nullable TaskbarUIController taskbarUIController) {
+        mTaskbarUIController = (FallbackTaskbarUIController<RecentsActivity>) taskbarUIController;
     }
 
-    public FallbackTaskbarUIController getTaskbarUIController() {
+    @Nullable
+    @Override
+    public FallbackTaskbarUIController<RecentsActivity> getTaskbarUIController() {
         return mTaskbarUIController;
     }
 
@@ -515,6 +519,7 @@
     }
 
     @NonNull
+    @Override
     public TISBindHelper getTISBindHelper() {
         return mTISBindHelper;
     }
diff --git a/quickstep/src/com/android/quickstep/TouchInteractionService.java b/quickstep/src/com/android/quickstep/TouchInteractionService.java
index 032e755..e8f38be 100644
--- a/quickstep/src/com/android/quickstep/TouchInteractionService.java
+++ b/quickstep/src/com/android/quickstep/TouchInteractionService.java
@@ -776,10 +776,13 @@
         mAllAppsActionManager.setHomeAndOverviewSame(isHomeAndOverviewSame);
         RecentsViewContainer newOverviewContainer =
                 mOverviewComponentObserver.getContainerInterface().getCreatedContainer();
-        if (newOverviewContainer != null
-                && newOverviewContainer instanceof StatefulActivity activity) {
-            //TODO(b/368030750) refactor taskbarManager to accept RecentsViewContainer
-            mTaskbarManager.setActivity(activity);
+        if (newOverviewContainer != null) {
+            if (newOverviewContainer instanceof StatefulActivity activity) {
+                // This will also call setRecentsViewContainer() internally.
+                mTaskbarManager.setActivity(activity);
+            } else {
+                mTaskbarManager.setRecentsViewContainer(newOverviewContainer);
+            }
         }
         mTISBinder.onOverviewTargetChange();
     }
diff --git a/quickstep/src/com/android/quickstep/fallback/window/RecentsWindowManager.kt b/quickstep/src/com/android/quickstep/fallback/window/RecentsWindowManager.kt
index 74f9901..78224ae 100644
--- a/quickstep/src/com/android/quickstep/fallback/window/RecentsWindowManager.kt
+++ b/quickstep/src/com/android/quickstep/fallback/window/RecentsWindowManager.kt
@@ -40,6 +40,7 @@
 import com.android.launcher3.statemanager.StateManager
 import com.android.launcher3.statemanager.StateManager.AtomicAnimationFactory
 import com.android.launcher3.statemanager.StatefulContainer
+import com.android.launcher3.taskbar.TaskbarUIController
 import com.android.launcher3.util.ContextTracker
 import com.android.launcher3.util.DisplayController
 import com.android.launcher3.util.RunnableList
@@ -117,6 +118,7 @@
 
     private var callbacks: RecentsAnimationCallbacks? = null
 
+    private var taskbarUIController: TaskbarUIController? = null
     private var tisBindHelper: TISBindHelper = TISBindHelper(this) {}
 
     // Callback array that corresponds to events defined in @ActivityEvent
@@ -290,6 +292,18 @@
         return tisBindHelper.desktopVisibilityController
     }
 
+    override fun setTaskbarUIController(taskbarUIController: TaskbarUIController?) {
+        this.taskbarUIController = taskbarUIController
+    }
+
+    override fun getTaskbarUIController(): TaskbarUIController? {
+        return taskbarUIController
+    }
+
+    override fun getTISBindHelper(): TISBindHelper {
+        return tisBindHelper
+    }
+
     fun registerInitListener(onInitListener: Predicate<Boolean>) {
         this.onInitListener = onInitListener
     }
diff --git a/quickstep/src/com/android/quickstep/views/RecentsViewContainer.java b/quickstep/src/com/android/quickstep/views/RecentsViewContainer.java
index d8036aa..b04753b 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsViewContainer.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsViewContainer.java
@@ -16,8 +16,6 @@
 
 package com.android.quickstep.views;
 
-import android.app.Activity;
-import android.content.ComponentName;
 import android.content.Context;
 import android.content.ContextWrapper;
 import android.content.LocusId;
@@ -27,13 +25,16 @@
 import android.view.View;
 import android.view.Window;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.android.launcher3.BaseActivity;
 import com.android.launcher3.logger.LauncherAtom;
 import com.android.launcher3.statehandlers.DesktopVisibilityController;
+import com.android.launcher3.taskbar.TaskbarUIController;
 import com.android.launcher3.views.ActivityContext;
 import com.android.launcher3.views.ScrimView;
+import com.android.quickstep.util.TISBindHelper;
 
 /**
  * Interface to be implemented by the parent view of RecentsView
@@ -212,4 +213,10 @@
 
     @Nullable
     DesktopVisibilityController getDesktopVisibilityController();
+
+    void setTaskbarUIController(@Nullable TaskbarUIController taskbarUIController);
+
+    @Nullable TaskbarUIController getTaskbarUIController();
+
+    @NonNull TISBindHelper getTISBindHelper();
 }
diff --git a/quickstep/tests/src/com/android/launcher3/taskbar/FallbackTaskbarUIControllerTest.kt b/quickstep/tests/src/com/android/launcher3/taskbar/FallbackTaskbarUIControllerTest.kt
index 04012c0..df98606 100644
--- a/quickstep/tests/src/com/android/launcher3/taskbar/FallbackTaskbarUIControllerTest.kt
+++ b/quickstep/tests/src/com/android/launcher3/taskbar/FallbackTaskbarUIControllerTest.kt
@@ -33,7 +33,7 @@
 @RunWith(AndroidJUnit4::class)
 class FallbackTaskbarUIControllerTest : TaskbarBaseTestCase() {
 
-    lateinit var fallbackTaskbarUIController: FallbackTaskbarUIController
+    lateinit var fallbackTaskbarUIController: FallbackTaskbarUIController<RecentsActivity>
     lateinit var stateListener: StateManager.StateListener<RecentsState>
 
     private val recentsActivity: RecentsActivity = mock()